如何修复 'I2C communication between 2 microcontrollers intterupted by an intterupt'

Question

我正在用我的 Arduino Nano 制作调光器，它通过 I2C 从 ESP8266 控制器获取 0-128 之间的值。这在 nano 上工作正常，直到中断（零交叉检测）中断它。

我试过用电位器调光，效果很好，我试过在没有中断的情况下（在串行监视器中），效果很好。我也尝试用 sei() 和 cli() 替换中断和 noInterrupts 但没有结果。我有时确实让它工作了一会儿，但后来看起来像这样。

之后它停止工作。

下面是我的ESP8266设备代码（这是临时测试代码）。这只会将值发送到 nano。

#include <Wire.h>

void setup() {
  Wire.begin();
}

void loop() {
  for (int dimValue = 0; dimValue <= 128; dimValue++)
  {
    delay(50);
    Wire.beginTransmission(8);
    Wire.write(dimValue);
    Wire.endTransmission();
  }
}

下面是负责通过 I2C 调光和接收命令的 Nano 的代码。

#include <Wire.h>

int AC_LOAD = 8;    // Output to Opto Triac pin
int dimming = 128;  // Dimming level (0-128)  0 = ON, 128 = OFF
int zeroCross = 3; // zerocross pin

void setup()
{
  pinMode(AC_LOAD, OUTPUT);// Set AC Load pin as output
  attachInterrupt(digitalPinToInterrupt(3), zero_crosss_int, RISING);
  Serial.begin(115200);
  Wire.begin(8);
  Wire.onReceive(receiveEvent);
}

void zero_crosss_int()  //function to be fired at the zero crossing to dim the light
{
  int dimtime = (75 * dimming);  // For 60Hz =>65
  delayMicroseconds(dimtime);    // Wait till firing the TRIAC
  digitalWrite(AC_LOAD, HIGH);   // Fire the TRIAC
  delayMicroseconds(10);         // triac On propogation delay
  // (for 60Hz use 8.33) Some Triacs need a longer period
  digitalWrite(AC_LOAD, LOW);    // No longer trigger the TRIAC (the next zero crossing will swith it off) TRIAC
}

void loop()
{
}

void receiveEvent() {
  noInterrupts();
  int x = Wire.read();
  dimming = x;
  Serial.println(x);
  interrupts();
}

我应该从 nano 得到的结果应该是这样的

Answer 1

问题是中断处理程序忙了太久，中断了 I2C 接收处理，导致溢出。现在，通过将中断中的代码放入 loop().

中，它可以完全正常工作

#include <Wire.h>

int AC_LOAD = 9;    // Output to Opto Triac pin
int dimming = 128;  // Dimming level (0-128)  0 = ON, 128 = OFF
int zeroCross = 3; // zerocross pin
boolean triacFire = false;

void setup()
{
  pinMode(AC_LOAD, OUTPUT);// Set AC Load pin as output
  attachInterrupt(digitalPinToInterrupt(zeroCross), zero_crosss_int, RISING);
  Serial.begin(115200);
  Wire.begin(8);                // join i2c bus with address #8
  Wire.onReceive(receiveEvent); // register event
}

void zero_crosss_int()  //function to be fired at the zero crossing to dim the light
{
  triacFire = true;
}

void loop()
{
  if (triacFire == true)
  {
    int dimtime = (75 * dimming);  // For 60Hz =>65
    delayMicroseconds(dimtime);    // Wait till firing the TRIAC
    digitalWrite(AC_LOAD, HIGH);   // Fire the TRIAC
    delayMicroseconds(10);         // triac On propogation delay
    // (for 60Hz use 8.33) Some Triacs need a longer period
    digitalWrite(AC_LOAD, LOW);    // No longer trigger the TRIAC (the next zero crossing will swith it off) TRIAC
    triacFire = false;
  }
}

void receiveEvent() {
  noInterrupts();
  byte x = Wire.read();    // receive byte as an byte
  dimming = x;
  Serial.println(x);
  interrupts();
}

谢谢大家帮我解决这个问题！

如何修复 'I2C communication between 2 microcontrollers intterupted by an intterupt'

How to fix 'I2C communication between 2 microcontrollers intterupted by an intterupt'

arduino

interrupt

i2c