Uart Transmits only 2 bytes of data not more with MCSDK

[STuser2]

I want to enable the UART communication in MCSDK software which is very time critical task, i enabled UART with DMA, the problem is it cannot transmit more than 2 bytes even if i give 3 or more for transmission

HAL_UART_Transmit_DMA(&huart3, buffer, 3);

I get the call back 

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
	uartransmissioncomplete = true;
}

after every 2 bytes. 

I tested the same program only with UART it works fine transferring more bytes. So, can i just go ahead with transmitting 2 bytes for every call back function, or will i really be able to transfer more bytes in the complete project, since i don't want to disturb the main functionality, i want UART data for data logging. 

[Saket_Om]

Hello @STuser2 

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@STuser2 wrote: 

I tested the same program only with UART it works fine transferring more bytes.

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You mean UART without DMA?

Please refer to the example below: 

Projects/NUCLEO-G474RE/Examples/UART/UART_TwoBoards_ComDMA

[STuser2]

You mean UART without DMA?

It is UART with DMA. I have programmed only UART and DMA to see if it works without the integration with motor control. 

When i integrate with the main program of motor control, there are so many other high priority interrupts running i am not sure how do i code the UART so that it does not get blocked, only question is why do i get a callback without transmitting all the bytes.   

[Saket_Om]

Hello @STuser2 

Could you please share your code so that we can assist you more effectively?