STM32F779 USB Mass Storage and SD Card

Hau Lam · ‎2018-04-24

Posted on April 24, 2018 at 11:45

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Tesla DeLorean · ‎2018-04-24

Posted on April 24, 2018 at 17:58

>>It return error 'HAL_SD_ERROR_TX_UNDERRUN' in function

HAL_SD_WriteBlocks but I don't know why.

You have too much contention for processor focus, you will want to be using SDMMC w/DMA so it can service the peripheral quick enough. You might be able to dial back the speed, but that might still be marginal.

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Hau Lam · ‎2018-04-27

Posted on April 27, 2018 at 09:34

Hi

Turvey.Clive.002

‌ , When 1 tried to use USB Mass Storage + SD Card + DMA , But i stuck at the step, Window can not detect USB Mass Storage.

as the link below

https://community.st.com/0D50X00009Xki9aSAB

Could you help me review this issue .

Many thanks for your feed back.