usb_task.c

基于at90usb1287的数据存储器例子

 //!
//! @file usb_task.c,v
//!
//! Copyright (c) 2006 Atmel.
//!
//! Please read file license.txt for copyright notice.
//!
//! @brief This file manages the USB task either device/host or both.
//!
//! The USB task selects the correct USB task (usb_device task or usb_host task
//! to be executed depending on the current mode available.
//!
//! According to USB_DEVICE_FEATURE and USB_HOST_FEATURE value (located in conf_usb.h file)
//! The usb_task can be configured to support USB DEVICE mode or USB Host mode or both
//! for a dual role device application.
//!
//! This module also contains the general USB interrupt subroutine. This subroutine is used
//! to detect asynchronous USB events.
//!
//! Note:
//!   - The usb_task belongs to the scheduler, the usb_device_task and usb_host do not, they are called
//!     from the general usb_task
//!   - See conf_usb.h file for more details about the configuration of this module
//!
//!
//! @version 1.28 at90usb128-usbkey-demo-storage-df-1_0_4 $Id: usb_task.c,v 1.28 2006/07/03 11:55:11 rletendu Exp $
//!
//! @todo
//! @bug
//!/

//_____  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"
#if ((USB_DEVICE_FEATURE == ENABLED))
#include "usb_descriptors.h"
#endif
#include "lib_mcu/power/power_drv.h"
#include "lib_mcu/wdt/wdt_drv.h"
#include "lib_mcu/pll/pll_drv.h"

#if ((USB_HOST_FEATURE == ENABLED))
   #include "modules/usb/host_chap9/usb_host_task.h"
   #if (USB_HOST_PIPE_INTERRUPT_TRANSFER == ENABLE)
      extern U8 g_sav_int_sof_enable;
   #endif
#endif

#if ((USB_DEVICE_FEATURE == ENABLED))
   #include "modules/usb/device_chap9/usb_device_task.h"
#endif

#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 ________________________________________________________

#ifndef LOG_STR_CODE
#define LOG_STR_CODE(str)
#else
U8 code log_device_disconnect[]="Device Disconnected";
U8 code log_id_change[]="Pin Id Change";
#endif

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

//!
//! Public : U16 g_usb_event
//! usb_connected is used to store USB events detected upon
//! USB general interrupt subroutine
//! Its value is managed by the following macros (See usb_task.h file)
//! Usb_send_event(x)
//! Usb_ack_event(x)
//! Usb_clear_all_event()
//! Is_usb_event(x)
//! Is_not_usb_event(x)
volatile U16 g_usb_event=0;


#if (USB_DEVICE_FEATURE == ENABLED)
//!
//! Public : (bit) usb_connected
//! usb_connected is set to TRUE when VBUS has been detected
//! usb_connected is set to FALSE otherwise
//! Used with USB_DEVICE_FEATURE == ENABLED only
//!/
extern bit   usb_connected;

//!
//! Public : (U8) usb_configuration_nb
//! Store the number of the USB configuration used by the USB device
//! when its value is different from zero, it means the device mode is enumerated
//! Used with USB_DEVICE_FEATURE == ENABLED only
//!/
extern U8    usb_configuration_nb;
#endif


#if (USB_HOST_FEATURE == ENABLED)
//!
//! Private : (U8) private_sof_counter
//! Incremented  by host SOF interrupt subroutime
//! This counter is used to detect timeout in host requests.
//! It must not be modified by the user application tasks.
//!/
volatile U8 private_sof_counter=0;

   #if (USB_HOST_PIPE_INTERRUPT_TRANSFER == ENABLE)
extern volatile S_pipe_int   it_pipe_str[MAX_EP_NB];
   #endif

#endif

#if ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == ENABLED))
//!
//! Public : (U8) g_usb_mode
//! Used in dual role application (both device/host) to store
//! the current mode the usb controller is operating
//!/
   U8 g_usb_mode=USB_MODE_UNDEFINED;
   U8 g_old_usb_mode;
#endif

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

/**
 * @brief This function initializes the USB proces.
 *
 *  Depending on the mode supported (HOST/DEVICE/DUAL_ROLE) the function
 *  calls the coresponding usb mode initialization function
 *
 *  @param none
 *
 *  @return none
 */
void usb_task_init(void)
{
   #if (USB_HOST_FEATURE == ENABLED && USB_DEVICE_FEATURE == ENABLED)
   U8 delay;
   #endif

   #if (USE_USB_PADS_REGULATOR==ENABLE)  // Otherwise assume USB PADs regulator is not used
   Usb_enable_regulator();
   #endif

// ---- DUAL ROLE DEVICE USB MODE ---------------------------------------------
#if ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == ENABLED))
   Usb_enable_uid_pin();
   delay=PORTA;
   g_usb_mode=USB_MODE_UNDEFINED;
   if(Is_usb_id_device())
   {
     g_usb_mode=USB_MODE_DEVICE;
     usb_device_task_init();
   }
   else
   {
     g_usb_mode=USB_MODE_HOST;
     Usb_ack_id_transition(); // REQUIRED !!! Startup with ID=0, Ack ID pin transistion (default hwd start up is device mode)
     Usb_enable_id_interrupt();
     Enable_interrupt();
     usb_host_task_init();
   }
   g_old_usb_mode=g_usb_mode;   // Store current usb mode, for mode change detection
// -----------------------------------------------------------------------------

// ---- DEVICE ONLY USB MODE ---------------------------------------------------
#elif ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == DISABLE))
   Usb_force_device_mode();
   usb_device_task_init();
// -----------------------------------------------------------------------------

// ---- REDUCED HOST ONLY USB MODE ---------------------------------------------
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == ENABLED))
   Usb_force_host_mode();
   usb_host_task_init();
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == DISABLE))
   #error  at least one of USB_DEVICE_FEATURE or USB_HOST_FEATURE should be enabled
#endif
// -----------------------------------------------------------------------------


}

/**
 *  @brief Entry point of the USB mamnagement
 *
 *  Depending on the USB mode supported (HOST/DEVICE/DUAL_ROLE) the function
 *  calls the coresponding usb management function.
 *
 *  @param none
 *
 *  @return none
*/
void usb_task(void)
{
// ---- DUAL ROLE DEVICE USB MODE ---------------------------------------------
#if ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == ENABLED))
   if(Is_usb_id_device())
   { g_usb_mode=USB_MODE_DEVICE;}
   else
   { g_usb_mode=USB_MODE_HOST;}
  // TODO !!! ID pin hot state change
  // Preliminary management: HARDWARE RESET !!!
   #if ( ID_PIN_CHANGE_GENERATE_RESET == ENABLE)
     // Hot ID transition generates wdt reset
      if((g_old_usb_mode!=g_usb_mode))
      #ifndef  AVRGCC
         {Wdt_change_16ms(); while(1);   LOG_STR_CODE(log_id_change);}
      #else
         {Wdt_change_enable(); while(1); LOG_STR_CODE(log_id_change);}
      #endif

   #endif
  g_old_usb_mode=g_usb_mode;   // Store current usb mode, for mode change detection
  // Depending on current usb mode, launch the correct usb task (device or host)
   switch(g_usb_mode)
   {
      case USB_MODE_DEVICE:
         usb_device_task();
         break;
      case USB_MODE_HOST:
         usb_host_task();
         break;
      case USB_MODE_UNDEFINED:  // No break !
      default:
         break;
  }
// -----------------------------------------------------------------------------

// ---- DEVICE ONLY USB MODE ---------------------------------------------------
#elif ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == DISABLE))
   usb_device_task();
// -----------------------------------------------------------------------------