DMA keep sending data

[sde c.1]

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

[Tesla DeLorean]

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?

[TDK · Accepted solution]

Perhaps the DMA is somehow in circular mode.

[sde c.1]

that was the case ! thank you