lora-irrigation/si_usb.c

/*
 * Code for reseting USB via the SYSINIT mechanism.
 *
 * Note: This works for both Node151 and BluePill (F1) as PA12 is
 * USB_DP on both.
 */

#include <sysinit.h>

#include <usbd_cdc_if.h>
#include <usb_device.h>

static void
usb_reset(void)
{
	/*
	 * pretend that the device was newly plugged in
	 * see: https://stackoverflow.com/a/67336535
	 */

	GPIO_InitTypeDef GPIO_InitStructure;

	GPIO_InitStructure = (GPIO_InitTypeDef){
		.Pin = GPIO_PIN_11|GPIO_PIN_12,
		.Mode = GPIO_MODE_OUTPUT_PP,
		.Pull = GPIO_PULLDOWN,
		.Speed = GPIO_SPEED_HIGH,
	};

	__HAL_RCC_GPIOA_CLK_ENABLE();
	HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
	//HAL_GPIO_WritePin(GPIOA, GPIO_PIN_11, GPIO_PIN_RESET);
	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);

	HAL_Delay(10);
}
SYSINIT_VF(usb_reset, SI_SUB_USB, SI_ORDER_FIRST, usb_reset);