32F769IDISCOVERY UART7 usage

[Joerg Wagner]

Posted on November 08, 2017 at 13:41

I selected the 32F769IDISCOVERY board in CubeMX.

Why is UART7 in CubeMX disabled?

The pins in the conflicts list are not mapped or active.

For my app I need the Arduino Pin D3 which is UART7_RX.

I studied the schematics and do not find any conflict with other devices.

When I force to use PF6 for RX7 and PF7 for TX7 the UART7

can be activated in CubeMX.

But my app does not receive a character in the callback function (IT is used).

Thank you.

[Tesla DeLorean]

Posted on November 08, 2017 at 14:40

I would expect this to be workable PF6 AF8 UART7 (D3)

Check the clocks and pin initialization

Might try later, have one of these boards on the bench currently.

[Joerg Wagner]

Posted on November 08, 2017 at 16:21

Hello Clive!

For the CubeMX issue you do not need a board.

I forgot to mention some things:

- USART1, UART5 and USART6 are in use as well (I need them all)

- STemWin with BSP (just SDRAM, no SD right now)

- LwIP (NO_SYS=1)

  /* USER CODE END UART7_MspInit 0 */

    __HAL_RCC_UART7_CLK_ENABLE();

    /**UART7 GPIO Configuration

    PF6     ------> UART7_RX    PF7     ------> UART7_TX    */    GPIO_InitStruct.Pin = UART7_RX_Pin; // |UART7_TX_Pin;    not needed    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;    GPIO_InitStruct.Pull = GPIO_PULLUP;    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;    GPIO_InitStruct.Alternate = GPIO_AF8_UART7;    HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

    /* UART7 interrupt Init */

    HAL_NVIC_SetPriority(UART7_IRQn, 0, 0);    HAL_NVIC_EnableIRQ(UART7_IRQn);

  /* USER CODE BEGIN UART7_MspInit 1 */

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)

{    if (huart==&huart7) {

      ...

      HAL_UART_Receive_IT(&huart7, &rx7_ch, 1);

   }

   ...

}

in main()

MX_UART7_Init();

   ...

   HAL_UART_Receive_IT(&huart7, &rx7_ch, 1);

It worked sometimes, but not everytime. It means

if (huart==&huart7)

is never true.

I have the problem (no UART7 interrupts or a simple HAL_UART_Receive(&huart7, &rx7_ch, 1, 0x100); ) after calling

GUI_Init();

and I don't know what it does exactly. And yes, I tried to call MX_UART7_Init(); after GUI_Init();

But it worked for a time, there is hope...

- Joerg -

[Joerg Wagner · Accepted solution]

Posted on November 08, 2017 at 22:37

I think I solved it and this is a kind of embarrassing: The device, a barcode scanner, was not connected 100% with his RJ45 connector. Sometimes data were received and sometimes not.

@

Turvey.Clive.002

: Thank you for your time.

But the issue with CubeMX still exists, not a big problem - just a little spot.

[Tesla DeLorean]

Posted on November 08, 2017 at 22:00

>>

For the CubeMX issue you do not need a board.

Except I'm not using CubeMX, and have no control of its development/function - Don't work for ST.

I've confirmed that UART7 will receive data from Arduino D3 (PF6 UART7_RX) on the STM32F769I-DISCO, so hardware is viable/functional.

For the experiment I use USART1 PA9/PA10 to output data via the VCP, and proved a GPS shield either on D0 (PC7 USART6_RX) or 

D3 (PF6 UART7_RX) was usable.