uart0.c

89c51模拟串口通信程序。通过串口上传后下载数据。

#include "reg51.h" //
#define SYSCLK 11059200
#define BAUDRATE 9600



void UART1_Init (void);
void SEND (void);
void RECEIVE(void);
 unsigned char k[10];
 sbit P2_7=P2^7;
void main (void) 
{
   int i;
   UART1_Init ();                      // initialize UART0

while(1)  
  {
  SEND ();
  for(i=0;i<1250;i++);
  P2_7=!P2_7;
  
   }
 // RECEIVE();
while(1);


}



void UART1_Init (void)
{
   TMOD    = 0x20;                     // TMOD: timer 1, mode 2, 8-bit reload
   TH1    = 253;                      // set Timer1 reload value for baudrate
   TL1    = 253;
   TR1    = 1;                         // start Timer1
   //SCON   |= 0x50;                     // SCON1: mode 1, 8-bit UART, enable RX
   SCON   = 0x50;
   //PCON   |= 0x80;                      // SMOD00 = 1
   PCON   = 0x00;                      // SMOD00 = 1
}
void SEND (void)
{
unsigned int j=0;
for(;j<=255;j++)
   {
    SBUF=j;
	 
while (!TI);
    TI=0;
    }
 
}
void RECEIVE(void)
{
  unsigned char i=0;
 //for(i=0;i<256;i++)
  //{
  //	while(!RI);
  //	i=SBUF;
  //	RI=0;
  // } 
    
  
  //SCON&=0xFE;
 while(i<10) 
  {
  RI=0;
  while (!RI);    //?????????????????
  k[i++]=SBUF;
}
  

}