stm32-mw-usb-device/Class/CDC/Src/usbd_cdc_if.c

/**
  ******************************************************************************
  * @file    usbd_cdc_if_template.c
  * @author  MCD Application Team
  * @brief   Generic media access Layer.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

/* BSPDependencies
- "stm32xxxxx_{eval}{discovery}{nucleo_144}.c"
- "stm32xxxxx_{eval}{discovery}_io.c"
EndBSPDependencies */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_if.h"

/** @addtogroup STM32_USB_DEVICE_LIBRARY
  * @{
  */


/** @defgroup USBD_CDC
  * @brief usbd core module
  * @{
  */

/** @defgroup USBD_CDC_Private_TypesDefinitions
  * @{
  */
/**
  * @}
  */


/** @defgroup USBD_CDC_Private_Defines
  * @{
  */
/**
  * @}
  */


/** @defgroup USBD_CDC_Private_Macros
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_CDC_Private_FunctionPrototypes
  * @{
  */

static int8_t TEMPLATE_Init(void);
static int8_t TEMPLATE_DeInit(void);
static int8_t TEMPLATE_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length);
static int8_t TEMPLATE_Receive(uint8_t *pbuf, uint32_t *Len);
static int8_t TEMPLATE_TransmitCplt(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);

USBD_CDC_ItfTypeDef USBD_CDC_Template_fops =
{
  TEMPLATE_Init,
  TEMPLATE_DeInit,
  TEMPLATE_Control,
  TEMPLATE_Receive,
  TEMPLATE_TransmitCplt
};

USBD_CDC_LineCodingTypeDef linecoding =
{
  115200, /* baud rate*/
  0x00,   /* stop bits-1*/
  0x00,   /* parity - none*/
  0x08    /* nb. of bits 8*/
};

/* Create buffer for reception and transmission           */
/* It's up to user to redefine and/or remove those define */
/** Received data over USB are stored in this buffer      */
uint8_t UserRxBufferFS[APP_RX_DATA_SIZE];
/** Data to send over USB CDC are stored in this buffer   */
uint8_t UserTxBufferFS[APP_TX_DATA_SIZE];
extern USBD_HandleTypeDef hUsbDeviceFS;

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

__weak void TEMPLATE_ReceiveUserspace(uint8_t *Buf, uint32_t *Len)
{

}

/**
  * @brief  TEMPLATE_Init
  *         Initializes the CDC media low layer
  * @param  None
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t TEMPLATE_Init(void)
{
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, 0);
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, UserRxBufferFS);
  return (0);
}

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


/**
  * @brief  TEMPLATE_Control
  *         Manage the CDC class requests
  * @param  Cmd: Command code
  * @param  Buf: Buffer containing command data (request parameters)
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t TEMPLATE_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length)
{
  UNUSED(length);

  switch (cmd)
  {
    case CDC_SEND_ENCAPSULATED_COMMAND:
      /* Add your code here */
      break;

    case CDC_GET_ENCAPSULATED_RESPONSE:
      /* Add your code here */
      break;

    case CDC_SET_COMM_FEATURE:
      /* Add your code here */
      break;

    case CDC_GET_COMM_FEATURE:
      /* Add your code here */
      break;

    case CDC_CLEAR_COMM_FEATURE:
      /* Add your code here */
      break;

    case CDC_SET_LINE_CODING:
      linecoding.bitrate    = (uint32_t)(pbuf[0] | (pbuf[1] << 8) | \
                                         (pbuf[2] << 16) | (pbuf[3] << 24));
      linecoding.format     = pbuf[4];
      linecoding.paritytype = pbuf[5];
      linecoding.datatype   = pbuf[6];

      /* Add your code here */
      break;

    case CDC_GET_LINE_CODING:
      pbuf[0] = (uint8_t)(linecoding.bitrate);
      pbuf[1] = (uint8_t)(linecoding.bitrate >> 8);
      pbuf[2] = (uint8_t)(linecoding.bitrate >> 16);
      pbuf[3] = (uint8_t)(linecoding.bitrate >> 24);
      pbuf[4] = linecoding.format;
      pbuf[5] = linecoding.paritytype;
      pbuf[6] = linecoding.datatype;

      /* Add your code here */
      break;

    case CDC_SET_CONTROL_LINE_STATE:
      /* Add your code here */
      break;

    case CDC_SEND_BREAK:
      /* Add your code here */
      break;

    default:
      break;
  }

  return (0);
}

/**
  * @brief  TEMPLATE_Receive
  *         Data received over USB OUT endpoint are sent over CDC interface
  *         through this function.
  *
  *         @note
  *         This function will issue a NAK packet on any OUT packet received on
  *         USB endpoint until exiting this function. If you exit this function
  *         before transfer is complete on CDC interface (ie. using DMA controller)
  *         it will result in receiving more data while previous ones are still
  *         not sent.
  *
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t TEMPLATE_Receive(uint8_t *Buf, uint32_t *Len)
{
  UNUSED(Buf);
  UNUSED(Len);
  
  TEMPLATE_ReceiveUserspace(*Buf, *Len);
  
  USBD_CDC_ReceivePacket(&hUsbDeviceFS);
  return (USBD_OK);
}

uint8_t TEMPLATE_Transmit(uint8_t* Buf, uint16_t Len)
{
  uint8_t result = USBD_OK;
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef*)hUsbDeviceFS.pClassData;
  if (hcdc->TxState != 0){
    return
             USBD_BUSY;
  }
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, Buf, Len);
  result = USBD_CDC_TransmitPacket(&hUsbDeviceFS);
  return result;
}

/**
  * @brief  TEMPLATE_TransmitCplt
  *         Data transmitted callback
  *
  *         @note
  *         This function is IN transfer complete callback used to inform user that
  *         the submitted Data is successfully sent over USB.
  *
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t TEMPLATE_TransmitCplt(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
   UNUSED(Buf);
   UNUSED(Len);
   UNUSED(epnum);

  return (0);
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */