c语言

ID:81472 · 发表于 2015-5-29 13:49

#include "uart.h"

unsigned char ostart;
unsigned char oend;
char idata outbuf[OLEN];

unsigned char istart;
unsigned char iend;
char idata inbuf[ILEN];
bit bdata sendfull;
bit bdata sendactive;

/*串行中断服务程序*/
static void com_isr(void) interrupt 4 using 1       //串口中断
{
//-------------接收数据中断--------------
  char c;
  if(RI)
  {
c=SBUF;
RI=0;
if(istart+ILEN!=iend)
{
   inbuf[iend++&(ILEN-1)]=c;
}
  }

  //-------------发送数据中断--------------
  if(TI)
  {
TI=0;
if(ostart!=oend)
{
   SBUF=outbuf[ostart++&(OLEN-1)];
   sendfull=0;
   }
   else
   {
      sendactive=0;
   }
}
}

//PUTBUF: 写字符到SBUF或发送缓冲区
void putbuf(char c)
{
if(!sendfull)
{
   if(!sendactive)
   {
      sendactive=1;
      SBUF=c;
   }
   else
   {
      ES=0;
      outbuf[oend++&(OLEN-1)]=c;
      if(((oend^ostart)&(OLEN-1))==0)
      { sendfull=1;}
      ES=1;
   }
}
}

//替换标准库函数putchar程序
//printf函数使用putchar输出一个字符
char putchar (char c)
{
  if (c=='\n')
{
   while(sendfull);
   putbuf(0x0D);
}
  while(sendfull);
  putbuf(c);
  return(c);
}

//替换标准库函数_getkey程序
//getchar和gets函数使用_getkey
char _getkey(void)
{
  char c;
  while(iend==istart)
  {;}
  ES=0;
  c=inbuf[istart++&(ILEN-1)];
  ES=1;
  return(c);
}

/* 初始化串行口和UART波特率函数*/
void com_initialize(void)
{
  istart=0;
  iend=0;
  ostart=0;
  oend=0;
  sendactive=0;
  sendfull=0;

  TMOD |=0x20; //T/C1工作在方式2
  TH1=0xfd;
  TR1=1;
  SCON=0xd8;
  ES=1;
}

void uart_Init()
{
  com_initialize();
  EA=1;
}