Hi!
I have a problem with the simultaneous use of an SD card (with SDIO) and the uart port with GSM module connected. The SD card works flawlessly all the time. Communication with the GSM module is very unstable when I use the SD card - using the f_mout function destabilizes the work of uart. GSM module work perfect without SD card mounted. What could be the reason for this?
I tested the DMA interrupt uart: the result was always the same: unstable operation of the GSM modem.
Hardware platform: STM32f429 discovery and SIM800L module
Software: CubeMX + HAL
Thank you very much
Regards
Maciek
