在ARDUINO中使用定时器中断

1万 · 2023-6-30 22:15



#define LED_D4 12

#define LED_D5 13

#define BUTTON_BOOT 9

volatile bool ledState =false;

void timerISR()

{

  ledState = !ledState;

  digitalWrite(LED_D4, ledState);

}

hw_timer_t* timer = NULL;

// the setup function runs once when you press reset or power the board

void setup() 

{

  // initialize digital pin LED_BUILTIN as an output.

  pinMode(LED_D4, OUTPUT);

  pinMode(LED_D5, OUTPUT);

  digitalWrite(LED_D4, 0);  

  digitalWrite(LED_D5, 0);

//  pinMode(BUTTON_BOOT, INPUT);



  timer = timerBegin(0, 80, true);

  timerAttachInterrupt(timer, &timerISR, true);

  timerAlarmWrite(timer, 1000000, true);

  timerAlarmEnable(timer);

}



// the loop function runs over and over again forever

void loop() 

{

  // digitalWrite(LED_D4, HIGH);  // turn the LED on (HIGH is the voltage level)

  // delay(1000);                 // wait for a second

  // digitalWrite(LED_D4, LOW);   // turn the LED off by making the voltage LOW

  // delay(1000);                 // wait for a second



  // if(digitalRead(BUTTON_BOOT)==0)

  // {

  //   digitalWrite(LED_D5, 0);

  // }

  // else 

  // {

  //   digitalWrite(LED_D5, 1);

  // }

}

1万 · 2023-6-30 22:16

复制

#include <Arduino.h>



#define LED_D4 12



volatile bool ledState = false; // LED状态标志



// 中断服务程序

void timerISR()

{

  ledState = !ledState; // 切换LED状态

  digitalWrite(LED_D4, ledState); // 设置LED状态

}



// 将定时器中断服务程序注册到中断向量表

hw_timer_t* timer = NULL;

void setupInterrupt()

{

  timer = timerBegin(0, 80, true); // 使用定时器0，预分频器为80，计数上升沿触发

  timerAttachInterrupt(timer, &timerISR, true); // 将中断服务程序绑定到定时器

  timerAlarmWrite(timer, 1000000, true); // 设置定时器报警值为1000000，对应1秒的计时周期

  timerAlarmEnable(timer); // 启用定时器报警

}



void setup()

{

  pinMode(LED_D4, OUTPUT); // 设置LED引脚为输出模式

  setupInterrupt(); // 配置定时器中断

}



void loop()

{

  // 主程序代码

}