51模拟串口c语言程序

51模拟串口c程序


＃i nclude<reg52.h> 
＃i nclude<stdio.h>
sbit BT_SND =P1^0;
sbit BT_REC =P1^1;
/**********************************************
IO 口模拟232通讯程序
使用两种方式的C程序 占用定时器0
**********************************************/
#define MODE_QUICK
#define F_TM F0
#define TIMER0_ENABLE  TL0=TH0; TR0=1;
#define TIMER0_DISABLE TR0=0;
sbit ACC0=   ACC^0;
sbit ACC1=   ACC^1;
sbit ACC2=   ACC^2;
sbit ACC3=   ACC^3;
sbit ACC4=   ACC^4;
sbit ACC5=   ACC^5;
sbit ACC6=   ACC^6;
sbit ACC7=   ACC^7;
void IntTimer0() interrupt 1
{
 F_TM=1;
}
//发送一个字符
void PSendChar(unsigned char inch)
{

 #ifdef MODE_QUICK
 ACC=inch;
 
 F_TM=0;
 BT_SND=0;   //start bit
 TIMER0_ENABLE;  //启动
 while(!F_TM);
 
 BT_SND=ACC0;  //先送出低位
 F_TM=0;
 while(!F_TM);
 
 BT_SND=ACC1;
 F_TM=0;
 while(!F_TM);
 
 BT_SND=ACC2;
 F_TM=0;
 while(!F_TM);
 
 BT_SND=ACC3;
 F_TM=0;
 while(!F_TM);
 
 BT_SND=ACC4;
 F_TM=0;
 while(!F_TM);
 
 BT_SND=ACC5;
 F_TM=0;