Problem:
- Inserting a µSD card causes RadioLib to hit a critical error and reboot
- Device enters a boot loop as the SD card remains inserted
Reproduction:
- Insert a µSD card and power on
- RadioLib reports a critical error on boot
- Device reboots, repeating indefinitely
Root cause:
- On T-Lora Pager, SX1262 and the µSD slot share the same physical SPI bus
(same SCK/MOSI/MISO pins, differentiated only by CS)
- SDCARD_USE_SPI1 is intended for boards where SD is on a separate SPI bus;
it initializes a second ESP32 SPI peripheral (SPI3) for SD
- SPI2 is already driving those same pins for LoRa, so both controllers
simultaneously drive the same GPIO lines, causing bus contention
Fix:
- Remove SDCARD_USE_SPI1 so both devices share a single SPI peripheral (SPI2),
with CS pins providing device selection as intended
- Tested on a custom fork of device-ui; LoRa and SD card map tiles both work
correctly with an SD card inserted
Signed-off-by: Andrew Yong <me@ndoo.sg>
Andrew YongandGitHub
959756abf1