uart.c

基于飞利浦公司ARM7处理器

/*************************************************************************
 *
 *    Used with ICCARM and AARM.
 *
 *    (c) Copyright IAR Systems 2003
 *
 *    File name   : LPC_Uart.c
 *    Description : Define API for UART
 *
 *    $Revision: 1.1.6.1 $
 **************************************************************************/

#include "LPC2294.h"

/* Uart Interrupt Identification */
#define IIR_RSL                   0x3
#define IIR_RDA                   0x2
#define IIR_CTI                   0x6
#define IIR_THRE                  0x1

/*************************************************************************
 * Function Name: UART_Init
 * Parameters: void
 * Return: void
 *
 * Description: Initialize Uart, configure baut rate, frame format and FIFO
 *
 *************************************************************************/
void UART_Init(void)
{
  // Divisor = pclk / (16*bautrate)

/*** UART0 ***/
  // set bautrate: 38.4K bps
//  U0LCR_bit.DLAB = 1;			// DLAB = 1
  U0LCR = 0x83;
  U0DLM = 0;
  U0DLL = 90;
  // Set frame format: 8,N,1
  U0LCR = 0x3;	        		// DLAB = 0
  // Set FIFO
  U0FCR = 0x1;					// Rx Threshold = 1
  // Set Interrupt
  U0IER = 0x1;					// Enable Rx Int

  // Enable TxD0 and RxD0, bit 0~3=0101
  PINSEL0 |= 0x05;				// P0.0 and P0.1

/*** UART1 ***/
  // bautrate: 19.2K bps
//  U1LCR_bit.DLAB = 1;      	// DLAB = 1
  U1LCR = 0x83;
  U1DLM = 0;
  U1DLL = 180;
  // Set frame format: 8,N,1
  U1LCR = 0x3;              	// DLAB = 0
  // Set FIFO
  U1FCR = 0x1;					// Rx Threshold = 1
  // Set Interrupt
  U1IER = 0x1;					// Enable Rx Int

  // Enable TxD1 and RxD1, bit 16~19=0101
  PINSEL0 |= 0x50000;			// P0.8 and P0.9
}

/*************************************************************************
 * Function Name: UART0_ISR
 * Parameters: void
 * Return: void
 *
 * Description: Uart0 interrupt subroutine
 *
 *************************************************************************/
void __irq UART0_ISR(void)
{
  switch((U0IIR>>1)&0x7)
  {
  case IIR_THRE:  	// continue sending data

    break;
	
  case IIR_RSL:		// error manage
    
	break;
	
  case IIR_RDA:		// receive data
  case IIR_CTI:		// time out
  // read U0RBR;
	U0THR = U0RBR;	// send received data
    break;
	
  default:
    break;
  }
  VICVectAddr = 0;    // Clear interrupt in VIC.
}

/*************************************************************************
 * Function Name: UART1_ISR
 * Parameters: void
 * Return: void
 *
 * Description: Uart1 interrupt subroutine
 *
 *************************************************************************/
void __irq UART1_ISR(void)
{
  switch((U1IIR>>1)&0x7)
  {
  case IIR_THRE:  	// continue sending data
    
    break;
	
  case IIR_RSL:		// error manage
    break;
	
  case IIR_RDA:		// receive data
  case IIR_CTI:		// time out
  // read U1RBR;
    
	break;
	
  default:
    break;
  }
  VICVectAddr = 0;    // Clear interrupt in VIC.
}