I've got a busted consumer product here that has 2 #Holtek#microcontrollers in it. Either one would be sufficient to run this product (a brushless-motor tower fan), but #MCUs are cheap, so why not throw a second one in if it saves a few centimeters of wire?
I'm trying to determine if there's a #standard#serial#physical#layer in use here to communicate from one #MCU to the other. It's one-way communication.
I presume they've implemented the transmit with simple bit-banging a GPIO line.
I want to replace the secondary MCU with one of my own. I can implement the interface with just bit-banging, too, but if I don't have to - because it's a standard and someone has already written #code for the #RP2040 / Raspberry Pi Pico - then that would be great.
Anyone know if this is a standard I haven't found?