void host_mass_storage_task(void)
#endif
{
  uint8_t i;
  uint8_t max_lun;
  uint32_t capacity;
  extern volatile uint8_t device_state;
  uint32_t total_capacity;
  uint8_t status = CTRL_GOOD;

#ifdef FREERTOS_USED
  portTickType xLastWakeTime;

  xLastWakeTime = xTaskGetTickCount();
  while (true)
  {
    vTaskDelayUntil(&xLastWakeTime, configTSK_USB_HMS_PERIOD);

#endif  // FREERTOS_USED
    // First, check the host controller is in full operating mode with the
    // B-device attached and enumerated
    if (Is_host_ready())
    {
      // New device connection (executed only once after device connection)
      if (ms_new_device_connected)
      {
        // For all supported interfaces
        for (i = 0; i < Get_nb_supported_interface(); i++)
        {
          // If mass-storage class
          if (Get_class(i) == MS_CLASS)
          {
            total_capacity = 0;

            // Get correct physical pipes associated with IN/OUT endpoints
            if (Is_ep_in(i, 0))
            { // Yes, associate it with the IN pipe
              g_pipe_ms_in = Get_ep_pipe(i, 0);
              g_pipe_ms_out = Get_ep_pipe(i, 1);
            }
            else
            { // No, invert...
              g_pipe_ms_in = Get_ep_pipe(i, 1);
              g_pipe_ms_out = Get_ep_pipe(i, 0);
            }

            ms_new_device_connected = false;
            ms_connected = true;

            // Get the number of LUNs in the connected mass-storage device
            max_lun = host_get_lun();

            // Initialize all USB drives
            for (host_selected_lun = 0; host_selected_lun < max_lun; host_selected_lun++)
            {
              uint32_t retry;
              if ((status = host_ms_inquiry()) != CTRL_GOOD)
                break;
              if ((status = host_ms_request_sense()) != CTRL_GOOD)
                break;
              for (retry = 0; retry < 3; retry++)
              {
                if ((status = host_test_unit_ready(host_selected_lun)) == CTRL_GOOD)
                {
                  if ((status = host_read_capacity(host_selected_lun, &capacity)) == CTRL_GOOD)
                    total_capacity += capacity;
                  break;
                }
              }
            }
            // If busy then restart
            if (status == CTRL_BUSY || status == CTRL_NO_PRESENT)
            {
              ms_connected = false;
              ms_new_device_connected = true;
              return;
            }
            // If failed then report device not supported
            if (status == CTRL_FAIL)
            {
              device_state = DEVICE_ERROR;
              Host_device_class_not_supported_action();
              ms_connected = false;
              return;
            }

#ifdef AI_MAXIMAL_CAPACITY_SUPPORTED_MB
            if (total_capacity > (AI_MAXIMAL_CAPACITY_SUPPORTED_MB*2*1024))
            {
              device_state = DEVICE_ERROR;
              Host_device_class_not_supported_action();
              ms_connected = false;
              return;
            }
#endif

            LOG_STR(log_ms_dev_connected);

            // Notify the Audio Interface of the new connection
            ai_usb_ms_new_connection();
            break;
          }
        }
      }
    }
#ifdef FREERTOS_USED
  }
#endif
}
示例#2
0
void usb_host_task(void)
#endif
{
  #define DEVICE_DEFAULT_MAX_ERROR_COUNT  2
  static uint8_t device_default_error_count;

#ifdef HOST_VBUS_LOW_TIMEOUT
  extern t_cpu_time timer_vbus_low;
#endif
  static bool sav_int_sof_enable;
  uint8_t pipe;

#ifdef FREERTOS_USED
  portTickType xLastWakeTime;

  xLastWakeTime = xTaskGetTickCount();
  while (true)
  {
    vTaskDelayUntil(&xLastWakeTime, configTSK_USB_HST_PERIOD);

#endif  // FREERTOS_USED
    switch (device_state)
    {
#ifdef HOST_VBUS_LOW_TIMEOUT
    case DEVICE_VBUS_LOW:
      Usb_disable_vbus();
      if (cpu_is_timeout(&timer_vbus_low))
        usb_host_task_init();
      break;
#endif

    //------------------------------------------------------
    //   DEVICE_UNATTACHED state
    //
    //   - Default init state
    //   - Try to give device power supply
    //
    case DEVICE_UNATTACHED:
      device_default_error_count = 0;
      nb_interface_supported = 0;
      Host_clear_device_status();     // Reset device status
      Usb_clear_all_event();          // Clear all software events
      Host_disable_sof();
      host_disable_all_pipes();
      Usb_enable_vbus();              // Give at least device power supply!
      // If VBus OK, wait for device connection
      if (Is_usb_vbus_high())
        device_state = DEVICE_ATTACHED;
      break;

    //------------------------------------------------------
    //   DEVICE_ATTACHED state
    //
    //   - VBus is on
    //   - Try to detect device connection
    //
    case DEVICE_ATTACHED:
      if (Is_host_device_connection() || Is_usb_event(EVT_HOST_CONNECTION) )  // Device pull-up detected
      {
device_attached_retry:
        if( Is_usb_event(EVT_HOST_CONNECTION) ) {
          Usb_ack_event(EVT_HOST_CONNECTION);
        }
        Usb_ack_bconnection_error_interrupt();
        Usb_ack_vbus_error_interrupt();
        Host_ack_device_connection();

        Host_clear_device_status();   // Reset device status
        cpu_irq_disable();
        Host_disable_device_disconnection_interrupt();
        Host_send_reset();            // First USB reset
        (void)Is_host_sending_reset();
        cpu_irq_enable();
        Usb_ack_event(EVT_HOST_SOF);
        // Active wait for end of reset send
        while (Is_host_sending_reset())
        {
          // The USB macro does not signal the end of reset when a disconnection occurs
          if (Is_host_device_disconnection())
          {
            // Stop sending USB reset
            Host_stop_sending_reset();
          }
        }
        Host_ack_reset_sent();
        Host_enable_sof();            // Start SOF generation
        Host_enable_sof_interrupt();  // SOF will be detected under interrupt
        if (!Is_host_device_disconnection())
        {
          // Workaround for some buggy devices with powerless pull-up
          // usually low-speed where data line rises slowly and can be interpreted as disconnection
          for (sof_cnt = 0; sof_cnt < 0xFFFF; sof_cnt++)  // Basic time-out counter
          {
            // If we detect SOF, device is still alive and connected, just clear false disconnect flag
            if (Is_usb_event(EVT_HOST_SOF) && Is_host_device_disconnection())
            {
              Host_ack_device_connection();
              Host_ack_device_disconnection();
              break;
            }
          }
        }
        Host_enable_device_disconnection_interrupt();
        sof_cnt = 0;
        while (sof_cnt < 100)         // Wait 100 ms after USB reset
        {
          if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++; // Count SOFs
          if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) goto device_attached_error;
        }
        device_state = DEVICE_POWERED;
        LOG_STR(log_device_connected);
        Host_device_connection_action();
        sof_cnt = 0;
      }
device_attached_error:
      // Device connection error, or VBus pb -> Retry the connection process from the beginning
      if (Is_usb_bconnection_error_interrupt() || Is_usb_vbus_error_interrupt() || Is_usb_vbus_low())
      {
        if (device_state != DEVICE_VBUS_LOW)
          device_state = DEVICE_UNATTACHED;
        Usb_ack_bconnection_error_interrupt();
        Usb_ack_vbus_error_interrupt();
        Host_disable_sof();
      }
      break;

    //------------------------------------------------------
    //   DEVICE_POWERED state
    //
    //   - Device connection (attach) has been detected,
    //   - Wait 100 ms and configure default control pipe
    //
    case DEVICE_POWERED:
      if (Is_usb_event(EVT_HOST_SOF))
      {
        Usb_ack_event(EVT_HOST_SOF);
        if (sof_cnt++ >= 100)         // Wait 100 ms
        {
          Host_enable_pipe(P_CONTROL);
          (void)Host_configure_pipe(P_CONTROL,
                                    0,
                                    EP_CONTROL,
                                    TYPE_CONTROL,
                                    TOKEN_SETUP,
                                    8,
                                    SINGLE_BANK);
          device_state = DEVICE_DEFAULT;
        }
      }
      break;

    //------------------------------------------------------
    //   DEVICE_DEFAULT state
    //
    //   - Get device descriptor
    //   - Reconfigure control pipe according to device control endpoint
    //   - Assign device address
    //
    case DEVICE_DEFAULT:
      // Get first device descriptor
      if (host_get_device_descriptor_incomplete() == CONTROL_GOOD)
      {
        sof_cnt = 0;
        while (sof_cnt < 20)          // Wait 20 ms before USB reset (special buggy devices...)
        {
          if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++;
          if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) break;
        }
        cpu_irq_disable();
        Host_disable_device_disconnection_interrupt();
        Host_send_reset();            // First USB reset
        (void)Is_host_sending_reset();
        cpu_irq_enable();
        Usb_ack_event(EVT_HOST_SOF);
        // Active wait for end of reset send
        while (Is_host_sending_reset())
        {
          // The USB macro does not signal the end of reset when a disconnection occurs
          if (Is_host_device_disconnection())
          {
            // Stop sending USB reset
            Host_stop_sending_reset();
          }
        }
        Host_ack_reset_sent();
        if (!Is_host_device_disconnection())
        {
          // Workaround for some buggy devices with powerless pull-up
          // usually low-speed where data line rises slowly and can be interpreted as disconnection
          for (sof_cnt = 0; sof_cnt < 0xFFFF; sof_cnt++)  // Basic time-out counter
          {
            // If we detect SOF, device is still alive and connected, just clear false disconnect flag
            if (Is_usb_event(EVT_HOST_SOF) && Is_host_device_disconnection())
            {
              Host_ack_device_connection();
              Host_ack_device_disconnection();
              break;
            }
          }
        }
        Host_enable_device_disconnection_interrupt();
        sof_cnt = 0;
        while (sof_cnt < 200)         // Wait 200 ms after USB reset
        {
          if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++;
          if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) break;
        }
        Host_disable_pipe(P_CONTROL);
        Host_unallocate_memory(P_CONTROL);
        Host_enable_pipe(P_CONTROL);
        // Reconfigure the control pipe according to the device control endpoint
        (void)Host_configure_pipe(P_CONTROL,
                                  0,
                                  EP_CONTROL,
                                  TYPE_CONTROL,
                                  TOKEN_SETUP,
                                  data_stage[OFFSET_FIELD_MAXPACKETSIZE],
                                  SINGLE_BANK);
        // Give an absolute device address
        if (host_set_address(DEVICE_ADDRESS) == CONTROL_GOOD)
        {
          for (pipe = 0; pipe < MAX_PEP_NB; pipe++)
            Host_configure_address(pipe, DEVICE_ADDRESS);
          device_state = DEVICE_ADDRESSED;
        }
        else if (device_state != DEVICE_VBUS_LOW)
          device_state = DEVICE_ERROR;
      }
      else
      {
        if (device_state != DEVICE_VBUS_LOW)
        {
          if (++device_default_error_count > DEVICE_DEFAULT_MAX_ERROR_COUNT)
          device_state = DEVICE_ERROR;
          else
          {
            Host_disable_sof();
            Host_disable_pipe(P_CONTROL);
            Host_unallocate_memory(P_CONTROL);
            device_state = DEVICE_ATTACHED;
            goto device_attached_retry;
          }
        }
        Usb_ack_bconnection_error_interrupt();
        Usb_ack_vbus_error_interrupt();
        Host_disable_sof();
      }
      break;

    //------------------------------------------------------
    //   DEVICE_ADDRESSED state
    //
    //   - Check if VID PID is in supported list
    //
    case DEVICE_ADDRESSED:
      if (host_get_device_descriptor() == CONTROL_GOOD)
      {
        // Detect if the device connected belongs to the supported devices table
        if (host_check_VID_PID())
        {
          Host_set_device_supported();
          Host_device_supported_action();
          device_state = DEVICE_CONFIGURED;
        }
        else
        {
#if HOST_STRICT_VID_PID_TABLE == ENABLE
          device_state = DEVICE_ERROR;
          LOG_STR(log_unsupported_device);
#else
          device_state = DEVICE_CONFIGURED;
#endif
          Host_device_not_supported_action();
        }
      }
      else if (device_state != DEVICE_VBUS_LOW)
        device_state = DEVICE_ERROR; // Can not get device descriptor
      break;

    //------------------------------------------------------
    //   DEVICE_CONFIGURED state
    //
    //   - Configure pipes for the supported interface
    //   - Send Set_configuration() request
    //   - Go to full operating mode (device ready)
    //
    case DEVICE_CONFIGURED:
      {
        uint8_t configuration_index = 0;

        if (host_get_configuration_descriptor(configuration_index) == CONTROL_GOOD)
        {
          if (host_check_class())       // Class support OK?
          {
#if HOST_AUTO_CFG_ENDPOINT == DISABLE
            User_configure_endpoint();  // User call here instead of autoconfig
            Host_set_configured();      // Assumes config is OK with user config
#endif
            if (Is_host_configured())
            {
              if (host_set_configuration(data_stage[OFFSET_FIELD_CONFIGURATION_NB]) == CONTROL_GOOD)  // Send Set_configuration
              {
                // Device and host are now fully configured
                // go to DEVICE_READY normal operation
                device_state = DEVICE_READY;
                // Monitor device disconnection under interrupt
                Host_enable_device_disconnection_interrupt();
                // If user host application requires SOF interrupt event
                // Keep SOF interrupt enabled, otherwise disable this interrupt
#if HOST_CONTINUOUS_SOF_INTERRUPT == DISABLE
                cpu_irq_disable();
                Host_disable_sof_interrupt();
                (void)Is_host_sof_interrupt_enabled();
                cpu_irq_enable();
#endif
                Host_new_device_connection_action();
                cpu_irq_enable();
                LOG_STR(log_device_enumerated);
              }
              else if (device_state != DEVICE_VBUS_LOW)
                device_state = DEVICE_ERROR; // Problem during Set_configuration request...
            }
          }
          else  // Device class not supported...
          {
            device_state = DEVICE_UNSUPPORTED;
            LOG_STR(log_unsupported_device);
            Host_device_class_not_supported_action();
          }
        }
        else if (device_state != DEVICE_VBUS_LOW)
          device_state = DEVICE_ERROR; // Can not get configuration descriptors...
      }
      break;

    //------------------------------------------------------
    //   DEVICE_READY state
    //
    //   - Full standard operating mode
    //   - Nothing to do...
    //
    case DEVICE_READY:                // Host full standard operating mode!
      break;

    //------------------------------------------------------
    //   DEVICE_UNSUPPORTED state
    //
    case DEVICE_UNSUPPORTED:
      break;

    //------------------------------------------------------
    //   DEVICE_ERROR state
    //
    //   - Error state
    //   - Do custom action call (probably go to default mode...)
    //
    case DEVICE_ERROR:                //! @todo
#if HOST_ERROR_RESTART == ENABLE
      device_state = DEVICE_UNATTACHED;
#endif
      Host_device_error_action();
      break;

    //------------------------------------------------------
    //   DEVICE_SUSPENDED state
    //
    //   - Host application request to suspend the device activity
    //   - State machine comes here thanks to Host_request_suspend()
    //
    case DEVICE_SUSPENDED:
      if (Is_device_supports_remote_wakeup()) // If the connected device supports remote wake-up
      {
        host_set_feature_remote_wakeup(); // Enable this feature...
      }
      LOG_STR(log_usb_suspended);
      sav_int_sof_enable = Is_host_sof_interrupt_enabled(); //Save current SOF interrupt enable state
      cpu_irq_disable();
      Host_disable_sof_interrupt();
      (void)Is_host_sof_interrupt_enabled();
      cpu_irq_enable();
      Host_ack_sof();
      Host_disable_sof();             // Stop SOF generation, this generates the suspend state
      Host_ack_hwup();
      Host_enable_hwup_interrupt();   // Enable host wake-up interrupt
                                      // (this is the unique USB interrupt able to wake up the CPU core from power-down mode)
      (void)Is_host_hwup_interrupt_enabled(); // Make sure host wake-up interrupt is enabled
      Usb_freeze_clock();
      //! @todo Implement this on the silicon version
      //Stop_pll();
      Host_suspend_action();          // Custom action here! (e.g. go to power-save mode...)
      device_state = DEVICE_WAIT_RESUME;  // Wait for device resume event
      break;

    //------------------------------------------------------
    //   DEVICE_WAIT_RESUME state
    //
    //   Wait in this state till:
    //   - the host receives an upstream resume from the device
    //   - or the host software request the device to resume
    //
    case DEVICE_WAIT_RESUME:
      if (Is_usb_event(EVT_HOST_HWUP) || Is_host_request_resume())  // Remote wake-up has been detected
                                                                    // or local resume request has been received
      {
        if (Is_host_request_resume())     // Not a remote wake-up, but a host application request
        {
          // CAUTION: HWUP can be cleared only when USB clock is active
          //! @todo Implement this on the silicon version
          //Pll_start_auto();               // First Restart the PLL for USB operation
          //Wait_pll_ready();               // Make sure PLL is locked
          Usb_unfreeze_clock();           // Enable clock on USB interface
          (void)Is_usb_clock_frozen();    // Make sure USB interface clock is enabled
          cpu_irq_disable();
          Host_disable_hwup_interrupt();  // Wake-up interrupt should be disabled as host is now awoken!
          (void)Is_host_hwup_interrupt_enabled();
          cpu_irq_enable();
          Host_ack_hwup();                // Clear HWUP interrupt flag
        }
        Host_enable_sof();
        Host_send_resume();               // Send downstream resume
        while (!Is_host_down_stream_resume());  // Wait for downstream resume sent
        Host_ack_remote_wakeup();         // Ack remote wake-up reception
        Host_ack_request_resume();        // Ack software request
        Host_ack_down_stream_resume();    // Ack downstream resume sent
        Usb_ack_event(EVT_HOST_HWUP);     // Ack software event
        if (sav_int_sof_enable) Host_enable_sof_interrupt();  // Restore SOF interrupt enable state before suspend
        device_state = DEVICE_READY;      // Come back to full operating mode
        LOG_STR(log_usb_resumed);
      }
      break;

    //------------------------------------------------------
    //   default state
    //
    //   - Default case: ERROR
    //   - Go to DEVICE_UNATTACHED state
    //
    default:
      device_state = DEVICE_UNATTACHED;
      break;
    }
#ifdef FREERTOS_USED
  }
#endif
}
示例#3
0
/**
 * @brief Entry point of the USB host management
 *
 * The aim is to manage the device target connection and enumeration
 * depending on the device_state, the function performs the required operations
 * to get the device enumerated and configured
 * Once the device is operationnal, the device_state value is DEVICE_READY
 * This state should be tested by the host task application before performing
 * any applicative requests to the device.
 *
 * @param none
 *
 * @return none
 *
 * \image html host_task.gif
 */
void usb_host_task(void)
{

   switch (device_state)
   {
     //------------------------------------------------------
     //   DEVICE_UNATTACHED state
     //
     //   - Default init state
     //   - Try to give device power supply
     //
      case DEVICE_UNATTACHED:
         Host_clear_device_supported();        // Reset Device status
         Host_clear_configured();
         Host_clear_device_ready();
         Usb_clear_all_event();                // Clear all software events
         new_device_connected=FALSE;
         selected_device=0;
         
#if (USB_HUB_SUPPORT==ENABLE)
         nb_hub_present = 0;
#endif         
         
#if (SOFTWARE_VBUS_CTRL==ENABLE)
         if( Is_usb_bconnection_error_interrupt()||Is_usb_vbus_error_interrupt())
         {
            Usb_ack_bconnection_error_interrupt();
            Usb_ack_vbus_error_interrupt();
            Host_clear_vbus_request();
         }
         Usb_disable_vbus_pad();
         Usb_enable_manual_vbus();
         if(Is_usb_srp_interrupt())
         {
            Usb_ack_srp_interrupt();
            Usb_enable_vbus_pad();
            Usb_enable_vbus();
            device_state=DEVICE_ATTACHED;
         }
#else
         Usb_enable_vbus();                    // Give at least device power supply!!!
         if(Is_usb_vbus_high())
         { device_state=DEVICE_ATTACHED; }     // If VBUS ok goto to device connection expectation
#endif
      break;

     //------------------------------------------------------
     //   DEVICE_ATTACHED state
     //
     //   - Vbus is on
     //   - Try to detected device connection
     //
      case DEVICE_ATTACHED :
         if (Is_device_connection() || (force_enumeration==TRUE))     // Device pull-up detected
         {
            Host_ack_device_connection();
            Host_clear_device_supported();        // Reset Device status
            Host_clear_configured();
            Host_clear_device_ready();
            Usb_clear_all_event();                // Clear all software events
            new_device_connected=FALSE;
            force_enumeration=FALSE;

           // Now device is connected, enable disconnection interrupt
            Host_enable_device_disconnection_interrupt();
            Enable_interrupt();
           // Reset device status
            Host_clear_device_supported();
            Host_clear_configured();
            Host_clear_device_ready();
            Host_enable_sof();            // Start Start Of Frame generation
            Host_enable_sof_interrupt();  // SOF will be detected under interrupt
            c = 0;
            while (c<100)               // wait 100ms before USB reset
            {
               if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }// Count Start Of frame
               if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {goto device_attached_error;}
            }
            Host_disable_device_disconnection_interrupt();
            Host_send_reset();          // First USB reset
            Usb_ack_event(EVT_HOST_SOF);
            while (Is_host_reset());    // Active wait of end of reset send
            Host_ack_reset();
            //Workaround for some bugly devices with powerless pull up
            //usually low speed where data line rise slowly and can be interpretaded as disconnection
            for(c=0;c!=0xFFFF;c++)    // Basic Timeout counter
            {
               if(Is_usb_event(EVT_HOST_SOF))   //If we detect SOF, device is still alive and connected, just clear false disconnect flag
               {
                  if(Is_device_disconnection())
                  {
                      Host_ack_device_connection();
                      Host_ack_device_disconnection();
                      break;
                  }
               }
            }
            Host_enable_device_disconnection_interrupt();
            // All USB pipes must be reconfigured after a USB reset generation
            host_configure_pipe(PIPE_CONTROL, \
                                            TYPE_CONTROL, \
                                            TOKEN_SETUP,  \
                                            EP_CONTROL,   \
                                            SIZE_64,      \
                                            ONE_BANK,     \
                                            0             );            
            c = 0;
            while (c<100)               // wait 100ms after USB reset
            {
               if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }// Count Start Of frame
               if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {goto device_attached_error;}
            }
            device_state = DEVICE_POWERED;
            c=0;
         }
         device_attached_error:
        // Device connection error, or vbus pb -> Retry the connection process from the begining
         if( Is_usb_bconnection_error_interrupt()||Is_usb_vbus_error_interrupt()||Is_usb_vbus_low())
         {
            Usb_ack_bconnection_error_interrupt();
            Usb_enable_vbus_hw_control();
            device_state=DEVICE_UNATTACHED;
            Usb_disable_vbus();
            Usb_disable_vbus_pad();
            Usb_enable_vbus_pad();
            Usb_ack_vbus_error_interrupt();
            Usb_enable_vbus();
            Usb_disable_vbus_hw_control();
            Host_disable_sof();
         }
         break;

     //------------------------------------------------------
     //   DEVICE_POWERED state
     //
     //   - Device connection (attach) as been detected,
     //   - Wait 100ms and configure default control pipe
     //
      case DEVICE_POWERED :
         LOG_STR_CODE(log_device_connected);
         Host_device_connection_action();
         if (Is_usb_event(EVT_HOST_SOF))
         {
            Usb_ack_event(EVT_HOST_SOF);
            if (c++ >= 100)                          // Wait 100ms
            {
               device_state = DEVICE_DEFAULT;
            }
         }
         break;

     //------------------------------------------------------
     //   DEVICE_DEFAULT state
     //
     //   - Get device descriptor
     //   - Reconfigure Pipe 0 according to Device EP0
     //   - Attribute device address
     //
      case DEVICE_DEFAULT :
        // Get first device descriptor
         Host_select_device(0);
         usb_tree.device[0].ep_ctrl_size=8;
         if( CONTROL_GOOD == host_get_device_descriptor_uncomplete())
         {
            c = 0;
            while(c<20)           // wait 20ms before USB reset (special buggly devices...)
            {
               if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }
               if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt())  {break;}
            }
            Host_disable_device_disconnection_interrupt();
            Host_send_reset();          // First USB reset
            Usb_ack_event(EVT_HOST_SOF);
            while (Is_host_reset());    // Active wait of end of reset send
            Host_ack_reset();
            //Workaround for some bugly devices with powerless pull up
            //usually low speed where data line rise slowly and can be interpretaded as disconnection
            for(c=0;c!=0xFFFF;c++)    // Basic Timeout counter
            {
               if(Is_usb_event(EVT_HOST_SOF))   //If we detect SOF, device is still alive and connected, just clear false disconnect flag
               {
                  if(Is_device_disconnection())
                  {
                      Host_ack_device_connection();
                      Host_ack_device_disconnection();
                      break;
                  }
               }
            }
            Host_enable_device_disconnection_interrupt();
            c = 0;
            host_configure_pipe(PIPE_CONTROL, \
                                            TYPE_CONTROL, \
                                            TOKEN_SETUP,  \
                                            EP_CONTROL,   \
                                            SIZE_64,      \
                                            ONE_BANK,     \
                                            0             );            
            while(c<200)           // wait 200ms after USB reset
            {
               if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }
               if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt())  {break;}
            }
            usb_tree.device[0].ep_ctrl_size=data_stage[OFFSET_FIELD_MAXPACKETSIZE];
            
            // Give an absolute device address
            host_set_address(DEVICE_BASE_ADDRESS);
            usb_tree.device[0].device_address=DEVICE_BASE_ADDRESS;
            device_state = DEVICE_ADDRESSED;
         }
         else
         {  device_state = DEVICE_ERROR; }
         break;

     //------------------------------------------------------
     //   DEVICE_BASE_ADDRESSED state
     //
     //   - Check if VID PID is in supported list
     //
      case DEVICE_ADDRESSED :
         if (CONTROL_GOOD == host_get_device_descriptor())
         {
           // Detect if the device connected belongs to the supported devices table
            if (HOST_TRUE == host_check_VID_PID())
            {
               Host_set_device_supported();
               Host_device_supported_action();
               device_state = DEVICE_CONFIGURED;
            }
            else
            {
               #if (HOST_STRICT_VID_PID_TABLE==ENABLE)
                  Host_device_not_supported_action();
                  device_state = DEVICE_ERROR;
               #else
                  device_state = DEVICE_CONFIGURED;
               #endif
            }
         }
         else // Can not get device descriptor
         {  device_state = DEVICE_ERROR; }
         break;

     //------------------------------------------------------
     //   DEVICE_CONFIGURED state
     //
     //   - Configure pipes for the supported interface
     //   - Send Set_configuration() request
     //   - Goto full operating mode (device ready)
     //
      case DEVICE_CONFIGURED :
         if (CONTROL_GOOD == host_get_configuration_descriptor())
         {
            if (HOST_FALSE != host_check_class()) // Class support OK?
            {
               usb_tree.nb_device++;
            #if (HOST_AUTO_CFG_ENDPOINT==ENABLE)
               if(host_auto_configure_endpoint())
            #else
               Host_set_configured();     // Assumes config is OK with user config
               if(User_configure_endpoint()) // User call here instead of autoconfig
            #endif
               {
                  if (CONTROL_GOOD== host_set_configuration(1))  // Send Set_configuration
                  {
                     //host_set_interface(interface_bound,interface_bound_alt_set);
                     // device and host are now fully configured
                     // goto DEVICE READY normal operation
                      device_state = DEVICE_READY;
                      Host_set_device_ready();
                     // monitor device disconnection under interrupt
                      Host_enable_device_disconnection_interrupt();
                     // If user host application requires SOF interrupt event
                     // Keep SOF interrupt enable otherwize, disable this interrupt
                  #if (HOST_CONTINUOUS_SOF_INTERRUPT==DISABLE && USB_HUB_SUPPORT==DISABLE)
                      Host_disable_sof_interrupt();
                  #endif
                  #if (USB_HUB_SUPPORT==ENABLE)
                      // Check if the connected device is a hub
                      if(Get_class(0)==HUB_CLASS && Get_subclass(0)==0x00 && Get_protocol(0)==0x00)
                      {
                           // Get hub descriptor
                           if( Get_hub_descriptor()==CONTROL_GOOD)
                           {
                              // Power each port of the hub
                              i=data_stage[NB_PORT_OFFSET];
                              for(c=1;c<=i;c++)
                              {
                                 Set_port_feature(PORT_POWER,c);
                              }
                              nb_hub_present = 1;
                              hub_device_address[0]=DEVICE_BASE_ADDRESS;
                              hub_init(nb_hub_present-1);    
                           }
                      }
                      else
                      {
                         nb_hub_present = 0;
                         new_device_connected=TRUE;
                      }
                  #else
                      new_device_connected=TRUE;
                  #endif
                      
                      Enable_interrupt();
                      LOG_STR_CODE(log_device_enumerated);
                  }
                  else// Problem during Set_configuration request...
                  {   device_state = DEVICE_ERROR;  }
               }
            }
            else // device class not supported...
            {
                device_state = DEVICE_ERROR;
                LOG_STR_CODE(log_device_unsupported);
                Host_device_class_not_supported_action();
            }
         }
         else // Can not get configuration descriptors...
         {  device_state = DEVICE_ERROR; }
         break;

     //------------------------------------------------------
     //   DEVICE_READY state
     //
     //   - Full std operatinf mode
     //   - Nothing to do...
     //
      case DEVICE_READY:     // Host full std operating mode!
         new_device_connected=FALSE;
         
      #if (USB_HUB_SUPPORT==ENABLE)
         f_hub_port_disconnect=FALSE;
         // If one hub is present in the USB tree and the period interval
         // for the interrupt hub endpoint occurs
         if(nb_hub_present && hub_interrupt_sof==0)
         {
            saved_device=selected_device;      // Backup user selected device
            for(j=1;j<=nb_hub_present;j++)
            {
               for(i=0;i<MAX_DEVICE_IN_USB_TREE;i++)
               {
                  if(usb_tree.device[i].device_address==hub_device_address[j-1]) break;
               }
               Host_select_device(i);
               Host_select_pipe(usb_tree.device[i].interface[0].ep[0].pipe_number);
               Host_ack_nak_received();
               Host_ack_in_received();
               Host_unfreeze_pipe();
               Host_send_in();
               while(1)
               {
                   if(Is_host_nak_received())   break;
                   if(Is_host_emergency_exit()) break;
                   if(Is_host_in_received())    break;
               }
               Host_freeze_pipe();
               if(Is_host_nak_received())
               {
                  Host_ack_nak_received();
               }
               if(Is_host_in_received())
               {
                  if(Is_host_stall()==FALSE)
                  {
                     c=Host_read_byte();
                  }
                  Host_ack_in_received();
                  hub_manage_port_change_status(c,j);
               }
            } // for all hub 
            Host_select_device(saved_device);  // Restore user selected device
            #if (USER_PERIODIC_PIPE==ENABLE)
            unfreeze_user_periodic_pipe();
            #endif
         }
      #endif
         break;

     //------------------------------------------------------
     //   DEVICE_ERROR state
     //
     //   - Error state
     //   - Do custom action call (probably go to default mode...)
     //
      case DEVICE_ERROR :    // TODO !!!!
      #if (HOST_ERROR_RESTART==ENABLE)
         device_state=DEVICE_UNATTACHED;
      #endif
         Host_device_error_action();
         break;

     //------------------------------------------------------
     //   DEVICE_SUSPENDED state
     //
     //   - Host application request to suspend the device activity
     //   - State machine comes here thanks to Host_request_suspend()
     //
      case DEVICE_SUSPENDED :
         if(Is_device_supports_remote_wakeup()) // If the connected device supports remote wake up
         {
           host_set_feature_remote_wakeup();    // Enable this feature...
         }
         LOG_STR_CODE(log_going_to_suspend);
         c = Is_host_sof_interrupt_enabled(); //Save current sof interrupt enable state
         Host_disable_sof_interrupt();
         Host_ack_sof();
         Host_disable_sof();           // Stop start of frame generation, this generates the suspend state
         Host_ack_hwup();
         Host_enable_hwup_interrupt(); // Enable host wake-up interrupt
                                       // (this is the unique USB interrupt able to wake up the CPU core from power-down mode)
         Usb_freeze_clock();
         Stop_pll();
         Host_suspend_action();              // Custom action here! (for example go to power-save mode...)
         device_state=DEVICE_WAIT_RESUME;    // wait for device resume event
         break;

     //------------------------------------------------------
     //   DEVICE_WAIT_RESUME state
     //
     //   - Wait in this state till the host receives an upstream resume from the device
     //   - or the host software request the device to resume
     //
      case DEVICE_WAIT_RESUME :
         if(Is_usb_event(EVT_HOST_HWUP)|| Is_host_request_resume())// Remote wake up has been detected
                                                                 // or Local resume request has been received
         {
            if(Is_host_request_resume())       // Not a remote wakeup, but an host application request
            {
               Host_disable_hwup_interrupt();  // Wake up interrupt should be disable host is now wake up !
              // CAUTION HWUP can be cleared only when USB clock is active
               Pll_start_auto();               // First Restart the PLL for USB operation
               Wait_pll_ready();               // Get sure pll is lock
               Usb_unfreeze_clock();           // Enable clock on USB interface
               Host_ack_hwup();                // Clear HWUP interrupt flag
            }
            Host_enable_sof();
            Host_send_resume();                            // Send down stream resume
            while (Is_host_down_stream_resume()==FALSE);   // Wait Down stream resume sent
            Host_ack_remote_wakeup();        // Ack remote wake-up reception
            Host_ack_request_resume();       // Ack software request
            Host_ack_down_stream_resume();   // Ack down stream resume sent
            Usb_ack_event(EVT_HOST_HWUP);    // Ack software event
            if(c) { Host_enable_sof_interrupt(); } // Restore SOF interrupt enable state before suspend
            device_state=DEVICE_READY;       // Come back to full operating mode
            LOG_STR_CODE(log_usb_resumed);
         }
         break;

     //------------------------------------------------------
     //   DEVICE_DISCONNECTED state
     //
     //   - Device disconnection has been detected
     //   - Run scheduler in this state at least two times to get sure event is detected by all host application tasks
     //   - Go to DEVICE_DISCONNECTED_ACK state before DEVICE_UNATTACHED, to get sure scheduler calls all app tasks...
     //
      case DEVICE_DISCONNECTED :
         device_state = DEVICE_DISCONNECTED_ACK;
         break;

     //------------------------------------------------------
     //   DEVICE_DISCONNECTED_ACK state
     //
     //   - Device disconnection has been detected and managed bu applicatives tasks
     //   - Go to DEVICE_UNATTACHED state
     //
      case DEVICE_DISCONNECTED_ACK :
         device_state = DEVICE_UNATTACHED;
         break;

     //------------------------------------------------------
     //   default state
     //
     //   - Default case: ERROR
     //   - Goto no device state
     //
      default :
         device_state = DEVICE_UNATTACHED;
         break;
      }
}