USB dual role driver

USB low-level driver for dual role features.

Functions
void	usb_dual_disable (void)
	Deinitialize the dual role driver. More...
bool	usb_dual_enable (void)
	Initialize the USB peripheral and set right role according to ID pin. More...

USB ID pin management
The ID pin come from the USB connector (A and B receptable) and allows to select the USB mode between host or device. The ID pin can be managed through EIC pin. This feature is optional, and it is enabled if USB_ID_PIN is defined in board.h and CONF_BOARD_USB_ID_DETECT defined in conf_board.h.
#define	USB_ID_DETECT   (defined(CONF_BOARD_USB_ID_DETECT))
#define	USB_ID_EIC   (defined(USB_ID_PIN) && USB_ID_DETECT)

USB Vbus management
The VBus line can be monitored through a EIC pin and a basic resistor voltage divider. This feature is optional, and it is enabled if USB_VBUS_PIN is defined in board.h and CONF_BOARD_USB_VBUS_DETECT defined in conf_board.h.
#define	USB_VBUS_DETECT   (defined(CONF_BOARD_USB_VBUS_DETECT))
#define	USB_VBUS_EIC   (defined(USB_VBUS_PIN) && USB_VBUS_DETECT)

#define USB_ID_DETECT   (defined(CONF_BOARD_USB_ID_DETECT))

#define USB_ID_EIC   (defined(USB_ID_PIN) && USB_ID_DETECT)

#define USB_VBUS_DETECT   (defined(CONF_BOARD_USB_VBUS_DETECT))

#define USB_VBUS_EIC   (defined(USB_VBUS_PIN) && USB_VBUS_DETECT)

void usb_dual_disable

(

void

)

Deinitialize the dual role driver.

References _initialized, EXTINT_CALLBACK_TYPE_DETECT, extint_chan_disable_callback(), and USB_ID_EIC_LINE.

Referenced by uhd_disable().

bool usb_dual_enable

(

void

)

Initialize the USB peripheral and set right role according to ID pin.

Returns

true if the ID pin management has been started, otherwise false.

References _initialized, _usb_is_id_device, port_config::direction, port_config::input_pull, port_get_config_defaults(), PORT_PIN_DIR_INPUT, PORT_PIN_PULL_UP, port_pin_set_config(), udc_start, UHC_MODE_CHANGE, uhc_start(), and USB_ID_PIN.

Referenced by uhd_enable().