Since looking at the waveform generator, it occurred to me that a sampling scope wouldn’t be too difficult to pull together with existing PIO code and the logic analyzer binary interface mode.
AD9280 is a 32MSPS 8 bit ADC. They come on various development boards on aliexpress with a front-end attached.
- We only have 8 IO pins, so it would be 7 bits plus the clock signal.
- AD9280 has 1V and 2V measurement modes. I guess a front end would be an op-amp, a resistor divider and a second op-amp to scale 0-5V to 0-2V or 0-1V
I’m going to have a quick look to see whats in the Chinese market that might be cheap and available.