usb_task.c

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//_____  I N C L U D E S ___________________________________________________

#include "config.h"
#include "conf_usb.h"
#include "usb_task.h"
#include "lib_mcu/usb/usb_drv.h"
#include "usb_descriptors.h"
#include "lib_mcu/power/power_drv.h"
#include "lib_mcu/wdt/wdt_drv.h"
#include "lib_mcu/pll/pll_drv.h"
#include "modules/usb/device_chap9/usb_device_task.h"

#ifndef  USE_USB_PADS_REGULATOR
   #error "USE_USB_PADS_REGULATOR" should be defined as ENABLE or DISABLE in conf_usb.h file
#endif

//_____ M A C R O S ________________________________________________________



//_____ D E F I N I T I O N S ______________________________________________

volatile U16 g_usb_event=0;


#if (USB_DEVICE_FEATURE == ENABLED)






extern bit   usb_connected;

extern U8    usb_configuration_nb;

extern U8 remote_wakeup_feature;

#ifdef WA_USB_SUSPEND_PERTUBATION
volatile U16 delay_usb;
void usb_delay_ms(U8 ms);
#endif
#endif

//_____ D E C L A R A T I O N S ____________________________________________

void usb_task_init(void)
{
   #if (USE_USB_PADS_REGULATOR==ENABLE)  // Otherwise assume USB PADs regulator is not used
   Usb_enable_regulator();
   #endif
   usb_device_task_init();
}

void usb_task(void)
{
   usb_device_task();
}

#ifdef __GNUC__
 ISR(USB_GEN_vect)
#else
#pragma vector = USB_General_vect
__interrupt void usb_general_interrupt()
#endif
{
  // - Device start of frame received
   if (Is_usb_sof() && Is_sof_interrupt_enabled())
   {
      Usb_ack_sof();
      Usb_sof_action();
   }
  // - Detection of VBus transition from USB Host
   if (Is_usb_vbus_transition() && Is_usb_vbus_interrupt_enabled())
   {
#ifdef Usb_vbus_it_action
      Usb_vbus_it_action();
#endif
   }
  // - Device Suspend event (no more USB activity detected)
   if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
   {
      usb_suspended=TRUE;
      Usb_ack_wake_up();                 // clear wake up to detect next event
      Usb_send_event(EVT_USB_SUSPEND);
      Usb_ack_suspend();
#ifndef USB_WAKEUP_POOLING
      Usb_enable_wake_up_interrupt();
#endif
      Usb_disable_resume_interrupt();
      Usb_freeze_clock();
      Stop_pll();
      Usb_suspend_action();
   }
  // - Wake up event (USB activity detected): Used to resume
   if (Is_usb_wake_up() && Is_wake_up_interrupt_enabled())
   {
      if(Is_pll_ready()==FALSE)
      {
         #ifdef USE_USB_AUTOBAUD
            usb_autobaud();
         #else
            Pll_start_auto();
         #endif
         Wait_pll_ready();
      }
      Usb_unfreeze_clock();
      Usb_ack_wake_up();
      if(usb_suspended)
      {
#ifdef WA_USB_SUSPEND_PERTUBATION
         Usb_enable_resume_interrupt();
         Usb_enable_reset_interrupt();
         while(Is_usb_wake_up())
         {
            Usb_ack_wake_up();
         }
         usb_delay_ms(2);
         if(Is_usb_sof() || Is_usb_resume() || Is_usb_reset() )
         {
            Usb_disable_wake_up_interrupt();
            Usb_wake_up_action();
            Usb_send_event(EVT_USB_WAKE_UP);
            Usb_enable_suspend_interrupt();
            Usb_enable_resume_interrupt();
            Usb_enable_reset_interrupt();

         }
         else // Workarround to make the USB enter power down mode again (spurious transcient detected on the USB lines)
         {
            Usb_ack_wake_up();                 // clear wake up to detect next event
            Usb_send_event(EVT_USB_SUSPEND);
            Usb_ack_suspend();
            Usb_enable_wake_up_interrupt();
            Usb_disable_resume_interrupt();
            Usb_freeze_clock();
            Stop_pll();
            Usb_suspend_action();
         }
#else
         Usb_enable_resume_interrupt();
         Usb_enable_reset_interrupt();
         Usb_ack_wake_up();
         Usb_disable_wake_up_interrupt();
         Usb_wake_up_action();
         Usb_send_event(EVT_USB_WAKE_UP);
         Usb_enable_suspend_interrupt();
         Usb_enable_resume_interrupt();
         Usb_enable_reset_interrupt();
#endif
      }
   }
  // - Resume state bus detection
   if (Is_usb_resume() && Is_resume_interrupt_enabled())
   {
      usb_suspended = FALSE;
      Usb_disable_wake_up_interrupt();
      Usb_ack_resume();
      Usb_disable_resume_interrupt();
      Usb_resume_action();
      Usb_send_event(EVT_USB_RESUME);
   }
  // - USB bus reset detection
   if (Is_usb_reset()&& Is_reset_interrupt_enabled())
   {
      Usb_ack_reset();
      usb_init_device();
      Usb_reset_action();
      Usb_send_event(EVT_USB_RESET);
   }

}


#ifdef WA_USB_SUSPEND_PERTUBATION
void usb_delay_ms(U8 ms)
{
   for(;ms;ms--)
   {
      for(delay_usb=0;delay_usb<FOSC/16;delay_usb++);
   }
}
#endif