Apparent error on the HAL SPI library when using DMA.

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Even after setting up a DMA stream to a SPI_RX DMA request, the HAL_SPI_Receive_DMA() function return error code 1 when called. I've solved this problem by also setting up a DMA stream to the SPI_TX request, even though I won't use it.

Problem occurred when using SPI1 on Full-Duplex Master mode in the STM32F412 uC, STM32CubeIDE Version: 1.16.1

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Imen.DBest answer

ST Technical Moderator

Hello @EngScn ,

In Full-Duplex mode, both the TX and RX DMA streams need to be configured.

Ensure that the SPI is disabled before calling the HAL_SPI_Receive_DMA () function to avoid overrun errors.

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Andrew Neil

Super User

@EngScn wrote:
Problem occurred when using SPI1 on Full-Duplex Master mode

Surely, in a Full-Duplex master, you would have to have a TX running - so the behaviour is as expected?

@EngScn wrote:
function return error code 1

What does that code indicate?

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.

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EngScnAuthor

Associate

Surely, in a Full-Duplex master, you would have to have a TX running - so the behaviour is as expected?

I would like to have only my RX using DMA. My TX would be transmitting data in polling mode. I believe this should justify using a DMA stream only to the RX channel?

What does that code indicate?

HAL_SPI_Receive_DMA() returns a HAL_StatusTypeDef, for code 1 that would be HAL_ERROR.

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