usb_task.c

用AT89C5131A开发USB的框架很好用

//!
//! @file usb_task.c
//!
//! Copyright (c) 2004
//!
//! Please read file license.txt for copyright notice.
//!
//! @brief This file manages the USB controller.
//!
//! The USB task checks the income of new requests from the USB Host.
//! When a Setup request occurs, this task will launch the processing
//! of this setup contained in the usb_enum.c file.
//! Other class specific requests are also processed in this file.
//! This file manages all the USB events:
//! Suspend / Resume / Reset / Start Of Frame / Wake Up / Vbus events
//!
//! @version 1.10.2.2 (c5131-usb-generic-1_2_0)
//!
//! @todo
//! @bug
//!/

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

#include "config.h"
#include "conf\conf_usb.h"
#include "usb_task.h"
#include "lib_mcu\usb\usb_drv.h"
#include "modules\usb\usb_enum.h"
#include "intrins.h"


//_____ M A C R O S ________________________________________________________

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

//!
//! Public : (bit) usb_connected
//! usb_connected is set to TRUE when VBUS has been detected
//! usb_connected is set to FALSE otherwise
//!/
volatile bit      usb_connected;
U8 xdata          sof_counter;
volatile U8 data  toggle_next_time;

extern _MEM_TYPE_SLOW_ U8  usb_configuration_nb;

volatile bit      usb_continuous_mode;
U8                send_free = 0;

S_hid_set_control SetControlBytes;

//_____ D E C L A R A T I O N S ____________________________________________
//!
//! @brief This function initializes the USB the associated variables.
//!
//! This function enables the USB controller and init the USB interrupts.
//! The aim is to allow the USB connection detection in order to send
//! the appropriate USB event to the operating mode manager.
//!
//! @warning Code:?? bytes (function code length)
//!
//! @param none
//!
//! @return none
//!
//!/
void usb_task_init(void)
{
   Set_page_usb();
   Usb_enable();                      // enable the USB controller
   usb_start_device();
   sof_counter = 0;
   usb_connected = TRUE;
   toggle_next_time = 0;
   usb_continuous_mode = FALSE;
}



//!
//! @brief This function initializes the USB device controller
//!
//! This function enables the USB controller and init the USB interrupts.
//! The aim is to allow the USB connection detection in order to send
//! the appropriate USB event to the operating mode manager.
//!
//! @warning Code:?? bytes (function code length)
//!
//! @param none
//!
//! @return none
//!
//!/
void usb_start_device (void)
{
U16 c;
   usb_generate_clock();
   Set_page_usb(); 
   Usb_unfreeze_clock();
   Usb_set_speed();             // for speed analysis
   Usb_ack_suspend();
   Usb_detach();
   for (c=0; c<1000; c++);
   Usb_attach();
   Usb_enable_suspend_interrupt();
   Usb_enable_resume_interrupt();
   Usb_enable_reset_interrupt();
   Usb_enable_wake_up_interrupt();
   Usb_enable_sof_interrupt();
   Enable_usb_interrupt();   
   Enable_interrupt();
   usb_init_device();         // configure the USB controller EP0

   Usb_attach();
}

//! @brief Entry point of the USB mamnagement
//!
//! This function is the entry point of the USB management. Each USB
//! event is checked here in order to launch the appropriate action.
//! If a Setup request occurs on the Default Control Endpoint,
//! the usb_process_request() function is call in the usb_enum.c file
//! If a new USB mass storage Command Block Wrapper (CBW) occurs,
//! this one will be decoded and the SCSI command will be taken in charge
//! by the scsi decoder.
//!
//! @warning Code:?? bytes (function code length)
//!
//! @param none
//!
//! @return none
void usb_task(void)
{
   if (!usb_connected)         /* power down mode when USB not connected */
   { 
      Pll_stop();           /* disable PLL before going in power down mode */
      Enable_interrupt();

      // Shutdown board ressources
      Led_all_off();
      Disable_ale();
      if (!usb_connected)
      {
         Usb_suspend_action();    // see in conf_usb.h
         _nop_();
		}
   }
   else //USB Connected
   {
    // USB MANAGEMENT

    Set_page_usb ();

    Usb_select_endpoint(EP_CONTROL);
    if (Is_usb_receive_setup())
    {
      usb_process_request();
      if(SetControlBytes.type==0) { usb_continuous_mode = FALSE; }
      if(SetControlBytes.type==1) { usb_continuous_mode = TRUE ; }

    }  
 //!
 //! this part of the code can be modify following the application
 //!

    if(usb_continuous_mode == TRUE)
    {
       Usb_select_endpoint(EP_HID_IN);
       if(Is_usb_in_ready())
       {
          send_free = 1;
          Usb_ack_in_ready();
       }
    }

 //!
 //! end of modification
 //!
   }
}


//! @brief USB interrupt process
//!
//! This function is called each time a USB interrupt occurs.
//! The following USB events are taken in charge:
//! - Suspend
//! - Wake-Up
//! - Reset
//! For each event, the user can launch an action by completing
//! the associate define
//!
//! @warning Code:?? bytes (function code length)
//!
//! @param none
//!
//! @return none
void usb_interrupt(void) interrupt IRQ_USB
{
   if (Is_usb_sof())
   {
      Usb_ack_sof();
      sof_counter++;
      if (usb_continuous_mode == FALSE) 
      {
         if (sof_counter == 0x40)
         {
            Switch_ale();
            sof_counter = 0;
         }
      }
      else
      {
         if (sof_counter == 0xFF)
         {
            Switch_ale();
         }
      }
      return;
   }

  if (Is_usb_suspend())
  {
    Usb_ack_suspend();
    Usb_freeze_clock();
    usb_connected = FALSE;
  }
  
  if (Is_usb_wake_up())
  {
    if (!usb_connected)      /* reconfigure PLL when exiting power down mode */
    {
       Pll_enable();
    }
    Usb_unfreeze_clock();
    Enable_ale();
    Usb_ack_suspend();
	 Usb_ack_wake_up();   	    
	 usb_connected = TRUE;
  }  
  
  if (Is_usb_reset()) 
  {  
     Usb_ack_reset();
     usb_enum_var_init();
     Usb_enable_suspend_interrupt();
     Usb_enable_wake_up_interrupt();
     Usb_enable_sof_interrupt();
     usb_connected = TRUE;
  }
}