uart.c

来自「nrf24e1的有关UART的驱动程序」· C语言 代码 · 共 73 行

#include <reg24e1.h>
/*  LED1-LED4  */
sbit LED1      = P0^7;
sbit LED2      = P0^6;
sbit LED3      = P0^5;
sbit LED4      = P0^4;
volatile unsigned char BUF;
void Delay100us(volatile unsigned char n)
{
    unsigned char i;
    while(n--)
        for(i=0;i<35;i++)
            ;
}

void Delayms(volatile unsigned char n)
{
    unsigned char j;
    while(n--)
        for(j=0;j<10;j++)
	    	Delay100us(10);

}
void InitUart(void)
{
    P0_ALT=0x06;
	P0_DIR=0x06;
    T2CON   = 0x34;      /* Use Timer 2 as baudrate generator  */
    RCAP2H  = 0xFF;
    RCAP2L  = 0xF7;      /* 57600 baud @ 16MHz                  */
    SCON    = 0x50;      /* enable serial uart & receiver      */
	ES=1;
    EA=1;
	}
void SendCh(unsigned char b)
{
	TI = 0;
	SBUF = b;
	while(!TI);
	TI = 0;
}

void UartISR (void) interrupt 4 using 2			//串口中断
{
   EA=0;
   if(RI)
  { 
   BUF=SBUF;
   LED1=0;
   Delayms(20);
   LED1=1;
   RI=0;
   }
   if(TI)
   TI=0;
   EA=1;
   }

void main(void)
{
   InitUart();
   while(1)
 {
    //SendCh(0xAA);
	if(BUF=0xBB)
   {
	P0=0x0F;
	Delayms(20);
	P0=0xFF;
      }
	}
  }