LPUART COMMUNICATION Error was able to Tx but couldn't get Rx

[akhilranga]

 Hi there,

I am trying to send a specific array to my slave board and it should reply back with an acknowledgement . But i was unable to receive any information. I am attaching my code below and will also attach the data sheet of my slave board. Can someonme help me identify the issue.

/*
 * Copyright (c) 2015 - 2016 , Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 * All rights reserved.
 *
 * THIS SOFTWARE IS PROVIDED BY NXP "AS IS" AND ANY EXPRESSED OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL NXP OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */


/* Including needed modules to compile this module/procedure */
#include "Cpu.h"
#include "clockMan1.h"
#include "pin_mux.h"
#if CPU_INIT_CONFIG
  #include "Init_Config.h"
#endif

volatile int exit_code = 0;
/* User includes (#include below this line is not maintained by Processor Expert) */

#include <stdint.h>
#include <stdbool.h>

/* This example is setup to work by default with EVB. To use it with other boards
   please comment the following line
*/

//#define GPIOE_PORT                         PTE
//#define GPIOC_PORT                         PTC
//#define GPIOD_PORT           		       PTD
//#define Push_Button_Switch                 4U  //PTD
//#define High_Beam_Switch                   11U //PTE
//#define Indicator_Left_Switch              0U  //PTE
//#define Indicator_Right_Switch             1U  //PTE
//#define Bat_Lock_Switch                    2U  //PTE
//#define Brake_Switch                       9U  //PTE
//#define WS_Relay                           7U  //PTE
//#define Ignition_Relay                     8U  //PTE
//#define DCU_Relay                          10U //PTE
//#define Lighting_Relay                     3U  //PTE
//#define Bat_Lock_Relay					   6u //PTC
//#define Park_Detect                        7u //PTC




// UART LOCK Module command frames

uint8_t unlock_cmd[12] =       {0xFF,0xFF,0x55,0xAA,0x01,0x10,0x31,0x02,0x21,0x01,0x99,0xFF};
uint8_t Read_Lock_Status[12] = {0xFF,0XFF,0x55,0xAA,0x01,0x10,0x31,0x01,0x20,0x01,0x9B,0xFF};
////////////////////////////////0xFF 0XFF 0x55 0xAA 0x01 0x10 0x31 0x01 0x20 0x01 0x9B 0xFF
uint8_t Blankarray[20];
uint32_t Timeout = 100; /* Timeout in ms for blocking operations */
uint8_t arrayindex = 0 ;

void BoardInit(void)
{


    /* Initialize and configure clocks
     *  -   Setup system clocks, dividers
     *  -   Configure FlexCAN clock, GPIO, LPSPI
     *  -   see clock manager component for more details
     */
    CLOCK_SYS_Init(g_clockManConfigsArr, CLOCK_MANAGER_CONFIG_CNT,
                        g_clockManCallbacksArr, CLOCK_MANAGER_CALLBACK_CNT);
    CLOCK_SYS_UpdateConfiguration(0U, CLOCK_MANAGER_POLICY_FORCIBLE);


    /* Initialize pins
     *  -   Init FlexCAN, LPSPI and GPIO pins
     *  -   See PinSettings component for more info
     */
    PINS_DRV_Init(NUM_OF_CONFIGURED_PINS, g_pin_mux_InitConfigArr);
}



void delay(volatile int cycles)
{
    /* Delay function - do nothing for a number of cycles */
    while(cycles--);
}

/*!
  \brief The main function for the project.
  \details The startup initialization sequence is the following:
 * - __start (startup asm routine)
 * - __init_hardware()
 * - main()
 *   - PE_low_level_init()
 *     - Common_Init()
 *     - Peripherals_Init()
*/
int main(void)
{

  /*** Processor Expert internal initialization. DON'T REMOVE THIS CODE!!! ***/
  #ifdef PEX_RTOS_INIT
    PEX_RTOS_INIT();                 /* Initialization of the selected RTOS. Macro is defined by the RTOS component. */
  #endif
  /*** End of Processor Expert internal initialization.                    ***/

    /* Do the initializations required for this application */
        BoardInit();

//     PINS_DRV_WritePin(GPIOE_PORT,DCU_Relay,0);
//     PINS_DRV_WritePin(GPIOE_PORT,Lighting_Relay,0);
//     PINS_DRV_WritePin(GPIOC_PORT,Bat_Lock_Relay,0);

LPUART_DRV_Init(INST_LPUART_LOCK, &lpuart_lock_State, &lpuart_lock_InitConfig0);
delay (100000);

  while (1)
  {
		//if ((PTE->PDIR & (1<<2)) == 0)
		//{
		//LPUART_DRV_SendDataBlocking(INST_LPUART_LOCK,Read_Lock_Status,12,Timeout);
		if (LPUART_DRV_SendDataBlocking(INST_LPUART_LOCK,Read_Lock_Status,12,Timeout)==STATUS_SUCCESS)
		{
		//LPUART_DRV_ReceiveDataBlocking(INST_LPUART_LOCK,Blankarray,12, Timeout);
			if (LPUART_DRV_ReceiveDataBlocking(INST_LPUART_LOCK,Blankarray,12, Timeout)==STATUS_SUCCESS)
			{
				arrayindex++;
			}
		}
		//}

//LPUART_DRV_SendData(INST_LPUART_RFID,Inventory_cmd,5);


//LPUART_DRV_ReceiveDataBlocking(INST_LPUART_LOCK,Blankarray,12, Timeout);
//LPUART_DRV_ReceiveData(INST_LPUART_LOCK,Blankarray,12);


if (Blankarray[0]==0x55 && Blankarray[1]==0xAA && Blankarray[3] ==0x31
&& Blankarray[4]==0x10 && Blankarray[5] ==0x04 )

{
	arrayindex++;
}

  }

  /*** Don't write any code pass this line, or it will be deleted during code generation. ***/
  /*** RTOS startup code. Macro PEX_RTOS_START is defined by the RTOS component. DON'T MODIFY THIS CODE!!! ***/
  #ifdef PEX_RTOS_START
    PEX_RTOS_START();                  /* Startup of the selected RTOS. Macro is defined by the RTOS component. */
  #endif
  /*** End of RTOS startup code.  ***/
  /*** Processor Expert end of main routine. DON'T MODIFY THIS CODE!!! ***/
  for(;;) {
    if(exit_code != 0) {
      break;
    }
  }
  return exit_code;
  /*** Processor Expert end of main routine. DON'T WRITE CODE BELOW!!! ***/
} /*** End of main routine. DO NOT MODIFY THIS TEXT!!! ***/

[PetrS · Accepted solution]

Hi,

try to measure TX/RX lines to know if a desired frame is sent to slave board and any response is seen on RX line. If nothing is sent by slave, then either command is wrong or there is other issue on slave side.

From the MCU side, the code looks normal and I expect TX frame is sent as defined.

BR, Petr

[akhilranga]

Hi Peter, 

Thanks for the reply, can you please explain what do you mean by mesaure the Rx/Tx lines. 

[PetrS]

Hi,

measure MCU pins configured for LPUART TXD/RXD functionality with scope or better some analyzer to be sure which signal is generated by MCU and received from slave.

BR, Petr