Tufty2040 SDIO SD card

Support
#1

I’d like to use the Adafruit SDIO SD breakout with the Tufty2040. The pads on the back have SWC and SWD, but I’m wondering if I can repurpose INT as a data pin. Is i2c_int doing something important on the Tufty2040?

#3

Responding to my own post: I tried it, it’s not practical.

  1. SWD and SWC are dedicated programming pins, you can not repurpose them
  2. The rest of the pins do expose SPI0 pins however…
  3. SPI0 SCK is connected to the LCD backlight control pin on GPIO2, and the only other pin it can be mapped to is also in use by the LCD 8-bit interface
  4. To use GPIO2 you would have to cut very small traces and re-route SCK to the SD card adapter and then map either the RX or SCL pad to the backlight control pin

tl;dr don’t buy a Tufty2040 if you need to use an SD card.