iar14-3slave.c

手把手教你学AVR单片机C程序设计实验程序

#include<iom16.h>
#define uchar unsigned char	//变量类型的宏定义
#define uint  unsigned int	
#define SPIF 7
#define xtal 8
uchar __flash SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,	
                0x6d,0x7d,0x07,0x7f,0x6f};
uchar __flash ACT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};	
uchar RXb[10];
uchar TXb[10]={9,8,7,6,5,4,3,2,1,0};
uchar i=0;
uchar S_flag=0;
/**********************************/
void Delay_1ms(void)		
{ uint i;
 for(i=1;i<(uint)(xtal*143-2);i++)
    ;
}
//=============================================
void Delay_nms(uint n)		
{
 uint i=0;
   while(i<n)
   {
    Delay_1ms();
    i++;
   }
}
/*******************************/
void port_init(void)
{
 PORTA = 0x00; 
 DDRA  = 0xFF;
 PORTC = 0xFF; 
 DDRC  = 0xFF; 
 PORTB = 0x10; 
 DDRB  = 0x40;
}
/*******************************/
void spi_init(void)
{
 SPCR = 0xC1; //setup SPI
 SREG|=0x80;
}
/*******************************/
void main(void)
{
  uchar cnt;
  port_init();
  spi_init();
  for(cnt=0;cnt<10;cnt++)
      {
        PORTA = SEG7[TXb[cnt]]; 
        PORTC = ACT[0];
        Delay_nms(500);	
      }
  Delay_nms(50);
  SPDR=TXb[0];
  while(1)
  { 
    if(S_flag==1)
    {
      for(cnt=0;cnt<10;cnt++)
      {
        PORTA = SEG7[RXb[cnt]]; 
        PORTC = ACT[0];
        Delay_nms(500);	
      }
    }
  }
}
/******************************/
#pragma vector=SPI_STC_vect
__interrupt void spi_stc_isr(void)
{
 RXb[i]=SPDR;
 if(i>=9){S_flag=1;goto end;}
 i++;
 SPDR=TXb[i];
 end:;
}