usb_task.c File Reference

#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"

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Functions

void usb_delay_ms (U8 ms)
void usb_task_init (void)
void usb_task (void)
__interrupt void usb_general_interrupt ()

Variables

volatile U16 g_usb_event = 0
 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).
bit usb_connected
 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 /.
U8 usb_configuration_nb
 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 /.
U8 remote_wakeup_feature
 Public : (U8) remote_wakeup_feature Store a host request for remote wake up (set feature received) /.
volatile U16 delay_usb


Detailed Description

This file manages the USB task device.

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:

Author:
Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file usb_task.c.


Function Documentation

void usb_delay_ms ( U8  ms  ) 

Definition at line 262 of file usb_task.c.

References delay_usb, and FOSC.

Referenced by usb_general_interrupt().

00263 {
00264    for(;ms;ms--)
00265    {
00266       for(delay_usb=0;delay_usb<FOSC/16;delay_usb++);
00267    }
00268 }

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__interrupt void usb_general_interrupt (  ) 

USB interrupt subroutine This function is called each time a USB interrupt occurs. The following USB DEVICE events are taken in charge:

For each event, the user can launch an action by completing the associate define (See conf_usb.h file to add action upon events)

Note: Only interrupts events that are enabled are processed

Parameters:
none 
Returns:
none

Definition at line 175 of file usb_task.c.

References EVT_USB_RESET, EVT_USB_RESUME, EVT_USB_SUSPEND, EVT_USB_WAKE_UP, FALSE, Is_pll_ready, Is_reset_interrupt_enabled, Is_resume_interrupt_enabled, Is_sof_interrupt_enabled, Is_suspend_interrupt_enabled, Is_usb_reset, Is_usb_resume, Is_usb_sof, Is_usb_suspend, Is_usb_wake_up, Is_wake_up_interrupt_enabled, Stop_pll, TRUE, Usb_ack_reset, Usb_ack_resume, Usb_ack_sof, Usb_ack_suspend, Usb_ack_wake_up, usb_delay_ms(), Usb_direct_drive_disable, Usb_direct_drive_usb_enable, Usb_disable_resume_interrupt, Usb_disable_wake_up_interrupt, Usb_drive_dp_low, Usb_enable_reset_interrupt, Usb_enable_resume_interrupt, Usb_enable_suspend_interrupt, Usb_enable_wake_up_interrupt, Usb_freeze_clock, usb_init_device(), Usb_reset_action, Usb_resume_action, Usb_send_event, Usb_sof_action, Usb_suspend_action, usb_suspended, Usb_unfreeze_clock, Usb_wake_up_action, and Wait_pll_ready.

00177 {
00178   // - Device start of frame received
00179    if (Is_usb_sof() && Is_sof_interrupt_enabled())
00180    {
00181       Usb_ack_sof();
00182       Usb_sof_action();
00183    }
00184   // - Device Suspend event (no more USB activity detected)
00185    if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
00186    {
00187       usb_suspended=TRUE;
00188       Usb_ack_wake_up();                 // clear wake up to detect next event
00189       Usb_send_event(EVT_USB_SUSPEND);
00190       Usb_ack_suspend();
00191       Usb_enable_wake_up_interrupt();
00192       Usb_disable_resume_interrupt();
00193       Usb_freeze_clock();
00194       Stop_pll();
00195       Usb_suspend_action();
00196    }
00197   // - Wake up event (USB activity detected): Used to resume
00198    if (Is_usb_wake_up() && Is_wake_up_interrupt_enabled())
00199    {
00200       if(Is_pll_ready()==FALSE)
00201       {
00202          #ifdef USE_USB_AUTOBAUD
00203             usb_autobaud();
00204          #else
00205             Pll_start_auto();
00206          #endif
00207          Wait_pll_ready();
00208       }
00209       Usb_unfreeze_clock();
00210       Usb_ack_wake_up();
00211       if(usb_suspended)
00212       {
00213          Usb_enable_resume_interrupt();
00214          Usb_enable_reset_interrupt();
00215          while(Is_usb_wake_up())
00216          {
00217             Usb_ack_wake_up();
00218          }
00219          usb_delay_ms(2);
00220          if(Is_usb_sof() || Is_usb_resume() || Is_usb_reset() )
00221          {
00222             Usb_disable_wake_up_interrupt();
00223             Usb_wake_up_action();
00224             Usb_send_event(EVT_USB_WAKE_UP);
00225             Usb_enable_suspend_interrupt();
00226             Usb_enable_resume_interrupt();
00227             Usb_enable_reset_interrupt();
00228             
00229          }
00230          else // Workarround to make the USB enter power down mode again (spurious transcient detected on the USB lines)
00231          {
00232             if(Is_usb_wake_up()) return;
00233             Usb_drive_dp_low();
00234             Usb_direct_drive_usb_enable();
00235             Usb_direct_drive_disable();
00236             Usb_disable_wake_up_interrupt();
00237          }
00238       }
00239    }
00240   // - Resume state bus detection
00241    if (Is_usb_resume() && Is_resume_interrupt_enabled())
00242    {
00243       usb_suspended = FALSE;
00244       Usb_disable_wake_up_interrupt();
00245       Usb_ack_resume();
00246       Usb_disable_resume_interrupt();
00247       Usb_resume_action();
00248       Usb_send_event(EVT_USB_RESUME);
00249    }
00250   // - USB bus reset detection
00251    if (Is_usb_reset()&& Is_reset_interrupt_enabled())
00252    {
00253       Usb_ack_reset();
00254       usb_init_device();
00255       Usb_reset_action();
00256       Usb_send_event(EVT_USB_RESET);
00257    }
00258 
00259 }

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Variable Documentation

volatile U16 delay_usb

Definition at line 114 of file usb_task.c.

Referenced by usb_delay_ms().


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