中断时 Arduino 不会睡觉运行

Question

我写了一个用风速计测量风速的小脚本。我想测量 2 秒而不是睡眠 8 秒...

如果没有风，睡眠工作正常，但是当风速计旋转时，arduino 不会进入睡眠状态。无论如何，我将如何修复我的代码以进入睡眠状态。

这是我的代码..

#include "LowPower.h"

const byte interruptPin = 3;  // anemomter input to digital pin
volatile unsigned long elapsedTime = 0;
int interval;
long WindAvr = 0;       // sum of all wind speed between update
int measure_count = 0;  // count each mesurement
unsigned int WindSpeed;

void setup() {
    Serial.begin(9600);
    attachInterrupt(
        digitalPinToInterrupt(interruptPin), anemometerISR,
        FALLING);  // setup interrupt on anemometer input pin, interrupt will
                   // occur whenever falling edge is detected
}

void loop() {
    WindAvr = 0;
    measure_count = 0;
    sei();        // Enables interrupts
    delay(2000);  // Wait x second to average
    cli();        // Disable interrupts
    LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);

    WindSpeed = WindAvr / measure_count;
    Serial.println(WindSpeed);
}
void anemometerISR() {
    cli();  // Disable interrupts
    static unsigned long previousTime = 0;
    unsigned long time = millis();

    if (time - previousTime > 15) {  // debounce the switch contact.
        elapsedTime = time - previousTime;
        previousTime = time;

        if (elapsedTime < 2000) {
            interval = (22500 / elapsedTime) * 0.868976242;
            WindAvr += interval;  // add to sum of average wind values
            ++measure_count;      // add +1 to counter

        } else {
            ++measure_count;  // add +1 to counter
        }
    }

    sei();  // Enables interrupts
}

Answer 1

外部中断 - 一旦 'un-masked' - 能够唤醒设备，即使使用 cli().

取消设置全局 I 标志也是如此

改变

cli();        // Disable interrupts
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);

到

detachInterrupt(digitalPinToInterrupt(interruptPin));
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
attachInterrupt(digitalPinToInterrupt(interruptPin), anemometerISR, FALLING);

另外...我认为您在 ISR 中的 cli() 和 sei() 语句是不必要的。全局中断使能位在进入/退出 ISR 时自动禁用/启用。来自 Atmega644 手册：

When an interrupt occurs, the Global Interrupt Enable I-bit is cleared and all interrupts are disabled. The user software can write logic one to the I-bit to enable nested interrupts. All enabled interrupts can then interrupt the current interrupt routine. The I-bit is automatically set when a Return from Interrupt instruction – RETI – is executed.

中断时 Arduino 不会睡觉运行

Arduino not going to sleep when interrupt running

sleep

arduino

中断时 Arduino 不会睡觉 运行

Arduino not going to sleep when interrupt running

sleep

arduino

中断时 Arduino 不会睡觉运行