usbd_cdc_vcp_v1.c

/**
  ******************************************************************************
  * @file    usbd_cdc_vcp.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    22-July-2011

  * @brief   Generic media access Layer.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>












  ******************************************************************************
  */ 

#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED 
#pragma     data_alignment = 4 
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_vcp.h"
#include "stm32f4_discovery.h"













/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
LINE_CODING linecoding =
  {
    115200, /* baud rate*/
    0x00,   /* stop bits-1*/
    0x00,   /* parity - none*/
    0x08    /* nb. of bits 8*/
  };


USART_InitTypeDef USART_InitStructure;

/* These are external variables imported from CDC core to be used for IN 
   transfer management. */
extern uint8_t  APP_Rx_Buffer []; /* Write CDC received data in this buffer.
                                     These data will be sent over USB IN endpoint
                                     in the CDC core functions. */
extern uint32_t APP_Rx_ptr_in;    /* Increment this pointer or roll it back to
                                     start address when writing received data
                                     in the buffer APP_Rx_Buffer. */

/* Private function prototypes -----------------------------------------------*/
void USART1_IRQHandler(void);
static uint16_t VCP_Init     (void);
static uint16_t VCP_DeInit   (void);
static uint16_t VCP_Ctrl     (uint32_t Cmd, uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataTx   (uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataRx   (uint8_t* Buf, uint32_t Len);

static uint16_t VCP_COMConfig(uint8_t Conf);
void EXTI0_IRQHandler(void);//EXTI0_IRQn


CDC_IF_Prop_TypeDef VCP_fops = 
{
  VCP_Init,
  VCP_DeInit,
  VCP_Ctrl,
  VCP_DataTx,
  VCP_DataRx
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  VCP_Init
  *         Initializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Init(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* DISCOVERY_COM default configuration */
  /* DISCOVERY_COM configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - Parity Odd
        - Hardware flow control disabled
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_Odd;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  /* Configure and enable the USART */
  USART_Init(COM1, &USART_InitStructure);

  /* Enable the USART Receive interrupt */
  USART_ITConfig(COM1, USART_IT_RXNE, ENABLE);

  /* Enable USART Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  return USBD_OK;
}

/**
  * @brief  VCP_DeInit
  *         DeInitializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_DeInit(void)
{

  return USBD_OK;
}


/**
  * @brief  VCP_Ctrl
  *         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 opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len)
{ 
  switch (Cmd)
  {
  case SEND_ENCAPSULATED_COMMAND:
    /* Not  needed for this driver */
    break;

  case GET_ENCAPSULATED_RESPONSE:
    /* Not  needed for this driver */
    break;

  case SET_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case GET_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case CLEAR_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case SET_LINE_CODING:
    linecoding.bitrate = (uint32_t)(Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24));
    linecoding.format = Buf[4];
    linecoding.paritytype = Buf[5];
    linecoding.datatype = Buf[6];
    /* Set the new configuration */
    VCP_COMConfig(OTHER_CONFIG);
    break;

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

  case SET_CONTROL_LINE_STATE:
    /* Not  needed for this driver */
    break;

  case SEND_BREAK:
    /* Not  needed for this driver */
    break;    
    
  default:
    break;
  }

  return USBD_OK;
}

/**
  * @brief  VCP_DataTx
  *         CDC received data to be send over USB IN endpoint are managed in 
  *         this function.
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len)
{
	/* puvodni verze realizujici presmerovani USART portu na USB virtualni port */
	/*
  	if (linecoding.datatype == 7)
  	{

  	    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(COM1) & 0x7F;
  	}

  	else if (linecoding.datatype == 8)
	{
		APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(COM1);
	}
	*/

	/* ****************************************************************** */
	/* nova verze reagujici na stisk tlacitka */
	
	  if (linecoding.datatype == 7)
  {
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
  }
  else if (linecoding.datatype == 8)
  {
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
  }
//  	if (linecoding.datatype == 7)
//  	{
//  	    APP_Rx_Buffer[APP_Rx_ptr_in] = (uint8_t) Len & 0x7F;
//  	}
//  	else if (linecoding.datatype == 8)
//	{
//		APP_Rx_Buffer[APP_Rx_ptr_in] = (uint8_t) Len ;
//	}
	/* ****************************************************************** */

	APP_Rx_ptr_in++;
  


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

	return USBD_OK;
}

/**
  * @brief  VCP_DataRx
  *         Data received over USB OUT endpoint are sent over CDC interface 
  *         through this function.
  *           
  *         @note
  *         This function will block any OUT packet reception on USB endpoint 
  *         untill 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 opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len)
{
	uint32_t i;

	/* puvodni verze realizujici presmerovani USART portu na USB virtualni port */
	/*

	for (i = 0; i < Len; i++)
	{
		USART_SendData(DISCOVERY_COM, *(Buf + i) );
		while(USART_GetFlagStatus(COM1, USART_FLAG_TXE) == RESET);
	}
	*/

	/* ****************************************************************** */
	/* nova verze ktera rozsviti LED6 pokud prijde 'a' nebo 'A'
	 * a zhasne led pokud prije 's' nebo 'S' */
	for (i = 0; i < Len; i++)
	{
		if (*(Buf + i) == 'a' || *(Buf + i) == 'A' )
		{
			STM_EVAL_LEDOn(LED6);
		}
		else if (*(Buf + i) == 's' || *(Buf + i) == 'S' )
		{
			STM_EVAL_LEDOff(LED6);
		}
	}


	return USBD_OK;
}

/**
  * @brief  VCP_COMConfig
  *         Configure the COM Port with default values or values received from host.
  * @param  Conf: can be DEFAULT_CONFIG to set the default configuration or OTHER_CONFIG
  *         to set a configuration received from the host.
  * @retval None.
  */
static uint16_t VCP_COMConfig(uint8_t Conf)
{
  if (Conf == DEFAULT_CONFIG)  
  {
    /* DISCOVERY_COM default configuration */
    /* DISCOVERY_COM configured as follow:
    - BaudRate = 115200 baud  
    - Word Length = 8 Bits
    - One Stop Bit
    - Parity Odd
    - Hardware flow control disabled
    - Receive and transmit enabled
    */
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_Odd;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
    /* Configure and enable the USART */
    USART_Init(COM1, &USART_InitStructure);
    
    /* Enable the USART Receive interrupt */
    USART_ITConfig(COM1, USART_IT_RXNE, ENABLE);
  }
  else
  {
    /* set the Stop bit*/
    switch (linecoding.format)
    {
    case 0:
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      break;
    case 1:
      USART_InitStructure.USART_StopBits = USART_StopBits_1_5;
      break;
    case 2:
      USART_InitStructure.USART_StopBits = USART_StopBits_2;
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    /* set the parity bit*/
    switch (linecoding.paritytype)
    {
    case 0:
      USART_InitStructure.USART_Parity = USART_Parity_No;
      break;
    case 1:
      USART_InitStructure.USART_Parity = USART_Parity_Even;
      break;
    case 2:
      USART_InitStructure.USART_Parity = USART_Parity_Odd;
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    /*set the data type : only 8bits and 9bits is supported */
    switch (linecoding.datatype)
    {
    case 0x07:
      /* With this configuration a parity (Even or Odd) should be set */
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      break;
    case 0x08:
      if (USART_InitStructure.USART_Parity == USART_Parity_No)
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      }
      else 
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_9b;
      }
      
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    USART_InitStructure.USART_BaudRate = linecoding.bitrate;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
    /* Configure and enable the USART */
    USART_Init(COM1, &USART_InitStructure);
  }
  return USBD_OK;
}

/**
  * @brief  DISCOVERY_COM_IRQHandler
  *         
  * @param  None.
  * @retval None.
  */
void USART1_IRQHandler(void)
{
  if (USART_GetITStatus(COM1, USART_IT_RXNE) != RESET)
  {
    /* Send the received data to the PC Host*/
    //VCP_DataTx (0,0);
		VCP_DataTx (0, (uint32_t) 'A');
  }

  /* If overrun condition occurs, clear the ORE flag and recover communication */
  if (USART_GetFlagStatus(COM1, USART_FLAG_ORE) != RESET)
  {
    (void)USART_ReceiveData(COM1);
  }
}

/**
  * @brief  DISCOVERY_COM_IRQHandler
  *
  * @param  None.
  * @retval None.
  */
//void DISCOVERY_EXTI_IRQHandler(void)
//{
//	VCP_DataTx (0, (uint32_t) 'A');
//}
void EXTI0_IRQHandler(void)//EXTI0_IRQn
{
	
	VCP_DataTx (0, (uint32_t) 'A');
	//STM_EVAL_LEDOn(LED6);
}


/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/