I want to use an SPI SDCard with my SARA AFF R412M.
The card is 5V powered and I am using the SD library with the default SS pin as CS.
Occasionally SD initialization fails and I need to restart the board. The actual problem though is that the SD card cannot be initialized at all while operating on LiPo battery.
Do I need any pull up resistors for SPI pins? Any ideas ?
Thank you in advance !