标题: 请教一下如何把这个msp430程序改成倒计时的程序 [打印本页]

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作者: SuperJcl    时间: 2020-6-1 10:02
标题: 请教一下如何把这个msp430程序改成倒计时的程序

#include"msp430x24x.h"

#define CPU_F((double)1000000)

#definedelay_us8M(x) __delay_cycles((long)(CPU_F*(double)x/1000000.0))

#definedelay_ms8M(x) __delay_cycles((long)(CPU_F*(double)x/1000.0))

#define ucharunsigned char

#define uintunsigned int

#define KEYIN(P1IN&BIT0)

//共阳极数码管 "0-9"

ucharSEG[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

int sec = 0, min= 0;

char flag =0xff;//默认开启秒表

chardisplay_flag = 0x00;

voidinit_seg_port(void);//port2 port3

voidinit_exti_port(void);

void display(intsec, int min);

#pragma vector =PORT1_VECTOR

__interrupt voidPORT1_ISR(void){

  if(KEYIN == 0){

    delay_ms8M(20);

    flag = ~flag;

    delay_ms8M(5);

    if(!flag){

      TACCTL0 &= ~CCIE;//中断失能，关闭

    }else{

      TACCTL0 |= CCIE;//开启

    }

  }

  P1IFG = 0;

  delay_ms8M(5);

}

#pragma vector =TIMERA0_VECTOR

__interrupt voidTIMER0_ISR(void){

  sec++;

  display_flag = ~display_flag;

  if(sec == 60){

    sec = 0;

    min++;

  }

}

int main(void)

{

  // Stop watchdog timer to prevent time outreset

  WDTCTL = WDTPW + WDTHOLD;

  init_seg_port();

  init_exti_port();

  TACCTL0 |= CCIE;//

  TACCR0 = 32768;

  TACTL = TASSEL_2 + MC_1;//ACLK  连续计数模式

  _EINT();//开启总中断

  while(1){

    display(sec, min);

  }

  return 0;

}

voidinit_seg_port(void){

  P2DIR = 0XFF;

  P2OUT = SEG[0];

  P3DIR = 0XFF;

  P3OUT = 0X00;

}

void init_exti_port(void){

  P1DIR &= ~BIT0;

  P1IES |= BIT0;

  P1IE |= BIT0;

  P1IFG &= ~BIT0;//清0复位

}

void display(intsec, int min){

  //数码管显示字数缓存

  uchar buf[] = {0, 0, 0, 0};

  buf[0] = sec%10;

  buf[1] = sec/10%10;

  buf[2] = min%10;

  buf[3] = min/10%10;

  P2OUT = SEG[buf[0]];

  P3OUT = 0x08;

  delay_ms8M(1);

  P2OUT = 0xff;// 将P2端恢复成0xoff如果没有这个代码会显示错误  

  P2OUT = SEG[buf[1]];

  P3OUT = 0x04;

  delay_ms8M(1);

  P2OUT = 0xff;

  P2OUT = SEG[buf[2]];

  P3OUT = 0x02;

  delay_ms8M(1);

  P2OUT = 0xff;

  P2OUT = SEG[buf[3]];

  P3OUT = 0x01;

  delay_ms8M(1);

  P2OUT = 0xff;

}

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作者: f556    时间: 2020-6-1 15:50
先对sec min给初值，把
sec++;  min++;改为--

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