If you only need an SD Card reader you can probably use an RP2040 as a UART to SD Card bridge.I am looking into making a HAT for a Raspberry Pi 4. I am looking to add a second SD card reader without using external ports or external devices but adding a second USB interface.
It can potentially be a USB Host, controlled via UART, as well but you would have check if TinyUSB, Pico-PIO-USB, or whatever, supports that, supports adding a USB Card Reader.
One advantage of going the RP2040 route is you can prototype with a Pico before committing to a HAT design.
Statistics: Posted by hippy — Fri Feb 02, 2024 5:52 pm
