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TKim.11
Associate
June 17, 2019
Question

STM32F413VGT uart9 baud rate problem

  • June 17, 2019
  • 0 replies
  • 532 views

There is a bug to set baud-rate of uart9.

If I set it to 9600, it works as 19200.

I think it is a problem of driver code.

The UART9 and UART10 should use PCLK2 but the code uses PLCK1.

Please check below.

My environment:

Win 10. 1809

STM32CubxMX version 5.2.1

Atollic TrueSTUDIO® for STM32, Built on Eclipse Neon.1a.

Version: 9.3.0 

Build id: 20190212-0734

stm32f4xx_hal_uart.c : line 3094

#if defined(USART6)
 if ((huart->Instance == USART1) || (huart->Instance == USART6))
 {
 huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
 }
#else
 if (huart->Instance == USART1)
 {
 huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK2Freq(), huart->Init.BaudRate);
 }
#endif /* USART6 */
 else
 {
 huart->Instance->BRR = UART_BRR_SAMPLING16(HAL_RCC_GetPCLK1Freq(), huart->Init.BaudRate);
 }
 }

datasheet : stm32f413vg.pdf page 37

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