/**
  ******************************************************************************
  * @file    USB_Device/CDC_Standalone/Src/usbd_desc.c
  * @author  MCD Application Team
  * @version V1.4.2
  * @date    13-November-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                      0x5740
#define USBD_LANGID_STRING            0x409
#define USBD_MANUFACTURER_STRING      "STMicroelectronics"
#define USBD_PRODUCT_HS_STRING        "STM32 Virtual ComPort in HS Mode"
#define USBD_PRODUCT_FS_STRING        "STM32 Virtual ComPort in FS Mode"
#define USBD_CONFIGURATION_HS_STRING  "VCP Config"
#define USBD_INTERFACE_HS_STRING      "VCP Interface"
#define USBD_CONFIGURATION_FS_STRING  "VCP Config"
#define USBD_INTERFACE_FS_STRING      "VCP Interface"

/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
uint8_t *USBD_VCP_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_VCP_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
#ifdef USB_SUPPORT_USER_STRING_DESC
uint8_t *USBD_VCP_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx, uint16_t *length);  
#endif /* USB_SUPPORT_USER_STRING_DESC */  

/* Private variables ---------------------------------------------------------*/
USBD_DescriptorsTypeDef VCP_Desc = {
  USBD_VCP_DeviceDescriptor,
  USBD_VCP_LangIDStrDescriptor, 
  USBD_VCP_ManufacturerStrDescriptor,
  USBD_VCP_ProductStrDescriptor,
  USBD_VCP_SerialStrDescriptor,
  USBD_VCP_ConfigStrDescriptor,
  USBD_VCP_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_VCP_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_VCP_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_VCP_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == 0)
  {   
    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_VCP_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_VCP_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_VCP_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_VCP_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
  if(speed == 0)
  {
    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****/

