This is for an embedded application. SPI support is optional on microSD, so I’m wondering if SanDisk’s offerings support SPI mode access.
If you want I send all my embedded source files to you about doing SPI-communcation with a micro-sd card, I implement additional retry mechanisme and so on.
Also if you haven´t and goes design your schematic provide a additional power off/on fet for the micro-sd.
Somethings the Sandisk is hanging and only a power off/on give a solution to get back in communication with de micro-sd
micro-sd cards from Samsung or other manufactors does have such problems in SPI-mode.