STM32F407 USART receive, When change baud rate not working

[Tato]

Hello.

I'm using STM32F407, use usart3 set DMA setting baud rate 9600 and use receive 

void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)

{

if (huart->Instance == USART3) {

HAL_UARTEx_ReceiveToIdle_DMA(&huart3, RxBuff, Size);

__HAL_DMA_DISABLE_IT(&hdma_usart3_rx, DMA_IT_HT);

}

}

connect to computer using software terminal "HTerm"

Set baud rate 9600 STM32F407 can receive

But i change to other baud rate such as 115200

then i change baud rate 9600 can not receive

[Tesla DeLorean]

Check if you have any sticky errors in the status register that need clearing.

ie noise, framing, parity, overrun, etc

[Tato]

I'm Setting USART3 below

static void MX_USART3_UART_Init(void)

{

huart3.Instance = USART3;

huart3.Init.BaudRate = 9600;

huart3.Init.WordLength = UART_WORDLENGTH_8B;

huart3.Init.StopBits = UART_STOPBITS_1;

huart3.Init.Parity = UART_PARITY_NONE;

huart3.Init.Mode = UART_MODE_TX_RX;

huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;

huart3.Init.OverSampling = UART_OVERSAMPLING_16;

if (HAL_UART_Init(&huart3) != HAL_OK)

{

Error_Handler();

}

}

I ever clearing below

"__HAL_UART_CLEAR_PEFLAG(&huart3);"

"__HAL_UART_CLEAR_FEFLAG(&huart3);"

"__HAL_UART_CLEAR_NEFLAG(&huart3);"

"__HAL_UART_CLEAR_OREFLAG(&huart3);"

"__HAL_DMA_DISABLE_IT(&hdma_usart3_rx, DMA_IT_HT);"

"__HAL_UART_CLEAR_FLAG(&huart3, UART_IT_IDLE);"

"__HAL_UART_ENABLE_IT(&huart3, UART_IT_RXNE);"

[waclawek.jan]

> then i change baud rate 9600 can not receive

How do you change baud rate?

Read out content of UART registers for "working" and "not working" cases, and compare/post.

JW

[Tato · Accepted solution]

1. Setting baud rate 9600 HTerm is working

2. Setting baud rate 56000 HTerm is working

3. Setting came back  baud rate 9600 HTerm is not working

[Tato]

1. Setting baud rate 9600 HTerm is working

2. Setting baud rate 56000 HTerm is working

3. Setting came back  baud rate 9600 HTerm is not working

Thank you.

[Tato]

1. Setting baud rate 9600 HTerm is working

2. Setting baud rate 56000 HTerm is working

3. Setting came back  baud rate 9600 HTerm is not working

Thank you

[Tato]

Anyone help me ?

[Andrew Neil]

You've marked your post of ‎2024-01-14 05:16 PM as the Solution - did you not mean to do that?