#include<reg52.h>
#include<string.h>
#define TBUF_SIZE 4
#define RBUF_SIZE 4
unsigned char tbuf[TBUF_SIZE];//发送缓冲区
unsigned char rbuf[RBUF_SIZE];//接收缓冲区
unsigned char r_head;
unsigned char t_head; //发送缓冲区的头计数器
unsigned char t_len; //要发送数据的长度
unsigned char temp = 0; //临时计数器
unsigned char remp = 0; //临时计数器
unsigned char count;
unsigned char code Ret[4] = "00ok";
unsigned char code Err[4] = "0err";
unsigned char rxdata[6];
bit rflag;
/*******串行口初化函数**************/
void com_initialize(void)
{
EA = 0;
t_head = 0; //清除接收和发送缓冲区
t_len = 0;
PCON = 0x00; //SMOD = 0
SCON = 0xD0; //串行口方式3,11位异步收发。允许接收,清除发送中断标志,清除接收中断村志
T2CON = 0x34; //0011,0100定时器2的溢出脉冲作串口发送时钟，和接收时钟.启动定时器2
#if 1
RCAP2H = 0x0ff; //22.1184MHz 单倍速9600
RCAP2L = 0x0b8;
#else
RCAP2H = 0x0ff; //22.1184MHz 双倍速9600
RCAP2L = 0x071;
#endif
ES=1; //允许串行中断/
TR2 = 1; //启动T2
EA = 1;
}
/*启动发送*/
void com_send_data(unsigned char *senddata, unsigned char len)
{
unsigned char i;
t_len = len; //发送的长度
for(i = 0; i < t_len; i++)
{
tbuf = senddata;
}
rflag = 0;
memset(rbuf,0,4);
TI = 1; //开始发送
}
unsigned char checksum(unsigned char *puInBuf, unsigned char puInBufLen)
{
unsigned char i;
unsigned char ucRet = 0;
for (i = 0; i <= puInBufLen-1; i++)
{
ucRet ^= puInBuf;
}
return(ucRet);
}
/*******************中断处理函数********************/
//串行口中断（完成数据的接收和发送）
void com_isr(void) interrupt 4 using 2
{
if(RI)
{
RI = 0;
rbuf[r_head++]=SBUF;
if(r_head == 4)
{
rflag =1;
r_head = 0;
}
/*ch=SBUF;
if(ch > 127)
{
rbuf[count++] = ch;
checksum = ch - 128;
}
else
{
rbuf[count++] = ch;
checksum ^= ch;
if((count == RBUF_SIZE)&&(!checksum))
{
rflag = 1;
count = 0;
}
}
*/
}
else if(TI)
{
TI = 0;
if(t_head >= t_len)
{
t_head = 0;
}
else
{
SBUF = tbuf[t_head++];
}
}
}
void main(void)
{
unsigned int i=10000;
unsigned char j;
com_initialize();
while(1)
{
if(rflag)//如果取数标志已置位，就将读到的数从串口发出
{
j = !checksum(&rbuf, 4);
switch(j)
{
case 0:
//P1 = rbuf[1];
com_send_data(&Err, 4);
while(--i);
break;
case 1:
P1 = rbuf[1];
com_send_data(&Ret, 4);
while(--i);
break;
default:break;
}
}
}
}
我的这个串口程序经常出现校验不正确！并且还经常丢数据。搞了一周还是没有结论！请各位高手指点小弟一下！！！ |
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