There's a known issue with NINA firmware on the SAM32v2.4 causing it to dominate the SPI bus. This causes intermittent issues with concurrent ESP32 and SD card access (for example).
Adafruit has designed a fix for their boards and the same fix will be implemented in SAM32v2.5. See pic below from the Airlift express for an example of properly putting the MISO pin into a tri-state using a buffer gate:
maholli
commented
4 years ago
There's a known issue with NINA firmware on the SAM32v2.4 causing it to dominate the SPI bus. This causes intermittent issues with concurrent ESP32 and SD card access (for example).
Adafruit has designed a fix for their boards and the same fix will be implemented in SAM32v2.5. See pic below from the Airlift express for an example of properly putting the MISO pin into a tri-state using a buffer gate: