[ESP32] Problems using IRremote and Hardware-based PWM at the same time

MorpheusDe97 commented 5 years ago

Version/revision of the library used

v2.6.3

Actual behavior

When I use the bare library, everything works as expected. But as soon, as I activate some hardware-based PWM on a completely other pin to dim a LED, this library does not work as expected anymore. The IR-LED just seems to light continuously.

Steps to reproduce the behavior

I have the following setup: ESP32 with

an IR-LED (driven by an NPN transistor) on PIN 32
an RGB-LED on Pins 18, 19 and 21

As soon, as I activate the PWM on Pins 18, 19 and 21 using

        ledcSetup(PWM_CHANNEL_RED, PWM_FREQUENCY, PWM_RESOUTION);
    ledcSetup(PWM_CHANNEL_BLUE, PWM_FREQUENCY, PWM_RESOUTION);
    ledcSetup(PWM_CHANNEL_GREEN, PWM_FREQUENCY, PWM_RESOUTION);
    ledcAttachPin(LED_RED_PIN, PWM_CHANNEL_RED);
    ledcAttachPin(LED_BLUE_PIN, PWM_CHANNEL_BLUE);
    ledcAttachPin(LED_GREEN_PIN, PWM_CHANNEL_GREEN);
    ledcWrite(PWM_CHANNEL_RED, HighRedDutyCycle);
    ledcWrite(PWM_CHANNEL_GREEN, HighDutyCycle);
    ledcWrite(PWM_CHANNEL_BLUE, HighDutyCycle);

I can see the infrared LED sending continiously. I know that this library is timerInterrupt-based. But is there the possibility, or a known issue that there may appear unwanted interferences between using hardware-PWM and Infrared-sending?

crankyoldgit commented 5 years ago

Actually, the library doesn't use any of the Interrupts or Timers on the sending side. They are only utilised for receiving. Thus, I think your problem may be more fundamental.

There are no known issues with sending on the ESP32 platform, but ESP32 support is only new so there is a possibility you are the first to encounter it.

Re: https://github.com/markszabo/IRremoteESP8266/wiki/Troubleshooting-Guide#sending-an-ir-signal

How certain are you your hardware circuit is correct? The LED should most certainly be off almost all of the time.
Have you used the simple sending example code? Does it work as expected?
Are you invoking the library correctly? e.g. correct pin. Calling irsend.begin() before you send the first time etc.
What troubleshooting steps have you taken?
Can you simplify your code to the smallest possible example that demonstrates your problem and post it here?

crankyoldgit commented 5 years ago

Chasing up on this. Any progress?

crankyoldgit commented 5 years ago

Another friendly chase up.

MorpheusDe97 commented 5 years ago

Hello, sorry for the late reply! Using a completely new Arduino project running just your example-code and adding the pwm-functions to it, everything works like a charm. Probably, there was any kind of different problem as I directly tried to embed your library into a quite big project. I'll dig a bit deeper into the topic, but currently, it seems like the issue I came across is not caused by your library! I'll keep you updated as soon as I know something new.

crankyoldgit commented 5 years ago

Phew! I'll mark this issue closed for now then. Thanks for getting back to me.

crankyoldgit / IRremoteESP8266