I modified a SPI SD card adapter to work as SDIO, soldered to the back pins on the T4.
I cut the connections between some of the pins of the SD adapter, so now each pad goes exclusively to each pin. This was many times checked with a multimeter. Then I soldered cables (CAT5) from the adapter to the Teensy, following the normal pinout.
When I try example codes like CardInfo.ino I get the error "Initializing SD card...initialization failed!"
Any idea what might be happening? I checked the connections and there are no shorts between the pads. Some of them have a difference of a few hundreds ohm, which I assume is normal. My mind is turning in circles right now, below a few pics of my setup.
I cut the connections between some of the pins of the SD adapter, so now each pad goes exclusively to each pin. This was many times checked with a multimeter. Then I soldered cables (CAT5) from the adapter to the Teensy, following the normal pinout.
When I try example codes like CardInfo.ino I get the error "Initializing SD card...initialization failed!"
Any idea what might be happening? I checked the connections and there are no shorts between the pads. Some of them have a difference of a few hundreds ohm, which I assume is normal. My mind is turning in circles right now, below a few pics of my setup.