STM32L452 DMA + SDIO Overrun Issue

Forum|Forum|7 years ago
September 12, 2019
7 replies
1993 views

Hi Guys,

I'm currently using an STM32L452 device and i'm having some problems with the SDIO when using it with DMA.

I have configured DMA and SDIO usign the file generated from STM32Cube tool.

When I try to read the SD card without using DMA , everything works fine.

With the DMA I keep having the RX_OVERRUN error that basically aborts all the DMA interrupts events and then the function remain stucked .

I have searched everywhere for a solution and tryed to apply all of them but i still have the same issue.

Do you know if this is a well known problem and if there is a solution ?

This topic has been closed for replies.

Tesla DeLorean

Guru

I think it is generally accepted that the CubeMX SDIO/SDMMC code output has issues, the forum is full of complaints.

Is this a NUCLEO board, or something custom? For custom report pins used for UART output, HSE clock frequency, etc.

Pretty sure I've had DMA working across all L4/L4+ parts.

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Jfava

Visitor II

Hi Clive,

After few attempts I figured out that the DMA works if I enable just one of them ...for example I tried enabling it for RX without configuring the DMA channel for TX...and i can receive the data correctly.

If i try to enable both of them (TX and RX) i have the Overrun issue...

i would like to manage both operations with DMA sincerly..

Tesla DeLorean

Guru

It only ever does one direction at a time. Check how the HAL callbacks are being dispatched. Review HAL example codes for the DISCO/EVAL boards, these tend to have been tested better.

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