Square Wave Generation on Portenta with Tone()

Official Hardware Portenta Family Portenta H7
1

Dear all,

I've been trying to generate a square wave using the tone() function on the Portenta using the Breakout Board. In particular, I am using GPIO pin 5, which only works if I use the alternative pin name of PG_3 as pointed out by @jerteach on Github back in March.

void setup() {
  pinMode(PG_3, OUTPUT); //set pulse pin
  pinMode(PG_10, OUTPUT); //reset pulse pin

}

void loop() {

  tone(PG_3, 1000); //square wave generated on GPIO pin 5 with frequency 1 kHz; 50% duty cycle
   
}

The code compiles and uploads successfully, but all I get are four short red LED blinks followed by four long LED blinks. I take it that tone() is not supported by the Portenta?

All the best,
Ryan

2

I'm not certain what your issue is, but the mbed Arduino core which is used by the Portenta H7 certainly contains tone().

https://github.com/arduino/ArduinoCore-mbed/tree/master/cores/arduino

https://github.com/arduino/ArduinoCore-mbed/blob/master/cores/arduino/Tone.cpp

3

Now you can use this new library to generate Square Wave.

For example, this TimerInterruptTest creates a square wave at pin D5 of Portenta_H7