DMA keep sending data

sde c.1 · ‎2021-09-13

Hi all,

I want to send 3 bytes with the UART DMA controller

but when this line is executed, the uart sends these 3 bytes endlessly .

Why does the transmitting not stop after 3 bytes ?

HAL_UART_Transmit_DMA(&huart1,(uint8_t *)spi_buf_in,3);

Thank you

Steve

TDK · ‎2021-09-13

Perhaps the DMA is somehow in circular mode.

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Tesla DeLorean · ‎2021-09-13

Don't know. Is this the only line in the program, or do you configure the DMA and associativity somewhere, or have related call-backs?

Any particular STM32?

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TDK · ‎2021-09-13

Perhaps the DMA is somehow in circular mode.

If you feel a post has answered your question, please click "Accept as Solution".

sde c.1 · ‎2021-09-13

that was the case ! thank you