path: root/ports/stm32/usbhost/Core/Src/usbh_ctlreq.c

/**
  ******************************************************************************
  * @file    usbh_ctlreq.c 
  * @author  MCD Application Team
  * @version V3.0.0
  * @date    18-February-2014
  * @brief   This file implements the control requests for device enumeration
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 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 "usbh_ctlreq.h"

/** @addtogroup USBH_LIB
* @{
*/

/** @addtogroup USBH_LIB_CORE
* @{
*/

/** @defgroup USBH_CTLREQ 
* @brief This file implements the standard requests for device enumeration
* @{
*/


/** @defgroup USBH_CTLREQ_Private_Defines
* @{
*/ 
/**
* @}
*/ 


/** @defgroup USBH_CTLREQ_Private_TypesDefinitions
* @{
*/ 
/**
* @}
*/ 



/** @defgroup USBH_CTLREQ_Private_Macros
* @{
*/ 
/**
* @}
*/ 


/** @defgroup USBH_CTLREQ_Private_Variables
* @{
*/
/**
* @}
*/ 

/** @defgroup USBH_CTLREQ_Private_FunctionPrototypes
* @{
*/
static USBH_StatusTypeDef USBH_HandleControl (USBH_HandleTypeDef *phost);

static void USBH_ParseDevDesc (USBH_DevDescTypeDef* , uint8_t *buf, uint16_t length);

static void USBH_ParseCfgDesc (USBH_CfgDescTypeDef* cfg_desc,
                               uint8_t *buf, 
                               uint16_t length);


static void USBH_ParseEPDesc (USBH_EpDescTypeDef  *ep_descriptor, uint8_t *buf);
static void USBH_ParseStringDesc (uint8_t* psrc, uint8_t* pdest, uint16_t length);
static void USBH_ParseInterfaceDesc (USBH_InterfaceDescTypeDef  *if_descriptor, uint8_t *buf);


/**
* @}
*/ 


/** @defgroup USBH_CTLREQ_Private_Functions
* @{
*/ 


/**
  * @brief  USBH_Get_DevDesc
  *         Issue Get Device Descriptor command to the device. Once the response 
  *         received, it parses the device descriptor and updates the status.
  * @param  phost: Host Handle
  * @param  length: Length of the descriptor
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_Get_DevDesc(USBH_HandleTypeDef *phost, uint8_t length)
{
  USBH_StatusTypeDef status;
  
  if((status = USBH_GetDescriptor(phost,
                                  USB_REQ_RECIPIENT_DEVICE | USB_REQ_TYPE_STANDARD,                          
                                  USB_DESC_DEVICE, 
                                  phost->device.Data,
                                  length)) == USBH_OK)
  {
    /* Commands successfully sent and Response Received */       
    USBH_ParseDevDesc(&phost->device.DevDesc, phost->device.Data, length);
  }
  return status;      
}

/**
  * @brief  USBH_Get_CfgDesc
  *         Issues Configuration Descriptor to the device. Once the response 
  *         received, it parses the configuartion descriptor and updates the 
  *         status.
  * @param  phost: Host Handle
  * @param  length: Length of the descriptor
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_Get_CfgDesc(USBH_HandleTypeDef *phost,                      
                             uint16_t length)

{
  USBH_StatusTypeDef status;
  uint8_t *pData;
#if (USBH_KEEP_CFG_DESCRIPTOR == 1)  
  pData = phost->device.CfgDesc_Raw;
#else
  pData = phost->device.Data;
#endif  
  if((status = USBH_GetDescriptor(phost,
                                  USB_REQ_RECIPIENT_DEVICE | USB_REQ_TYPE_STANDARD,                          
                                  USB_DESC_CONFIGURATION, 
                                  pData,
                                  length)) == USBH_OK)
  {
    
    /* Commands successfully sent and Response Received  */       
    USBH_ParseCfgDesc (&phost->device.CfgDesc,
                       pData,
                       length); 
    
  }
  return status;
}


/**
  * @brief  USBH_Get_StringDesc
  *         Issues string Descriptor command to the device. Once the response 
  *         received, it parses the string descriptor and updates the status.
  * @param  phost: Host Handle
  * @param  string_index: String index for the descriptor
  * @param  buff: Buffer address for the descriptor
  * @param  length: Length of the descriptor
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_Get_StringDesc(USBH_HandleTypeDef *phost,
                                uint8_t string_index, 
                                uint8_t *buff, 
                                uint16_t length)
{
  USBH_StatusTypeDef status;
  if((status = USBH_GetDescriptor(phost,
                                  USB_REQ_RECIPIENT_DEVICE | USB_REQ_TYPE_STANDARD,                                    
                                  USB_DESC_STRING | string_index, 
                                  phost->device.Data,
                                  length)) == USBH_OK)
  {
    /* Commands successfully sent and Response Received  */       
    USBH_ParseStringDesc(phost->device.Data,buff, length);    
  }
  return status;
}

/**
  * @brief  USBH_GetDescriptor
  *         Issues Descriptor command to the device. Once the response received,
  *         it parses the descriptor and updates the status.
  * @param  phost: Host Handle
  * @param  req_type: Descriptor type
  * @param  value_idx: wValue for the GetDescriptr request
  * @param  buff: Buffer to store the descriptor
  * @param  length: Length of the descriptor
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_GetDescriptor(USBH_HandleTypeDef *phost,                          
                               uint8_t  req_type,
                               uint16_t value_idx, 
                               uint8_t* buff, 
                               uint16_t length )
{ 
  if(phost->RequestState == CMD_SEND)
  {
    phost->Control.setup.b.bmRequestType = USB_D2H | req_type;
    phost->Control.setup.b.bRequest = USB_REQ_GET_DESCRIPTOR;
    phost->Control.setup.b.wValue.w = value_idx;
    
    if ((value_idx & 0xff00) == USB_DESC_STRING)
    {
      phost->Control.setup.b.wIndex.w = 0x0409;
    }
    else
    {
      phost->Control.setup.b.wIndex.w = 0;
    }
    phost->Control.setup.b.wLength.w = length; 
  }
  return USBH_CtlReq(phost, buff , length );     
}

/**
  * @brief  USBH_SetAddress
  *         This command sets the address to the connected device
  * @param  phost: Host Handle
  * @param  DeviceAddress: Device address to assign
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_SetAddress(USBH_HandleTypeDef *phost, 
                                   uint8_t DeviceAddress)
{
  if(phost->RequestState == CMD_SEND)
  {
    phost->Control.setup.b.bmRequestType = USB_H2D | USB_REQ_RECIPIENT_DEVICE | \
      USB_REQ_TYPE_STANDARD;
    
    phost->Control.setup.b.bRequest = USB_REQ_SET_ADDRESS;
    
    phost->Control.setup.b.wValue.w = (uint16_t)DeviceAddress;
    phost->Control.setup.b.wIndex.w = 0;
    phost->Control.setup.b.wLength.w = 0;
  }
  return USBH_CtlReq(phost, 0 , 0 );
}

/**
  * @brief  USBH_SetCfg
  *         The command sets the configuration value to the connected device
  * @param  phost: Host Handle
  * @param  cfg_idx: Configuration value
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_SetCfg(USBH_HandleTypeDef *phost, 
                               uint16_t cfg_idx)
{
  if(phost->RequestState == CMD_SEND)
  {
    phost->Control.setup.b.bmRequestType = USB_H2D | USB_REQ_RECIPIENT_DEVICE |\
      USB_REQ_TYPE_STANDARD;
    phost->Control.setup.b.bRequest = USB_REQ_SET_CONFIGURATION;
    phost->Control.setup.b.wValue.w = cfg_idx;
    phost->Control.setup.b.wIndex.w = 0;
    phost->Control.setup.b.wLength.w = 0; 
  }
  
  return USBH_CtlReq(phost, 0 , 0 );      
}

/**
  * @brief  USBH_SetInterface
  *         The command sets the Interface value to the connected device
  * @param  phost: Host Handle
  * @param  altSetting: Interface value
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_SetInterface(USBH_HandleTypeDef *phost, 
                        uint8_t ep_num, uint8_t altSetting)
{
  
  if(phost->RequestState == CMD_SEND)
  {
    phost->Control.setup.b.bmRequestType = USB_H2D | USB_REQ_RECIPIENT_INTERFACE | \
      USB_REQ_TYPE_STANDARD;
    
    phost->Control.setup.b.bRequest = USB_REQ_SET_INTERFACE;
    phost->Control.setup.b.wValue.w = altSetting;
    phost->Control.setup.b.wIndex.w = ep_num;
    phost->Control.setup.b.wLength.w = 0;           
  }
  return USBH_CtlReq(phost, 0 , 0 );     
}

/**
  * @brief  USBH_ClrFeature
  *         This request is used to clear or disable a specific feature.
  * @param  phost: Host Handle
  * @param  ep_num: endpoint number 
  * @param  hc_num: Host channel number 
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_ClrFeature(USBH_HandleTypeDef *phost,
                                   uint8_t ep_num) 
{
  if(phost->RequestState == CMD_SEND)
  {
    phost->Control.setup.b.bmRequestType = USB_H2D | 
      USB_REQ_RECIPIENT_ENDPOINT |
        USB_REQ_TYPE_STANDARD;
    
    phost->Control.setup.b.bRequest = USB_REQ_CLEAR_FEATURE;
    phost->Control.setup.b.wValue.w = FEATURE_SELECTOR_ENDPOINT;
    phost->Control.setup.b.wIndex.w = ep_num;
    phost->Control.setup.b.wLength.w = 0;           
  }
  return USBH_CtlReq(phost, 0 , 0 );   
}

/**
  * @brief  USBH_ParseDevDesc 
  *         This function Parses the device descriptor
  * @param  dev_desc: device_descriptor destinaton address 
  * @param  buf: Buffer where the source descriptor is available
  * @param  length: Length of the descriptor
  * @retval None
  */
static void  USBH_ParseDevDesc (USBH_DevDescTypeDef* dev_desc,
                                uint8_t *buf, 
                                uint16_t length)
{
  dev_desc->bLength            = *(uint8_t  *) (buf +  0);
  dev_desc->bDescriptorType    = *(uint8_t  *) (buf +  1);
  dev_desc->bcdUSB             = LE16 (buf +  2);
  dev_desc->bDeviceClass       = *(uint8_t  *) (buf +  4);
  dev_desc->bDeviceSubClass    = *(uint8_t  *) (buf +  5);
  dev_desc->bDeviceProtocol    = *(uint8_t  *) (buf +  6);
  dev_desc->bMaxPacketSize     = *(uint8_t  *) (buf +  7);
  
  if (length > 8)
  { /* For 1st time after device connection, Host may issue only 8 bytes for 
    Device Descriptor Length  */
    dev_desc->idVendor           = LE16 (buf +  8);
    dev_desc->idProduct          = LE16 (buf + 10);
    dev_desc->bcdDevice          = LE16 (buf + 12);
    dev_desc->iManufacturer      = *(uint8_t  *) (buf + 14);
    dev_desc->iProduct           = *(uint8_t  *) (buf + 15);
    dev_desc->iSerialNumber      = *(uint8_t  *) (buf + 16);
    dev_desc->bNumConfigurations = *(uint8_t  *) (buf + 17);
  }
}

/**
  * @brief  USBH_ParseCfgDesc 
  *         This function Parses the configuration descriptor
  * @param  cfg_desc: Configuration Descriptor address
  * @param  buf: Buffer where the source descriptor is available
  * @param  length: Length of the descriptor
  * @retval None
  */
static void USBH_ParseCfgDesc (USBH_CfgDescTypeDef* cfg_desc,
                               uint8_t *buf, 
                               uint16_t length)
{  
  USBH_InterfaceDescTypeDef    *pif ;
  USBH_EpDescTypeDef           *pep;  
  USBH_DescHeader_t             *pdesc = (USBH_DescHeader_t *)buf;
  uint16_t                      ptr;
  int8_t                        if_ix = 0;
  int8_t                        ep_ix = 0;  
  
  pdesc   = (USBH_DescHeader_t *)buf;
  
  /* Parse configuration descriptor */
  cfg_desc->bLength             = *(uint8_t  *) (buf + 0);
  cfg_desc->bDescriptorType     = *(uint8_t  *) (buf + 1);
  cfg_desc->wTotalLength        = LE16 (buf + 2);
  cfg_desc->bNumInterfaces      = *(uint8_t  *) (buf + 4);
  cfg_desc->bConfigurationValue = *(uint8_t  *) (buf + 5);
  cfg_desc->iConfiguration      = *(uint8_t  *) (buf + 6);
  cfg_desc->bmAttributes        = *(uint8_t  *) (buf + 7);
  cfg_desc->bMaxPower           = *(uint8_t  *) (buf + 8);    
  
  
  if (length > USB_CONFIGURATION_DESC_SIZE)
  {
    ptr = USB_LEN_CFG_DESC;
    pif = (USBH_InterfaceDescTypeDef *)0;
    
    
    while ((if_ix < USBH_MAX_NUM_INTERFACES ) && (ptr < cfg_desc->wTotalLength))
    {
      pdesc = USBH_GetNextDesc((uint8_t *)pdesc, &ptr);
      if (pdesc->bDescriptorType   == USB_DESC_TYPE_INTERFACE) 
      {
        pif = &cfg_desc->Itf_Desc[if_ix];
        USBH_ParseInterfaceDesc (pif, (uint8_t *)pdesc);            
        
        ep_ix = 0;
        pep = (USBH_EpDescTypeDef *)0;        
        while ((ep_ix < pif->bNumEndpoints) && (ptr < cfg_desc->wTotalLength))
        {
          pdesc = USBH_GetNextDesc((void* )pdesc, &ptr);
          if (pdesc->bDescriptorType   == USB_DESC_TYPE_ENDPOINT) 
          {  
            pep = &cfg_desc->Itf_Desc[if_ix].Ep_Desc[ep_ix];
            USBH_ParseEPDesc (pep, (uint8_t *)pdesc);
            ep_ix++;
          }
        }
        if_ix++;
      }
    }
  }  
}



/**
  * @brief  USBH_ParseInterfaceDesc 
  *         This function Parses the interface descriptor
  * @param  if_descriptor : Interface descriptor destination
  * @param  buf: Buffer where the descriptor data is available
  * @retval None
  */
static void  USBH_ParseInterfaceDesc (USBH_InterfaceDescTypeDef *if_descriptor, 
                                      uint8_t *buf)
{
  if_descriptor->bLength            = *(uint8_t  *) (buf + 0);
  if_descriptor->bDescriptorType    = *(uint8_t  *) (buf + 1);
  if_descriptor->bInterfaceNumber   = *(uint8_t  *) (buf + 2);
  if_descriptor->bAlternateSetting  = *(uint8_t  *) (buf + 3);
  if_descriptor->bNumEndpoints      = *(uint8_t  *) (buf + 4);
  if_descriptor->bInterfaceClass    = *(uint8_t  *) (buf + 5);
  if_descriptor->bInterfaceSubClass = *(uint8_t  *) (buf + 6);
  if_descriptor->bInterfaceProtocol = *(uint8_t  *) (buf + 7);
  if_descriptor->iInterface         = *(uint8_t  *) (buf + 8);
}

/**
  * @brief  USBH_ParseEPDesc 
  *         This function Parses the endpoint descriptor
  * @param  ep_descriptor: Endpoint descriptor destination address
  * @param  buf: Buffer where the parsed descriptor stored
  * @retval None
  */
static void  USBH_ParseEPDesc (USBH_EpDescTypeDef  *ep_descriptor, 
                               uint8_t *buf)
{
  
  ep_descriptor->bLength          = *(uint8_t  *) (buf + 0);
  ep_descriptor->bDescriptorType  = *(uint8_t  *) (buf + 1);
  ep_descriptor->bEndpointAddress = *(uint8_t  *) (buf + 2);
  ep_descriptor->bmAttributes     = *(uint8_t  *) (buf + 3);
  ep_descriptor->wMaxPacketSize   = LE16 (buf + 4);
  ep_descriptor->bInterval        = *(uint8_t  *) (buf + 6);
}

/**
  * @brief  USBH_ParseStringDesc 
  *         This function Parses the string descriptor
  * @param  psrc: Source pointer containing the descriptor data
  * @param  pdest: Destination address pointer
  * @param  length: Length of the descriptor
  * @retval None
  */
static void USBH_ParseStringDesc (uint8_t* psrc, 
                                  uint8_t* pdest, 
                                  uint16_t length)
{
  uint16_t strlength;
  uint16_t idx;
  
  /* The UNICODE string descriptor is not NULL-terminated. The string length is
  computed by substracting two from the value of the first byte of the descriptor.
  */
  
  /* Check which is lower size, the Size of string or the length of bytes read 
  from the device */
  
  if ( psrc[1] == USB_DESC_TYPE_STRING)
  { /* Make sure the Descriptor is String Type */
    
    /* psrc[0] contains Size of Descriptor, subtract 2 to get the length of string */      
    strlength = ( ( (psrc[0]-2) <= length) ? (psrc[0]-2) :length); 
    psrc += 2; /* Adjust the offset ignoring the String Len and Descriptor type */
    
    for (idx = 0; idx < strlength; idx+=2 )
    {/* Copy Only the string and ignore the UNICODE ID, hence add the src */
      *pdest =  psrc[idx];
      pdest++;
    }  
    *pdest = 0; /* mark end of string */  
  }
}

/**
  * @brief  USBH_GetNextDesc 
  *         This function return the next descriptor header
  * @param  buf: Buffer where the cfg descriptor is available
  * @param  ptr: data popinter inside the cfg descriptor
  * @retval next header
  */
USBH_DescHeader_t  *USBH_GetNextDesc (uint8_t   *pbuf, uint16_t  *ptr)
{
  USBH_DescHeader_t  *pnext;
 
  *ptr += ((USBH_DescHeader_t *)pbuf)->bLength;  
  pnext = (USBH_DescHeader_t *)((uint8_t *)pbuf + \
         ((USBH_DescHeader_t *)pbuf)->bLength);
 
  return(pnext);
}


/**
  * @brief  USBH_CtlReq
  *         USBH_CtlReq sends a control request and provide the status after 
  *            completion of the request
  * @param  phost: Host Handle
  * @param  req: Setup Request Structure
  * @param  buff: data buffer address to store the response
  * @param  length: length of the response
  * @retval USBH Status
  */
USBH_StatusTypeDef USBH_CtlReq     (USBH_HandleTypeDef *phost, 
                             uint8_t             *buff,
                             uint16_t            length)
{
  USBH_StatusTypeDef status;
  status = USBH_BUSY;
  
  switch (phost->RequestState)
  {
  case CMD_SEND:
    /* Start a SETUP transfer */
    phost->Control.buff = buff; 
    phost->Control.length = length;
    phost->Control.state = CTRL_SETUP;  
    phost->RequestState = CMD_WAIT;
    status = USBH_BUSY;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    break;
    
  case CMD_WAIT:
    status = USBH_HandleControl(phost);
     if (status == USBH_OK) 
    {
      /* Commands successfully sent and Response Received  */       
      phost->RequestState = CMD_SEND;
      phost->Control.state =CTRL_IDLE;  
      status = USBH_OK;      
    }
    else if  (status == USBH_FAIL)
    {
      /* Failure Mode */
      phost->RequestState = CMD_SEND;
      status = USBH_FAIL;
    }   
    break;
    
  default:
    break; 
  }
  return status;
}

/**
  * @brief  USBH_HandleControl
  *         Handles the USB control transfer state machine
  * @param  phost: Host Handle
  * @retval USBH Status
  */
static USBH_StatusTypeDef USBH_HandleControl (USBH_HandleTypeDef *phost)
{
  uint8_t direction;  
  USBH_StatusTypeDef status = USBH_BUSY;
  USBH_URBStateTypeDef URB_Status = USBH_URB_IDLE;
  
  switch (phost->Control.state)
  {
  case CTRL_SETUP:
    /* send a SETUP packet */
    USBH_CtlSendSetup     (phost, 
	                   (uint8_t *)phost->Control.setup.d8 , 
	                   phost->Control.pipe_out); 
    
    phost->Control.state = CTRL_SETUP_WAIT; 
    break; 
    
  case CTRL_SETUP_WAIT:
    
    URB_Status = USBH_LL_GetURBState(phost, phost->Control.pipe_out); 
    /* case SETUP packet sent successfully */
    if(URB_Status == USBH_URB_DONE)
    { 
      direction = (phost->Control.setup.b.bmRequestType & USB_REQ_DIR_MASK);
      
      /* check if there is a data stage */
      if (phost->Control.setup.b.wLength.w != 0 )
      {        
        if (direction == USB_D2H)
        {
          /* Data Direction is IN */
          phost->Control.state = CTRL_DATA_IN;
        }
        else
        {
          /* Data Direction is OUT */
          phost->Control.state = CTRL_DATA_OUT;
        } 
      }
      /* No DATA stage */
      else
      {
        /* If there is No Data Transfer Stage */
        if (direction == USB_D2H)
        {
          /* Data Direction is IN */
          phost->Control.state = CTRL_STATUS_OUT;
        }
        else
        {
          /* Data Direction is OUT */
          phost->Control.state = CTRL_STATUS_IN;
        } 
      }          
#if (USBH_USE_OS == 1)
      osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif
    }
    else if(URB_Status == USBH_URB_ERROR)
    {
      phost->Control.state = CTRL_ERROR;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }    
    break;
    
  case CTRL_DATA_IN:  
    /* Issue an IN token */ 
     phost->Control.timer = phost->Timer;
    USBH_CtlReceiveData(phost,
                        phost->Control.buff, 
                        phost->Control.length,
                        phost->Control.pipe_in);
 
    phost->Control.state = CTRL_DATA_IN_WAIT;
    break;    
    
  case CTRL_DATA_IN_WAIT:
    
    URB_Status = USBH_LL_GetURBState(phost , phost->Control.pipe_in); 
    
    /* check is DATA packet transfered successfully */
    if  (URB_Status == USBH_URB_DONE)
    { 
      phost->Control.state = CTRL_STATUS_OUT;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
   
    /* manage error cases*/
    if  (URB_Status == USBH_URB_STALL) 
    { 
      /* In stall case, return to previous machine state*/
      status = USBH_NOT_SUPPORTED;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }   
    else if (URB_Status == USBH_URB_ERROR)
    {
      /* Device error */
      phost->Control.state = CTRL_ERROR;  
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    break;
    
  case CTRL_DATA_OUT:
    
    USBH_CtlSendData (phost,
                      phost->Control.buff, 
                      phost->Control.length , 
                      phost->Control.pipe_out,
                      1);
     phost->Control.timer = phost->Timer;
    phost->Control.state = CTRL_DATA_OUT_WAIT;
    break;
    
  case CTRL_DATA_OUT_WAIT:
    
    URB_Status = USBH_LL_GetURBState(phost , phost->Control.pipe_out);     
    
    if  (URB_Status == USBH_URB_DONE)
    { /* If the Setup Pkt is sent successful, then change the state */
      phost->Control.state = CTRL_STATUS_IN;
#if (USBH_USE_OS == 1)
      osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    
    /* handle error cases */
    else if  (URB_Status == USBH_URB_STALL) 
    { 
      /* In stall case, return to previous machine state*/
      phost->Control.state = CTRL_STALLED; 
      status = USBH_NOT_SUPPORTED;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    } 
    else if  (URB_Status == USBH_URB_NOTREADY)
    { 
      /* Nack received from device */
      phost->Control.state = CTRL_DATA_OUT;
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }    
    else if (URB_Status == USBH_URB_ERROR)
    {
      /* device error */
      phost->Control.state = CTRL_ERROR;  
      status = USBH_FAIL;    
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    } 
    break;
    
    
  case CTRL_STATUS_IN:
    /* Send 0 bytes out packet */
    USBH_CtlReceiveData (phost,
                         0,
                         0,
                         phost->Control.pipe_in);
    phost->Control.timer = phost->Timer;
    phost->Control.state = CTRL_STATUS_IN_WAIT;
    
    break;
    
  case CTRL_STATUS_IN_WAIT:
    
    URB_Status = USBH_LL_GetURBState(phost , phost->Control.pipe_in); 
    
    if  ( URB_Status == USBH_URB_DONE)
    { /* Control transfers completed, Exit the State Machine */
      phost->Control.state = CTRL_COMPLETE;
      status = USBH_OK;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    
    else if (URB_Status == USBH_URB_ERROR)
    {
      phost->Control.state = CTRL_ERROR;
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
     else if(URB_Status == USBH_URB_STALL)
    {
      /* Control transfers completed, Exit the State Machine */
      status = USBH_NOT_SUPPORTED;
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    break;
    
  case CTRL_STATUS_OUT:
    USBH_CtlSendData (phost,
                      0,
                      0,
                      phost->Control.pipe_out,
                      1);
     phost->Control.timer = phost->Timer;
    phost->Control.state = CTRL_STATUS_OUT_WAIT;
    break;
    
  case CTRL_STATUS_OUT_WAIT: 
    
    URB_Status = USBH_LL_GetURBState(phost , phost->Control.pipe_out);  
    if  (URB_Status == USBH_URB_DONE)
    { 
      status = USBH_OK;      
      phost->Control.state = CTRL_COMPLETE; 
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    else if  (URB_Status == USBH_URB_NOTREADY)
    { 
      phost->Control.state = CTRL_STATUS_OUT;
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }      
    else if (URB_Status == USBH_URB_ERROR)
    {
      phost->Control.state = CTRL_ERROR; 
      
#if (USBH_USE_OS == 1)
    osMessagePut ( phost->os_event, USBH_CONTROL_EVENT, 0);
#endif      
    }
    break;
    
  case CTRL_ERROR:
    /* 
    After a halt condition is encountered or an error is detected by the 
    host, a control endpoint is allowed to recover by accepting the next Setup 
    PID; i.e., recovery actions via some other pipe are not required for control
    endpoints. For the Default Control Pipe, a device reset will ultimately be 
    required to clear the halt or error condition if the next Setup PID is not 
    accepted.
    */
    if (++ phost->Control.errorcount <= USBH_MAX_ERROR_COUNT)
    {
      /* try to recover control */
      USBH_LL_Stop(phost);
         
      /* Do the transmission again, starting from SETUP Packet */
      phost->Control.state = CTRL_SETUP; 
      phost->RequestState = CMD_SEND;
    }
    else
    {
      phost->Control.errorcount = 0;
      USBH_ErrLog("Control error");
      status = USBH_FAIL;
      
    }
    break;
    
  default:
    break;
  }
  return status;
}

/**
* @}
*/ 

/**
* @}
*/ 

/**
* @}
*/

/**
* @}
*/ 

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