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/**
  ******************************************************************************
  * @file    USB_Device/HID_Standalone/Src/usbd_desc.c
  * @author  MCD Application Team
  * @version V1.0.1
  * @date    21-September-2015
  * @brief   This file provides the USBD descriptors and string formatting method.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "usbd_core.h"
#include "usbd_desc.h"
#include "usbd_conf.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USBD_VID                      0x0483
#define USBD_PID                      0x5710
#define USBD_LANGID_STRING            0x409
#define USBD_MANUFACTURER_STRING      "STMicroelectronics"
#define USBD_PRODUCT_HS_STRING        "HID Joystick in HS Mode"
#define USBD_PRODUCT_FS_STRING        "HID Joystick in FS Mode"
#define USBD_CONFIGURATION_HS_STRING  "HID Config"
#define USBD_INTERFACE_HS_STRING      "HID Interface"
#define USBD_CONFIGURATION_FS_STRING  "HID Config"
#define USBD_INTERFACE_FS_STRING      "HID Interface"

/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ManufacturerStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ProductStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
#ifdef USB_SUPPORT_USER_STRING_DESC
uint8_t *USBD_HID_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);  
#endif /* USB_SUPPORT_USER_STRING_DESC */  

/* Private variables ---------------------------------------------------------*/
USBD_DescriptorsTypeDef HID_Desc = {
  USBD_HID_DeviceDescriptor,
  USBD_HID_LangIDStrDescriptor, 
  USBD_HID_ManufacturerStrDescriptor,
  USBD_HID_ProductStrDescriptor,
  USBD_HID_SerialStrDescriptor,
  USBD_HID_ConfigStrDescriptor,
  USBD_HID_InterfaceStrDescriptor,
};

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN   uint8_t USBD_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
  0x12,                       /* bLength */
  USB_DESC_TYPE_DEVICE,       /* bDescriptorType */
  0x00,                       /* bcdUSB */
  0x02,
  0x00,                       /* bDeviceClass */
  0x00,                       /* bDeviceSubClass */
  0x00,                       /* bDeviceProtocol */
  USB_MAX_EP0_SIZE,           /* bMaxPacketSize */
  LOBYTE(USBD_VID),           /* idVendor */
  HIBYTE(USBD_VID),           /* idVendor */
  LOBYTE(USBD_PID),           /* idVendor */
  HIBYTE(USBD_PID),           /* idVendor */
  0x00,                       /* bcdDevice rel. 2.00 */
  0x02,
  USBD_IDX_MFC_STR,           /* Index of manufacturer string */
  USBD_IDX_PRODUCT_STR,       /* Index of product string */
  USBD_IDX_SERIAL_STR,        /* Index of serial number string */
  USBD_MAX_NUM_CONFIGURATION  /* bNumConfigurations */
}; /* USB_DeviceDescriptor */

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN   uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = {
  USB_LEN_LANGID_STR_DESC,         
  USB_DESC_TYPE_STRING,       
  LOBYTE(USBD_LANGID_STRING),
  HIBYTE(USBD_LANGID_STRING), 
};

uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] =
{
  USB_SIZ_STRING_SERIAL,      
  USB_DESC_TYPE_STRING,    
};

#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;

/* Private functions ---------------------------------------------------------*/
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);
static void Get_SerialNum(void);

/**
  * @brief  Returns the device descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_DeviceDesc);
  return (uint8_t*)USBD_DeviceDesc;
}

/**
  * @brief  Returns the LangID string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_LangIDDesc);  
  return (uint8_t*)USBD_LangIDDesc;
}

/**
  * @brief  Returns the product string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {   
    USBD_GetString((uint8_t *)USBD_PRODUCT_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_PRODUCT_FS_STRING, USBD_StrDesc, length);    
  }
  return USBD_StrDesc;
}

/**
  * @brief  Returns the manufacturer string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  USBD_GetString((uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
  return USBD_StrDesc;
}

/**
  * @brief  Returns the serial number string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = USB_SIZ_STRING_SERIAL;
  
  /* Update the serial number string descriptor with the data from the unique ID*/
  Get_SerialNum();
  
  return (uint8_t*)USBD_StringSerial;
}

/**
  * @brief  Returns the configuration string descriptor.    
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)USBD_CONFIGURATION_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_CONFIGURATION_FS_STRING, USBD_StrDesc, length); 
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Returns the interface string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)USBD_INTERFACE_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)USBD_INTERFACE_FS_STRING, USBD_StrDesc, length);
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Create the serial number string descriptor 
  * @param  None 
  * @retval None
  */
static void Get_SerialNum(void)
{
  uint32_t deviceserial0, deviceserial1, deviceserial2;
  
  deviceserial0 = *(uint32_t*)DEVICE_ID1;
  deviceserial1 = *(uint32_t*)DEVICE_ID2;
  deviceserial2 = *(uint32_t*)DEVICE_ID3;
  
  deviceserial0 += deviceserial2;
  
  if (deviceserial0 != 0)
  {
    IntToUnicode (deviceserial0, &USBD_StringSerial[2] ,8);
    IntToUnicode (deviceserial1, &USBD_StringSerial[18] ,4);
  }
}

/**
  * @brief  Convert Hex 32Bits value into char 
  * @param  value: value to convert
  * @param  pbuf: pointer to the buffer 
  * @param  len: buffer length
  * @retval None
  */
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)
{
  uint8_t idx = 0;
  
  for( idx = 0 ; idx < len ; idx ++)
  {
    if( ((value >> 28)) < 0xA )
    {
      pbuf[ 2* idx] = (value >> 28) + '0';
    }
    else
    {
      pbuf[2* idx] = (value >> 28) + 'A' - 10; 
    }
    
    value = value << 4;
    
    pbuf[ 2* idx + 1] = 0;
  }
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/usbd_customhid_if.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   USB Device Custom HID interface file.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "usbd_customhid_if.h"
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static int8_t CustomHID_Init(void);
static int8_t CustomHID_DeInit(void);
static int8_t CustomHID_OutEvent(uint8_t event_idx, uint8_t state);

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef  AdcHandle;
uint32_t ADCConvertedValue = 0;
uint32_t ADC_Prev_ConvertedValue = 0;
uint8_t SendBuffer[2];
extern USBD_HandleTypeDef USBD_Device;

__ALIGN_BEGIN static uint8_t CustomHID_ReportDesc[USBD_CUSTOM_HID_REPORT_DESC_SIZE] __ALIGN_END =
{
  0x06, 0xFF, 0x00,      /* USAGE_PAGE (Vendor Page: 0xFF00) */                       
  0x09, 0x01,            /* USAGE (Demo Kit)               */    
  0xa1, 0x01,            /* COLLECTION (Application)       */            
  /* 6 */
  
  /* LED1 */        
  0x85, LED1_REPORT_ID,  /*     REPORT_ID (1)		     */
  0x09, 0x01,            /*     USAGE (LED 1)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED1_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED1_REPORT_ID,  /*     REPORT_ID (1)              */
  0x09, 0x01,            /*     USAGE (LED 1)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 26 */
  
  /* LED2 */
  0x85, LED2_REPORT_ID,  /*     REPORT_ID 2		     */
  0x09, 0x02,            /*     USAGE (LED 2)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED2_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED2_REPORT_ID,  /*     REPORT_ID (2)              */
  0x09, 0x02,            /*     USAGE (LED 2)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 46 */
  
  /* LED3 */        
  0x85, LED3_REPORT_ID,  /*     REPORT_ID (3)		     */
  0x09, 0x03,            /*     USAGE (LED 3)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED3_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED3_REPORT_ID,  /*     REPORT_ID (3)              */
  0x09, 0x03,            /*     USAGE (LED 3)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 66 */
  
  /* LED4 */
  0x85, LED4_REPORT_ID,  /*     REPORT_ID 4)		     */
  0x09, 0x04,            /*     USAGE (LED 4)	             */
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */          
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */           
  0x75, 0x08,            /*     REPORT_SIZE (8)            */        
  0x95, LED4_REPORT_COUNT, /*     REPORT_COUNT (1)           */       
  0xB1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */     
  
  0x85, LED4_REPORT_ID,  /*     REPORT_ID (4)              */
  0x09, 0x04,            /*     USAGE (LED 4)              */
  0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol)  */
  /* 86 */
  
  /* key Push Button */  
  0x85, KEY_REPORT_ID,   /*     REPORT_ID (5)              */
  0x09, 0x05,            /*     USAGE (Push Button)        */      
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */      
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */      
  0x75, 0x01,            /*     REPORT_SIZE (1)            */  
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */   
  
  0x09, 0x05,            /*     USAGE (Push Button)        */               
  0x75, 0x01,            /*     REPORT_SIZE (1)            */           
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */  
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0x81, 0x83,            /*     INPUT (Cnst,Var,Abs,Vol)   */                    
  0x85, KEY_REPORT_ID,   /*     REPORT_ID (2)              */         
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0xb1, 0x83,            /*     FEATURE (Cnst,Var,Abs,Vol) */                      
  /* 114 */
  
  /* Tamper Push Button */  
  0x85, TAMPER_REPORT_ID,/*     REPORT_ID (6)              */
  0x09, 0x06,            /*     USAGE (Tamper Push Button) */      
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */      
  0x25, 0x01,            /*     LOGICAL_MAXIMUM (1)        */      
  0x75, 0x01,            /*     REPORT_SIZE (1)            */  
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */   
  
  0x09, 0x06,            /*     USAGE (Tamper Push Button) */               
  0x75, 0x01,            /*     REPORT_SIZE (1)            */           
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */  
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0x81, 0x83,            /*     INPUT (Cnst,Var,Abs,Vol)   */                    
  0x85, TAMPER_REPORT_ID,/*     REPORT_ID (6)              */         
  
  0x75, 0x07,            /*     REPORT_SIZE (7)            */           
  0xb1, 0x83,            /*     FEATURE (Cnst,Var,Abs,Vol) */  
  /* 142 */
  
  /* ADC IN */
  0x85, ADC_REPORT_ID,   /*     REPORT_ID                 */         
  0x09, 0x07,            /*     USAGE (ADC IN)             */          
  0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */               
  0x26, 0xff, 0x00,      /*     LOGICAL_MAXIMUM (255)      */                 
  0x75, 0x08,            /*     REPORT_SIZE (8)            */           
  0x81, 0x82,            /*     INPUT (Data,Var,Abs,Vol)   */                    
  0x85, ADC_REPORT_ID,   /*     REPORT_ID (7)              */                 
  0x09, 0x07,            /*     USAGE (ADC in)             */                     
  0xb1, 0x82,            /*     FEATURE (Data,Var,Abs,Vol) */                                 
  /* 161 */
  
  0xc0 	                 /*     END_COLLECTION	             */
}; 

USBD_CUSTOM_HID_ItfTypeDef USBD_CustomHID_fops = 
{
  CustomHID_ReportDesc,
  CustomHID_Init,
  CustomHID_DeInit,
  CustomHID_OutEvent,
};

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  CustomHID_Init
  *         Initializes the CUSTOM HID media low layer
  * @param  None
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CustomHID_Init(void)
{
  GPIO_InitTypeDef   GPIO_InitStructure;
  ADC_ChannelConfTypeDef sConfig;

  /* Configure the ADC peripheral */
  AdcHandle.Instance = ADCx;
  
  AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4;
  AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
  AdcHandle.Init.ScanConvMode = DISABLE;
  AdcHandle.Init.ContinuousConvMode = ENABLE;
  AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  AdcHandle.Init.NbrOfDiscConversion = 0;
  AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
  AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  AdcHandle.Init.NbrOfConversion = 1;
  AdcHandle.Init.DMAContinuousRequests = ENABLE;
  AdcHandle.Init.EOCSelection = DISABLE;
  HAL_ADC_Init(&AdcHandle);
   
  /* Configure ADC regular channel */  
  sConfig.Channel = ADCx_CHANNEL;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
  sConfig.Offset = 0;
  HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);

  /* Start the conversion process and enable interrupt */  
  HAL_ADC_Start_DMA(&AdcHandle, (uint32_t*)&ADCConvertedValue, 1);
  
  /* Configure LED1, LED2, LED3 and LED4 */
  /* BSP_LED_Init(LED1); *//* To use LED1, ensure that JP24 is in position 2-3, potentiometer is then no more usable */
  BSP_LED_Init(LED2);
  BSP_LED_Init(LED3);
  BSP_LED_Init(LED4);
  
  /* Enable GPIOC clock */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  
  /* Configure PC13 pin as input floating */
  GPIO_InitStructure.Mode = GPIO_MODE_IT_RISING_FALLING;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Pin = GPIO_PIN_13;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Enable and set EXTI15_10 Interrupt to the lowest priority */
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 3, 0);
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);
  
  return (0);
}

/**
  * @brief  CustomHID_DeInit
  *         DeInitializes the CUSTOM HID media low layer
  * @param  None
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CustomHID_DeInit(void)
{
  /*
  Add your de-initialization code here 
  */  
  return (0);
}


/**
  * @brief  CustomHID_OutEvent
  *         Manage the CUSTOM HID class Out Event    
  * @param  event_idx: LED Report Number
  * @param  state: LED states (ON/OFF)
  */
static int8_t CustomHID_OutEvent  (uint8_t event_idx, uint8_t state)
{ 
  switch(event_idx)
  {
  case 1: /* LED1 */
    (state == 1) ? BSP_LED_On(LED1) : BSP_LED_Off(LED1); 
    break;
    
  case 2: /* LED2 */
    (state == 1) ? BSP_LED_On(LED2) : BSP_LED_Off(LED2); 
    break;
  case 3: /* LED3 */
    (state == 1) ? BSP_LED_On(LED3) : BSP_LED_Off(LED3); 
    break;
  case 4: /* LED4 */
    (state == 1) ? BSP_LED_On(LED4) : BSP_LED_Off(LED4); 
    break;
    
  default:
    BSP_LED_Off(LED1);
    BSP_LED_Off(LED2);
    BSP_LED_Off(LED3);
    BSP_LED_Off(LED4); 
    break;
  }
  return (0);
}

/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == KEY_BUTTON_PIN)
  {
    SendBuffer[0] = KEY_REPORT_ID; 
    
    if(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
      SendBuffer[1] = 0x01;
    }
    else
    {
      SendBuffer[1] = 0x00;
    }
    USBD_CUSTOM_HID_SendReport(&USBD_Device, SendBuffer, 2);
  }
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/main.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   USB device CustomHID demo main file
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
USBD_HandleTypeDef USBD_Device;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Enable the CPU Cache */
  CPU_CACHE_Enable();
  
  /* STM32F7xx HAL library initialization:
       - Configure the Flash ART accelerator on ITCM interface
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();
  
  /* Configure the System clock to have a frequency of 216 MHz */
  SystemClock_Config();
    
  /* Initialize IO expander */
  BSP_IO_Init();

  /* Init Device Library */
  USBD_Init(&USBD_Device, &HID_Desc, 0);
  
  /* Add Supported Class */
  USBD_RegisterClass(&USBD_Device, &USBD_CUSTOM_HID);
  
  /* Add Custom HID callbacks */
  USBD_CUSTOM_HID_RegisterInterface(&USBD_Device, &USBD_CustomHID_fops);
  
  /* Start Device Process */
  USBD_Start(&USBD_Device);
  
  /* Run Application (Interrupt mode) */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow :
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 216000000
  *            HCLK(Hz)                       = 216000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 432
  *            PLL_P                          = 2
  *            PLLSAI_N                       = 384
  *            PLLSAI_P                       = 8
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 7
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
  
  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 432;  
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Activate the OverDrive to reach the 216 Mhz Frequency */
  if(HAL_PWREx_EnableOverDrive() != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Select PLLSAI output as USB clock source */
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48;
  PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLLSAIP;
  PeriphClkInitStruct.PLLSAI.PLLSAIN = 384;
  PeriphClkInitStruct.PLLSAI.PLLSAIQ = 7; 
  PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV8;
  if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct)  != HAL_OK)
  {
    Error_Handler();
  }
  
  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 
     clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* User may add here some code to deal with this error */
  while(1)
  {
  }
}

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

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

/**
  ******************************************************************************
  * @file    USB_Device/CustomHID_Standalone/Src/usbd_desc.c
  * @author  MCD Application Team
  * @version V1.0.2
  * @date    21-September-2015
  * @brief   This file provides the USBD descriptors and string formating method.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "usbd_core.h"
#include "usbd_desc.h"
#include "usbd_conf.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USBD_VID                      0x0483
#define USBD_PID                      0x5750
#define USBD_LANGID_STRING            0x409
#define USBD_MANUFACTURER_STRING      "STMicroelectronics"
#define USBD_PRODUCT_HS_STRING        "Custome HID in HS Mode"
#define USBD_PRODUCT_FS_STRING        "Custome HID in FS Mode"
#define USBD_CONFIGURATION_HS_STRING  "HID Config"
#define USBD_INTERFACE_HS_STRING      "HID Interface"
#define USBD_CONFIGURATION_FS_STRING  "HID Config"
#define USBD_INTERFACE_FS_STRING      "HID Interface"

/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ManufacturerStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ProductStrDescriptor (USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
#ifdef USB_SUPPORT_USER_STRING_DESC
uint8_t *USBD_HID_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);  
#endif /* USB_SUPPORT_USER_STRING_DESC */  

/* Private variables ---------------------------------------------------------*/
USBD_DescriptorsTypeDef HID_Desc = {
  USBD_HID_DeviceDescriptor,
  USBD_HID_LangIDStrDescriptor, 
  USBD_HID_ManufacturerStrDescriptor,
  USBD_HID_ProductStrDescriptor,
  USBD_HID_SerialStrDescriptor,
  USBD_HID_ConfigStrDescriptor,
  USBD_HID_InterfaceStrDescriptor,
};

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
  0x12,                       /* bLength */
  USB_DESC_TYPE_DEVICE,       /* bDescriptorType */
  0x00,                       /* bcdUSB */
  0x02,
  0x00,                       /* bDeviceClass */
  0x00,                       /* bDeviceSubClass */
  0x00,                       /* bDeviceProtocol */
  USB_MAX_EP0_SIZE,           /* bMaxPacketSize */
  LOBYTE(USBD_VID),           /* idVendor */
  HIBYTE(USBD_VID),           /* idVendor */
  LOBYTE(USBD_PID),           /* idVendor */
  HIBYTE(USBD_PID),           /* idVendor */
  0x00,                       /* bcdDevice rel. 2.00 */
  0x02,
  USBD_IDX_MFC_STR,           /* Index of manufacturer string */
  USBD_IDX_PRODUCT_STR,       /* Index of product string */
  USBD_IDX_SERIAL_STR,        /* Index of serial number string */
  USBD_MAX_NUM_CONFIGURATION  /* bNumConfigurations */
}; /* USB_DeviceDescriptor */

/* USB Standard Device Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = {
  USB_LEN_LANGID_STR_DESC,         
  USB_DESC_TYPE_STRING,       
  LOBYTE(USBD_LANGID_STRING),
  HIBYTE(USBD_LANGID_STRING), 
};

uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] =
{
  USB_SIZ_STRING_SERIAL,      
  USB_DESC_TYPE_STRING,    
};

#if defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4   
#endif
__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;

/* Private functions ---------------------------------------------------------*/
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);
static void Get_SerialNum(void);

/**
  * @brief  Returns the device descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_DeviceDesc);
  return (uint8_t*)USBD_DeviceDesc;
}

/**
  * @brief  Returns the LangID string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = sizeof(USBD_LangIDDesc);  
  return (uint8_t*)USBD_LangIDDesc;
}

/**
  * @brief  Returns the product string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {   
    USBD_GetString((uint8_t *)(uint8_t *)USBD_PRODUCT_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_PRODUCT_FS_STRING, USBD_StrDesc, length);    
  }
  return USBD_StrDesc;
}

/**
  * @brief  Returns the manufacturer string descriptor. 
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  USBD_GetString((uint8_t *)(uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
  return USBD_StrDesc;
}

/**
  * @brief  Returns the serial number string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  *length = USB_SIZ_STRING_SERIAL;
  
  /* Update the serial number string descriptor with the data from the unique ID*/
  Get_SerialNum();
  
  return (uint8_t*)USBD_StringSerial;
}

/**
  * @brief  Returns the configuration string descriptor.    
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {  
    USBD_GetString((uint8_t *)(uint8_t *)USBD_CONFIGURATION_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_CONFIGURATION_FS_STRING, USBD_StrDesc, length); 
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Returns the interface string descriptor.        
  * @param  speed: Current device speed
  * @param  length: Pointer to data length variable
  * @retval Pointer to descriptor buffer
  */
uint8_t *USBD_HID_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == USBD_SPEED_HIGH)
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_INTERFACE_HS_STRING, USBD_StrDesc, length);
  }
  else
  {
    USBD_GetString((uint8_t *)(uint8_t *)USBD_INTERFACE_FS_STRING, USBD_StrDesc, length);
  }
  return USBD_StrDesc;  
}

/**
  * @brief  Create the serial number string descriptor 
  * @param  None 
  * @retval None
  */
static void Get_SerialNum(void)
{
  uint32_t deviceserial0, deviceserial1, deviceserial2;
  
  deviceserial0 = *(uint32_t*)DEVICE_ID1;
  deviceserial1 = *(uint32_t*)DEVICE_ID2;
  deviceserial2 = *(uint32_t*)DEVICE_ID3;
  
  deviceserial0 += deviceserial2;
  
  if (deviceserial0 != 0)
  {
    IntToUnicode (deviceserial0, &USBD_StringSerial[2] ,8);
    IntToUnicode (deviceserial1, &USBD_StringSerial[18] ,4);
  }
}

/**
  * @brief  Convert Hex 32Bits value into char 
  * @param  value: value to convert
  * @param  pbuf: pointer to the buffer 
  * @param  len: buffer length
  * @retval None
  */
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)
{
  uint8_t idx = 0;
  
  for( idx = 0; idx < len; idx ++)
  {
    if( ((value >> 28)) < 0xA )
    {
      pbuf[ 2* idx] = (value >> 28) + '0';
    }
    else
    {
      pbuf[2* idx] = (value >> 28) + 'A' - 10; 
    }
    
    value = value << 4;
    
    pbuf[ 2* idx + 1] = 0;
  }
}

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

  /* Run Application (Interrupt mode) */
  while (1)
  {
  }

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == KEY_BUTTON_PIN)
  {
    SendBuffer[0] = KEY_REPORT_ID;
   
    if(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
      SendBuffer[1] = 0x01;
    }
    else
    {
      SendBuffer[1] = 0x00;
    }
    USBD_CUSTOM_HID_SendReport(&USBD_Device, SendBuffer, 2);
  }
}

static int8_t CustomHID_OutEvent  (uint8_t event_idx, uint8_t state)
{ 
  switch(event_idx)
  {
  case 1: /* LED1 */
    (state == 1) ? BSP_LED_On(LED1) : BSP_LED_Off(LED1); 
    break;
    
  case 2: /* LED2 */
    (state == 1) ? BSP_LED_On(LED2) : BSP_LED_Off(LED2); 
    break;
  case 3: /* LED3 */
    (state == 1) ? BSP_LED_On(LED3) : BSP_LED_Off(LED3); 
    break;
  case 4: /* LED4 */
    (state == 1) ? BSP_LED_On(LED4) : BSP_LED_Off(LED4); 
    break;
    
  default:
    BSP_LED_Off(LED1);
    BSP_LED_Off(LED2);
    BSP_LED_Off(LED3);
    BSP_LED_Off(LED4); 
    break;
  }
  return (0);
}