path: root/Projects/P-NUCLEO-WB55.Nucleo/Applications/USB_Device/CDC_Standalone/USB_Device/App/usbd_cdc_if.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           USB_Device/CDC_Standalone/USB_Device/App/usbd_cdc_if.c
  * @author         MCD Application Team
  * @brief          This file implements the USB device descriptors.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */
/* USER CODE END Header */

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

/* USER CODE BEGIN INCLUDE */
#include "main.h"
/* USER CODE END INCLUDE */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

/* USER CODE END PV */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
  * @brief Usb device library.
  * @{
  */

/** @addtogroup USBD_CDC_IF
  * @{
  */

/** @defgroup USBD_CDC_IF_Private_TypesDefinitions USBD_CDC_IF_Private_TypesDefinitions
  * @brief Private types.
  * @{
  */

/* USER CODE BEGIN PRIVATE_TYPES */

/* USER CODE END PRIVATE_TYPES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Defines USBD_CDC_IF_Private_Defines
  * @brief Private defines.
  * @{
  */

/* USER CODE BEGIN PRIVATE_DEFINES */

/* USER CODE END PRIVATE_DEFINES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Macros USBD_CDC_IF_Private_Macros
  * @brief Private macros.
  * @{
  */

/* USER CODE BEGIN PRIVATE_MACRO */

/* USER CODE END PRIVATE_MACRO */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Variables USBD_CDC_IF_Private_Variables
  * @brief Private variables.
  * @{
  */
/* 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];

/* USER CODE BEGIN PRIVATE_VARIABLES */
USBD_CDC_LineCodingTypeDef LineCoding =
{
  115200, /* baud rate*/
  0x00,   /* stop bits-1*/
  0x00,   /* parity - none*/
  0x08    /* nb. of bits 8*/
};
uint32_t BuffLength;
uint32_t UserTxBufPtrIn;/* Increment this pointer or roll it back to
                               start address when data are received over USART */
uint32_t UserTxBufPtrOut; /* Increment this pointer or roll it back to
                                 start address when data are sent over USB */

__IO uint32_t uwPrescalerValue;
/* USER CODE END PRIVATE_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
  * @brief Public variables.
  * @{
  */

extern USBD_HandleTypeDef hUsbDeviceFS;

/* USER CODE BEGIN EXPORTED_VARIABLES */
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
/* TIM handler declaration */
TIM_HandleTypeDef  TimHandle;
/* USB handler declaration */
/* USER CODE END EXPORTED_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_FunctionPrototypes USBD_CDC_IF_Private_FunctionPrototypes
  * @brief Private functions declaration.
  * @{
  */

static int8_t CDC_Init_FS(void);
static int8_t CDC_DeInit_FS(void);
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length);
static int8_t CDC_Receive_FS(uint8_t* pbuf, uint32_t *Len);
static int8_t CDC_TransmitCplt_FS(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);

/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */
 void TIM_Config(void);
 static void ComPort_Config(void);
/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */

/**
  * @}
  */

USBD_CDC_ItfTypeDef USBD_Interface_fops_FS =
{
  CDC_Init_FS,
  CDC_DeInit_FS,
  CDC_Control_FS,
  CDC_Receive_FS,
  CDC_TransmitCplt_FS
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Initializes the CDC media low layer over the FS USB IP
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Init_FS(void)
{
  /* USER CODE BEGIN 3 */
  /*##-1- Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* USART configured as follow:
      - Word Length = 8 Bits
      - Stop Bit    = One Stop bit
      - Parity      = No parity
      - BaudRate    = 115200 baud
      - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance          = USARTx;
  UartHandle.Init.BaudRate     = 115200;
  UartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits     = UART_STOPBITS_1;
  UartHandle.Init.Parity       = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode         = UART_MODE_TX_RX;

  if(HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-2- Put UART peripheral in IT reception process ########################*/
  /* Any data received will be stored in "UserTxBufferFS" buffer  */
  if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)UserTxBufferFS, 1) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }

  /*##-3- Configure the TIM Base generation  #################################*/
  TIM_Config();

  /*##-5- Set Application Buffers ############################################*/
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, 0);
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, UserRxBufferFS);
  return (USBD_OK);
  /* USER CODE END 3 */
}

/**
  * @brief  DeInitializes the CDC media low layer
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_DeInit_FS(void)
{
  /* USER CODE BEGIN 4 */
  /* DeInitialize the UART peripheral */
  if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
  return (USBD_OK);
  /* USER CODE END 4 */
}

/**
  * @brief  Manage the CDC class requests
  * @param  cmd: Command code
  * @param  pbuf: Buffer containing command data (request parameters)
  * @param  length: 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 CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length)
{
  /* USER CODE BEGIN 5 */
  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];

    /* Set the new configuration */
    ComPort_Config();
    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;
    break;

    case CDC_SET_CONTROL_LINE_STATE:
    /* Add your code here */

    break;

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

  default:
    break;
  }

  return (USBD_OK);
  /* USER CODE END 5 */
}

/**
  * @brief  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 CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
  /* USER CODE BEGIN 6 */
  HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
  return (USBD_OK);
  /* USER CODE END 6 */
}

/**
  * @brief  CDC_Transmit_FS
  *         Data to send over USB IN endpoint are sent over CDC interface
  *         through this function.
  *         @note
  *
  *
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @retval USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
  */
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 7 */
  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);
  /* USER CODE END 7 */
  return result;
}

/**
  * @brief  CDC_TransmitCplt_FS
  *         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 CDC_TransmitCplt_FS(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 13 */
  UNUSED(Buf);
  UNUSED(Len);
  UNUSED(epnum);
  /* USER CODE END 13 */
  return result;
}

/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
/**
  * @brief  Tx Transfer completed callback
  * @param  huart: UART handle
  * @retval None
  */
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
  /* Initiate next USB packet transfer once UART completes transfer (transmitting data over Tx line) */
  USBD_CDC_ReceivePacket(&hUsbDeviceFS);
}

/**
  * @brief  ComPort_Config
  *         Configure the COM Port with the parameters received from host.
  * @param  None.
  * @retval None.
  * @note   When a configuration is not supported, a default value is used.
  */
static void ComPort_Config(void)
{
  if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /* set the Stop bit */
  switch (LineCoding.format)
  {
  case 0:
    UartHandle.Init.StopBits = UART_STOPBITS_1;
    break;
  case 2:
    UartHandle.Init.StopBits = UART_STOPBITS_2;
    break;
  default :
    UartHandle.Init.StopBits = UART_STOPBITS_1;
    break;
  }

  /* set the parity bit*/
  switch (LineCoding.paritytype)
  {
  case 0:
    UartHandle.Init.Parity = UART_PARITY_NONE;
    break;
  case 1:
    UartHandle.Init.Parity = UART_PARITY_ODD;
    break;
  case 2:
    UartHandle.Init.Parity = UART_PARITY_EVEN;
    break;
  default :
    UartHandle.Init.Parity = UART_PARITY_NONE;
    break;
  }

  /*set the data type : only 8bits and 9bits is supported */
  switch (LineCoding.datatype)
  {
  case 0x07:
    /* With this configuration a parity (Even or Odd) must be set */
    UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
    break;
  case 0x08:
    if(UartHandle.Init.Parity == UART_PARITY_NONE)
    {
      UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
    }
    else
    {
      UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
    }

    break;
  default :
    UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
    break;
  }

  UartHandle.Init.BaudRate     = LineCoding.bitrate;
  UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode         = UART_MODE_TX_RX;
  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;

  if(HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /* Start reception: provide the buffer pointer with offset and the buffer size */
  HAL_UART_Receive_IT(&UartHandle, (uint8_t *)(UserTxBufferFS + UserTxBufPtrIn), 1);
}

/**
  * @brief  TIM_Config: Configure TIMx timer
  * @param  None.
  * @retval None.
  */
 void TIM_Config(void)
{
   /*##-1- Configure the TIM peripheral #######################################*/
  /* -----------------------------------------------------------------------
    In this example TIM2 input clock (TIM2CLK)  is set to APB1 clock (PCLK1),
    since APB1 prescaler is equal to 1.
      TIM2CLK = PCLK1
      PCLK1 = HCLK
      => TIM2CLK = HCLK = SystemCoreClock
    To get TIM2 counter clock at 10 KHz, the Prescaler is computed as following:
    Prescaler = (TIM2CLK / TIM2 counter clock) - 1
    Prescaler = (SystemCoreClock /10 KHz) - 1

    Note:
     SystemCoreClock variable holds HCLK frequency and is defined in system_stm32wbxx.c file.
     Each time the core clock (HCLK) changes, user had to update SystemCoreClock
     variable value. Otherwise, any configuration based on this variable will be incorrect.
     This variable is updated in three ways:
      1) by calling CMSIS function SystemCoreClockUpdate()
      2) by calling HAL API function HAL_RCC_GetSysClockFreq()
      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
  ----------------------------------------------------------------------- */

  /* Compute the prescaler value to have TIMx counter clock equal to 10000 Hz */
  uwPrescalerValue = (uint32_t)(SystemCoreClock / 10000) - 1;

  /* Set TIMx instance */
  TimHandle.Instance = TIMx;

  /* Initialize TIMx peripheral as follows:
       + Period = 10000 - 1
       + Prescaler = (SystemCoreClock/10000) - 1
       + ClockDivision = 0
       + Counter direction = Up
  */
  TimHandle.Init.Period            = 10000 - 1;
  TimHandle.Init.Prescaler         = uwPrescalerValue;
  TimHandle.Init.ClockDivision     = 0;
  TimHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
  TimHandle.Init.RepetitionCounter = 0;
  TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-2- Start the TIM Base generation in interrupt mode ####################*/
  /* Start Channel1 */
  if (HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
  {
    /* Starting Error */
    Error_Handler();
  }
}

/**
  * @brief  UART error callbacks
  * @param  UartHandle: UART handle
  * @retval None
  */
void HAL_UART_ErrorCallback(UART_HandleTypeDef *UartHandle)
{
  /* Transfer error occurred in reception and/or transmission process */
  Error_Handler();
}

/**
  * @brief  TIM period elapsed callback
  * @param  htim: TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  uint32_t buffptr;
  uint32_t buffsize;

  if(UserTxBufPtrOut != UserTxBufPtrIn)
  {
    if(UserTxBufPtrOut > UserTxBufPtrIn) /* Rollback */
    {
      buffsize = APP_RX_DATA_SIZE - UserTxBufPtrOut;
    }
    else
    {
      buffsize = UserTxBufPtrIn - UserTxBufPtrOut;
    }

    buffptr = UserTxBufPtrOut;

    USBD_CDC_SetTxBuffer(&hUsbDeviceFS, (uint8_t*)&UserTxBufferFS[buffptr], buffsize);

    if(USBD_CDC_TransmitPacket(&hUsbDeviceFS) == USBD_OK)
    {
      UserTxBufPtrOut += buffsize;
      if (UserTxBufPtrOut == APP_RX_DATA_SIZE)
      {
        UserTxBufPtrOut = 0;
      }
    }
  }
}
/**
  * @brief  Rx Transfer completed callback
  * @param  huart: UART handle
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  /* Increment Index for buffer writing */
  UserTxBufPtrIn++;

  /* To avoid buffer overflow */
  if(UserTxBufPtrIn == APP_RX_DATA_SIZE)
  {
    UserTxBufPtrIn = 0;
  }

  /* Start another reception: provide the buffer pointer with offset and the buffer size */
  HAL_UART_Receive_IT(huart, (uint8_t *)(UserTxBufferFS + UserTxBufPtrIn), 1);


}
/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */

/**
  * @}
  */

/**
  * @}
  */

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