usb_device_task.c

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

#include "config.h"
#include "conf_usb.h"
#include "usb_device_task.h"
#include "modules/usb/usb_task.h"
#include "lib_mcu/usb/usb_drv.h"
#include "usb_descriptors.h"
#include "modules/usb/device_chap9/usb_standard_request.h"
#include "lib_mcu/pll/pll_drv.h"
#ifdef USE_USB_AUTOBAUD
#include "lib_mcu/wdt/wdt_drv.h"
#endif

//_____ M A C R O S ________________________________________________________

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

bit   usb_connected=FALSE;

bit   usb_suspended=FALSE;




extern U8  usb_configuration_nb;

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

void usb_device_task_init(void)
{
   Usb_disable();
   Usb_enable();
#if (USB_LOW_SPEED_DEVICE==ENABLE)
   Usb_low_speed_mode();
#endif
   Usb_enable_vbus_pad();
   Enable_interrupt();
}

void usb_start_device (void)
{
   Usb_freeze_clock();
#ifndef USE_USB_AUTOBAUD
   Pll_start_auto();
#else
   usb_autobaud();
#endif
   Wait_pll_ready();
   Disable_interrupt();
   Usb_unfreeze_clock();
   Usb_attach();
#if (USB_RESET_CPU == ENABLED)
   Usb_reset_all_system();
#else
   Usb_reset_macro_only();
#endif
   usb_init_device();         // configure the USB controller EP0
   Usb_enable_suspend_interrupt();
   Usb_enable_reset_interrupt();
   Enable_interrupt();
}

void usb_device_task(void)
{
   //- VBUS state detection
   if (Is_usb_vbus_high()&& (usb_connected==FALSE))
   {
      usb_connected = TRUE;
      Usb_send_event(EVT_USB_POWERED);
      Usb_vbus_on_action();
      Usb_enable();
      usb_start_device();
      Usb_attach();
   }
   if (Is_usb_vbus_low()&& (usb_connected==TRUE))
   {
      usb_connected = FALSE;
      usb_configuration_nb = 0;
      Usb_send_event(EVT_USB_UNPOWERED);
      Usb_detach();
      Usb_freeze_clock();
      Usb_vbus_off_action();
   }

   if(Is_usb_event(EVT_USB_RESET))
   {
      Usb_ack_event(EVT_USB_RESET);
      Usb_reset_endpoint(0);
      usb_configuration_nb=0;
   }

#ifdef USB_WAKEUP_POOLING
  // - Wake up event (USB activity detected): Used to resume
   if (Is_usb_wake_up() && (Is_pll_ready()==FALSE))
   {
      Pll_start_auto();
      Wait_pll_ready();
      Usb_unfreeze_clock();
      Usb_ack_wake_up();
      Usb_wake_up_action();
      Usb_send_event(EVT_USB_WAKE_UP);
      Usb_enable_suspend_interrupt();
   }
#endif

   // =======================================
   // Common Standard Device Control Requests
   // =======================================
   //   - device enumeration process
   //   - device control commands and features
   Usb_select_endpoint(EP_CONTROL);
   if (Is_usb_receive_setup())
   {
      usb_process_request();
   }
}


#ifdef USE_USB_AUTOBAUD
#warning CAUTION Preliminary USB autobaud for USB DFU bootloader Only... 












void usb_autobaud(void)
{

   U16 count_rc=0;

   volatile U16 tempo;
   
   wdtdrv_interrupt_enable(WDTO_16MS);
   TCCR1B=0x00; TCCR1A=0x00;
   TCNT1=0x00;  TIFR1=0x01;            
   
   TCCR1B|=(1<<CS01) |(1<<CS00);       // ClkIO/64, with prescaler /2 -> XTAL/128

   while(Is_not_wdt_interrupt());
   Wdt_ack_interrupt();
   TCCR1B=0;
   wdtdrv_disable();

   
   count_rc=TCNT1;
   TCCR1B=0x00; TCCR1A=0x00;
   TCNT1=0x00;  TIFR1=0x01;            
   if(count_rc>1500)                   // 16MHz/128 with 16ms watchdog gives 2000 ticks
   {
      Start_pll(PLL_IN_PRESCAL_ENABLE);               
   }
   else
   {
      Start_pll(PLL_IN_PRESCAL_DISABLE);                
   }
   
}
#endif