usb_task.c File Reference

Copyright (c) 2004 This file manages the USB controller. More...

#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"

Go to the source code of this file.

Functions
void	usb_task_init (void)
	This function initializes the USB the associated variables.
void	usb_start_device (void)
	This function initializes the USB device controller.
void	usb_task (void)
	Entry point of the USB mamnagement.
void	usb_interrupt (void)
	USB interrupt process.
Variables
volatile 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 /.
U8 xdata	sof_counter
volatile U8 data	toggle_next_time
_MEM_TYPE_SLOW_ U8	usb_configuration_nb
volatile bit	usb_continuous_mode
U8	send_free = 0
S_hid_set_control	SetControlBytes

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Detailed Description

Copyright (c) 2004 This file manages the USB controller.

Please read file license.txt for copyright notice.

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:

/

Definition in file usb_task.c.

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Function Documentation

void usb_task_init (  void   )

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) Parameters: none  Returns: none / Definition at line 68 of file usb_task.c. References FALSE, Set_page_usb, sof_counter, toggle_next_time, TRUE, usb_connected, usb_continuous_mode, Usb_enable, and usb_start_device(). { 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; }

void usb_start_device (  void   )

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) Parameters: none  Returns: none / Definition at line 95 of file usb_task.c. References Enable_interrupt, Enable_usb_interrupt, Set_page_usb, U16, Usb_ack_suspend, Usb_attach, Usb_detach, Usb_enable_reset_interrupt, Usb_enable_resume_interrupt, Usb_enable_sof_interrupt, Usb_enable_suspend_interrupt, Usb_enable_wake_up_interrupt, usb_generate_clock(), usb_init_device(), Usb_set_speed, and Usb_unfreeze_clock. Referenced by usb_task_init(). { 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(); }

void usb_task (  void   )

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) Parameters: none  Returns: none this part of the code can be modify following the application end of modification Definition at line 133 of file usb_task.c. References Disable_ale, Enable_interrupt, EP_CONTROL, EP_HID_IN, FALSE, Is_usb_in_ready, Is_usb_receive_setup, Led_all_off, Pll_stop, send_free, Set_page_usb, SetControlBytes, TRUE, S_hid_set_control::type, Usb_ack_in_ready, usb_connected, usb_continuous_mode, usb_process_request(), Usb_select_endpoint, and Usb_suspend_action. { 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 ; } } if(usb_continuous_mode == TRUE) { Usb_select_endpoint(EP_HID_IN); if(Is_usb_in_ready()) { send_free = 1; Usb_ack_in_ready(); } } } }

void usb_interrupt (  void   )

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) Parameters: none  Returns: none Definition at line 199 of file usb_task.c. References Enable_ale, FALSE, Is_usb_reset, Is_usb_sof, Is_usb_suspend, Is_usb_wake_up, Pll_enable, sof_counter, Switch_ale, TRUE, Usb_ack_reset, Usb_ack_sof, Usb_ack_suspend, Usb_ack_wake_up, usb_connected, usb_continuous_mode, Usb_enable_sof_interrupt, Usb_enable_suspend_interrupt, Usb_enable_wake_up_interrupt, usb_enum_var_init(), Usb_freeze_clock, and Usb_unfreeze_clock. { 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; } }

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Variable Documentation

volatile 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 /. Definition at line 42 of file usb_task.c. Referenced by usb_enum_var_init(), usb_interrupt(), usb_task(), and usb_task_init().

U8 xdata sof_counter

Definition at line 43 of file usb_task.c. Referenced by usb_interrupt(), and usb_task_init().

volatile U8 data toggle_next_time

Definition at line 44 of file usb_task.c. Referenced by usb_task_init().

_MEM_TYPE_SLOW_ U8 usb_configuration_nb

Definition at line 46 of file usb_task.c.

volatile bit usb_continuous_mode

Definition at line 48 of file usb_task.c. Referenced by usb_interrupt(), usb_task(), and usb_task_init().

U8 send_free = 0

Definition at line 49 of file usb_task.c. Referenced by usb_task(), usb_user_endpoint_init(), and usb_write_continuous().

S_hid_set_control SetControlBytes

Definition at line 51 of file usb_task.c. Referenced by usb_task(), and usb_user_read_request().

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