stm32h747i-disco gpio GPIO_MODE_AF_PP function

[wjian.2]

If i configure D1 pj8 as tx for uart8，D0 pj9 as rx for uart8.When i conect to led directly D0（rx） could let led on but D1（txno in this case should be right ？Both pin with GPIO_MODE_AF_PP//PULLUP

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);

}

[TDK]

You've created at least 3 topics on this issue over the past few days. Perhaps follow through with those instead of reposting?

[wjian.2]

if i reply some question noone answer my reply，and i wait a few hours no one reply，but those Evangelists never answer a other day， for this reason  i  created ，if it not right I‘m sorry.

[Tesla DeLorean]

Its a forum, you're not paying for real-time support, people are situated all over the world, and have jobs. Opening new threads doesn't change the dynamics.

There seems like there's a very fundamental issue here, like the codes not running, or the boards damaged, or you're not looking at the right pins. Going to need to do some hands on debugging and sanity checking. Do you have a second board, or a colleague who can work with you directly?