main.c

单片机的串口通信协议

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include "RXDTXD.h"


//--------------------------------------------------------------------------------------------//

void  port (void)
{
  DDRD|=(1<<PD2);    //485  cs
  PORTD&=~(1<<PD2);  
  DDRB|=(1<<PB0);    //power 灯
  PORTB&=~(1<<PB0);  
  DDRD|=(1<<PD3);  
}



//--------------------------------------------------------------------------------------------
 main(void) 
{ 
  unsigned long int d=0,p[12],n=0,m=0;
  unsigned char aa=0,a[10]={1,2,3,4,5,6,7,8,9,10};
  port();     //端口初始化
  USART_Init(1);     //串口初始化
  TCNT0=250;    // 开始值250    计数器0初始化
  TCCR0=3;    // 预分频 ck/64
  TIMSK|=0x01;    //使能计数0
  sei();
   
  while(1) 
  {
   // aa=sum;
	
	if(recestlen==0)
	  {recestlen=0;
	   USART_send (bm,6);
	  }
  }  
}