serial.c

15寸

#include <at89x51.h>

extern unsigned char command,recommand;

extern bit receiveFlag;

void serial(void)
{
	unsigned char i, j,k;
	receiveFlag = 0;
//	SCON  = 0x0e0;                      /* mode 1: 8-bit UART, 					*/
	TMOD  = 0x20;                       /* timer 1 mode 2: 8-Bit reload         */
	TH1   = 0x0f3;                      /* reload value 2400 baud               */
	TL1	  = 0x0f3;
	PCON  = 0x00;
	TR1   = 1;                          /* timer 1 run                          */
	
	SBUF = command;
	while(~TI){}
	TI = 0;
	REN = 1;
	for(k=0; k<20 ; k++)
	{
		for(j= 0; j<255 ; j++)
		{
			for(i=0;i<255;i++)
			{
				if(RI)
				{
					RI = 0;
					recommand = SBUF;
					receiveFlag = 1;
					return;
				}
			}
	   }
   }
	RI=0;
}