printp.c

武汉大学参加飞思卡尔智能汽车大赛的小车程序

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


#define BD_9600   164   //24MHz时9600波特率
#define BD_19200  82

void sci_init(void){
/*  SCI0BD=BD_9600;
  SCI0CR1=0x04;   //9位数据位,无校验
  SCI0CR2_RE=1;
  SCI0CR2_TE=1;   //允许发送+接收
  SCI0CR2_RIE=1;  //接收中断
  SCI0CR2_TCIE=0; //禁止发送完毕中断
  */
   SCI0BD = BD_19200;//波特率19200
   SCI0CR1 = 0;//8位数据格式
   SCI0CR2=0X2C;
}

void sci_putchar(char data){
  while(!SCI0SR1_TDRE); //等待TDRE为1,发送保持器为空
  SCI0DRL=data;   //发送一个字符
}

void sci_prints(char* ctrl){
  for(;*ctrl;ctrl++){
    sci_putchar(*ctrl);
  }
}