The UHD driver provides a low-level abstraction of the host controller hardware.

Most events coming from the hardware such as interrupts may cause the UHD performing function call in UHC and UHI.

Modules
	USBC Host Driver

Typedefs
typedef void(*	uhd_callback_reset_t )(void)
	End of reset callback function type. More...

typedef void(*	uhd_callback_setup_end_t )(usb_add_t add, uhd_trans_status_t status, uint16_t payload_trans)
	End of setup callback function type. More...

typedef bool(*	uhd_callback_setup_run_t )(usb_add_t add, uint8_t *payload, uint16_t payload_size)
	Data setup transfer callback function type. More...

typedef void(*	uhd_callback_trans_t )(usb_add_t add, usb_ep_t ep, uhd_trans_status_t status, iram_size_t nb_transfered)
	End of transfer callback function type. More...

Enumerations
enum	uhd_speed_t { UHD_SPEED_LOW = 0, UHD_SPEED_FULL = 1, UHD_SPEED_HIGH = 2 }
	Device speed. More...

enum	uhd_trans_status_t { UHD_TRANS_NOERROR = 0, UHD_TRANS_DISCONNECT, UHD_TRANS_CRC, UHD_TRANS_DT_MISMATCH, UHD_TRANS_STALL, UHD_TRANS_NOTRESPONDING, UHD_TRANS_PIDFAILURE, UHD_TRANS_TIMEOUT, UHD_TRANS_ABORTED }
	Endpoint transfer status The status field is updated after each transaction attempt, whether successful or not. More...

Functions
void	uhd_disable (bool b_id_stop)
	Disables the USB host mode. More...

void	uhd_enable (void)
	Enables the USB host mode Start the ID pin management if the ID pin is available. More...

uint16_t	uhd_get_frame_number (void)
	Returns the current Start Of Frame (SOF) number. More...

uint16_t	uhd_get_microframe_number (void)
	Returns the current micro start of frame number. More...

uhd_speed_t	uhd_get_speed (void)
	Returns the speed of connected device. More...

bool	uhd_is_suspend (void)
	Test if the suspend state is enabled on the USB line. More...

void	uhd_resume (void)
	Enables the IDLE state on the USB line. More...

void	uhd_send_reset (uhd_callback_reset_t callback)
	Enables the Reset state on the USB line. More...

bool	uhd_setup_request (usb_add_t add, usb_setup_req_t req, uint8_t payload, uint16_t payload_size, uhd_callback_setup_run_t callback_run, uhd_callback_setup_end_t callback_end)
	Add a setup request in the control endpoint setup queue. More...

void	uhd_suspend (void)
	Enables the suspend state on the USB line. More...

Endpoint Management
The following functions allow drivers to create and remove endpoints, as well as set, clear and query their "halted" and "wedged" states.
bool	uhd_ep0_alloc (usb_add_t add, uint8_t ep_size)
	Configures and enables a control endpoint 0. More...

bool	uhd_ep_alloc (usb_add_t add, usb_ep_desc_t *ep_desc, uhd_speed_t speed)
	Configures and enables an endpoint. More...

void	uhd_ep_free (usb_add_t add, usb_ep_t endp)
	Disables an endpoint or all endpoint of a device. More...

bool	uhd_ep_run (usb_add_t add, usb_ep_t endp, bool b_shortpacket, uint8_t *buf, iram_size_t buf_size, uint16_t timeout, uhd_callback_trans_t callback)
	Allows to receive or send data on an endpoint. More...

void	uhd_ep_abort (usb_add_t add, usb_ep_t endp)
	Aborts an on-going transfer on an endpoint. More...

High speed test mode management
The following functions allow the host to jump to a specific test mode required in high speed mode.
void	uhd_test_mode_j (void)

void	uhd_test_mode_k (void)

void	uhd_test_mode_se0_nak (void)

void	uhd_test_mode_packet (void)

UHC callbacks to provide for UHD
The following callbacks are used by UHD.
void	uhc_start (void)
	Starts the host mode. More...

void	uhc_stop (bool b_id_stop)
	Stops the host mode. More...

void	uhc_notify_connection (bool b_plug)
	Notify device connection or disconnection. More...

void	uhc_notify_sof (bool b_micro)
	Notify each start of frame sent by driver. More...

void	uhc_notify_resume (void)
	Notify that a resume bus occurs A resume can occur after a downstream or an upstream resume. More...

typedef void(* uhd_callback_reset_t)(void)

End of reset callback function type.

Registered by uhd_send_reset() Callback called when reset event is completed.

typedef void(* uhd_callback_setup_end_t)(usb_add_t add, uhd_trans_status_t status, uint16_t payload_trans)

End of setup callback function type.

Registered by uhd_setup_request() Called when the setup request is completed.

Parameters

add	USB address of the setup request
status	Transfer status
payload_trans	Number of data transfered during DATA phase

typedef bool(* uhd_callback_setup_run_t)(usb_add_t add, uint8_t **payload, uint16_t *payload_size)

Data setup transfer callback function type.

Registered by uhd_setup_request() Called during DATA phase when the (payload) buffer is full or empty. Then the setup request is halted. A new buffer can be provided to continue the DATA phase or abort DATA phase.

Parameters

add	USB address of the setup request
payload	To return the next buffer address
payload_size	To return the size of next buffer

Returns: true, if a new buffer is available, otherwise stop the request.

typedef void(* uhd_callback_trans_t)(usb_add_t add, usb_ep_t ep, uhd_trans_status_t status, iram_size_t nb_transfered)

End of transfer callback function type.

Registered by uhd_ep_run() Callback called by USB interrupt after data transfer or abort (reset,...).

Parameters

add	USB address used by the transfer
status	Transfer status
nb_transfered	Number of data transfered

enum uhd_speed_t

Device speed.

Enumerator
UHD_SPEED_LOW
UHD_SPEED_FULL
UHD_SPEED_HIGH

enum uhd_trans_status_t

Endpoint transfer status The status field is updated after each transaction attempt, whether successful or not.

Enumerator
UHD_TRANS_NOERROR	Transaction is successful.
UHD_TRANS_DISCONNECT	Device is disconnected.
UHD_TRANS_CRC	CRC error in data packet.
UHD_TRANS_DT_MISMATCH	Data toggle PID did not match the expected value.
UHD_TRANS_STALL	The endpoint returned a STALL PID.
UHD_TRANS_NOTRESPONDING	Device did not respond to token (IN) or did not provide a handshake (OUT)
UHD_TRANS_PIDFAILURE	Check bits on PID from endpoint failed.
UHD_TRANS_TIMEOUT	Data transmission not completed before timeout.
UHD_TRANS_ABORTED	Data transmission has been aborted.

void uhc_notify_connection ( bool b_plug )

Notify device connection or disconnection.

Parameters

b_plug Device connection, if true

References uhc_device_t::address, Assert, uhc_connection_tree(), uhc_power_running, and UHC_USB_ADD_NOT_VALID.

Referenced by uhd_disable(), and uhd_interrupt().

void uhc_notify_resume ( void )

Notify that a resume bus occurs A resume can occur after a downstream or an upstream resume.

References uhc_remotewakeup(), and UHC_WAKEUP_EVENT.

Referenced by uhd_sof_interrupt().

void uhc_notify_sof ( bool b_micro )

Notify each start of frame sent by driver.

Parameters

b_micro It is a micro start of frame, if true

References uhi_api_t::sof_notify, UHC_NB_UHI, uhc_sof_timeout, and uhc_sof_timeout_callback.

Referenced by uhd_sof_interrupt().

void uhc_start ( void )

Starts the host mode.

References uhc_device_t::address, uhc_sof_timeout, UHC_USB_ADD_NOT_VALID, and uhd_enable().

Referenced by main(), otg_dual_enable(), and otg_id_handler().

void uhc_stop ( bool b_id_stop )

Stops the host mode.

Parameters

b_id_stop Stop USB ID pin management, if true.

References uhd_disable().

Referenced by otg_id_handler().

void uhd_disable ( bool b_id_stop )

Disables the USB host mode.

Parameters

b_id_stop Stop ID pin management, if true.

References cpu_irq_restore(), cpu_irq_save(), Is_otg_clock_usable, otg_dual_disable(), otg_freeze_clock, otg_unfreeze_clock, pad_vbus_disable, pad_vbus_error_interrupt_disable, pad_vbus_interrupt_disable, uhc_notify_connection(), uhd_disable_all_interrupts, uhd_disable_sof, uhd_sleep_mode(), UHD_STATE_WAIT_ID_HOST, and UNUSED.

Referenced by uhc_stop().

void uhd_enable ( void )

Enables the USB host mode Start the ID pin management if the ID pin is available.

References cpu_irq_restore(), cpu_irq_save(), Is_pad_id_device, Is_pad_vbus_high, otg_dual_enable(), otg_enable, otg_enable_host_mode, otg_freeze_clock, otg_register_desc_tab, otg_unfreeze_clock, pad_vbus_enable, pad_vbus_error_init, pad_vbus_init, UHC_VBUS_CHANGE, uhd_ack_all_interrupts, uhd_b_suspend_requested, uhd_ctrl_request_timeout, uhd_enable_connection_int, uhd_enable_reset_sent_interrupt, uhd_enable_sof_interrupt, uhd_enable_wakeup_interrupt, uhd_g_pipe_table, uhd_resume_start, uhd_sleep_mode(), UHD_STATE_DISCONNECT, UHD_STATE_NO_VBUS, uhd_suspend_start, UHD_USB_INT_LEVEL, uhd_vbus_handler(), and uhd_vbus_is_on.

Referenced by uhc_start().

bool uhd_ep0_alloc	(	usb_add_t	add,
		uint8_t	ep_size
	)

Configures and enables a control endpoint 0.

Parameters

add	USB address of endpoint
ep_size	Endpoint control maximum size

Returns: 1 if the endpoint is enabled, otherwise 0.

References Is_uhd_pipe_enabled, uhd_configure_pipe, uhd_ctrl_buffer, uhd_enable_pipe, uhd_enable_pipe_error_interrupt, uhd_enable_pipe_interrupt, uhd_enable_stall_interrupt, uhd_g_pipe_table, uhd_udesc_set_buf0_addr, and uhd_udesc_set_uhaddr.

Referenced by uhc_enumeration_step11(), uhc_enumeration_step5(), and uhc_enumeration_step9().

void uhd_ep_abort	(	usb_add_t	add,
		usb_ep_t	endp
	)

Aborts an on-going transfer on an endpoint.

If a transfer is on going, then it is stopped and the callback registered is called to signal the end of transfer. Note: The control endpoint is not authorized.

Parameters

add	USB address of endpoint
endp	Endpoint to abort

References uhd_ep_abort_pipe(), uhd_get_pipe(), UHD_PEP_NB, and UHD_TRANS_ABORTED.

bool uhd_ep_alloc	(	usb_add_t	add,
		usb_ep_desc_t *	ep_desc,
		uhd_speed_t	speed
	)

Configures and enables an endpoint.

Parameters

add	USB address of endpoint
ep_desc	Endpoint descriptor
speed	Endpoint working speed

Returns: 1 if the endpoint is enabled, otherwise 0.

References usb_ep_desc_t::bEndpointAddress, usb_ep_desc_t::bInterval, usb_ep_desc_t::bmAttributes, Is_uhd_pipe_enabled, le16_to_cpu, uhd_ack_out_ready, UHD_BULK_INTERVAL_MIN, uhd_configure_pipe, uhd_enable_pipe, uhd_enable_pipe_error_interrupt, uhd_enable_pipe_interrupt, uhd_enable_stall_interrupt, uhd_g_pipe_table, UHD_PEP_NB, uhd_udesc_set_uhaddr, USB_EP_ADDR_MASK, USB_EP_DIR_IN, USB_EP_TYPE_BULK, USB_EP_TYPE_MASK, and usb_ep_desc_t::wMaxPacketSize.

void uhd_ep_free	(	usb_add_t	add,
		usb_ep_t	endp
	)

Disables an endpoint or all endpoint of a device.

Parameters

add	USB address of endpoint
endp	Endpoint number and direction (USB_EP_DIR_IN/OUT). Remove all endpoints of USB address, if 0xFF.

References uhd_ctrl_request_t::add, uhd_ctrl_request_end(), uhd_ctrl_request_timeout, uhd_disable_pipe, uhd_get_pipe_endpoint_address, UHD_PEP_NB, uhd_pipe_finish_job(), uhd_pipes_error, UHD_TRANS_DISCONNECT, uhd_udesc_get_epnum, and uhd_udesc_get_uhaddr.

Referenced by uhc_connection_tree(), uhc_enumeration_error(), uhc_enumeration_step11(), uhc_enumeration_step14(), uhc_enumeration_step5(), and uhc_enumeration_step9().

bool uhd_ep_run	(	usb_add_t	add,
		usb_ep_t	endp,
		bool	b_shortpacket,
		uint8_t *	buf,
		iram_size_t	buf_size,
		uint16_t	timeout,
		uhd_callback_trans_t	callback
	)

Allows to receive or send data on an endpoint.

If a USB DMA is available, the driver uses it to transfer endpoint data from or to internal RAM. When the transfer is finished or aborted (stall, reset, ...), the callback is called. This callback returns the transfer status and eventually the number of byte transfered. Note: The control endpoint is not authorized.

Parameters

add	USB address of endpoint
endp	Endpoint number
b_shortpacket	Enabled automatic short packet
buf	Buffer on Internal RAM to send or fill. It must be align, then use COMPILER_WORD_ALIGNED.
buf_size	Buffer size to send or fill
timeout	Transfer timeout (ms)
callback	NULL or function to call at the end of transfer

Warning: About b_shortpacket, for OUT endpoint it means that a short packet or a Zero Length Packet (ZLP) must be sent to the USB line to properly close the USB transfer at the end of the data transfer. For Bulk and Interrupt IN endpoint, it will automatically stop the transfer at the end of the data transfer (received short packet).; About buf_size, for OUT endpoint the data is sent packet by packet until size is achieved. If the size is multiple of endpoint size ZLP may be sent according to the b_shortpacket setting. For IN endpoint the data is received packet by packet, if the last packet exceeds the buffer size, the overflow data will be discarded. So for IN endpoint it's better to allocate buffer size aligned to endpoint size so no returned data is lost.; About timeout, for BULK endpoint with timeout set to zero, it means that the transfer will never be stopped before transfer done. Since most of USB embedded peripherals do not manage the transfer bandwidth by peripheral hardware, such a BULK transfer will occupy all USB non-periodic transfer bandwidth. In this case, other BULK transfers started later will be pending until this transfer is done and bandwidth released. So it is better to use BULK transfers with none zero timeout.

Returns: 1 if function was successfully done, otherwise 0.

References uhd_pipe_job_t::b_shortpacket, uhd_pipe_job_t::buf, uhd_pipe_job_t::buf_size, uhd_pipe_job_t::busy, uhd_pipe_job_t::call_end, cpu_irq_restore(), cpu_irq_save(), uhd_pipe_job_t::nb_trans, uhd_pipe_job_t::timeout, uhd_get_pipe(), UHD_PEP_NB, uhd_pipe_trans_complet(), uhd_udesc_rst_buf0_ctn, and uhd_udesc_rst_buf0_size.

Referenced by uhi_msc_transfer().

uint16_t uhd_get_frame_number ( void )

Returns the current Start Of Frame (SOF) number.

Returns: current start of frame number.

References uhd_get_sof_number.

uint16_t uhd_get_microframe_number ( void )

Returns the current micro start of frame number.

Returns: current micro start of frame number required in high speed mode.

References uhd_get_microsof_number.

uhd_speed_t uhd_get_speed ( void )

Returns the speed of connected device.

Returns: Device speed

References Assert, uhd_get_speed_mode, UHD_SPEED_FULL, and UHD_SPEED_LOW.

Referenced by uhc_enumeration_step4().

bool uhd_is_suspend ( void )

Test if the suspend state is enabled on the USB line.

Returns: USB line in SUSPEND state, if true

References Is_uhd_sof_enabled.

Referenced by uhc_is_suspend().

void uhd_resume ( void )

Enables the IDLE state on the USB line.

The IDLE state is enable when SOF are present on USB line. A Downstream Resume signal can be sent.

References Is_otg_clock_usable, Is_uhd_sof_enabled, otg_unfreeze_clock, uhd_enable_sof, uhd_resume_start, uhd_send_resume, uhd_sleep_mode(), UHD_STATE_IDLE, and uhd_suspend_start.

Referenced by uhc_resume().

void uhd_send_reset ( uhd_callback_reset_t callback )

Enables the Reset state on the USB line.

Parameters

callback Callback when reset sequence is finished

References uhd_reset_callback, and uhd_start_reset.

Referenced by uhc_enumeration_reset().

bool uhd_setup_request	(	usb_add_t	add,
		usb_setup_req_t *	req,
		uint8_t *	payload,
		uint16_t	payload_size,
		uhd_callback_setup_run_t	callback_run,
		uhd_callback_setup_end_t	callback_end
	)

Add a setup request in the control endpoint setup queue.

Note: Request timeout is 5s.

Parameters

add	USB address of control endpoint
req	Setup request definition
payload	Buffer to use in setup DATA phase
payload_size	Size of buffer used in DATA phase
callback_run	Callback to call if buffer is empty or full
callback_end	Callback to call when request is finish