SDMMC and USB Mass Storage Class (MSC).

[indhuja]

I am using the STM32H745I-DISCO board, where Core M4 handles SDMMC and FATFS, and Core M7 manages USB Mass Storage Class (MSC). Is there a procedure or any available documentation on linking both cores for seamless data sharing?

[Pavel A.]

Sharing which data? Do you mean, sharing the filesystem on SD card between the CM4 and CM4 applications? (like, both CM4 and CM7 can create files on the SDcard?)

[indhuja]

No. File system should create in m4 , Only file access needs to be implemented in USB.

1. Write all sensor data in flash through m4.

2. Collect stored data through M7 via USB mass storage

[Pavel A.]

Very good, so the CM4 and CM7 just need to send data between them. Use any internal RAM that can be shared between them, and hardware semaphores for synchronization.