serial.c

周立功arm7(lpc2104)的工程模板

// *********************************
// LPC2000 SYSTEM WITHOUT OS
// FILE:     SERIAL.C
// MODIFIED: ZPCYP 2005-3-16 20:16
// *********************************

/*
** This implements a simple (polled) RS232 serial driver.
**
** It outputs single characters on Serial Port 0,
** 8 bit, no parity, 1 stop bit.
**
** Initialize the port with init_serial_0() before calling sendchar().
**
** To monitor the characters output, use a null-modem cable to
** connect Serial Port 0 to an RS232 terminal or PC running a
** terminal emulator, e.g. HyperTerminal.
*/

#include "config.h"
#include "lpc22xx.h"
#include "main.h"

void init_serial_0(void)
{
  U0LCR = 0x83;                             // DLAB = 1

  U0DLM = (F_PCLK / 16 / UART0_BAUD) >> 8;  // Set baud rate
  U0DLL = (F_PCLK / 16 / UART0_BAUD) & 0xff;
  
  U0LCR = 0x03;                             // N, 8, 1


    //中断设置
 
  VICIntSelect = 0x00;//所有中断通道设置为IRQ中断
  VICVectCntl0 = 0x26;//定时器0中断通道分配最高优先级(向量控制器0)
 // VICVectAddr0 = (unsigned int)UART0_Receive;//中断入口地址 
  VICIntEnable = 0x00000040 ;//使能UART0中断
}


void sendchar(char *ch)
{
  while ((U0LSR & 0x40) == 0);

  if (*ch == '\n')                          // Replace line feed with '\r'
    *ch = '\r';

//  if (*ch == '\n') {
//    U0THR = '\r';
//    while ((U0LSR & 0x40) == 0);
//  }

  U0THR = *ch;                              // Transmit
}


int receivechar(void) {
  while ((U0LSR & 0x01) == 0);

  return U0RBR;
}