標(biāo)題: RS485串口通信C程序 [打印本頁(yè)]
作者: axy1    時(shí)間: 2017-4-25 22:43
標(biāo)題: RS485串口通信C程序
#include <reg51.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit P12=P1^2;
char code str[] = "you are the best! \n\r";

void main()
{
uint j;
TMOD=0x20;
TL1=0xfd;
TH1=0xfd;
SCON=0x50;
PCON &= 0xef;
TR1=1;
IE=0x00;
P12=1;
while(1)
{

uchar i=0;
while(str[i]!='\0')
{
SBUF=str[i];
while(!TI);
TI=0;
i++;
}

for(j=0;j<50000;j++);
}
}

作者: dzbj    時(shí)間: 2017-4-25 22:49
樓主這個(gè)不能叫通訊程序 應(yīng)該叫發(fā)送程序 P12是485芯片的使能控制吧 一直拉高只能發(fā)送 沒有拉低沒法接收



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