stm32h7 D1/D0 GPIO

[wjian.2]

If i configure D1 pj8 as tx for uart8，D0 pj9 as rx for uart8.When conect to led direct D0 could let led on but D1 no this case should be right ？

static void MX_GPIO_Init(void)

{

 GPIO_InitTypeDef GPIO_InitStruct;

 /* GPIO Ports Clock Enable */

 __HAL_RCC_GPIOJ_CLK_ENABLE();

 __HAL_RCC_UART8_CLK_ENABLE();

 /*Configure GPIO pin: PJ8   For D1 pin for TX */

 GPIO_InitStruct.Pin = GPIO_PIN_8;

 //GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

 GPIO_InitStruct.Pull = GPIO_PULLUP; //pullup

 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

 GPIO_InitStruct.Alternate = GPIO_AF8_UART8;

  HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);

 /*Configure GPIO pin: PJ9   For D0 pin for RX */

 GPIO_InitStruct.Pin = GPIO_PIN_9;

 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; //MODE_ALTERNATE?

 GPIO_InitStruct.Pull = GPIO_PULLUP;

 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

 GPIO_InitStruct.Alternate = GPIO_AF8_UART8;

HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);

}

[FBL]

Hello @wjian.2 :

Could you please provide more details, which STM32 product you are using?

[wjian.2]

stm32h747i-disco  @F.Belaid

[Tesla DeLorean]

Repeatedly reposting basically the same topic to multiple threads is not helpful, pick one and stick with it.

https://community.st.com/t5/stm32-mcu-products/stm32h747i-disco-gpio-gpio-mode-af-pp-function/td-p/584573

https://community.st.com/t5/stm32-mcu-products/uart8-get-only-get-noise-in-stm32h747i-disco/td-p/584007

[Karl Yamashita]

@wjian.2

I have a Nucleo-H723ZG where I was using a CAN transceiver on the Zio connector. After failure to get the CAN bus communcation working. I started to troubleshoot and I found that the schematic did not label the CAN RX/TX correctly. It was off by one pin. 

If it's possible, you might want to ohm out the D1 which I assume is on the Arduino connector to the uC pin to see if there is a direct connection? 

[Tesla DeLorean · Accepted solution]

Solved  https://community.st.com/t5/stm32-mcu-products/uart8-get-only-get-noise-in-stm32h747i-disco/td-p/584007