text: /*
   * This file is part of the Micro Python project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2018 hathach for Adafruit Industries
   * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  
  #include "tick.h"
  #include "supervisor/usb.h"
  #include "lib/utils/interrupt_char.h"
  #include "lib/mp-readline/readline.h"
  #include "stm32f4xx_hal.h"
  
  #include "py/mpconfig.h"
  
  #include "common-hal/microcontroller/Pin.h"
  
  STATIC void init_usb_vbus_sense(void) {
  
  #if (BOARD_NO_VBUS_SENSE)
      // Disable VBUS sensing
      #ifdef USB_OTG_GCCFG_VBDEN
          USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
      #else
          USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
          USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
          USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
      #endif
  #else
      // Enable VBUS hardware sensing
      #ifdef USB_OTG_GCCFG_VBDEN
          USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
      #else
          USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
          USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN; // B Device sense
      #endif
  #endif
  }
  
  void init_usb_hardware(void) {
      //TODO: if future chips overload this with options, move to peripherals management. 
  
      GPIO_InitTypeDef GPIO_InitStruct = {0};
      /**USB_OTG_FS GPIO Configuration
      PA10     ------> USB_OTG_FS_ID
      PA11     ------> USB_OTG_FS_DM
      PA12     ------> USB_OTG_FS_DP 
      */
      __HAL_RCC_GPIOA_CLK_ENABLE();
  
        /* Configure DM DP Pins */
      GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
      GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
      GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
      GPIO_InitStruct.Pull = GPIO_NOPULL;
      GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
      never_reset_pin_number(0, 11);
      never_reset_pin_number(0, 12);
  
      /* Configure VBUS Pin */
      GPIO_InitStruct.Pin = GPIO_PIN_9;
      GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
      GPIO_InitStruct.Pull = GPIO_NOPULL;
      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
      never_reset_pin_number(0, 9);
  
      /* This for ID line debug */
      GPIO_InitStruct.Pin = GPIO_PIN_10;
      GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
      GPIO_InitStruct.Pull = GPIO_PULLUP;
      GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
      GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
      never_reset_pin_number(0, 10);
  
  #ifdef STM32F412Zx
      /* Configure POWER_SWITCH IO pin (F412 ONLY)*/
      GPIO_InitStruct.Pin = GPIO_PIN_8;
      GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
      GPIO_InitStruct.Pull = GPIO_NOPULL;
      HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
      never_reset_pin_number(0, 8);
  #endif
      
      /* Peripheral clock enable */
      __HAL_RCC_USB_OTG_FS_CLK_DISABLE();
      __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
  
      init_usb_vbus_sense();
  }
  