智能车制作

标题: 求教一个128小程序 [打印本页]

作者: 戥家三少 时间: 2014-2-25 18:47
标题: 求教一个128小程序
#include <hidef.h>    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */
#include <MC9S12XS128.h>

void SetBusCLK_32M(void)
{
CLKSEL=0X00;       //不是能锁相环时钟
PLLCTL_PLLON=1; //锁相环电路允许
SYNR =0x00|0x03;                      //fpllclock=2*osc*(1+SYNR)/(1+REFDV)=160MHz;
REFDV=0x80|0x01;                   //fbus=pllclock/2;
POSTDIV=0x00;                         //fpllclock=fvco/(2*POSTDIV)
_asm(nop);
_asm(nop);
while(!CRGFLG_LOCK);          //when pll is steady ,then use it;
CLKSEL_PLLSEL =1;             //engage PLL to system;
}

void Init_SCI(){
  SCI0BD = 208;             //设置波特率为9600 208  BUS32M
  SCI0CR1 = 0X00;             //正常的8位数据传送，无奇偶校验
  SCI0CR2 = 0X2C;             //发送允许，中断发送允许
}

void Init_PJ() {
  DDRJ = 0X00;//设为输入口

  PIEJ = 0Xc0;//开中断

  PPSJ = 0X00;//7口下降沿6口上升沿
}

void uart_putchar ( unsigned char c)
{

  while(!(SCI0SR1&0x80)) ;       //keep waiting when not empty
  SCI0DRL=c;
}

void main(void) {
  /* put your own code here */
  SetBusCLK_32M();
  Init_SCI();
  Init_PJ();

  uart_putchar(0x60);

EnableInterrupts;
  while(1);
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED

void interrupt 24 J_Inter(){
  if(PIFJ_PIFJ7 == 1) {
uart_putchar(0XFF);
PIFJ_PIFJ7 = 1;
  }
  else if(PIFJ_PIFJ6 == 1){
uart_putchar(0x00);
PIFJ_PIFJ6 = 1;
  }
}

#pragma CODE_SEG DEFAULT

我这个程序是想测试J口的中断捕捉功能，都是捕捉下降沿，但为什么有的时候能发开头的标志0X60，有时不能发，而且有时能捕捉，有时不能捕捉呢？

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