atmega8atmega16communication.c

ATmega8与ATmega16相互之间通信

#include <iom16v.h>
#include <macros.h>
#include <eeprom.h>

/* PIN define */
#define MAX485_TXD() (PORTD |= (1<<2))
#define MAX485_RXD() (PORTD &= ~(1<<2))

void package_send_data(unsigned char data_1,unsigned char data_2);/*,unsigned char data_3,unsigned char data_4);*/
void DELAY_S(unsigned char time);

void DELAY_S(unsigned char time)//X*1MS
{
unsigned char x1,x2;
for(x2=0;x2<time;x2++)
 {WDR(); 
 for(x1=0;x1<255;x1++)
  {
  asm("nop");
  asm("nop");
  asm("nop"); 
  asm("nop"); 
  }
 }
}


void package_send_data(unsigned char data_1,unsigned char data_2)/*unsigned 
char data_3,unsigned char data_4)*/
{ 
 UCSRB&=~(1<<RXCIE);//禁止接受中断	 
 MAX485_TXD();  
 
 DELAY_S(1);
 while (!(UCSRA&(1<<UDRE)));//top--------1
 UDR=0xaa;
 while (!(UCSRA&(1<<UDRE)));//top--------2
 UDR=0xaa;
 while (!(UCSRA&(1<<UDRE)));//address-----3
 UDR=data_1;
 while (!(UCSRA&(1<<UDRE)));//address_back-----4
 UDR=data_2;
 while (!(UCSRA&(1<<UDRE)));//answer=0xff-----5
 UDR=0xff; 
 /*while (!(UCSRA&(1<<UDRE)));//data_1-----6
 UDR=data_3; 
 while (!(UCSRA&(1<<UDRE)));//data_2-----7
 UDR=data_4; 
 while (!(UCSRA&(1<<UDRE)));//data_2-----8*/
/* UDR=(data_1+data_2+0xff); /*+data_3+data_4);*/   
 DELAY_S(20);//19200DELY  7  
 MAX485_RXD(); 
 UCSRB|=(1<<RXCIE);//开接受中断
}

void main(void)
{
 CLI();
 DDRB  =  0B11100011;
 PORTB =  0B00111100;
 DDRD  =  0B11110100;
 PORTD =  0B10011111; 
  //串口初始化
 UCSRB=(1<<RXEN)|(1<<TXEN)|(1<<RXCIE);//允许发送和接收 
 UBRRL = 47; 
 UBRRH = 0;
 UCSRC=(1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);//8位数据+1位STOP位
 while(1)
 {
 if(!(PINB&0B00000100))
 {
  DELAY_S(200);
  if(!(PINB&0B00000100))
  {
  unsigned char address = 0x01;
  package_send_data(address,0x34); /*,CAMREA_NO,POSITION);}*/
  }
 }
}
}