main.c

使用摩托罗拉PC9SDG128B单片机开发具有SPI串行通讯功能的设备

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */


#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"


void SPI_Init(void) {
  SPI0CR1=0x54;
  SPI0CR2=0x18;
  SPI0BR=0x07;
  SPI0SR=0xB0;
}


void SPI_SendByte(unsigned char dat) {
  SPI0DR=dat;
  while((SPI0SR&0x80)==0); 
}


void main(void) {
unsigned int index;
unsigned int cnt,i;
unsigned char distab[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
DDRB=0xff;
PORTB=0xfe;
									 
SPI_Init();
   for(;;) {
      if(index>7) {
        index=0;
      }
SPI_SendByte(distab[index++]);
    for(cnt=0;cnt<1000;cnt++){
      i=1996;
      while(i--); 
    }
   }
}