reading SD card on STM32F7

[developer2]

Posted on May 04, 2017 at 15:22

Hi there,

is there anybody with STM32F7XX and is able to read bigger file (larger than 30MBytes) from SD card until the end ? without DMA ?

i'm asking because i tried more types of cards, and i tried to setup clk div for SDIO to 400kHz and i don't have any success :(

i always get error RXOVERR in SDMMC_STA after couple MBytes (2MB-3MB)

i need just confirmation that it's possible ...

thanks for all replies ...

Kind regards

[Tomas DRESLER]

Posted on May 05, 2017 at 22:07

F769, MP3 files w/o issues of sizes around 7 MB with polling. With DMA tested up to 2 GB read/write.

[developer2 · Accepted solution]

Posted on May 05, 2017 at 23:28

Hi everybody,

Edison Thank You,

and Thanks to guys from ST that guided me to use DMA and based on both answers now i realized that i'm using timers with IRQ and if during reading SD occur IRQ that has more actions then FIFO in RX mode in SDIO controller overflows ...