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developer2
developer2
Senior
May 4, 2017 1:22 PM UTC
Solved

reading SD card on STM32F7

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

    This topic has been closed for replies.
    developer2
    developer2Best answer
    Senior
    May 5, 2017 9:28 PM UTC
    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 ...

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    2 replies

    Tomas DRESLER
    Tomas DRESLER
    Associate II
    May 5, 2017 8:07 PM UTC
    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
    developer2AuthorBest answer
    Senior
    May 5, 2017 9:28 PM UTC
    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 ...

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