STM32 SPI microSD Guidance

I’m putting together an STM32-based design and need clear, working guidance on driving a microSD card over SPI. My end goal is solid, repeatable read-and-write access to a FAT32 volume inside my firmware, and I’d like to lean on the FatFs library.

What I need from you
• A concise, well-commented C example that shows the full flow: card initialisation, mounting with FatFs, buffered reads, buffered writes and a clean unmount.
• Explanations—short but precise—of the timing constraints, clocking choices and signal-integrity quirks that typically trip people up (especially when pushing speed).
• Tips for handling card-to-card variations, sector alignment, power-up delays and anything else that can corrupt data if ignored.
• A quick README or markdown note set that walks me through integrating the code into an STM32CubeIDE/HAL project, with call-outs on where DMA, interrupts or FreeRTOS might change the picture.

Acceptance
If I can drop your code into a fresh STM32 project, flash it and reliably create, read and append to a test file on three different cards, we’re done.

I’m happy to test on my hardware and report back as we iterate, so you’ll get fast feedback. Looking forward to tightening up this storage path together!