circuitpython/stm/lib/usb_bsp.c

/**
  ******************************************************************************
  * @file    usb_bsp.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    19-March-2012
  * @brief   This file is responsible to offer board support package and is 
  *          configurable by user.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm_misc.h"
#include "usb_bsp.h"

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
* @{
*/

/** @defgroup USB_BSP
* @brief This file is responsible to offer board support package
* @{
*/ 

/** @defgroup USB_BSP_Private_Defines
* @{
*/ 
/**
* @}
*/ 


/** @defgroup USB_BSP_Private_TypesDefinitions
* @{
*/ 
/**
* @}
*/ 





/** @defgroup USB_BSP_Private_Macros
* @{
*/ 
/**
* @}
*/ 

/** @defgroup USBH_BSP_Private_Variables
* @{
*/ 

/**
* @}
*/ 

/** @defgroup USBH_BSP_Private_FunctionPrototypes
* @{
*/ 
/**
* @}
*/ 

/** @defgroup USB_BSP_Private_Functions
* @{
*/ 


/**
* @brief  USB_OTG_BSP_Init
*         Initilizes BSP configurations
* @param  None
* @retval None
*/

void USB_OTG_BSP_Init(USB_OTG_CORE_HANDLE *pdev) {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    /* Configure DM DP Pins */
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_OTG_FS);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_OTG_FS);

    /* Configure VBUS Pin (or disable VBUS_SENSING_ENABLED) */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
    RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_OTG_FS, ENABLE);
}

/**
* @brief  USB_OTG_BSP_EnableInterrupt
*         Enable USB Global interrupt
* @param  None
* @retval None
*/
void USB_OTG_BSP_EnableInterrupt(USB_OTG_CORE_HANDLE *pdev) {
    // this assumes we use NVIC_PriorityGroup_4
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = OTG_FS_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 8;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/**
* @brief  USB_OTG_BSP_uDelay
*         This function provides delay time in micro sec
* @param  usec : Value of delay required in micro sec
* @retval None
*/
void USB_OTG_BSP_uDelay (const uint32_t usec)
{
  uint32_t count = 0;
  const uint32_t utime = (160 * usec / 5);
  do
  {
    if ( ++count > utime )
    {
      return ;
    }
  }
  while (1);
}


/**
* @brief  USB_OTG_BSP_mDelay
*          This function provides delay time in milli sec
* @param  msec : Value of delay required in milli sec
* @retval None
*/
void USB_OTG_BSP_mDelay (const uint32_t msec)
{
  USB_OTG_BSP_uDelay(msec * 1000);   
}
/**
* @}
*/ 

/**
* @}
*/ 

/**
* @}
*/

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/