STM32F415RGT6 is used on custom board. Everything looks fine except that SDIO opertions.
f_write function is called at an interval about 500ms to write 512Bytes to SD card. SDIO_CLK is 24MHz, 4bit bus wide. I really don't know why there are activities lasting 3ms on sdio_cmd pin.
Haven't timed it, but single sector writing is very inefficient, there is a lot of command overhead, blocks on the media are typically around 128KB. If your writes aren't aligned FatFs will need to read and write several sectors.
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Haven't timed it, but single sector writing is very inefficient, there is a lot of command overhead, blocks on the media are typically around 128KB. If your writes aren't aligned FatFs will need to read and write several sectors.
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