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Q&A STM32. What should be done in firmware for VBUS detection through a GPIO pin?

I've found a solution, and tested it. What @Olin wrote earlier holds. This is to post my code for STM32. Does the VBUS detection have to be done in an interrupt? I've asked the ST's technic...

posted 4mo ago by Nick Alexeev‭ · edited 4mo ago by Nick Alexeev‭

Answer

#3: Post edited by

Nick Alexeev‭ · 2024-07-14T14:54:01Z (4 months ago)

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~~What [@Olin wrote earlier](https://electrical.codidact.com/posts/291709/291716#answer-291716) holds. This is to post code for STM32.~~
> Does the VBUS detection have to be done in an interrupt?
~~I posted this question to ST's technical support, and they said that it should be done in an interrupt. Here's my ISR code.~~
/**
* @brief EXTI line detection callback
* @param GPIO_Pin: Specifies the pins connected EXTI line
*/
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == VBUS_DETECT_Pin)
{
if (HAL_GPIO_ReadPin(VBUS_DETECT_GPIO_Port, VBUS_DETECT_Pin) == GPIO_PIN_SET)
{
MX_USB_Device_Init(); // reinitialize USB
}
else
{
USB_Device_DeInit(); // deinitialize USB
}
}
}
The `USB_Device_DeInit()` function is in the `usb_device.c`.
/* USER CODE BEGIN 1 */
void USB_Device_DeInit(void)
{
if (USBD_Stop(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
if (USBD_DeInit(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
}
/* USER CODE END 1 */
`MX_USB_Device_Init()` remained unchanged just like CubeMX generated it.
I ran these snippets by the ST's support, and got a "looks good to me" verdict.

I've found a solution, and tested it. What [@Olin wrote earlier](https://electrical.codidact.com/posts/291709/291716#answer-291716) holds. This is to post my code for STM32.
> Does the VBUS detection have to be done in an interrupt?
I've asked the ST's technical support, and they replied that it should be done in the interrupt. Here's my ISR code.
/**
* @brief EXTI line detection callback
* @param GPIO_Pin: Specifies the pins connected EXTI line
*/
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == VBUS_DETECT_Pin)
{
if (HAL_GPIO_ReadPin(VBUS_DETECT_GPIO_Port, VBUS_DETECT_Pin) == GPIO_PIN_SET)
{
MX_USB_Device_Init(); // reinitialize USB
}
else
{
USB_Device_DeInit(); // deinitialize USB
}
}
}
The `USB_Device_DeInit()` function is in the `usb_device.c`.
/* USER CODE BEGIN 1 */
void USB_Device_DeInit(void)
{
if (USBD_Stop(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
if (USBD_DeInit(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
}
/* USER CODE END 1 */
`MX_USB_Device_Init()` remained unchanged just like CubeMX generated it.
I ran these snippets by the ST's support, and got a "looks good to me" verdict.

#2: Post edited by

Nick Alexeev‭ · 2024-07-14T14:28:51Z (4 months ago)

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What [@Olin wrote earlier](https://electrical.codidact.com/posts/291709/291716#answer-291716) holds. This is to post code for STM32.
> Does the VBUS detection have to be done in an interrupt?
I posted this question to ST's technical support, and they said that it should be done in an interrupt. Here's my ISR code.
/**
* @brief EXTI line detection callback
* @param GPIO_Pin: Specifies the pins connected EXTI line
*/
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == VBUS_DETECT_Pin)
{
if (HAL_GPIO_ReadPin(VBUS_DETECT_GPIO_Port, VBUS_DETECT_Pin) == GPIO_PIN_SET)
{
MX_USB_Device_Init(); // reinitialize USB
}
else
{
USB_Device_DeInit(); // deinitialize USB
}
}
}
~~The USB_Device_DeInit() function is in the `usb_device.c`.~~
/* USER CODE BEGIN 1 */
void USB_Device_DeInit(void)
{
if (USBD_Stop(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
if (USBD_DeInit(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
}
/* USER CODE END 1 */
`MX_USB_Device_Init()` remained unchanged just like CubeMX generated it.
I ran these snippets by the ST's support, and got a "looks good to me" verdict.

What [@Olin wrote earlier](https://electrical.codidact.com/posts/291709/291716#answer-291716) holds. This is to post code for STM32.
> Does the VBUS detection have to be done in an interrupt?
I posted this question to ST's technical support, and they said that it should be done in an interrupt. Here's my ISR code.
/**
* @brief EXTI line detection callback
* @param GPIO_Pin: Specifies the pins connected EXTI line
*/
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == VBUS_DETECT_Pin)
{
if (HAL_GPIO_ReadPin(VBUS_DETECT_GPIO_Port, VBUS_DETECT_Pin) == GPIO_PIN_SET)
{
MX_USB_Device_Init(); // reinitialize USB
}
else
{
USB_Device_DeInit(); // deinitialize USB
}
}
}
The `USB_Device_DeInit()` function is in the `usb_device.c`.
/* USER CODE BEGIN 1 */
void USB_Device_DeInit(void)
{
if (USBD_Stop(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
if (USBD_DeInit(&hUsbDeviceFS) != USBD_OK)
{
Error_Handler();
}
}
/* USER CODE END 1 */
`MX_USB_Device_Init()` remained unchanged just like CubeMX generated it.
I ran these snippets by the ST's support, and got a "looks good to me" verdict.

#1: Initial revision by

Nick Alexeev‭ · 2024-07-14T14:27:44Z (4 months ago)

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What [@Olin wrote earlier](https://electrical.codidact.com/posts/291709/291716#answer-291716) holds.  This is to post code for STM32.

> Does the VBUS detection have to be done in an interrupt?

I posted this question to ST's technical support, and they said that it should be done in an interrupt.  Here's my ISR code.

    /**
      * @brief EXTI line detection callback
      * @param GPIO_Pin: Specifies the pins connected EXTI line
      */
    void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
    {
      if (GPIO_Pin == VBUS_DETECT_Pin)
      {
        if (HAL_GPIO_ReadPin(VBUS_DETECT_GPIO_Port, VBUS_DETECT_Pin) == GPIO_PIN_SET)
        {
          MX_USB_Device_Init(); // reinitialize USB
        }
        else
        {
          USB_Device_DeInit(); // deinitialize USB
        }
      }
    }

The USB_Device_DeInit() function is in the `usb_device.c`.

    /* USER CODE BEGIN 1 */
     
    void USB_Device_DeInit(void)
    {
      if (USBD_Stop(&hUsbDeviceFS) != USBD_OK) 
      {
        Error_Handler();
      }
      if (USBD_DeInit(&hUsbDeviceFS) != USBD_OK) 
      {
        Error_Handler();
      }
    }
    /* USER CODE END 1 */

`MX_USB_Device_Init()` remained unchanged just like CubeMX generated it.

I ran these snippets by the ST's support, and got a "looks good to me" verdict.

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