usbd_msc_bot.c

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/* Includes ------------------------------------------------------------------*/
#include "usbd_msc_bot.h"
#include "usbd_msc.h"
#include "usbd_msc_scsi.h"
#include "usbd_ioreq.h"

static void MSC_BOT_CBW_Decode (USBD_HandleTypeDef  *pdev);

static void MSC_BOT_SendData (USBD_HandleTypeDef  *pdev, 
                              uint8_t* pbuf, 
                              uint16_t len);

static void MSC_BOT_Abort(USBD_HandleTypeDef  *pdev);
void MSC_BOT_Init (USBD_HandleTypeDef  *pdev)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;
    
  hmsc->bot_state  = USBD_BOT_IDLE;
  hmsc->bot_status = USBD_BOT_STATUS_NORMAL;
  
  hmsc->scsi_sense_tail = 0;
  hmsc->scsi_sense_head = 0;
  
  ((USBD_StorageTypeDef *)pdev->pUserData)->Init(0);
  
  USBD_LL_FlushEP(pdev, MSC_EPOUT_ADDR);
  USBD_LL_FlushEP(pdev, MSC_EPIN_ADDR);
  
  /* Prapare EP to Receive First BOT Cmd */
  USBD_LL_PrepareReceive (pdev,
                          MSC_EPOUT_ADDR,
                          (uint8_t *)&hmsc->cbw,
                          USBD_BOT_CBW_LENGTH);    
}

void MSC_BOT_Reset (USBD_HandleTypeDef  *pdev)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;
    
  hmsc->bot_state  = USBD_BOT_IDLE;
  hmsc->bot_status = USBD_BOT_STATUS_RECOVERY;  
  
  /* Prapare EP to Receive First BOT Cmd */
  USBD_LL_PrepareReceive (pdev,
                          MSC_EPOUT_ADDR,
                          (uint8_t *)&hmsc->cbw,
                          USBD_BOT_CBW_LENGTH);   
}

void MSC_BOT_DeInit (USBD_HandleTypeDef  *pdev)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;  
  hmsc->bot_state  = USBD_BOT_IDLE;
}

void MSC_BOT_DataIn (USBD_HandleTypeDef  *pdev, 
                     uint8_t epnum)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;  
  
  switch (hmsc->bot_state)
  {
  case USBD_BOT_DATA_IN:
    if(SCSI_ProcessCmd(pdev,
                        hmsc->cbw.bLUN,
                        &hmsc->cbw.CB[0]) < 0)
    {
      MSC_BOT_SendCSW (pdev, USBD_CSW_CMD_FAILED);
    }
    break;
    
  case USBD_BOT_SEND_DATA:
  case USBD_BOT_LAST_DATA_IN:
    MSC_BOT_SendCSW (pdev, USBD_CSW_CMD_PASSED);
    
    break;
    
  default:
    break;
  }
}
void MSC_BOT_DataOut (USBD_HandleTypeDef  *pdev, 
                      uint8_t epnum)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;
  
  switch (hmsc->bot_state)
  {
  case USBD_BOT_IDLE:
    MSC_BOT_CBW_Decode(pdev);
    break;
    
  case USBD_BOT_DATA_OUT:
    
    if(SCSI_ProcessCmd(pdev,
                        hmsc->cbw.bLUN,
                        &hmsc->cbw.CB[0]) < 0)
    {
      MSC_BOT_SendCSW (pdev, USBD_CSW_CMD_FAILED);
    }

    break;
    
  default:
    break;
  }
}

static void  MSC_BOT_CBW_Decode (USBD_HandleTypeDef  *pdev)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData;  
  
  hmsc->csw.dTag = hmsc->cbw.dTag;
  hmsc->csw.dDataResidue = hmsc->cbw.dDataLength;
  
  if ((USBD_LL_GetRxDataSize (pdev ,MSC_EPOUT_ADDR) != USBD_BOT_CBW_LENGTH) ||
      (hmsc->cbw.dSignature != USBD_BOT_CBW_SIGNATURE)||
        (hmsc->cbw.bLUN > 1) || 
          (hmsc->cbw.bCBLength < 1) || 
            (hmsc->cbw.bCBLength > 16))
  {
    
    SCSI_SenseCode(pdev,
                   hmsc->cbw.bLUN, 
                   ILLEGAL_REQUEST, 
                   INVALID_CDB);
    
    hmsc->bot_status = USBD_BOT_STATUS_ERROR;   
    MSC_BOT_Abort(pdev);
 
  }
  else
  {
    if(SCSI_ProcessCmd(pdev,
                       hmsc->cbw.bLUN,
                       &hmsc->cbw.CB[0]) < 0)
    {
      if(hmsc->bot_state == USBD_BOT_NO_DATA)
      {
       MSC_BOT_SendCSW (pdev,
                         USBD_CSW_CMD_FAILED); 
      }
      else
      {
        MSC_BOT_Abort(pdev);
      }
    }
    /*Burst xfer handled internally*/
    else if ((hmsc->bot_state != USBD_BOT_DATA_IN) && 
             (hmsc->bot_state != USBD_BOT_DATA_OUT) &&
             (hmsc->bot_state != USBD_BOT_LAST_DATA_IN)) 
    {
      if (hmsc->bot_data_length > 0)
      {
        MSC_BOT_SendData(pdev,
                         hmsc->bot_data, 
                         hmsc->bot_data_length);
      }
      else if (hmsc->bot_data_length == 0) 
      {
        MSC_BOT_SendCSW (pdev,
                         USBD_CSW_CMD_PASSED);
      }
    }
  }
}

static void  MSC_BOT_SendData(USBD_HandleTypeDef  *pdev,
                              uint8_t* buf, 
                              uint16_t len)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData; 
  
  len = MIN (hmsc->cbw.dDataLength, len);
  hmsc->csw.dDataResidue -= len;
  hmsc->csw.bStatus = USBD_CSW_CMD_PASSED;
  hmsc->bot_state = USBD_BOT_SEND_DATA;
  
  USBD_LL_Transmit (pdev, MSC_EPIN_ADDR, buf, len);  
}

void  MSC_BOT_SendCSW (USBD_HandleTypeDef  *pdev,
                              uint8_t CSW_Status)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData; 
  
  hmsc->csw.dSignature = USBD_BOT_CSW_SIGNATURE;
  hmsc->csw.bStatus = CSW_Status;
  hmsc->bot_state = USBD_BOT_IDLE;
  
  USBD_LL_Transmit (pdev, 
             MSC_EPIN_ADDR, 
             (uint8_t *)&hmsc->csw, 
             USBD_BOT_CSW_LENGTH);
  
  /* Prepare EP to Receive next Cmd */
  USBD_LL_PrepareReceive (pdev,
                    MSC_EPOUT_ADDR,
                    (uint8_t *)&hmsc->cbw, 
                    USBD_BOT_CBW_LENGTH);  
  
}

static void  MSC_BOT_Abort (USBD_HandleTypeDef  *pdev)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData; 
  
  if ((hmsc->cbw.bmFlags == 0) && 
      (hmsc->cbw.dDataLength != 0) &&
      (hmsc->bot_status == USBD_BOT_STATUS_NORMAL) )
  {
    USBD_LL_StallEP(pdev, MSC_EPOUT_ADDR );
  }
  USBD_LL_StallEP(pdev, MSC_EPIN_ADDR);
  
  if(hmsc->bot_status == USBD_BOT_STATUS_ERROR)
  {
    USBD_LL_PrepareReceive (pdev,
                      MSC_EPOUT_ADDR,
                      (uint8_t *)&hmsc->cbw, 
                      USBD_BOT_CBW_LENGTH);    
  }
}

void  MSC_BOT_CplClrFeature (USBD_HandleTypeDef  *pdev, uint8_t epnum)
{
  USBD_MSC_BOT_HandleTypeDef  *hmsc = (USBD_MSC_BOT_HandleTypeDef*)pdev->pClassData; 
  
  if(hmsc->bot_status == USBD_BOT_STATUS_ERROR )/* Bad CBW Signature */
  {
    USBD_LL_StallEP(pdev, MSC_EPIN_ADDR);
    hmsc->bot_status = USBD_BOT_STATUS_NORMAL;    
  }
  else if(((epnum & 0x80) == 0x80) && ( hmsc->bot_status != USBD_BOT_STATUS_RECOVERY))
  {
    MSC_BOT_SendCSW (pdev, USBD_CSW_CMD_FAILED);
  }
  
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/