AnalogRead not working after AnalogAudioStream begins

[mageeagle]

I am trying to get values from a mic while recording with it.
I start the audio stream in setup, while putting analogRead in loop
when the audio stream begins, analogRead will not work and cause the loop to stop
Wonder if there is a workaround on this? Such as if it's possible to get the value of the audio stream like analogRead?

[pschatzmann]

You would copy the data from the AnalogAudioStream to a MultiOutput.
https://github.com/pschatzmann/arduino-audio-tools/wiki/Splitting-and-Merging-Audio

If you only want to read the audio data from the AnalogAudioStream you can call readBytes(buffer, size); to get the data from the input stream.

[mageeagle]

I would like to just read the audio data from the stream, since I'm working with a distance sensor which has delays that does not work when the copier is running with .copy(), but I'm not sure what (buffer and size) would fit into the function?

[pschatzmann]

https://github.com/pschatzmann/arduino-audio-tools/wiki/Introduction
If you use bits_per_sample=16 you can just cast the buffer to int16_t* to read the values. If you want to process a single sample it would be readBytes(buffer,2);
Just be aware, this is audio, so you get a lot of data that you need to process in a short period of time to avoid buffer overflows. You can control the amount of data by setting the sample_rate.

If you have some steps with big delays in the loop you can try to execute them only every nth time.
Or as an alternative you can start a separate task.

[mageeagle]

I'll look into the readBytes

But on the topic, for instance, I wired the mic output to another pin for analogRead, but simply calling analogRead stops the code from running, even if I add an nth-time thing in the loop:

int incre = 0;
void loop() {
copier.copy();
incre++;
if (incre > 100) {
Serial.println(analogRead(PIN_NUMBER));
incre = 0;
}
}

I think digitalWrite also don't work in this case as well: for the distance sensors, I thought the delay here is actually slower than the sample rate
// Clear the trigPin by setting it LOW:
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
// Trigger the sensor by setting the trigPin high for 10 microseconds:
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Read the echoPin, pulseIn() returns the duration (length of the pulse) in microseconds:
duration = pulseIn(echoPin, HIGH);
// Calculate the distance:
distance = duration * 0.343 / 2;

But the distance sensor is a bit off topic, but just to show some stuff doesn't work while the copier is doing its thing

Sorry I'm kind of a beginner on this! Thanks for your patience.

[pschatzmann]

An analogRead() should be fast and should not disturb.
The print however is very bad!
I am not sure if activating analog input via I2S might lead to any other conflicts...

[mageeagle]

I made a simple mistake by calling analogRead with a small delay in loop, hence it's blowing up
I didn't know the loop() is running at such a high speed, it was fixed by pushing the increment to a much higher number!

But indeed, when a pin is in use by AnalogAudioStream, the pin will not be available for analogRead and the whole code will not run for some reason.

[mageeagle]

Another observation is, after AnalogAudioStream started, if there are analogReads afterwards, no matter which pin it is from, it would stop the analog stream... copying from the stream results in a blank sound file...

[pschatzmann]

espressif/arduino-esp32#4782

[mageeagle]

Thanks, I didn't notice that my ESP32 library is very outdated. I don't have the means to test the code again, but I assume that it should be fine once I update my library, I'll reopen this issue if needed.