STM32 HAL UART transmission

[kmehranh]

Posted on December 08, 2016 at 09:38

I'm trying to send data by STM32f103 to an Arduino board using UART. Data isn't received properly. The code is generated using STM32CUBEMX and here is the part I added:

uint8_t Test[] = '1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 \n'; //Data to send HAL_UART_Transmit(&huart1,Test,sizeof(Test),1000);// Sending in normal mode HAL_Delay(1000); HAL_UART_Transmit_DMA(&huart1,Test,sizeof(Test));// Sending in DMA mode HAL_Delay(1000);

the received data is:

 {1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1}

in both DMA and normal modes the received data is pretty similar. The UART baud rate is 115

What should I do?

#uart #dma-usart #stm32f1 #stm32cube

[Amel NASRI]

Posted on December 08, 2016 at 11:10

Hi

‌,

The issue seems to be within the amount of data to be sent provided as parameter in the call ofHAL_UART_Transmit_DMA orHAL_UART_Transmit.

In the examples available in the Cube package, a 'COUNTOF' macro is defined to precise the amount of data:

#define COUNTOF(__BUFFER__) (sizeof(__BUFFER__) / sizeof(*(__BUFFER__)))�?

Ex:STM32Cube_FW_F1_V1.4.0\Projects\STM32F103RB-Nucleo\Examples\UART\UART_TwoBoards_ComDMA

-Amel-

[kmehranh]

Posted on December 09, 2016 at 07:15

Hello, thanks for your answer. 

The baud rate between STM32 and Arduino wasn't match!  I used lower baud rate and it's working fine.