Reg:UART Library for LPC1227

lpcware — Wed, 15 Jun 2016 23:25:11 GMT

Content originally posted in LPCWare by Microembedded on Thu May 15 06:04:47 MST 2014
From "I'm looking for a UART library for LPC1114"

i tried to post a message in the previous thread but my message was directed into spam.So i am reposting my message after creating a new thread.

I included the uart.c routine in my main file.This is how it looked like.

#ifdef __USE_CMSIS
#include "LPC122x.h"

#endif

#include <cr_section_macros.h>

#include <NXP/crp.h>
#include <type.h>
#include <gpio.h>
#include <string.h>
#include <uart.h>

/*****************************************************************************
** Function name:UART_IRQHandler
**
** Descriptions:UART interrupt handler
**
** parameters:None
** Returned value:None
**
*****************************************************************************/
void UART0_IRQHandler(void)
{
uint8_t IIRValue, LSRValue;
uint8_t Dummy = Dummy;

IIRValue = LPC_UART0->IIR;

IIRValue >>= 1;/* skip pending bit in IIR */
IIRValue &= 0x07;/* check bit 1~3, interrupt identification */
if (IIRValue == IIR_RLS)/* Receive Line Status */
{
    LSRValue = LPC_UART0->LSR;
    /* Receive Line Status */
    if (LSRValue & (LSR_OE | LSR_PE | LSR_FE | LSR_RXFE | LSR_BI))
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UARTStatus0 = LSRValue;
      Dummy = LPC_UART0->RBR;/* Dummy read on RX to clear
interrupt, then bail out */
      return;
    }
    if (LSRValue & LSR_RDR)/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      UARTBuffer0[UARTCount0++] = LPC_UART0->RBR;
      if (UARTCount0 == BUFFSIZE)
      {
        UARTCount0 = 0;/* buffer overflow */
      }
    }
}
else if (IIRValue == IIR_RDA)/* Receive Data Available */
{
    /* Receive Data Available */
    UARTBuffer0[UARTCount0++] = LPC_UART0->RBR;
    if (UARTCount0 == BUFFSIZE)
    {
      UARTCount0 = 0;/* buffer overflow */
    }
}
else if (IIRValue == IIR_CTI)/* Character timeout indicator */
{
    /* Character Time-out indicator */
    UARTStatus0 |= 0x100;/* Bit 9 as the CTI error */
}
else if (IIRValue == IIR_THRE)/* THRE, transmit holding register empty */
{
    /* THRE interrupt */
    LSRValue = LPC_UART0->LSR;/* Check status in the LSR to see if
valid data in U0THR or not */
    if (LSRValue & LSR_THRE)
    {
      UARTTxEmpty0 = 1;
    }
    else
    {
      UARTTxEmpty0 = 0;
    }
}
return;
}

/*****************************************************************************
** Function name:UART_IRQHandler
**
** Descriptions:UART interrupt handler
**
** parameters:None
** Returned value:None
**
*****************************************************************************/
void UART1_IRQHandler(void)
{
uint8_t IIRValue, LSRValue;
uint8_t Dummy = Dummy;

IIRValue = LPC_UART1->IIR;

IIRValue >>= 1;/* skip pending bit in IIR */
IIRValue &= 0x07;/* check bit 1~3, interrupt identification */
if (IIRValue == IIR_RLS)/* Receive Line Status */
{
    LSRValue = LPC_UART1->LSR;
    /* Receive Line Status */
    if (LSRValue & (LSR_OE | LSR_PE | LSR_FE | LSR_RXFE | LSR_BI))
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UARTStatus1 = LSRValue;
      Dummy = LPC_UART1->RBR;/* Dummy read on RX to clear
interrupt, then bail out */
      return;
    }
    if (LSRValue & LSR_RDR)/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      UARTBuffer1[UARTCount1++] = LPC_UART1->RBR;
      if (UARTCount1 == BUFFSIZE)
      {
        UARTCount1 = 0;/* buffer overflow */
      }
    }
}
else if (IIRValue == IIR_RDA)/* Receive Data Available */
{
    /* Receive Data Available */
    UARTBuffer1[UARTCount1++] = LPC_UART1->RBR;
    if (UARTCount1 == BUFFSIZE)
    {
      UARTCount1 = 0;/* buffer overflow */
    }
}
else if (IIRValue == IIR_CTI)/* Character timeout indicator */
{
    /* Character Time-out indicator */
    UARTStatus1 |= 0x100;/* Bit 9 as the CTI error */
}
else if (IIRValue == IIR_THRE)/* THRE, transmit holding register empty */
{
    /* THRE interrupt */
    LSRValue = LPC_UART1->LSR;/* Check status in the LSR to see if
valid data in U0THR or not */
    if (LSRValue & LSR_THRE)
    {
      UARTTxEmpty1 = 1;
    }
    else
    {
      UARTTxEmpty1 = 0;
    }
}
return;
}

/*****************************************************************************
** Function name:ModemInit
**
** Descriptions:Initialize UART0 port as modem, setup pin select.
**
** parameters:location
** Returned value:None
**
*****************************************************************************/
void ModemInit( uint32_t location )
{
if ( location == 0 )
{
LPC_IOCON->PIO0_3 &= ~0x07;    /* UART I/O config */
LPC_IOCON->PIO0_3 |= 0x02;     /* UART DTR output */
LPC_IOCON->PIO0_7 &= ~0x07;
LPC_IOCON->PIO0_7 |= 0x02;     /* UART CTS input */
LPC_IOCON->PIO0_0 &= ~0x07;
LPC_IOCON->PIO0_0 |= 0x02;     /* UART RTS output */
LPC_IOCON->PIO0_4 &= ~0x07;
LPC_IOCON->PIO0_4 |= 0x02;     /* UART DSR input */
LPC_IOCON->PIO0_5 &= ~0x07;
LPC_IOCON->PIO0_5 |= 0x02;     /* UART DCD input */
LPC_IOCON->PIO0_6 &= ~0x07;
LPC_IOCON->PIO0_6 |= 0x02;     /* UART RI input */
}
else if ( location == 1 )
{
LPC_IOCON->PIO2_3 &= ~0x07;    /* UART I/O config */
LPC_IOCON->PIO2_3 |= 0x04;     /* UART DTR output */
LPC_IOCON->PIO2_4 &= ~0x07;
LPC_IOCON->PIO2_4 |= 0x04;     /* UART CTS input */
LPC_IOCON->PIO2_0 &= ~0x07;
LPC_IOCON->PIO2_0 |= 0x04;     /* UART RTS output */
LPC_IOCON->PIO2_7 &= ~0x07;
LPC_IOCON->PIO2_7 |= 0x04;     /* UART DSR input */
LPC_IOCON->PIO2_6 &= ~0x07;
LPC_IOCON->PIO2_6 |= 0x04;     /* UART DCD input */
LPC_IOCON->PIO2_5 &= ~0x07;
LPC_IOCON->PIO2_5 |= 0x04;     /* UART RI input */
}
LPC_UART0->MCR = 0xC0;          /* Enable Auto RTS and Auto CTS. */
return;
}

/*****************************************************************************
** Function name:SetupUART_Location
**
** Descriptions:Setup UART0 location
**
** parameters:port number, location
** Returned value:None
**
*****************************************************************************/
void SetupUART_Location(uint32_t portNum, uint32_t location)
{
if ( portNum == 0 )
{
if ( location == 0 )
{
LPC_IOCON->PIO0_1 &= ~0x07;    /* UART0 I/O config */
LPC_IOCON->PIO0_1 |= 0x02;     /* UART0 RXD LOC0 */
LPC_IOCON->PIO0_2 &= ~0x07;
LPC_IOCON->PIO0_2 |= 0x02;     /* UART0 TXD LOC0 */
}
else if ( location == 1 )
{
LPC_IOCON->PIO2_1 &= ~0x07;    /* UART0 I/O config */
LPC_IOCON->PIO2_1 |= 0x04;     /* UART0 RXD LOC1 */
LPC_IOCON->PIO2_2 &= ~0x07;
LPC_IOCON->PIO2_2 |= 0x04;     /* UART0 TXD LOC1 */
}
}
else if ( portNum == 1 )
{
if ( location == 0 )
{
LPC_IOCON->PIO0_8 &= ~0x07;    /* UART1 I/O config */
LPC_IOCON->PIO0_8 |= 0x02;     /* UART1 RXD LOC0 */
LPC_IOCON->PIO0_9 &= ~0x07;
LPC_IOCON->PIO0_9 |= 0x02;     /* UART1 TXD LOC0 */
}
else if ( location == 1 )
{
LPC_IOCON->PIO2_11 &= ~0x07;    /* UART1 I/O config */
LPC_IOCON->PIO2_11 |= 0x05;     /* UART RXD LOC1 */
LPC_IOCON->PIO2_10 &= ~0x07;
LPC_IOCON->PIO2_10 |= 0x05;     /* UART TXD LOC1 */
}
else
{
LPC_IOCON->PIO2_12 &= ~0x07;    /* UART1 I/O config */
LPC_IOCON->PIO2_12 |= 0x03;     /* UART RXD LOC1 */
LPC_IOCON->PIO2_13 &= ~0x07;
LPC_IOCON->PIO2_13 |= 0x03;     /* UART TXD LOC1 */
}
}
else
{
while ( 1 );
}
return;
}

/*****************************************************************************
** Function name:UARTInit
**
** Descriptions:Initialize UARTx port, setup pin select,
**clock, parity, stop bits, FIFO, etc.
**
** parameters:UART port number, baudrate
** Returned value:None
**
*****************************************************************************/
void UARTInit(uint32_t portNum, uint32_t baudrate)
{
uint32_t i, Fdiv;
uint32_t regVal;

if ( portNum == 0 )
{
UARTTxEmpty0 = 1;
UARTCount0 = 0;
    for ( i = 0; i < BUFFSIZE; i++ )
{
UARTBuffer0 = 0;
}
NVIC_DisableIRQ(UART0_IRQn);

SetupUART_Location( portNum, 0 );/* default is location 0 */

/* Enable UART 0 clock */
LPC_SYSCON->PRESETCTRL |= (0x1<<2);
LPC_SYSCON->SYSAHBCLKCTRL |= (0x1<<12);
LPC_SYSCON->UART0CLKDIV = 0x1;     /* divided by 1 */

LPC_UART0->LCR = 0x83;             /* 8 bits, no Parity, 1 Stop bit */
regVal = LPC_SYSCON->UART0CLKDIV;
Fdiv = ((SystemCoreClock/regVal)/16)/baudrate ;/*baud rate */ //16

//LPC_UART0->DLM = Fdiv / 256;
LPC_UART0->DLM = 0x00;
//LPC_UART0->DLL = Fdiv % 256;
LPC_UART0->DLL = 0x16;
LPC_UART0->LCR = 0x03;/* DLAB = 0 */
LPC_UART0->FDR = 0x10;/* set to default value: 0x10 *///0x10
LPC_UART0->FCR = 0x07;/* Enable and reset TX and RX FIFO. */

/* Read to clear the line status. */
regVal = LPC_UART0->LSR;

/* Ensure a clean start, no data in either TX or RX FIFO. */
while ( (LPC_UART0->LSR & (LSR_THRE|LSR_TEMT)) != (LSR_THRE|LSR_TEMT) );
while ( LPC_UART0->LSR & LSR_RDR )
{
regVal = LPC_UART0->RBR;/* Dump data from RX FIFO */
}

/* Enable the UART Interrupt */
NVIC_EnableIRQ(UART0_IRQn);

#if TX_INTERRUPT
LPC_UART0->IER = IER_RBR | IER_THRE | IER_RLS;/* Enable UART interrupt */
#else
LPC_UART0->IER = IER_RBR | IER_RLS;/* Enable UART interrupt */
#endif
}
else
{
UARTTxEmpty1 = 1;
UARTCount1 = 0;
    for ( i = 0; i < BUFFSIZE; i++ )
{
UARTBuffer1 = 0;
}
NVIC_DisableIRQ(UART1_IRQn);

SetupUART_Location( portNum, 0 );/* default is location 0 */

/* Enable UART 1 clock */
LPC_SYSCON->PRESETCTRL |= (0x1<<3);
LPC_SYSCON->SYSAHBCLKCTRL |= (0x1<<13);
LPC_SYSCON->UART1CLKDIV = 0x1;     /* divided by 1 */

LPC_UART1->LCR = 0x83;             /* 8 bits, no Parity, 1 Stop bit */
regVal = LPC_SYSCON->UART1CLKDIV;
Fdiv = ((SystemCoreClock/regVal)/12)/baudrate ;/*baud rate */

LPC_UART1->DLM = Fdiv / 256;
LPC_UART1->DLL = Fdiv % 256;
LPC_UART1->LCR = 0x03;/* DLAB = 0 */
LPC_UART1->FDR = 0x10;/* set to default value: 0x10 */
LPC_UART1->FCR = 0x07;/* Enable and reset TX and RX FIFO. */

/* Read to clear the line status. */
regVal = LPC_UART1->LSR;

/* Ensure a clean start, no data in either TX or RX FIFO. */
while ( (LPC_UART1->LSR & (LSR_THRE|LSR_TEMT)) != (LSR_THRE|LSR_TEMT) );
while ( LPC_UART1->LSR & LSR_RDR )
{
regVal = LPC_UART1->RBR;/* Dump data from RX FIFO */
}

/* Enable the UART Interrupt */
NVIC_EnableIRQ(UART1_IRQn);

#if TX_INTERRUPT
LPC_UART1->IER = IER_RBR | IER_THRE | IER_RLS;/* Enable UART interrupt */
#else
LPC_UART1->IER = IER_RBR | IER_RLS;/* Enable UART interrupt */
#endif
}
return;
}

/*****************************************************************************
** Function name:UARTSend
**
** Descriptions:Send a block of data to the UART 0 port based
**on the data length
**
** parameters:portNum, buffer pointer, and data length
** Returned value:None
**
*****************************************************************************/
void UARTSend(uint32_t portNum, uint8_t *BufferPtr, uint32_t Length)
{

while ( Length != 0 )
{
if ( portNum == 0 )
{
/* THRE status, contain valid data */
#if !TX_INTERRUPT
while ( !(LPC_UART0->LSR & LSR_THRE) );
LPC_UART0->THR = *BufferPtr;
#else
/* Below flag is set inside the interrupt handler when THRE occurs. */
      while ( !(UARTTxEmpty0 & 0x01) );
LPC_UART0->THR = *BufferPtr;
      UARTTxEmpty0 = 0;/* not empty in the THR until it shifts out */
#endif
}
else
{
/* THRE status, contain valid data */
#if !TX_INTERRUPT
while ( !(LPC_UART1->LSR & LSR_THRE) );
LPC_UART1->THR = *BufferPtr;
#else
/* Below flag is set inside the interrupt handler when THRE occurs. */
      while ( !(UARTTxEmpty1 & 0x01) );
LPC_UART1->THR = *BufferPtr;
      UARTTxEmpty1 = 0;/* not empty in the THR until it shifts out */
#endif
}
BufferPtr++;
Length--;
}
return;
}
int main (void)
    {

           SetupUART_Location(0,0);
           UARTInit(0, 9600);
            while(1)
        {
            if ( UARTCount0 != 0 )
                {
                  LPC_UART0->IER = IER_THRE | IER_RLS;                      /* Disable RBR */
                  UARTSend( 0, "UARTONDONEOK" , 12);


                  UARTCount0 = 0;
                  LPC_UART0->IER = IER_THRE | IER_RLS | IER_RBR;    /* Re-enable RBR */
               }
         }
}

If i run this program I am getting junk data in my terminal.If i increase the character length,length of junk data too increases.I am using 12MHz clock.I suspect baudrate type issue.

Please check if i have gone wrong somewhere.

Thanks a lot.

Re: Reg:UART Library for LPC1227

lpcware — Wed, 15 Jun 2016 23:25:12 GMT

Content originally posted in LPCWare by Microembedded on Fri May 16 04:52:14 MST 2014
Thanks for your help.Problem got solved when i changed the value of LPC_UART0->DLL to 0x13.

topic Re: Reg:UART Library for LPC1227 in LPCXpresso IDE

Reg:UART Library for LPC1227

Re: Reg:UART Library for LPC1227