main.c

飞思卡尔的SPI程序 给初学者看的 学习交流

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"



void main(void) {
  /* put your own code here */
    DDRA=0xff;
  PORTA=0xf0;
   DDRB=0xff;
   
  SPI0BR=0x04;
  SPI0CR1=0x08;
  SPI0CR2=0x08;
  SPI0DR=0x00;
  SPI0SR=0x00;
  SPI0CR1=0x48;

  for(;;) { while((SPI0SR&(1<<7))==0);
  PORTB=SPI0DR;} /* wait forever */
  /* please make sure that you never leave this function */
}