Generic USB Drivers More...

Functions
usbd_device *	usbd_init (const usbd_driver driver, const struct usb_device_descriptor dev, const struct usb_config_descriptor conf, const char const strings, int num_strings, uint8_t control_buffer, uint16_t control_buffer_size)
	Main initialization entry point. More...

void	usbd_register_reset_callback (usbd_device usbd_dev, void(callback)(void))
	Registers a reset callback. More...

void	usbd_register_suspend_callback (usbd_device usbd_dev, void(callback)(void))
	Registers a suspend callback. More...

void	usbd_register_resume_callback (usbd_device usbd_dev, void(callback)(void))
	Registers a resume callback. More...

void	usbd_register_sof_callback (usbd_device usbd_dev, void(callback)(void))
	Registers a SOF callback. More...

void	usbd_register_extra_string (usbd_device usbd_dev, int index, const char string)
	Registers a non-contiguous string descriptor. More...

void	_usbd_reset (usbd_device *usbd_dev)

void	usbd_poll (usbd_device *usbd_dev)

void	usbd_disconnect (usbd_device *usbd_dev, bool disconnected)
	Disconnect, if supported by the driver. More...

void	usbd_ep_setup (usbd_device *usbd_dev, uint8_t addr, uint8_t type, uint16_t max_size, usbd_endpoint_callback callback)
	Setup an endpoint. More...

uint16_t	usbd_ep_write_packet (usbd_device usbd_dev, uint8_t addr, const void buf, uint16_t len)
	Write a packet. More...

uint16_t	usbd_ep_read_packet (usbd_device usbd_dev, uint8_t addr, void buf, uint16_t len)
	Read a packet. More...

void	usbd_ep_stall_set (usbd_device *usbd_dev, uint8_t addr, uint8_t stall)
	Set/clear STALL condition on an endpoint. More...

uint8_t	usbd_ep_stall_get (usbd_device *usbd_dev, uint8_t addr)
	Get STALL status of an endpoint. More...

void	usbd_ep_nak_set (usbd_device *usbd_dev, uint8_t addr, uint8_t nak)
	Set an Out endpoint to NAK. More...

Detailed Description

Generic USB Drivers

Version: 1.0.0

Author: © 2010 Gareth McMullin garet.nosp@m.h@bl.nosp@m.acksp.nosp@m.here.nosp@m..co.n.nosp@m.z

Date: 10 March 2013

LGPL License Terms libopencm3 License

Function Documentation

◆ _usbd_reset()

void _usbd_reset ( usbd_device * usbd_dev )

Definition at line 113 of file usb.c.

References USB_ENDPOINT_ATTR_CONTROL, and usbd_ep_setup().

Referenced by st_usbfs_poll().

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◆ usbd_disconnect()

void usbd_disconnect	(	usbd_device *	usbd_dev,
		bool	disconnected
	)

Disconnect, if supported by the driver.

This function is implemented as weak function and can be replaced by an application specific version to handle chips that don't have built-in handling for this (e.g. STM32F1.)

Parameters

usbd_dev	the usb device handle returned from usbd_init
disconnected	true to request a disconnect

Definition at line 131 of file usb.c.

◆ usbd_ep_nak_set()

void usbd_ep_nak_set	(	usbd_device *	usbd_dev,
		uint8_t	addr,
		uint8_t	nak
	)

Set an Out endpoint to NAK.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	EP address
nak	if nonzero, set NAK

Definition at line 168 of file usb.c.

Referenced by _usbd_control_in(), _usbd_control_setup(), and usb_control_setup_write().

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◆ usbd_ep_read_packet()

uint16_t usbd_ep_read_packet	(	usbd_device *	usbd_dev,
		uint8_t	addr,
		void *	buf,
		uint16_t	len
	)

Read a packet.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	EP address
buf	user buffer that will receive data
len	# of bytes

Returns: Actual # of bytes read

Definition at line 152 of file usb.c.

Referenced by _usbd_control_out(), msc_data_rx_cb(), and usb_control_recv_chunk().

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◆ usbd_ep_setup()

void usbd_ep_setup	(	usbd_device *	usbd_dev,
		uint8_t	addr,
		uint8_t	type,
		uint16_t	max_size,
		usbd_endpoint_callback	callback
	)

Setup an endpoint.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	Full EP address including direction (e.g. 0x01 or 0x81)
type	Value for bmAttributes (USB_ENDPOINT_ATTR_*)
max_size	Endpoint max size
callback	your desired callback function

Note: The stack only supports 8 endpoints, 0..7, so don't try and use arbitrary addresses here, even though USB itself would allow this. Not all backends support arbitrary addressing anyway.

Definition at line 140 of file usb.c.

Referenced by _usbd_reset(), and msc_set_config().

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◆ usbd_ep_stall_get()

uint8_t usbd_ep_stall_get	(	usbd_device *	usbd_dev,
		uint8_t	addr
	)

Get STALL status of an endpoint.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	Full EP address (with direction bit)

Returns: nonzero if endpoint is stalled

Definition at line 163 of file usb.c.

Referenced by usb_standard_endpoint_get_status().

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◆ usbd_ep_stall_set()

void usbd_ep_stall_set	(	usbd_device *	usbd_dev,
		uint8_t	addr,
		uint8_t	stall
	)

Set/clear STALL condition on an endpoint.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	Full EP address (with direction bit)
stall	if 0, clear STALL, else set stall.

Definition at line 158 of file usb.c.

Referenced by stall_transaction(), usb_standard_endpoint_stall(), and usb_standard_endpoint_unstall().

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◆ usbd_ep_write_packet()

uint16_t usbd_ep_write_packet	(	usbd_device *	usbd_dev,
		uint8_t	addr,
		const void *	buf,
		uint16_t	len
	)

Write a packet.

Parameters

usbd_dev	the usb device handle returned from usbd_init
addr	EP address (direction is ignored)
buf	pointer to user data to write
len	# of bytes

Returns: 0 if failed, len if successful

Definition at line 146 of file usb.c.

Referenced by _usbd_control_out(), msc_data_rx_cb(), msc_data_tx_cb(), usb_control_send_chunk(), and usb_control_setup_read().

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◆ usbd_init()

usbd_device * usbd_init	(	const usbd_driver *	driver,
		const struct usb_device_descriptor *	dev,
		const struct usb_config_descriptor *	conf,
		const char const	strings,
		int	num_strings,
		uint8_t *	control_buffer,
		uint16_t	control_buffer_size
	)

Main initialization entry point.

Initialize the USB firmware library to implement the USB device described by the descriptors provided.

It is required that the 48MHz USB clock is already available.

Parameters

driver	TODO
dev	Pointer to USB device descriptor. This must not be changed while the device is in use.
conf	Pointer to array of USB configuration descriptors. These must not be changed while the device is in use. The length of this array is determined by the bNumConfigurations field in the device descriptor.
strings	Pointer to an array of strings for USB string descriptors. Referenced in iSomething fields, e.g. iManufacturer. Since a zero index means "no string", an iSomething value of 1 refers strings[0].
num_strings	Number of items in strings array.
control_buffer	Pointer to array that would hold the data received during control requests with DATA stage
control_buffer_size	Size of control_buffer

Returns: the usb device initialized for use. (currently cannot fail).

To place strings entirely into Flash/read-only memory, use

static const * const strings[] = { ... };

(note the double const.) The first const refers to the strings while the second const refers to the array.

Definition at line 42 of file usb.c.

References _usbd_control_in(), _usbd_control_out(), and _usbd_control_setup().

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◆ usbd_poll()

void usbd_poll ( usbd_device * usbd_dev )

Definition at line 126 of file usb.c.

◆ usbd_register_extra_string()

void usbd_register_extra_string	(	usbd_device *	usbd_dev,
		int	index,
		const char *	string
	)

Registers a non-contiguous string descriptor.

Definition at line 99 of file usb.c.

◆ usbd_register_reset_callback()

void usbd_register_reset_callback	(	usbd_device *	usbd_dev,
		void(*)(void)	callback
	)

Registers a reset callback.

Definition at line 77 of file usb.c.

◆ usbd_register_resume_callback()

void usbd_register_resume_callback	(	usbd_device *	usbd_dev,
		void(*)(void)	callback
	)

Registers a resume callback.

Definition at line 88 of file usb.c.

◆ usbd_register_sof_callback()

void usbd_register_sof_callback	(	usbd_device *	usbd_dev,
		void(*)(void)	callback
	)

Registers a SOF callback.

Definition at line 94 of file usb.c.

◆ usbd_register_suspend_callback()

void usbd_register_suspend_callback	(	usbd_device *	usbd_dev,
		void(*)(void)	callback
	)

Registers a suspend callback.

Definition at line 82 of file usb.c.

Functions

Detailed Description

Function Documentation

◆ _usbd_reset()

◆ usbd_disconnect()

◆ usbd_ep_nak_set()

◆ usbd_ep_read_packet()

◆ usbd_ep_setup()

◆ usbd_ep_stall_get()

◆ usbd_ep_stall_set()

◆ usbd_ep_write_packet()

◆ usbd_init()

◆ usbd_poll()

◆ usbd_register_extra_string()

◆ usbd_register_reset_callback()

◆ usbd_register_resume_callback()

◆ usbd_register_sof_callback()

◆ usbd_register_suspend_callback()