GPS單片機(jī)每次發(fā)送少一到兩個(gè)字符怎么回事

ID:268520 · 發(fā)表于 2018-1-5 21:11

nclude<reg52.h>
#include<string.h>
unsigned char cntRxd = 1;
unsigned char cmdArrived = 0;
unsigned char bufRxd[69]; //串口接收緩沖區(qū)
void ConfigUART(unsigned int baud)//串口配置函數(shù)，baud為波特率
{
SCON = 0x50;//配置串口為模式1
TMOD &= 0x0F;//清零T1的控制位
TMOD |= 0x20;//配置T1為模式2
TH1 = 256 - (11059200/12/32) / baud;//計(jì)算T1重載值
TL1 = TH1;//初值等于重載值
ET1 = 0;//禁止T1中斷
ES= 1;//使能串口中斷
TR1 = 1;//啟動(dòng)T1
}
void UartWrite(unsigned char *buf) //串口發(fā)送函數(shù)
{
unsigned char i;
for(i = 0;i<cntRxd;i++)//發(fā)送數(shù)據(jù)
{
SBUF = *buf;
buf++;
}
}
void main ()
{
EA = 1;//開總中斷
ConfigUART(4800); //配置波特率為4800
while(1)
{
if (cmdArrived) //有命令到達(dá)時(shí)，讀取處理該命令
{
cmdArrived = 0;
UartWrite(bufRxd);
cntRxd = 0;
}
}
}
void InterruptUART() interrupt 4//UART中斷服務(wù)函數(shù)
{
if(RI)
{
bufRxd[cntRxd++] = SBUF; //保存接收字節(jié)
while(!RI);
RI = 0;//手動(dòng)清零接收中斷標(biāo)志位
cmdArrived = 1;
}
if (TI)//字節(jié)發(fā)送完畢
{
TI = 0;
}
}