I2C problem LPC1768

lpcware — Wed, 15 Jun 2016 17:26:39 GMT

Content originally posted in LPCWare by muratgny on Thu Aug 08 13:39:22 MST 2013
I am trying to read data via I2C0 from SDP600 pressure sensor using the codes below. My demo board is om11032 (lpc1768 cortex m3), the compiler is uvison 4,operating system is win7. My problem is, I can not read any data from the sensor besides on the oscilloscope none of the sda and scl lines are active. I am sure the sensor and the oscilloscope are working properly but no signals appears on the ports (p0.27 sda p0.28 scl)(pull-ups are done,the address of the sensor is 64). If anyone help me I would really appreciate.

/****************************************************************************
 *   $Id:: i2cmst.c 6097 2011-01-07 04:31:25Z nxp12832                      $
 *   Project: NXP LPC17xx I2C example
 *
 *   Description:
 *     This file contains I2C test modules, main entry, to test I2C APIs.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#include "lpc17xx.h"
#include "type.h"
#include "i2c.h"

extern volatile uint8_t I2CMasterBuffer[I2C_PORT_NUM][BUFSIZE];
extern volatile uint8_t I2CSlaveBuffer[I2C_PORT_NUM][BUFSIZE];
extern volatile uint32_t I2CReadLength[I2C_PORT_NUM];
extern volatile uint32_t I2CWriteLength[I2C_PORT_NUM];

#define PORT_USED0

/*******************************************************************************
**   Main Function  main()
*******************************************************************************/
int main (void)
{


  /* SystemClockUpdate() updates the SystemFrequency variable */

  SystemClockUpdate();

  I2C0Init( );/* initialize I2c0 */





I2C2Init () ;
I2CReadLength [PORT_USED] = 1;
I2CWriteLength [PORT_USED] = 2;
I2CMasterBuffer [PORT_USED] [0] = PCF8594_ADDR;
I2CMasterBuffer [PORT_USED] [1] = 0xFF;
I2CMasterBuffer [PORT_USED] [2] = PCF8594_ADDR | RD_BIT;

while (1) {

I2CEngine (PORT_USED);




}

}

/******************************************************************************
**                            End Of File
******************************************************************************/

 /******************************************************************************
 * @file:    core_cm3.h
 * @purpose: CMSIS Cortex-M3 Core Peripheral Access Layer Header File
 * @version: V1.20
 * @date:    22. May 2009
 *----------------------------------------------------------------------------
 *
 * Copyright (C) 2009 ARM Limited. All rights reserved.
 *
 * ARM Limited (ARM) is supplying this software for use with Cortex-Mx 
 * processor based microcontrollers.  This file can be freely distributed 
 * within development tools that are supporting such ARM based processors. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 ******************************************************************************/

#ifndef __CM3_CORE_H__
#define __CM3_CORE_H__

#ifdef __cplusplus
 extern "C" {
#endif 

#define __CM3_CMSIS_VERSION_MAIN  (0x01)                                                       /*!< [31:16] CMSIS HAL main version */
#define __CM3_CMSIS_VERSION_SUB   (0x20)                                                       /*!< [15:0]  CMSIS HAL sub version  */
#define __CM3_CMSIS_VERSION       ((__CM3_CMSIS_VERSION_MAIN << 16) | __CM3_CMSIS_VERSION_SUB) /*!< CMSIS HAL version number       */

#define __CORTEX_M                (0x03)                                                       /*!< Cortex core                    */

/**
 *  Lint configuration \n
 *  ----------------------- \n
 *
 *  The following Lint messages will be suppressed and not shown: \n
 *  \n
 *    --- Error 10: --- \n
 *    register uint32_t __regBasePri         __asm("basepri"); \n
 *    Error 10: Expecting ';' \n
 *     \n
 *    --- Error 530: --- \n
 *    return(__regBasePri); \n
 *    Warning 530: Symbol '__regBasePri' (line 264) not initialized \n
 *     \n
 *    --- Error 550: --- \n
 *      __regBasePri = (basePri & 0x1ff); \n
 *    } \n
 *    Warning 550: Symbol '__regBasePri' (line 271) not accessed \n
 *     \n
 *    --- Error 754: --- \n
 *    uint32_t RESERVED0[24]; \n
 *    Info 754: local structure member '<some, not used in the HAL>' (line 109, file ./cm3_core.h) not referenced \n
 *     \n
 *    --- Error 750: --- \n
 *    #define __CM3_CORE_H__ \n
 *    Info 750: local macro '__CM3_CORE_H__' (line 43, file./cm3_core.h) not referenced \n
 *     \n
 *    --- Error 528: --- \n
 *    static __INLINE void NVIC_DisableIRQ(uint32_t IRQn) \n
 *    Warning 528: Symbol 'NVIC_DisableIRQ(unsigned int)' (line 419, file ./cm3_core.h) not referenced \n
 *     \n
 *    --- Error 751: --- \n
 *    } InterruptType_Type; \n
 *    Info 751: local typedef 'InterruptType_Type' (line 170, file ./cm3_core.h) not referenced \n
 * \n
 * \n
 *    Note:  To re-enable a Message, insert a space before 'lint' * \n
 *
 */

/*lint -save */
/*lint -e10  */
/*lint -e530 */
/*lint -e550 */
/*lint -e754 */
/*lint -e750 */
/*lint -e528 */
/*lint -e751 */


#include <stdint.h>                           /* Include standard types */

#if defined (__ICCARM__)
  #include <intrinsics.h>                     /* IAR Intrinsics   */
#endif


#ifndef __NVIC_PRIO_BITS
  #define __NVIC_PRIO_BITS    4               /*!< standard definition for NVIC Priority Bits */
#endif




/**
 * IO definitions
 *
 * define access restrictions to peripheral registers
 */

#ifdef __cplusplus
#define     __I     volatile                  /*!< defines 'read only' permissions      */
#else
#define     __I     volatile const            /*!< defines 'read only' permissions      */
#endif
#define     __O     volatile                  /*!< defines 'write only' permissions     */
#define     __IO    volatile                  /*!< defines 'read / write' permissions   */



/*******************************************************************************
 *                 Register Abstraction
 ******************************************************************************/


/* System Reset */
#define NVIC_VECTRESET              0         /*!< Vector Reset Bit             */
#define NVIC_SYSRESETREQ            2         /*!< System Reset Request         */
#define NVIC_AIRCR_VECTKEY    (0x5FA << 16)   /*!< AIRCR Key for write access   */
#define NVIC_AIRCR_ENDIANESS        15        /*!< Endianess                    */

/* Core Debug */
#define CoreDebug_DEMCR_TRCENA (1 << 24)      /*!< DEMCR TRCENA enable          */
#define ITM_TCR_ITMENA              1         /*!< ITM enable                   */




/* memory mapping struct for Nested Vectored Interrupt Controller (NVIC) */
typedef struct
{
  __IO uint32_t ISER[8];                      /*!< Interrupt Set Enable Register            */
       uint32_t RESERVED0[24];
  __IO uint32_t ICER[8];                      /*!< Interrupt Clear Enable Register          */
       uint32_t RSERVED1[24];
  __IO uint32_t ISPR[8];                      /*!< Interrupt Set Pending Register           */
       uint32_t RESERVED2[24];
  __IO uint32_t ICPR[8];                      /*!< Interrupt Clear Pending Register         */
       uint32_t RESERVED3[24];
  __IO uint32_t IABR[8];                      /*!< Interrupt Active bit Register            */
       uint32_t RESERVED4[56];
  __IO uint8_t  IP[240];                      /*!< Interrupt Priority Register, 8Bit wide   */
       uint32_t RESERVED5[644];
  __O  uint32_t STIR;                         /*!< Software Trigger Interrupt Register      */
}  NVIC_Type;


/* memory mapping struct for System Control Block */
typedef struct
{
  __I  uint32_t CPUID;                        /*!< CPU ID Base Register                                     */
  __IO uint32_t ICSR;                         /*!< Interrupt Control State Register                         */
  __IO uint32_t VTOR;                         /*!< Vector Table Offset Register                             */
  __IO uint32_t AIRCR;                        /*!< Application Interrupt / Reset Control Register           */
  __IO uint32_t SCR;                          /*!< System Control Register                                  */
  __IO uint32_t CCR;                          /*!< Configuration Control Register                           */
  __IO uint8_t  SHP[12];                      /*!< System Handlers Priority Registers (4-7, 8-11, 12-15)    */
  __IO uint32_t SHCSR;                        /*!< System Handler Control and State Register                */
  __IO uint32_t CFSR;                         /*!< Configurable Fault Status Register                       */
  __IO uint32_t HFSR;                         /*!< Hard Fault Status Register                               */
  __IO uint32_t DFSR;                         /*!< Debug Fault Status Register                              */
  __IO uint32_t MMFAR;                        /*!< Mem Manage Address Register                              */
  __IO uint32_t BFAR;                         /*!< Bus Fault Address Register                               */
  __IO uint32_t AFSR;                         /*!< Auxiliary Fault Status Register                          */
  __I  uint32_t PFR[2];                       /*!< Processor Feature Register                               */
  __I  uint32_t DFR;                          /*!< Debug Feature Register                                   */
  __I  uint32_t ADR;                          /*!< Auxiliary Feature Register                               */
  __I  uint32_t MMFR[4];                      /*!< Memory Model Feature Register                            */
  __I  uint32_t ISAR[5];                      /*!< ISA Feature Register                                     */
} SCB_Type;


/* memory mapping struct for SysTick */
typedef struct
{
  __IO uint32_t CTRL;                         /*!< SysTick Control and Status Register */
  __IO uint32_t LOAD;                         /*!< SysTick Reload Value Register       */
  __IO uint32_t VAL;                          /*!< SysTick Current Value Register      */
  __I  uint32_t CALIB;                        /*!< SysTick Calibration Register        */
} SysTick_Type;


/* memory mapping structur for ITM */
typedef struct
{
  __O  union  
  {
    __O  uint8_t    u8;                       /*!< ITM Stimulus Port 8-bit               */
    __O  uint16_t   u16;                      /*!< ITM Stimulus Port 16-bit              */
    __O  uint32_t   u32;                      /*!< ITM Stimulus Port 32-bit              */
  }  PORT [32];                               /*!< ITM Stimulus Port Registers           */
       uint32_t RESERVED0[864];
  __IO uint32_t TER;                          /*!< ITM Trace Enable Register             */
       uint32_t RESERVED1[15];
  __IO uint32_t TPR;                          /*!< ITM Trace Privilege Register          */
       uint32_t RESERVED2[15];
  __IO uint32_t TCR;                          /*!< ITM Trace Control Register            */
       uint32_t RESERVED3[29];
  __IO uint32_t IWR;                          /*!< ITM Integration Write Register        */
  __IO uint32_t IRR;                          /*!< ITM Integration Read Register         */
  __IO uint32_t IMCR;                         /*!< ITM Integration Mode Control Register */
       uint32_t RESERVED4[43];
  __IO uint32_t LAR;                          /*!< ITM Lock Access Register              */
  __IO uint32_t LSR;                          /*!< ITM Lock Status Register              */
       uint32_t RESERVED5[6];
  __I  uint32_t PID4;                         /*!< ITM Product ID Registers              */
  __I  uint32_t PID5;
  __I  uint32_t PID6;
  __I  uint32_t PID7;
  __I  uint32_t PID0;
  __I  uint32_t PID1;
  __I  uint32_t PID2;
  __I  uint32_t PID3;
  __I  uint32_t CID0;
  __I  uint32_t CID1;
  __I  uint32_t CID2;
  __I  uint32_t CID3;
} ITM_Type;


/* memory mapped struct for Interrupt Type */
typedef struct
{
       uint32_t RESERVED0;
  __I  uint32_t ICTR;                         /*!< Interrupt Control Type Register  */
#if ((defined __CM3_REV) && (__CM3_REV >= 0x200))
  __IO uint32_t ACTLR;                        /*!< Auxiliary Control Register       */
#else
       uint32_t RESERVED1;
#endif
} InterruptType_Type;


/* Memory Protection Unit */
#if defined (__MPU_PRESENT) && (__MPU_PRESENT == 1)
typedef struct
{
  __I  uint32_t TYPE;                         /*!< MPU Type Register                               */
  __IO uint32_t CTRL;                         /*!< MPU Control Register                            */
  __IO uint32_t RNR;                          /*!< MPU Region RNRber Register                      */
  __IO uint32_t RBAR;                         /*!< MPU Region Base Address Register                */
  __IO uint32_t RASR;                         /*!< MPU Region Attribute and Size Register          */
  __IO uint32_t RBAR_A1;                      /*!< MPU Alias 1 Region Base Address Register        */
  __IO uint32_t RASR_A1;                      /*!< MPU Alias 1 Region Attribute and Size Register  */
  __IO uint32_t RBAR_A2;                      /*!< MPU Alias 2 Region Base Address Register        */
  __IO uint32_t RASR_A2;                      /*!< MPU Alias 2 Region Attribute and Size Register  */
  __IO uint32_t RBAR_A3;                      /*!< MPU Alias 3 Region Base Address Register        */
  __IO uint32_t RASR_A3;                      /*!< MPU Alias 3 Region Attribute and Size Register  */
} MPU_Type;
#endif


/* Core Debug Register */
typedef struct
{
  __IO uint32_t DHCSR;                        /*!< Debug Halting Control and Status Register       */
  __O  uint32_t DCRSR;                        /*!< Debug Core Register Selector Register           */
  __IO uint32_t DCRDR;                        /*!< Debug Core Register Data Register               */
  __IO uint32_t DEMCR;                        /*!< Debug Exception and Monitor Control Register    */
} CoreDebug_Type;


/* Memory mapping of Cortex-M3 Hardware */
#define SCS_BASE            (0xE000E000)                              /*!< System Control Space Base Address    */
#define ITM_BASE            (0xE0000000)                              /*!< ITM Base Address                     */
#define CoreDebug_BASE      (0xE000EDF0)                              /*!< Core Debug Base Address              */
#define SysTick_BASE        (SCS_BASE +  0x0010)                      /*!< SysTick Base Address                 */
#define NVIC_BASE           (SCS_BASE +  0x0100)                      /*!< NVIC Base Address                    */
#define SCB_BASE            (SCS_BASE +  0x0D00)                      /*!< System Control Block Base Address    */

#define InterruptType       ((InterruptType_Type *) SCS_BASE)         /*!< Interrupt Type Register              */
#define SCB                 ((SCB_Type *)           SCB_BASE)         /*!< SCB configuration struct             */
#define SysTick             ((SysTick_Type *)       SysTick_BASE)     /*!< SysTick configuration struct         */
#define NVIC                ((NVIC_Type *)          NVIC_BASE)        /*!< NVIC configuration struct            */
#define ITM                 ((ITM_Type *)           ITM_BASE)         /*!< ITM configuration struct             */
#define CoreDebug           ((CoreDebug_Type *)     CoreDebug_BASE)   /*!< Core Debug configuration struct      */

#if defined (__MPU_PRESENT) && (__MPU_PRESENT == 1)
  #define MPU_BASE          (SCS_BASE +  0x0D90)                      /*!< Memory Protection Unit               */
  #define MPU               ((MPU_Type*)            MPU_BASE)         /*!< Memory Protection Unit               */
#endif



/*******************************************************************************
 *                Hardware Abstraction Layer
 ******************************************************************************/


#if defined ( __CC_ARM   )
  #define __ASM            __asm                                      /*!< asm keyword for ARM Compiler          */
  #define __INLINE         __inline                                   /*!< inline keyword for ARM Compiler       */

#elif defined ( __ICCARM__ )
  #define __ASM           __asm                                       /*!< asm keyword for IAR Compiler           */
  #define __INLINE        inline                                      /*!< inline keyword for IAR Compiler. Only avaiable in High optimization mode! */

#elif defined   (  __GNUC__  )
  #define __ASM            __asm                                      /*!< asm keyword for GNU Compiler          */
  #define __INLINE         inline                                     /*!< inline keyword for GNU Compiler       */

#elif defined   (  __TASKING__  )
  #define __ASM            __asm                                      /*!< asm keyword for TASKING Compiler          */
  #define __INLINE         inline                                     /*!< inline keyword for TASKING Compiler       */

#endif


/* ###################  Compiler specific Intrinsics  ########################### */

#if defined ( __CC_ARM   ) /*------------------RealView Compiler -----------------*/
/* ARM armcc specific functions */

#define __enable_fault_irq                __enable_fiq
#define __disable_fault_irq               __disable_fiq

#define __NOP                             __nop
#define __WFI                             __wfi
#define __WFE                             __wfe
#define __SEV                             __sev
#define __ISB()                           __isb(0)
#define __DSB()                           __dsb(0)
#define __DMB()                           __dmb(0)
#define __REV                             __rev
#define __RBIT                            __rbit
#define __LDREXB(ptr)                     ((unsigned char ) __ldrex(ptr))
#define __LDREXH(ptr)                     ((unsigned short) __ldrex(ptr))
#define __LDREXW(ptr)                     ((unsigned int  ) __ldrex(ptr))
#define __STREXB(value, ptr)              __strex(value, ptr)
#define __STREXH(value, ptr)              __strex(value, ptr)
#define __STREXW(value, ptr)              __strex(value, ptr)


/* intrinsic unsigned long long __ldrexd(volatile void *ptr) */
/* intrinsic int __strexd(unsigned long long val, volatile void *ptr) */
/* intrinsic void __enable_irq();     */
/* intrinsic void __disable_irq();    */


/**
 * @brief  Return the Process Stack Pointer
 *
 * @param  none
 * @return uint32_t ProcessStackPointer
 *
 * Return the actual process stack pointer
 */
extern uint32_t __get_PSP(void);

/**
 * @brief  Set the Process Stack Pointer
 *
 * @param  uint32_t Process Stack Pointer
 * @return none
 *
 * Assign the value ProcessStackPointer to the MSP 
 * (process stack pointer) Cortex processor register
 */
extern void __set_PSP(uint32_t topOfProcStack);

/**
 * @brief  Return the Main Stack Pointer
 *
 * @param  none
 * @return uint32_t Main Stack Pointer
 *
 * Return the current value of the MSP (main stack pointer)
 * Cortex processor register
 */
extern uint32_t __get_MSP(void);

/**
 * @brief  Set the Main Stack Pointer
 *
 * @param  uint32_t Main Stack Pointer
 * @return none
 *
 * Assign the value mainStackPointer to the MSP 
 * (main stack pointer) Cortex processor register
 */
extern void __set_MSP(uint32_t topOfMainStack);

/**
 * @brief  Reverse byte order in unsigned short value
 *
 * @param  uint16_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse byte order in unsigned short value
 */
extern uint32_t __REV16(uint16_t value);

/*
 * @brief  Reverse byte order in signed short value with sign extension to integer
 *
 * @param  int16_t value to reverse
 * @return int32_t reversed value
 *
 * Reverse byte order in signed short value with sign extension to integer
 */
extern int32_t __REVSH(int16_t value);


#if (__ARMCC_VERSION < 400000)

/**
 * @brief  Remove the exclusive lock created by ldrex
 *
 * @param  none
 * @return none
 *
 * Removes the exclusive lock which is created by ldrex.
 */
extern void __CLREX(void);

/**
 * @brief  Return the Base Priority value
 *
 * @param  none
 * @return uint32_t BasePriority
 *
 * Return the content of the base priority register
 */
extern uint32_t __get_BASEPRI(void);

/**
 * @brief  Set the Base Priority value
 *
 * @param  uint32_t BasePriority
 * @return none
 *
 * Set the base priority register
 */
extern void __set_BASEPRI(uint32_t basePri);

/**
 * @brief  Return the Priority Mask value
 *
 * @param  none
 * @return uint32_t PriMask
 *
 * Return the state of the priority mask bit from the priority mask
 * register
 */
extern uint32_t __get_PRIMASK(void);

/**
 * @brief  Set the Priority Mask value
 *
 * @param  uint32_t PriMask
 * @return none
 *
 * Set the priority mask bit in the priority mask register
 */
extern void __set_PRIMASK(uint32_t priMask);

/**
 * @brief  Return the Fault Mask value
 *
 * @param  none
 * @return uint32_t FaultMask
 *
 * Return the content of the fault mask register
 */
extern uint32_t __get_FAULTMASK(void);

/**
 * @brief  Set the Fault Mask value
 *
 * @param  uint32_t faultMask value
 * @return none
 *
 * Set the fault mask register
 */
extern void __set_FAULTMASK(uint32_t faultMask);

/**
 * @brief  Return the Control Register value
 * 
 * @param  none
 * @return uint32_t Control value
 *
 * Return the content of the control register
 */
extern uint32_t __get_CONTROL(void);

/**
 * @brief  Set the Control Register value
 *
 * @param  uint32_t Control value
 * @return none
 *
 * Set the control register
 */
extern void __set_CONTROL(uint32_t control);

#else  /* (__ARMCC_VERSION >= 400000)  */


/**
 * @brief  Remove the exclusive lock created by ldrex
 *
 * @param  none
 * @return none
 *
 * Removes the exclusive lock which is created by ldrex.
 */
#define __CLREX                           __clrex

/**
 * @brief  Return the Base Priority value
 *
 * @param  none
 * @return uint32_t BasePriority
 *
 * Return the content of the base priority register
 */
static __INLINE uint32_t  __get_BASEPRI(void)
{
  register uint32_t __regBasePri         __ASM("basepri");
  return(__regBasePri);
}

/**
 * @brief  Set the Base Priority value
 *
 * @param  uint32_t BasePriority
 * @return none
 *
 * Set the base priority register
 */
static __INLINE void __set_BASEPRI(uint32_t basePri)
{
  register uint32_t __regBasePri         __ASM("basepri");
  __regBasePri = (basePri & 0x1ff);
}

/**
 * @brief  Return the Priority Mask value
 *
 * @param  none
 * @return uint32_t PriMask
 *
 * Return the state of the priority mask bit from the priority mask
 * register
 */
static __INLINE uint32_t __get_PRIMASK(void)
{
  register uint32_t __regPriMask         __ASM("primask");
  return(__regPriMask);
}

/**
 * @brief  Set the Priority Mask value
 *
 * @param  uint32_t PriMask
 * @return none
 *
 * Set the priority mask bit in the priority mask register
 */
static __INLINE void __set_PRIMASK(uint32_t priMask)
{
  register uint32_t __regPriMask         __ASM("primask");
  __regPriMask = (priMask);
}

/**
 * @brief  Return the Fault Mask value
 *
 * @param  none
 * @return uint32_t FaultMask
 *
 * Return the content of the fault mask register
 */
static __INLINE uint32_t __get_FAULTMASK(void)
{
  register uint32_t __regFaultMask       __ASM("faultmask");
  return(__regFaultMask);
}

/**
 * @brief  Set the Fault Mask value
 *
 * @param  uint32_t faultMask value
 * @return none
 *
 * Set the fault mask register
 */
static __INLINE void __set_FAULTMASK(uint32_t faultMask)
{
  register uint32_t __regFaultMask       __ASM("faultmask");
  __regFaultMask = (faultMask & 1);
}

/**
 * @brief  Return the Control Register value
 * 
 * @param  none
 * @return uint32_t Control value
 *
 * Return the content of the control register
 */
static __INLINE uint32_t __get_CONTROL(void)
{
  register uint32_t __regControl         __ASM("control");
  return(__regControl);
}

/**
 * @brief  Set the Control Register value
 *
 * @param  uint32_t Control value
 * @return none
 *
 * Set the control register
 */
static __INLINE void __set_CONTROL(uint32_t control)
{
  register uint32_t __regControl         __ASM("control");
  __regControl = control;
}

#endif /* __ARMCC_VERSION  */ 



#elif (defined (__ICCARM__)) /*------------------ ICC Compiler -------------------*/
/* IAR iccarm specific functions */

#define __enable_irq                              __enable_interrupt        /*!< global Interrupt enable */
#define __disable_irq                             __disable_interrupt       /*!< global Interrupt disable */

static __INLINE void __enable_fault_irq()         { __ASM ("cpsie f"); }
static __INLINE void __disable_fault_irq()        { __ASM ("cpsid f"); }

#define __NOP                                     __no_operation()          /*!< no operation intrinsic in IAR Compiler */ 
static __INLINE  void __WFI()                     { __ASM ("wfi"); }
static __INLINE  void __WFE()                     { __ASM ("wfe"); }
static __INLINE  void __SEV()                     { __ASM ("sev"); }
static __INLINE  void __CLREX()                   { __ASM ("clrex"); }

/* intrinsic void __ISB(void)                                     */
/* intrinsic void __DSB(void)                                     */
/* intrinsic void __DMB(void)                                     */
/* intrinsic void __set_PRIMASK();                                */
/* intrinsic void __get_PRIMASK();                                */
/* intrinsic void __set_FAULTMASK();                              */
/* intrinsic void __get_FAULTMASK();                              */
/* intrinsic uint32_t __REV(uint32_t value);                      */
/* intrinsic uint32_t __REVSH(uint32_t value);                    */
/* intrinsic unsigned long __STREX(unsigned long, unsigned long); */
/* intrinsic unsigned long __LDREX(unsigned long *);              */


/**
 * @brief  Return the Process Stack Pointer
 *
 * @param  none
 * @return uint32_t ProcessStackPointer
 *
 * Return the actual process stack pointer
 */
extern uint32_t __get_PSP(void);

/**
 * @brief  Set the Process Stack Pointer
 *
 * @param  uint32_t Process Stack Pointer
 * @return none
 *
 * Assign the value ProcessStackPointer to the MSP 
 * (process stack pointer) Cortex processor register
 */
extern void __set_PSP(uint32_t topOfProcStack);

/**
 * @brief  Return the Main Stack Pointer
 *
 * @param  none
 * @return uint32_t Main Stack Pointer
 *
 * Return the current value of the MSP (main stack pointer)
 * Cortex processor register
 */
extern uint32_t __get_MSP(void);

/**
 * @brief  Set the Main Stack Pointer
 *
 * @param  uint32_t Main Stack Pointer
 * @return none
 *
 * Assign the value mainStackPointer to the MSP 
 * (main stack pointer) Cortex processor register
 */
extern void __set_MSP(uint32_t topOfMainStack);

/**
 * @brief  Reverse byte order in unsigned short value
 *
 * @param  uint16_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse byte order in unsigned short value
 */
extern uint32_t __REV16(uint16_t value);

/**
 * @brief  Reverse bit order of value
 *
 * @param  uint32_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse bit order of value
 */
extern uint32_t __RBIT(uint32_t value);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint8_t* address
 * @return uint8_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint8_t __LDREXB(uint8_t *addr);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint16_t* address
 * @return uint16_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint16_t __LDREXH(uint16_t *addr);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint32_t* address
 * @return uint32_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint32_t __LDREXW(uint32_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint8_t *address
 * @param  uint8_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXB(uint8_t value, uint8_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint16_t *address
 * @param  uint16_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXH(uint16_t value, uint16_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint32_t *address
 * @param  uint32_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXW(uint32_t value, uint32_t *addr);



#elif (defined (__GNUC__)) /*------------------ GNU Compiler ---------------------*/
/* GNU gcc specific functions */

static __INLINE void __enable_irq()               { __ASM volatile ("cpsie i"); }
static __INLINE void __disable_irq()              { __ASM volatile ("cpsid i"); }

static __INLINE void __enable_fault_irq()         { __ASM volatile ("cpsie f"); }
static __INLINE void __disable_fault_irq()        { __ASM volatile ("cpsid f"); }

static __INLINE void __NOP()                      { __ASM volatile ("nop"); }
static __INLINE void __WFI()                      { __ASM volatile ("wfi"); }
static __INLINE void __WFE()                      { __ASM volatile ("wfe"); }
static __INLINE void __SEV()                      { __ASM volatile ("sev"); }
static __INLINE void __ISB()                      { __ASM volatile ("isb"); }
static __INLINE void __DSB()                      { __ASM volatile ("dsb"); }
static __INLINE void __DMB()                      { __ASM volatile ("dmb"); }
static __INLINE void __CLREX()                    { __ASM volatile ("clrex"); }


/**
 * @brief  Return the Process Stack Pointer
 *
 * @param  none
 * @return uint32_t ProcessStackPointer
 *
 * Return the actual process stack pointer
 */
extern uint32_t __get_PSP(void);

/**
 * @brief  Set the Process Stack Pointer
 *
 * @param  uint32_t Process Stack Pointer
 * @return none
 *
 * Assign the value ProcessStackPointer to the MSP 
 * (process stack pointer) Cortex processor register
 */
extern void __set_PSP(uint32_t topOfProcStack);

/**
 * @brief  Return the Main Stack Pointer
 *
 * @param  none
 * @return uint32_t Main Stack Pointer
 *
 * Return the current value of the MSP (main stack pointer)
 * Cortex processor register
 */
extern uint32_t __get_MSP(void);

/**
 * @brief  Set the Main Stack Pointer
 *
 * @param  uint32_t Main Stack Pointer
 * @return none
 *
 * Assign the value mainStackPointer to the MSP 
 * (main stack pointer) Cortex processor register
 */
extern void __set_MSP(uint32_t topOfMainStack);

/**
 * @brief  Return the Base Priority value
 *
 * @param  none
 * @return uint32_t BasePriority
 *
 * Return the content of the base priority register
 */
extern uint32_t __get_BASEPRI(void);

/**
 * @brief  Set the Base Priority value
 *
 * @param  uint32_t BasePriority
 * @return none
 *
 * Set the base priority register
 */
extern void __set_BASEPRI(uint32_t basePri);

/**
 * @brief  Return the Priority Mask value
 *
 * @param  none
 * @return uint32_t PriMask
 *
 * Return the state of the priority mask bit from the priority mask
 * register
 */
extern uint32_t  __get_PRIMASK(void);

/**
 * @brief  Set the Priority Mask value
 *
 * @param  uint32_t PriMask
 * @return none
 *
 * Set the priority mask bit in the priority mask register
 */
extern void __set_PRIMASK(uint32_t priMask);

/**
 * @brief  Return the Fault Mask value
 *
 * @param  none
 * @return uint32_t FaultMask
 *
 * Return the content of the fault mask register
 */
extern uint32_t __get_FAULTMASK(void);

/**
 * @brief  Set the Fault Mask value
 *
 * @param  uint32_t faultMask value
 * @return none
 *
 * Set the fault mask register
 */
extern void __set_FAULTMASK(uint32_t faultMask);

/**
 * @brief  Return the Control Register value
* 
*  @param  none
*  @return uint32_t Control value
 *
 * Return the content of the control register
 */
extern uint32_t __get_CONTROL(void);

/**
 * @brief  Set the Control Register value
 *
 * @param  uint32_t Control value
 * @return none
 *
 * Set the control register
 */
extern void __set_CONTROL(uint32_t control);

/**
 * @brief  Reverse byte order in integer value
 *
 * @param  uint32_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse byte order in integer value
 */
extern uint32_t __REV(uint32_t value);

/**
 * @brief  Reverse byte order in unsigned short value
 *
 * @param  uint16_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse byte order in unsigned short value
 */
extern uint32_t __REV16(uint16_t value);

/*
 * Reverse byte order in signed short value with sign extension to integer
 *
 * @param  int16_t value to reverse
 * @return int32_t reversed value
 *
 * @brief  Reverse byte order in signed short value with sign extension to integer
 */
extern int32_t __REVSH(int16_t value);

/**
 * @brief  Reverse bit order of value
 *
 * @param  uint32_t value to reverse
 * @return uint32_t reversed value
 *
 * Reverse bit order of value
 */
extern uint32_t __RBIT(uint32_t value);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint8_t* address
 * @return uint8_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint8_t __LDREXB(uint8_t *addr);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint16_t* address
 * @return uint16_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint16_t __LDREXH(uint16_t *addr);

/**
 * @brief  LDR Exclusive
 *
 * @param  uint32_t* address
 * @return uint32_t value of (*address)
 *
 * Exclusive LDR command
 */
extern uint32_t __LDREXW(uint32_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint8_t *address
 * @param  uint8_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXB(uint8_t value, uint8_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint16_t *address
 * @param  uint16_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXH(uint16_t value, uint16_t *addr);

/**
 * @brief  STR Exclusive
 *
 * @param  uint32_t *address
 * @param  uint32_t value to store
 * @return uint32_t successful / failed
 *
 * Exclusive STR command
 */
extern uint32_t __STREXW(uint32_t value, uint32_t *addr);


#elif (defined (__TASKING__)) /*------------------ TASKING Compiler ---------------------*/
/* TASKING carm specific functions */

/*
 * The CMSIS functions have been implemented as intrinsics in the compiler.
 * Please use "carm -?i" to get an up to date list of all instrinsics,
 * Including the CMSIS ones.
 */

#endif



/* ##########################   NVIC functions  #################################### */


/**
 * @brief  Set the Priority Grouping in NVIC Interrupt Controller
 *
 * @param  uint32_t priority_grouping is priority grouping field
 * @return none 
 *
 * Set the priority grouping field using the required unlock sequence.
 * The parameter priority_grouping is assigned to the field 
 * SCB->AIRCR [10:8] PRIGROUP field. Only values from 0..7 are used.
 * In case of a conflict between priority grouping and available
 * priority bits (__NVIC_PRIO_BITS) the smallest possible priority group is set.
 */
static __INLINE void NVIC_SetPriorityGrouping(uint32_t PriorityGroup)
{
  uint32_t reg_value;
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);                         /* only values 0..7 are used          */
  
  reg_value  = SCB->AIRCR;                                                    /* read old register configuration    */
  reg_value &= ~((0xFFFFU << 16) | (0x0F << 8));                              /* clear bits to change               */
  reg_value  = ((reg_value | NVIC_AIRCR_VECTKEY | (PriorityGroupTmp << 8)));  /* Insert write key and priorty group */
  SCB->AIRCR = reg_value;
}

/**
 * @brief  Get the Priority Grouping from NVIC Interrupt Controller
 *
 * @param  none
 * @return uint32_t   priority grouping field 
 *
 * Get the priority grouping from NVIC Interrupt Controller.
 * priority grouping is SCB->AIRCR [10:8] PRIGROUP field.
 */
static __INLINE uint32_t NVIC_GetPriorityGrouping(void)
{
  return ((SCB->AIRCR >> 8) & 0x07);                                          /* read priority grouping field */
}

/**
 * @brief  Enable Interrupt in NVIC Interrupt Controller
 *
 * @param  IRQn_Type IRQn specifies the interrupt number
 * @return none 
 *
 * Enable a device specific interupt in the NVIC interrupt controller.
 * The interrupt number cannot be a negative value.
 */
static __INLINE void NVIC_EnableIRQ(IRQn_Type IRQn)
{
  NVIC->ISER[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* enable interrupt */
}

/**
 * @brief  Disable the interrupt line for external interrupt specified
 * 
 * @param  IRQn_Type IRQn is the positive number of the external interrupt
 * @return none
 * 
 * Disable a device specific interupt in the NVIC interrupt controller.
 * The interrupt number cannot be a negative value.
 */
static __INLINE void NVIC_DisableIRQ(IRQn_Type IRQn)
{
  NVIC->ICER[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* disable interrupt */
}

/**
 * @brief  Read the interrupt pending bit for a device specific interrupt source
 * 
 * @param  IRQn_Type IRQn is the number of the device specifc interrupt
 * @return uint32_t 1 if pending interrupt else 0
 *
 * Read the pending register in NVIC and return 1 if its status is pending, 
 * otherwise it returns 0
 */
static __INLINE uint32_t NVIC_GetPendingIRQ(IRQn_Type IRQn)
{
  return((uint32_t) ((NVIC->ISPR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0)); /* Return 1 if pending else 0 */
}

/**
 * @brief  Set the pending bit for an external interrupt
 * 
 * @param  IRQn_Type IRQn is the Number of the interrupt
 * @return none
 *
 * Set the pending bit for the specified interrupt.
 * The interrupt number cannot be a negative value.
 */
static __INLINE void NVIC_SetPendingIRQ(IRQn_Type IRQn)
{
  NVIC->ISPR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* set interrupt pending */
}

/**
 * @brief  Clear the pending bit for an external interrupt
 *
 * @param  IRQn_Type IRQn is the Number of the interrupt
 * @return none
 *
 * Clear the pending bit for the specified interrupt. 
 * The interrupt number cannot be a negative value.
 */
static __INLINE void NVIC_ClearPendingIRQ(IRQn_Type IRQn)
{
  NVIC->ICPR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* Clear pending interrupt */
}

/**
 * @brief  Read the active bit for an external interrupt
 *
 * @param  IRQn_Type  IRQn is the Number of the interrupt
 * @return uint32_t   1 if active else 0
 *
 * Read the active register in NVIC and returns 1 if its status is active, 
 * otherwise it returns 0.
 */
static __INLINE uint32_t NVIC_GetActive(IRQn_Type IRQn)
{
  return((uint32_t)((NVIC->IABR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0)); /* Return 1 if active else 0 */
}

/**
 * @brief  Set the priority for an interrupt
 *
 * @param  IRQn_Type IRQn is the Number of the interrupt
 * @param  priority is the priority for the interrupt
 * @return none
 *
 * Set the priority for the specified interrupt. The interrupt 
 * number can be positive to specify an external (device specific) 
 * interrupt, or negative to specify an internal (core) interrupt. \n
 *
 * Note: The priority cannot be set for every core interrupt.
 */
static __INLINE void NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
  if(IRQn < 0) {
    SCB->SHP[((uint32_t)(IRQn) & 0xF)-4] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff); } /* set Priority for Cortex-M3 System Interrupts */
  else {
    NVIC->IP[(uint32_t)(IRQn)] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff);    }        /* set Priority for device specific Interrupts      */
}

/**
 * @brief  Read the priority for an interrupt
 *
 * @param  IRQn_Type IRQn is the Number of the interrupt
 * @return uint32_t  priority is the priority for the interrupt
 *
 * Read the priority for the specified interrupt. The interrupt 
 * number can be positive to specify an external (device specific) 
 * interrupt, or negative to specify an internal (core) interrupt.
 *
 * The returned priority value is automatically aligned to the implemented
 * priority bits of the microcontroller.
 *
 * Note: The priority cannot be set for every core interrupt.
 */
static __INLINE uint32_t NVIC_GetPriority(IRQn_Type IRQn)
{

  if(IRQn < 0) {
    return((uint32_t)(SCB->SHP[((uint32_t)(IRQn) & 0xF)-4] >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for Cortex-M3 system interrupts */
  else {
    return((uint32_t)(NVIC->IP[(uint32_t)(IRQn)]           >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for device specific interrupts  */
}


/**
 * @brief  Encode the priority for an interrupt
 *
 * @param  uint32_t PriorityGroup   is the used priority group
 * @param  uint32_t PreemptPriority is the preemptive priority value (starting from 0)
 * @param  uint32_t SubPriority     is the sub priority value (starting from 0)
 * @return uint32_t                    the priority for the interrupt
 *
 * Encode the priority for an interrupt with the given priority group,
 * preemptive priority value and sub priority value.
 * In case of a conflict between priority grouping and available
 * priority bits (__NVIC_PRIO_BITS) the samllest possible priority group is set.
 *
 * The returned priority value can be used for NVIC_SetPriority(...) function
 */
static __INLINE uint32_t NVIC_EncodePriority (uint32_t PriorityGroup, uint32_t PreemptPriority, uint32_t SubPriority)
{
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);                         /* only values 0..7 are used          */
  uint32_t PreemptPriorityBits;
  uint32_t SubPriorityBits;

  PreemptPriorityBits = ((7 - PriorityGroupTmp) > __NVIC_PRIO_BITS) ? __NVIC_PRIO_BITS : 7 - PriorityGroupTmp;
  SubPriorityBits     = ((PriorityGroupTmp + __NVIC_PRIO_BITS) < 7) ? 0 : PriorityGroupTmp - 7 + __NVIC_PRIO_BITS;
 
  return (
           ((PreemptPriority & ((1 << (PreemptPriorityBits)) - 1)) << SubPriorityBits) |
           ((SubPriority     & ((1 << (SubPriorityBits    )) - 1)))
         );
}


/**
 * @brief  Decode the priority of an interrupt
 *
 * @param  uint32_t   Priority       the priority for the interrupt
 * @param  uint32_t   PrioGroup   is the used priority group
 * @param  uint32_t* pPreemptPrio is the preemptive priority value (starting from 0)
 * @param  uint32_t* pSubPrio     is the sub priority value (starting from 0)
 * @return none
 *
 * Decode an interrupt priority value with the given priority group to 
 * preemptive priority value and sub priority value.
 * In case of a conflict between priority grouping and available
 * priority bits (__NVIC_PRIO_BITS) the samllest possible priority group is set.
 *
 * The priority value can be retrieved with NVIC_GetPriority(...) function
 */
static __INLINE void NVIC_DecodePriority (uint32_t Priority, uint32_t PriorityGroup, uint32_t* pPreemptPriority, uint32_t* pSubPriority)
{
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);                         /* only values 0..7 are used          */
  uint32_t PreemptPriorityBits;
  uint32_t SubPriorityBits;

  PreemptPriorityBits = ((7 - PriorityGroupTmp) > __NVIC_PRIO_BITS) ? __NVIC_PRIO_BITS : 7 - PriorityGroupTmp;
  SubPriorityBits     = ((PriorityGroupTmp + __NVIC_PRIO_BITS) < 7) ? 0 : PriorityGroupTmp - 7 + __NVIC_PRIO_BITS;
  
  *pPreemptPriority = (Priority >> SubPriorityBits) & ((1 << (PreemptPriorityBits)) - 1);
  *pSubPriority     = (Priority                   ) & ((1 << (SubPriorityBits    )) - 1);
}



/* ##################################    SysTick function  ############################################ */

#if (!defined (__Vendor_SysTickConfig)) || (__Vendor_SysTickConfig == 0)

/* SysTick constants */
#define SYSTICK_ENABLE              0                                          /* Config-Bit to start or stop the SysTick Timer                         */
#define SYSTICK_TICKINT             1                                          /* Config-Bit to enable or disable the SysTick interrupt                 */
#define SYSTICK_CLKSOURCE           2                                          /* Clocksource has the offset 2 in SysTick Control and Status Register   */
#define SYSTICK_MAXCOUNT       ((1<<24) -1)                                    /* SysTick MaxCount                                                      */

/**
 * @brief  Initialize and start the SysTick counter and its interrupt.
 *
 * @param  uint32_t ticks is the number of ticks between two interrupts
 * @return  none
 *
 * Initialise the system tick timer and its interrupt and start the
 * system tick timer / counter in free running mode to generate 
 * periodical interrupts.
 */
static __INLINE uint32_t SysTick_Config(uint32_t ticks)
{ 
  if (ticks > SYSTICK_MAXCOUNT)  return (1);                                             /* Reload value impossible */

  SysTick->LOAD  =  (ticks & SYSTICK_MAXCOUNT) - 1;                                      /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);                            /* set Priority for Cortex-M0 System Interrupts */
  SysTick->VAL   =  (0x00);                                                              /* Load the SysTick Counter Value */
  SysTick->CTRL = (1 << SYSTICK_CLKSOURCE) | (1<<SYSTICK_ENABLE) | (1<<SYSTICK_TICKINT); /* Enable SysTick IRQ and SysTick Timer */
  return (0);                                                                            /* Function successful */
}

#endif





/* ##################################    Reset function  ############################################ */

/**
 * @brief  Initiate a system reset request.
 *
 * @param   none
 * @return  none
 *
 * Initialize a system reset request to reset the MCU
 */
static __INLINE void NVIC_SystemReset(void)
{
  SCB->AIRCR  = (NVIC_AIRCR_VECTKEY | (SCB->AIRCR & (0x700)) | (1<<NVIC_SYSRESETREQ)); /* Keep priority group unchanged */
  __DSB();                                                                             /* Ensure completion of memory access */              
  while(1);                                                                            /* wait until reset */
}


/* ##################################    Debug Output  function  ############################################ */


/**
 * @brief  Outputs a character via the ITM channel 0
 *
 * @param   uint32_t character to output
 * @return  uint32_t input character
 *
 * The function outputs a character via the ITM channel 0. 
 * The function returns when no debugger is connected that has booked the output.  
 * It is blocking when a debugger is connected, but the previous character send is not transmitted. 
 */
static __INLINE uint32_t ITM_SendChar (uint32_t ch)
{
  if (ch == '\n') ITM_SendChar('\r');
  
  if ((CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA)  &&
      (ITM->TCR & ITM_TCR_ITMENA)                  &&
      (ITM->TER & (1UL << 0))  ) 
  {
    while (ITM->PORT[0].u32 == 0);
    ITM->PORT[0].u8 = (uint8_t) ch;
  }  
  return (ch);
}

#ifdef __cplusplus
}
#endif

#endif /* __CM3_CORE_H__ */

/*lint -restore */

 /****************************************************************************
 *   $Id:: i2c.h 5865 2010-12-08 21:42:21Z usb00423                         $
 *   Project: NXP LPC17xx I2C example
 *
 *   Description:
 *     This file contains I2C code header definition.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#ifndef __I2C_H 
#define __I2C_H

/* If I2C SEEPROM is tested, make sure FAST_MODE_PLUS is 0.
For board to board test, this flag can be turned on. */

#define FAST_MODE_PLUS      0

#define I2C_PORT_NUM        3
#define BUFSIZE             64
#define MAX_TIMEOUT         0x00FFFFFF

static LPC_I2C_TypeDef (* const LPC_I2C[I2C_PORT_NUM]) = { LPC_I2C0, LPC_I2C1, LPC_I2C2 };

#define I2CMASTER           0x01
#define I2CSLAVE            0x02

#define PCF8594_ADDR        0x40
#define READ_WRITE          0x01

#define RD_BIT              0x01

#define I2C_IDLE              0
#define I2C_STARTED           1
#define I2C_RESTARTED         2
#define I2C_REPEATED_START    3
#define DATA_ACK              4
#define DATA_NACK             5
#define I2C_BUSY              6
#define I2C_NO_DATA           7
#define I2C_NACK_ON_ADDRESS   8
#define I2C_NACK_ON_DATA      9
#define I2C_ARBITRATION_LOST  10
#define I2C_TIME_OUT          11
#define I2C_OK                12

#define I2CONSET_I2EN       (0x1<<6)  /* I2C Control Set Register */
#define I2CONSET_AA         (0x1<<2)
#define I2CONSET_SI         (0x1<<3)
#define I2CONSET_STO        (0x1<<4)
#define I2CONSET_STA        (0x1<<5)

#define I2CONCLR_AAC        (0x1<<2)  /* I2C Control clear Register */
#define I2CONCLR_SIC        (0x1<<3)
#define I2CONCLR_STAC       (0x1<<5)
#define I2CONCLR_I2ENC      (0x1<<6)

#define I2DAT_I2C0x00000000  /* I2C Data Reg */
#define I2ADR_I2C0x00000000  /* I2C Slave Address Reg */
#define I2SCLH_SCLH0x00000080  /* I2C SCL Duty Cycle High Reg */
#define I2SCLL_SCLL0x00000080  /* I2C SCL Duty Cycle Low Reg */
#define I2SCLH_HS_SCLH0x00000008  /* Fast Plus I2C SCL Duty Cycle High Reg */
#define I2SCLL_HS_SCLL0x00000008  /* Fast Plus I2C SCL Duty Cycle Low Reg */

extern void I2C0_IRQHandler( void );
extern void I2C1_IRQHandler( void );
extern void I2C2_IRQHandler( void );
extern void I2C0Init( void );
extern void I2C1Init( void );
extern void I2C2Init( void );
extern uint32_t I2CStart( uint32_t portNum );
extern uint32_t I2CStop( uint32_t portNum );
extern uint32_t I2CEngine( uint32_t portNum );


#endif /* end __I2C_H */
/****************************************************************************
**                            End Of File
*****************************************************************************/

/****************************************************************************
 *   $Id:: i2c.c 5865 2010-12-08 21:42:21Z usb00423                         $
 *   Project: NXP LPC17xx I2C example
 *
 *   Description:
 *     This file contains I2C code example which include I2C initialization, 
 *     I2C interrupt handler, and APIs for I2C access.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#include "lpc17xx.h"
#include "type.h"
#include "i2c.h"

volatile uint32_t I2CMasterState[I2C_PORT_NUM] = {I2C_IDLE,I2C_IDLE,I2C_IDLE};
volatile uint32_t timeout[I2C_PORT_NUM] = {0, 0, 0};

volatile uint8_t I2CMasterBuffer[I2C_PORT_NUM][BUFSIZE];
volatile uint8_t I2CSlaveBuffer[I2C_PORT_NUM][BUFSIZE];
volatile uint32_t I2CCount[I2C_PORT_NUM] = {0, 0, 0};
volatile uint32_t I2CReadLength[I2C_PORT_NUM];
volatile uint32_t I2CWriteLength[I2C_PORT_NUM];

volatile uint32_t RdIndex0 = 0, RdIndex1 = 0, RdIndex2 = 0;
volatile uint32_t WrIndex0 = 0, WrIndex1 = 0, WrIndex2 = 0;

/* 
From device to device, the I2C communication protocol may vary, 
in the example below, the protocol uses repeated start to read data from or 
write to the device:
For master read: the sequence is: STA,Addr(W),offset,RE-STA,Addr(r),data...STO 
for master write: the sequence is: STA,Addr(W),offset,RE-STA,Addr(w),data...STO
Thus, in state 8, the address is always WRITE. in state 10, the address could 
be READ or WRITE depending on the I2C command.
*/   

/*****************************************************************************
** Function name:I2C_IRQHandler
**
** Descriptions:I2C interrupt handler, deal with master mode only.
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C0_IRQHandler(void) 
{
  uint8_t StatValue;

  timeout[0] = 0;
  /* this handler deals with master read and master write only */
  StatValue = LPC_I2C0->STAT;
  switch ( StatValue )
  {
case 0x08:/* A Start condition is issued. */
WrIndex0 = 0;
LPC_I2C0->DAT = I2CMasterBuffer[0][WrIndex0++];
LPC_I2C0->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x10:/* A repeated started is issued */
RdIndex0 = 0;
/* Send SLA with R bit set, */
LPC_I2C0->DAT = I2CMasterBuffer[0][WrIndex0++];
LPC_I2C0->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x18:/* Regardless, it's a ACK */
if ( I2CWriteLength[0] == 1 )
{
  LPC_I2C0->CONSET = I2CONSET_STO;      /* Set Stop flag */
  I2CMasterState[0] = I2C_NO_DATA;
}
else
{
  LPC_I2C0->DAT = I2CMasterBuffer[0][WrIndex0++];
}
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x28:/* Data byte has been transmitted, regardless ACK or NACK */
if ( WrIndex0 < I2CWriteLength[0] )
{   
  LPC_I2C0->DAT = I2CMasterBuffer[0][WrIndex0++]; /* this should be the last one */
}
else
{
  if ( I2CReadLength[0] != 0 )
  {
LPC_I2C0->CONSET = I2CONSET_STA;/* Set Repeated-start flag */
  }
  else
  {
LPC_I2C0->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[0] = I2C_OK;
  }
}
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x30:
LPC_I2C0->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[0] = I2C_NACK_ON_DATA;
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x40:/* Master Receive, SLA_R has been sent */
if ( (RdIndex0 + 1) < I2CReadLength[0] )
{
  /* Will go to State 0x50 */
  LPC_I2C0->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  /* Will go to State 0x58 */
  LPC_I2C0->CONCLR = I2CONCLR_AAC;/* assert NACK after data is received */
}
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x50:/* Data byte has been received, regardless following ACK or NACK */
I2CSlaveBuffer[0][RdIndex0++] = LPC_I2C0->DAT;
if ( (RdIndex0 + 1) < I2CReadLength[0] )
{   
  LPC_I2C0->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  LPC_I2C0->CONCLR = I2CONCLR_AAC;/* assert NACK on last byte */
}
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x58:
I2CSlaveBuffer[0][RdIndex0++] = LPC_I2C0->DAT;
I2CMasterState[0] = I2C_OK;
LPC_I2C0->CONSET = I2CONSET_STO;/* Set Stop flag */ 
LPC_I2C0->CONCLR = I2CONCLR_SIC;/* Clear SI flag */
break;

case 0x20:/* regardless, it's a NACK */
case 0x48:
LPC_I2C0->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[0] = I2C_NACK_ON_ADDRESS;
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;

case 0x38:/* Arbitration lost, in this example, we don't
deal with multiple master situation */
default:
I2CMasterState[0] = I2C_ARBITRATION_LOST;
LPC_I2C0->CONCLR = I2CONCLR_SIC;
break;
  }
  return;
}

/*****************************************************************************
** Function name:I2C_IRQHandler
**
** Descriptions:I2C interrupt handler, deal with master mode only.
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C1_IRQHandler(void) 
{
  uint8_t StatValue;

  timeout[1] = 0;
  /* this handler deals with master read and master write only */
  StatValue = LPC_I2C1->STAT;
  switch ( StatValue )
  {
case 0x08:/* A Start condition is issued. */
WrIndex1 = 0;
LPC_I2C1->DAT = I2CMasterBuffer[1][WrIndex1++];
LPC_I2C1->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x10:/* A repeated started is issued */
RdIndex1 = 0;
/* Send SLA with R bit set, */
LPC_I2C1->DAT = I2CMasterBuffer[1][WrIndex1++];
LPC_I2C1->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x18:/* Regardless, it's a ACK */
if ( I2CWriteLength[1] == 1 )
{
  LPC_I2C1->CONSET = I2CONSET_STO;      /* Set Stop flag */
  I2CMasterState[1] = I2C_NO_DATA;
}
else
{
  LPC_I2C1->DAT = I2CMasterBuffer[1][WrIndex1++];
}
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x28:/* Data byte has been transmitted, regardless ACK or NACK */
if ( WrIndex1 < I2CWriteLength[1] )
{   
  LPC_I2C1->DAT = I2CMasterBuffer[1][WrIndex1++]; /* this should be the last one */
}
else
{
  if ( I2CReadLength[1] != 0 )
  {
LPC_I2C1->CONSET = I2CONSET_STA;/* Set Repeated-start flag */
  }
  else
  {
LPC_I2C1->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[1] = I2C_OK;
  }
}
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x30:
LPC_I2C1->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[1] = I2C_NACK_ON_DATA;
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x40:/* Master Receive, SLA_R has been sent */
if ( (RdIndex1 + 1) < I2CReadLength[1] )
{
  /* Will go to State 0x50 */
  LPC_I2C1->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  /* Will go to State 0x58 */
  LPC_I2C1->CONCLR = I2CONCLR_AAC;/* assert NACK after data is received */
}
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x50:/* Data byte has been received, regardless following ACK or NACK */
I2CSlaveBuffer[1][RdIndex1++] = LPC_I2C1->DAT;
if ( (RdIndex1 + 1) < I2CReadLength[1] )
{   
  LPC_I2C1->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  LPC_I2C1->CONCLR = I2CONCLR_AAC;/* assert NACK on last byte */
}
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x58:
I2CSlaveBuffer[1][RdIndex1++] = LPC_I2C1->DAT;
I2CMasterState[1] = I2C_OK;
LPC_I2C1->CONSET = I2CONSET_STO;/* Set Stop flag */ 
LPC_I2C1->CONCLR = I2CONCLR_SIC;/* Clear SI flag */
break;

case 0x20:/* regardless, it's a NACK */
case 0x48:
LPC_I2C1->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[1] = I2C_NACK_ON_ADDRESS;
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;

case 0x38:/* Arbitration lost, in this example, we don't
deal with multiple master situation */
default:
I2CMasterState[1] = I2C_ARBITRATION_LOST;
LPC_I2C1->CONCLR = I2CONCLR_SIC;
break;
  }
  return;
}

/*****************************************************************************
** Function name:I2C_IRQHandler
**
** Descriptions:I2C interrupt handler, deal with master mode only.
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C2_IRQHandler(void) 
{
  uint8_t StatValue;

  timeout[2] = 0;
  /* this handler deals with master read and master write only */
  StatValue = LPC_I2C2->STAT;
  switch ( StatValue )
  {
case 0x08:/* A Start condition is issued. */
WrIndex2 = 0;
LPC_I2C2->DAT = I2CMasterBuffer[2][WrIndex2++];
LPC_I2C2->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x10:/* A repeated started is issued */
RdIndex2 = 0;
/* Send SLA with R bit set, */
LPC_I2C2->DAT = I2CMasterBuffer[2][WrIndex2++];
LPC_I2C2->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
break;

case 0x18:/* Regardless, it's a ACK */
if ( I2CWriteLength[2] == 1 )
{
  LPC_I2C2->CONSET = I2CONSET_STO;      /* Set Stop flag */
  I2CMasterState[2] = I2C_NO_DATA;
}
else
{
  LPC_I2C2->DAT = I2CMasterBuffer[2][WrIndex2++];
}
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x28:/* Data byte has been transmitted, regardless ACK or NACK */
if ( WrIndex2 < I2CWriteLength[2] )
{   
  LPC_I2C2->DAT = I2CMasterBuffer[2][WrIndex2++]; /* this should be the last one */
}
else
{
  if ( I2CReadLength[2] != 0 )
  {
LPC_I2C2->CONSET = I2CONSET_STA;/* Set Repeated-start flag */
  }
  else
  {
LPC_I2C2->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[2] = I2C_OK;
  }
}
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x30:
LPC_I2C2->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[2] = I2C_NACK_ON_DATA;
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x40:/* Master Receive, SLA_R has been sent */
if ( (RdIndex2 + 1) < I2CReadLength[2] )
{
  /* Will go to State 0x50 */
  LPC_I2C2->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  /* Will go to State 0x58 */
  LPC_I2C2->CONCLR = I2CONCLR_AAC;/* assert NACK after data is received */
}
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x50:/* Data byte has been received, regardless following ACK or NACK */
I2CSlaveBuffer[2][RdIndex2++] = LPC_I2C2->DAT;
if ( (RdIndex2 + 1) < I2CReadLength[2] )
{   
  LPC_I2C2->CONSET = I2CONSET_AA;/* assert ACK after data is received */
}
else
{
  LPC_I2C2->CONCLR = I2CONCLR_AAC;/* assert NACK on last byte */
}
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x58:
I2CSlaveBuffer[2][RdIndex2++] = LPC_I2C2->DAT;
I2CMasterState[2] = I2C_OK;
LPC_I2C2->CONSET = I2CONSET_STO;/* Set Stop flag */ 
LPC_I2C2->CONCLR = I2CONCLR_SIC;/* Clear SI flag */
break;

case 0x20:/* regardless, it's a NACK */
case 0x48:
LPC_I2C2->CONSET = I2CONSET_STO;      /* Set Stop flag */
I2CMasterState[2] = I2C_NACK_ON_ADDRESS;
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;

case 0x38:/* Arbitration lost, in this example, we don't
deal with multiple master situation */
default:
I2CMasterState[2] = I2C_ARBITRATION_LOST;
LPC_I2C2->CONCLR = I2CONCLR_SIC;
break;
  }
  return;
}

/*****************************************************************************
** Function name:I2CStart
**
** Descriptions:Create I2C start condition, a timeout
**value is set if the I2C never gets started,
**and timed out. It's a fatal error. 
**
** parameters:None
** Returned value:true or false, return false if timed out
** 
*****************************************************************************/
uint32_t I2CStart( uint32_t portNum )
{
  uint32_t retVal = FALSE;
 
  timeout[portNum] = 0;
  /*--- Issue a start condition ---*/
  LPC_I2C[portNum]->CONSET = I2CONSET_STA;/* Set Start flag */
    
  /*--- Wait until START transmitted ---*/
  while( 1 )
  {
if ( I2CMasterState[portNum] == I2C_STARTED )
{
  retVal = TRUE;
  break;
}
if ( timeout[portNum] >= MAX_TIMEOUT )
{
  retVal = FALSE;
  break;
}
timeout[portNum]++;
  }
  return( retVal );
}

/*****************************************************************************
** Function name:I2CStop
**
** Descriptions:Set the I2C stop condition, if the routine
**never exit, it's a fatal bus error.
**
** parameters:None
** Returned value:true or never return
** 
*****************************************************************************/
uint32_t I2CStop( uint32_t portNum )
{
  LPC_I2C[portNum]->CONSET = I2CONSET_STO;      /* Set Stop flag */ 
  LPC_I2C[portNum]->CONCLR = I2CONCLR_SIC;  /* Clear SI flag */ 
            
  /*--- Wait for STOP detected ---*/
  while( LPC_I2C[portNum]->CONSET & I2CONSET_STO );
  return TRUE;
}

/*****************************************************************************
** Function name:I2CInit
**
** Descriptions:Initialize I2C controller as a master
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C0Init( void ) 
{
  LPC_SC->PCONP |= (1 << 7);

  /* set PIO0.27 and PIO0.28 to I2C0 SDA and SCL */
  /* function to 01 on both SDA and SCL. */
  LPC_PINCON->PINSEL1 &= ~((0x03<<22)|(0x03<<24));
  LPC_PINCON->PINSEL1 |= ((0x01<<22)|(0x01<<24));
 
  /*--- Clear flags ---*/
  LPC_I2C0->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC;    

  /*--- Reset registers ---*/
#if FAST_MODE_PLUS
  LPC_PINCON->I2CPADCFG |= ((0x1<<0)|(0x1<<2));
  LPC_I2C0->SCLL   = I2SCLL_HS_SCLL;
  LPC_I2C0->SCLH   = I2SCLH_HS_SCLH;
#else
  LPC_PINCON->I2CPADCFG &= ~((0x1<<0)|(0x1<<2));
  LPC_I2C0->SCLL   = I2SCLL_SCLL;
  LPC_I2C0->SCLH   = I2SCLH_SCLH;
#endif

  /* Install interrupt handler */
  NVIC_EnableIRQ(I2C0_IRQn);

  LPC_I2C0->CONSET = I2CONSET_I2EN;
  return;
}

/*****************************************************************************
** Function name:I2C1Init
**
** Descriptions:Initialize I2C controller as a master
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C1Init( void ) 
{
  LPC_SC->PCONP |= (1 << 19);

#if 0
  /* set PIO0.0 and PIO0.1 to I2C1 SDA and SCL */
  /* function to 11 on both SDA and SCL. */
  LPC_PINCON->PINSEL0 &= ~((0x3<<0)|(0x3<<2));
  LPC_PINCON->PINSEL0 |= ((0x3<<0)|(0x3<<2));
  LPC_PINCON->PINMODE0 &= ~((0x3<<0)|(0x3<<2));
  LPC_PINCON->PINMODE0 |= ((0x2<<0)|(0x2<<2));/* No pull-up no pull-down */
  LPC_PINCON->PINMODE_OD0 |= ((0x01<<0)|(0x1<<1));/* Open drain */
#endif
#if 1
  /* set PIO0.19 and PIO0.20 to I2C1 SDA and SCL */
  /* function to 11 on both SDA and SCL. */
  LPC_PINCON->PINSEL1 &= ~((0x3<<6)|(0x3<<8));
  LPC_PINCON->PINSEL1 |= ((0x3<<6)|(0x3<<8));
  LPC_PINCON->PINMODE1 &= ~((0x3<<6)|(0x3<<8));
  LPC_PINCON->PINMODE1 |= ((0x2<<6)|(0x2<<8));/* No pull-up no pull-down */
  LPC_PINCON->PINMODE_OD0 |= ((0x1<<19)|(0x1<<20));
#endif
 
  /*--- Clear flags ---*/
  LPC_I2C1->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC;    

  /*--- Reset registers ---*/
  LPC_I2C1->SCLL   = I2SCLL_SCLL;
  LPC_I2C1->SCLH   = I2SCLH_SCLH;

  /* Install interrupt handler */
  NVIC_EnableIRQ(I2C1_IRQn);

  LPC_I2C1->CONSET = I2CONSET_I2EN;
  return;
}

/*****************************************************************************
** Function name:I2C2Init
**
** Descriptions:Initialize I2C controller as a master
**
** parameters:None
** Returned value:None
** 
*****************************************************************************/
void I2C2Init( void ) 
{
  LPC_SC->PCONP |= (1 << 26);

  /* set PIO0.10 and PIO0.11 to I2C2 SDA and SCL */
  /* function to 10 on both SDA and SCL. */
  LPC_PINCON->PINSEL0 &= ~((0x03<<20)|(0x03<<22));
  LPC_PINCON->PINSEL0 |= ((0x02<<20)|(0x02<<22));
  LPC_PINCON->PINMODE0 &= ~((0x03<<20)|(0x03<<22));
  LPC_PINCON->PINMODE0 |= ((0x02<<20)|(0x2<<22));/* No pull-up no pull-down */
  LPC_PINCON->PINMODE_OD0 |= ((0x01<<10)|(0x1<<11));
 
  /*--- Clear flags ---*/
  LPC_I2C2->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC;    

  /*--- Reset registers ---*/
  LPC_I2C2->SCLL   = I2SCLL_SCLL;
  LPC_I2C2->SCLH   = I2SCLH_SCLH;

  /* Install interrupt handler */
  NVIC_EnableIRQ(I2C2_IRQn);

  LPC_I2C2->CONSET = I2CONSET_I2EN;
  return;
}

/*****************************************************************************
** Function name:I2CEngine
**
** Descriptions:The routine to complete a I2C transaction
**from start to stop. All the intermitten
**steps are handled in the interrupt handler.
**Before this routine is called, the read
**length, write length, I2C master buffer,
**and I2C command fields need to be filled.
**see i2cmst.c for more details. 
**
** parameters:I2C port number
** Returned value:master state of current I2C port.
** 
*****************************************************************************/
uint32_t I2CEngine( uint32_t portNum ) 
{
  /*--- Issue a start condition ---*/
  LPC_I2C[portNum]->CONSET = I2CONSET_STA;/* Set Start flag */

  I2CMasterState[portNum] = I2C_BUSY;

  while ( I2CMasterState[portNum] == I2C_BUSY )
  {
if ( timeout[portNum] >= MAX_TIMEOUT )
{
  I2CMasterState[portNum] = I2C_TIME_OUT;
  break;
}
timeout[portNum]++;
  }
  LPC_I2C[portNum]->CONCLR = I2CONCLR_STAC;

  return ( I2CMasterState[portNum] );
}

/******************************************************************************
**                            End Of File
******************************************************************************/

Original Attachment has been moved to: I2C.rar

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