#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;
}
