UART1

#include "uart.h"


#define UART_BUF_MAX 10
unsigned char uart_buf[UART_BUF_MAX];
unsigned char uart_in,uart_out;
/*32MHz系统时钟
**
*/
void Uart_Init(unsigned long baudrate)
{
 P0SEL |= BV(2) | BV(3);
 U0CSR |= BV(7);
 switch (baudrate)
 {
 case UART_BAUDRATE_115200:
    U0GCR = 11;
    U0BAUD = 216;
    break;
 case UART_BAUDRATE_19200:
    U0GCR = 9;
    U0BAUD = 59;
    break;
 case UART_BAUDRATE_9600:
    U0GCR = 8;
    U0BAUD = 59;
    break;
 default: //115200
    U0GCR = 11;
    U0BAUD = 216;
    break;
 }
 UTX0IF = 0;
 U0CSR |= BV(6);
 URX0IE =1;
 EA = 1;

 uart_in = 0;
 uart_out = 0;
 
}

void Uart_String(char *p)
{
  while(*p !=0)
  {
    U0DBUF = *p++;
    while(!UTX0IF);
    UTX0IF = 0;
  }
}
bool get_uart_data(unsigned char *p)
{
  if (uart_in == uart_out) return false;
  p[0] = uart_buf[uart_out++];
  uart_out = uart_out%UART_BUF_MAX;
  return true;
}
void send_uart_data(unsigned char *p,unsigned char len)
{
    U0DBUF = *p++;
    while(!UTX0IF);
    UTX0IF = 0;
}
#pragma vector=URX0_VECTOR
__interrupt void URX0_ISR(void)
{
  uart_buf[uart_in++] = U0DBUF;
  uart_in = uart_in%UART_BUF_MAX;
  URX0IF = 0;
}
//头文件==========================================================
#ifndef __UART_H__
#define __UART_H__

#include "all.h"




#define UART_BAUDRATE_115200    (115200)
#define UART_BAUDRATE_19200      (19200)
#define UART_BAUDRATE_9600      (9600)

void Uart_Init(unsigned long baudrate);

void send_uart_data(unsigned char *p,unsigned char len);
void Uart_String(char *p);
bool get_uart_data(unsigned char *p);




#endif

//例子==========================================================

#include "all.h" 
#include "led.h"
#include "uart.h"

void main(void)
{   
  unsigned char data;
  CLKCONCMD &= ~0x40;               //设置系统时钟源为32MHZ晶振
  while(CLKCONSTA & 0x40);          //等待晶振稳定
  CLKCONCMD &= ~0x47;               //设置系统主时钟频率为32MHZ   


  char p_buf[]="hello world\r\n";
  InitGPIO();
  Uart_Init(UART_BAUDRATE_115200);
  Uart_String(p_buf);
  while(1)                     //死循环
  {
    if (get_uart_data(&data))
    {
        switch(data)
        {
        case 'a'://open led
            LED1 = 1;
            Uart_String("a\r\n");
          break;
        case 'b'://close led
            LED1 = 0;
            Uart_String("b\r\n");
          break;
        default:
          break;
        }
    }
  }    
}