stm32 GPIO Configuaration

[meena]

I am using a pin to Switch on the power supply once the MCU is powered.When powering up the MCU I am getting a Glitch before it turns on the MC

GPIO configuaration is given below. For every output I am getting a glich before it SET from RESET   Can anyone help 

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, NFC_Pin|SHN_Pin|RL_A_Pin|LedR_Pin
                          |DPS_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, RL_B_Pin|DA_TX_Pin|LedG_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : NFC_Pin */
  GPIO_InitStruct.Pin = NFC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(NFC_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : RL_B_Pin LedG_Pin */
  GPIO_InitStruct.Pin = RL_B_Pin|LedG_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : PA4 */
  GPIO_InitStruct.Pin = GPIO_PIN_4;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : Mains_Pin */
  GPIO_InitStruct.Pin = Mains_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(Mains_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : SHN_Pin */
  GPIO_InitStruct.Pin = SHN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(SHN_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : RL_A_Pin LedR_Pin */
  GPIO_InitStruct.Pin = RL_A_Pin|LedR_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : DA_TX_Pin */
  GPIO_InitStruct.Pin = DA_TX_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(DA_TX_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LIVE_SENSE_Pin */
  GPIO_InitStruct.Pin = LIVE_SENSE_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(LIVE_SENSE_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : DPS_Pin */
  GPIO_InitStruct.Pin = DPS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(DPS_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : DA_RX_Pin */
  GPIO_InitStruct.Pin = DA_RX_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
  HAL_GPIO_Init(DA_RX_GPIO_Port, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);

[SofLit]

Hello,

I am using a pin to Switch on the power supply once the MCU is powered.When powering up the MCU I am getting a Glitch before it turns on the MC

 This statement is not clear: "Switch on the power supply" of what? and what "MC" stands for?

Also what is the pin that "switches the power supply" in your code? and what is the exact GPIO pin used for that purpose as in your code you've used definitions.

[Andrew Neil]

---

@meena wrote:

I am using a pin to Switch on the power supply once the MCU is powered.

---

Show the schematic of how you're doing that.

Remember that you have no control of the state of the GPIO pin in the time between the MCU starting, and your code reaching the point at which it configures the pin ...

[Tesla DeLorean]

If you want to control the state of a pin out of reset, the normal method is to use an external pull-up/down resistor

And for things that are safety critical, probably two pins at different states to provide some level of interlock.