I've been working on a minimalist digital Oscillosocope based on a Raspeebrry Pi Pico and I need a way of generating AF (audio frequency) waveforms to test it with.
Yesterday I set up a very simple function generator which (I hope) produces a sine wave output. It uses the Pico's PIO capability and it's based on a hacked version of one of the PIO MicorPython demos.
I have a Bitscope micro USB-based oscilloscope which I am going to use to test the function generator.
I'll update this gist as I go, and will publish the code here once I know it's working.
Aand it works! Code below.
I will add a couple of potentiometers so I can vary frequency and amplitude.
Reading analogue signals has strange effects, and I think I may need to use _thread.
More soon.
I have a potentiometer controlling frequency running in a thread. It works fiune upto about 2 kHz. This has been fun, hence the name :) but I really need a wider range of frequencies to test the Pi Pico 'Scope code.
I've ordered an external ADC and will see if that will give me what I want..