usb_task.h File Reference

This file manages the USB task either device/host or both. More...

Go to the source code of this file.

Defines
USB Events
#define	Usb_send_event(x)   (g_usb_event |= (1<<x))
	Send event.
#define	Usb_ack_event(x)   (g_usb_event &= ~(1<<x))
	Ack event processed.
#define	Usb_clear_all_event()   (g_usb_event = 0)
	Clear all events.
#define	Is_usb_event(x)   ((g_usb_event & (1<<x)) ? TRUE : FALSE)
	Check for USB event.
#define	Is_not_usb_event(x)   ((g_usb_event & (1<<x)) ? FALSE: TRUE)
	Check for USB event NOT occuring.
#define	Is_usb_device()   (g_usb_mode==USB_MODE_DEVICE ? TRUE : FALSE)
	Check if USB is device.
#define	EVT_USB_POWERED   1
	USB Event: USB plugged.
#define	EVT_USB_UNPOWERED   2
	USB Event: USB un-plugged.
#define	EVT_USB_DEVICE_FUNCTION   3
	USB Event: USB in device.
#define	EVT_USB_HOST_FUNCTION   4
	USB Event: USB in host.
#define	EVT_USB_SUSPEND   5
	USB Event: USB suspend.
#define	EVT_USB_WAKE_UP   6
	USB Event: USB wake up.
#define	EVT_USB_RESUME   7
	USB Event: USB resume.
#define	EVT_USB_RESET   8
	USB Event: USB reset.
#define	EVT_USB_SETUP_RX   9
	USB Event: USB setup received.
Standard requests defines
#define	GET_STATUS   0x00
#define	GET_DEVICE   0x01
#define	CLEAR_FEATURE   0x01
	see FEATURES below
#define	GET_STRING   0x03
#define	SET_FEATURE   0x03
	see FEATURES below
#define	SET_ADDRESS   0x05
#define	GET_DESCRIPTOR   0x06
#define	SET_DESCRIPTOR   0x07
#define	GET_CONFIGURATION   0x08
#define	SET_CONFIGURATION   0x09
#define	GET_INTERFACE   0x0A
#define	SET_INTERFACE   0x0B
#define	SYNCH_FRAME   0x0C
#define	GET_DEVICE_DESCRIPTOR   1
#define	GET_CONFIGURATION_DESCRIPTOR   4
#define	REQUEST_DEVICE_STATUS   0x80
#define	REQUEST_INTERFACE_STATUS   0x81
#define	REQUEST_ENDPOINT_STATUS   0x82
#define	ZERO_TYPE   0x00
#define	INTERFACE_TYPE   0x01
#define	ENDPOINT_TYPE   0x02
#define	DEVICE_DESCRIPTOR   0x01
#define	CONFIGURATION_DESCRIPTOR   0x02
#define	STRING_DESCRIPTOR   0x03
#define	INTERFACE_DESCRIPTOR   0x04
#define	ENDPOINT_DESCRIPTOR   0x05
#define	DEVICE_QUALIFIER_DESCRIPTOR   0x06
#define	OTHER_SPEED_CONFIGURATION_DESCRIPTOR   0x07
#define	FEATURE_DEVICE_REMOTE_WAKEUP   0x01
#define	FEATURE_ENDPOINT_HALT   0x00
#define	TEST_J   0x01
#define	TEST_K   0x02
#define	TEST_SEO_NAK   0x03
#define	TEST_PACKET   0x04
#define	TEST_FORCE_ENABLE   0x05
#define	BUS_POWERED   0
#define	SELF_POWERED   1
Functions
void	usb_start_device (void)
	This function initializes the USB device controller.
Variables
volatile uint16_t	g_usb_event
	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)

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Detailed Description

This file manages the USB task either device/host or both.

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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

Definition in file usb_task.h.