I am playing around with a few MCP4725 DACs, and I want to test them with higher I2C clocks (400MHz, 3,4Mhz), but I just cant get it work.
I tried using wire.Setclock() and then I tried editing the twi.h, twi.c file in the wire folder, but according to my scope, nothing changed.
It is always like 250-260kHz. (Also, why is it like that? Shouldnt it be around 100kHz?)
Any idea, what went wrong?
You mean the Wire.setClock() stuff?
I messed it up here, but it's okay in my code.
So I tried some other stuff.
For example, on my stm32 board I can change the clock frequency with Wire.setClock(). Comparing the two boards and the output signals of the DAC, it seems like the nano runs as 400kHz baseline. But it shouldn't. It's weird.