usb_task.c

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00001 /*This file has been prepared for Doxygen automatic documentation generation.*/
00025 
00026 /* Copyright (c) 2007, Atmel Corporation All rights reserved.
00027  *
00028  * Redistribution and use in source and binary forms, with or without
00029  * modification, are permitted provided that the following conditions are met:
00030  *
00031  * 1. Redistributions of source code must retain the above copyright notice,
00032  * this list of conditions and the following disclaimer.
00033  *
00034  * 2. Redistributions in binary form must reproduce the above copyright notice,
00035  * this list of conditions and the following disclaimer in the documentation
00036  * and/or other materials provided with the distribution.
00037  *
00038  * 3. The name of ATMEL may not be used to endorse or promote products derived
00039  * from this software without specific prior written permission.
00040  *
00041  * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
00042  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00043  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
00044  * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
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00050  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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00052 
00053 //_____  I N C L U D E S ___________________________________________________
00054 
00055 #include "config.h"
00056 #include "conf_usb.h"
00057 #include "usb_task.h"
00058 #include "lib_mcu/usb/usb_drv.h"
00059 #include "usb_descriptors.h"
00060 #include "lib_mcu/power/power_drv.h"
00061 #include "lib_mcu/wdt/wdt_drv.h"
00062 #include "lib_mcu/pll/pll_drv.h"
00063 #include "modules/usb/device_chap9/usb_device_task.h"
00064 
00065 #ifndef  USE_USB_PADS_REGULATOR
00066    #error "USE_USB_PADS_REGULATOR" should be defined as ENABLE or DISABLE in conf_usb.h file
00067 #endif
00068 
00069 //_____ M A C R O S ________________________________________________________
00070 
00071 
00072 
00073 //_____ D E F I N I T I O N S ______________________________________________
00074 
00085 volatile U16 g_usb_event=0;
00086 
00087 
00088 #if (USB_DEVICE_FEATURE == ENABLED)
00095 extern bit   usb_connected;
00096 
00103 extern U8    usb_configuration_nb;
00104 
00109 extern U8 remote_wakeup_feature;
00110 
00111 volatile U16 delay_usb;
00112 void usb_delay_ms(U8 ms);
00113 #endif
00114 
00115 
00116 
00117 //_____ D E C L A R A T I O N S ____________________________________________
00118 
00128 void usb_task_init(void)
00129 {
00130    #if (USE_USB_PADS_REGULATOR==ENABLE)  // Otherwise assume USB PADs regulator is not used
00131    Usb_enable_regulator();
00132    #endif
00133    usb_device_task_init();
00134 }
00135 
00145 void usb_task(void)
00146 {
00147    usb_device_task();
00148 }
00149 
00168 #ifdef __GNUC__
00169  ISR(USB_GEN_vect)
00170 #else
00171 #pragma vector = USB_General_vect
00172 __interrupt void usb_general_interrupt()
00173 #endif
00174 {
00175   // - Device start of frame received
00176    if (Is_usb_sof() && Is_sof_interrupt_enabled())
00177    {
00178       Usb_ack_sof();
00179       Usb_sof_action();
00180    }
00181   // - Device Suspend event (no more USB activity detected)
00182    if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
00183    {
00184       usb_suspended=TRUE;
00185       Usb_ack_wake_up();                 // clear wake up to detect next event
00186       Usb_send_event(EVT_USB_SUSPEND);
00187       Usb_ack_suspend();
00188       Usb_enable_wake_up_interrupt();
00189       Usb_disable_resume_interrupt();
00190       Usb_freeze_clock();
00191       Stop_pll();
00192       Usb_suspend_action();
00193    }
00194   // - Wake up event (USB activity detected): Used to resume
00195    if (Is_usb_wake_up() && Is_wake_up_interrupt_enabled())
00196    {
00197       if(Is_pll_ready()==FALSE)
00198       {
00199          #ifdef USE_USB_AUTOBAUD
00200             usb_autobaud();
00201          #else
00202             Pll_start_auto();
00203          #endif
00204          Wait_pll_ready();
00205       }
00206       Usb_unfreeze_clock();
00207       Usb_ack_wake_up();
00208       if(usb_suspended)
00209       {
00210          Usb_enable_resume_interrupt();
00211          Usb_enable_reset_interrupt();
00212          while(Is_usb_wake_up())
00213          {
00214             Usb_ack_wake_up();
00215          }
00216          usb_delay_ms(2);
00217          if(Is_usb_sof() || Is_usb_resume() || Is_usb_reset() )
00218          {
00219             Usb_disable_wake_up_interrupt();
00220             Usb_wake_up_action();
00221             Usb_send_event(EVT_USB_WAKE_UP);
00222             Usb_enable_suspend_interrupt();
00223             Usb_enable_resume_interrupt();
00224             Usb_enable_reset_interrupt();
00225             
00226          }
00227          else // Workarround to make the USB enter power down mode again (spurious transcient detected on the USB lines)
00228          {
00229             if(Is_usb_wake_up()) return;
00230             Usb_drive_dp_low();
00231             Usb_direct_drive_usb_enable();
00232             Usb_direct_drive_disable();
00233             Usb_disable_wake_up_interrupt();
00234          }
00235       }
00236    }
00237   // - Resume state bus detection
00238    if (Is_usb_resume() && Is_resume_interrupt_enabled())
00239    {
00240       usb_suspended = FALSE;
00241       Usb_disable_wake_up_interrupt();
00242       Usb_ack_resume();
00243       Usb_disable_resume_interrupt();
00244       Usb_resume_action();
00245       Usb_send_event(EVT_USB_RESUME);
00246    }
00247   // - USB bus reset detection
00248    if (Is_usb_reset()&& Is_reset_interrupt_enabled())
00249    {
00250       Usb_ack_reset();
00251       usb_init_device();
00252       Usb_reset_action();
00253       Usb_send_event(EVT_USB_RESET);
00254    }
00255 
00256 }
00257 
00258 
00259 void usb_delay_ms(U8 ms)
00260 {
00261    for(;ms;ms--)
00262    {
00263       for(delay_usb=0;delay_usb<FOSC/16;delay_usb++);
00264    }
00265 }

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