蓝桥杯 小蜜蜂 单元训练08：外部中断的基本操作

#include "stc15f2k60s2.h"

#define LED(x)                 \
    {                          \
        P0 = x;                \
        P2 = P2 & 0x1f | 0x80; \
        P2 &= 0x1f;            \
    }

#define L1 0xFE; // 定义L1亮灯
#define L8 0x7F; // 定义L8亮灯

sbit KeyS5 = P3 ^ 2; // 定义S5

typedef unsigned int uin8_t;

uin8_t interruptEnalbe = 0;
uin8_t workingStatus = 0;
uin8_t timerCounter = 0;
uin8_t timerSecCounter = 0;
uin8_t timerEnable = 0;
uin8_t timerSecEnable = 0;

void Working()
{
    switch (workingStatus)
    {
    case 0:
        LED(P0 & L1);    // L1灯亮
        if (timerEnable) // 灯闪烁需要时间间隔
            workingStatus = 1;
        timerEnable = 0;
        break;
    case 1:
        LED(P0 | 0x01); // L1灯灭
        if (timerEnable)
            workingStatus = 0;
        timerEnable = 0;
        break;
    default:
        workingStatus = 0;
        break;
    }
}
void LightLed8()
{
    LED(P0 & L8); // L8亮灯，同时不影响L1
}
void OffLed8()
{
    if (timerSecEnable)
    {
        LED(P0 | 0x80); // L8熄灭，同时不影响L1
        timerSecEnable = 0;
    }
}

void Timer0_Init(void) // 1毫秒@12.000MHz
{
    AUXR |= 0x80; // 定时器时钟1T模式
    TMOD &= 0xF0; // 设置定时器模式
    TL0 = 0x20;   // 设置定时初始值
    TH0 = 0xD1;   // 设置定时初始值
    TF0 = 0;      // 清除TF0标志
    TR0 = 1;      // 定时器0开始计时
    ET0 = 1;      // 使能定时器0中断
    EA = 1;
}

void INT0_init()
{
    IT0 = 1; // 上升沿还是下降沿
    EX0 = 1; // 使能打开
    EA = 1;  // 全局使能打开
}
void main()
{
    LED(0xff);

    INT0_init();
    Timer0_Init();

    while (1)
    {
        if (interruptEnalbe)
        {
            Working();
            OffLed8();
        }
    }
}

void INT0_ISR() interrupt 0
{
    if (KeyS5 == 0)
    {
        interruptEnalbe = 1;
        LightLed8(); // 这个可以写到外面，比如增加Led8Proc()函数，将LightLe8与OffLed8作为子函数调用。
    }
    else
        interruptEnalbe = 0;
}

void Timer0_Isr(void) interrupt 1
{
    if (++timerCounter == 50) // 50ms
    {
        timerCounter = 0;
        timerEnable = 1;
        if (++timerSecCounter == 60) // 3000ms ,3s
        {
            timerSecCounter = 0;
            timerSecEnable = 1;
        }
    }
}