USBC Host Driver

USB dual role configuration

The defines UHD_ENABLE and UDD_ENABLE must be added in project to allow the USB low level (UHD) to manage or not the dual role (device and host).

USBC Custom configuration

The following USBC driver configuration must be defined in conf_usb_host.h file of the application.

UHD_USB_INT_LEVEL
Option to change the interrupt priority (0 to 15) by default 5 (recommended).

UHD_USB_INT_FUN
Option to fit interrupt function to what defined in exception table.

UHD_BULK_INTERVAL_MIN
Feature to reduce or increase bulk token rate when it's NAKed (0, 1 ...). To adjust bandwidth usage. Default value 1.

UHD_NO_SLEEP_MGR
Feature to work without sleep manager module. Default not defined. Note that with this feature defined sleep manager must not be used in application.

management

The USB driver is fully managed by interrupt and does not request periodic task. Thereby, the USB events use callbacks to transfer the information. The callbacks can be declared in static during compilation or dynamically during code execution.

mode management

The driver uses the sleepmgr service to manage the different sleep modes. The sleep mode depends on USB driver state (uhd_usbc_state_enum).

Data Structures
struct	uhd_ctrl_request_t
	Structure to store the high level setup request. More...
struct	uhd_pipe_job_t
	Structure definition to store registered jobs on a pipe. More...

Functions
	ISR (UHD_USB_INT_FUN)
	Function called by USBC interrupt handler to manage USB interrupts. More...
void	otg_dual_disable (void)
	Uninitialize the dual role This function is implemented in usbc_host.c file. More...
bool	otg_dual_enable (void)
	Initialize the dual role This function is implemented in usbc_host.c file. More...
static void	uhd_ctrl_interrupt (void)
	Manages the events related to control endpoint. More...
static void	uhd_ctrl_phase_data_in (void)
	Manages the DATA IN phase on control endpoint. More...
static void	uhd_ctrl_phase_data_in_start (void)
	Starts the DATA IN phase on control endpoint. More...
static void	uhd_ctrl_phase_data_out (void)
	Manages the DATA OUT phase on control endpoint. More...
static void	uhd_ctrl_phase_setup (void)
	Sends a USB setup packet to start a control request sequence. More...
static void	uhd_ctrl_phase_zlp_in (void)
	Starts the ZLP IN phase on control endpoint. More...
static void	uhd_ctrl_phase_zlp_out (void)
	Starts the ZLP OUT phase on control endpoint. More...
static void	uhd_ctrl_request_end (uhd_trans_status_t status)
	Call the callback linked to control request and start the next request from the queue. More...
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...
bool	uhd_ep0_alloc (usb_add_t add, uint8_t ep_size)
	Configures and enables a control endpoint 0. More...
void	uhd_ep_abort (usb_add_t add, usb_ep_t endp)
	Aborts an on-going transfer on an endpoint. More...
static void	uhd_ep_abort_pipe (uint8_t pipe, uhd_trans_status_t status)
	Aborts the on-going transfer on a pipe. 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...
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...
static uint8_t	uhd_get_pipe (usb_add_t add, usb_ep_t endp)
	Returns the pipe number matching a USB endpoint. More...
uhd_speed_t	uhd_get_speed (void)
	Returns the speed of connected device. More...
static void	uhd_interrupt (void)
	Function called by USBC interrupt to manage USB host interrupts. More...
bool	uhd_is_suspend (void)
	Test if the suspend state is enabled on the USB line. More...
static void	uhd_pipe_finish_job (uint8_t pipe, uhd_trans_status_t status)
	Call the callback linked to the end of pipe transfer. More...
static uhd_trans_status_t	uhd_pipe_get_error (uint8_t pipe)
	Translates the USBC pipe error to UHD error. More...
static void	uhd_pipe_interrupt (uint8_t pipe)
	Manages the following pipe interrupts: More...
static void	uhd_pipe_trans_complet (uint8_t pipe)
	Computes and starts the next transfer on a pipe. 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...
static void	uhd_sof_interrupt (void)
	Manages timeouts and actions based on SOF events. More...
void	uhd_suspend (void)
	Enables the suspend state on the USB line. More...

Power management
enum	uhd_usbc_state_enum {   UHD_STATE_OFF = 0,   UHD_STATE_WAIT_ID_HOST = 1,   UHD_STATE_NO_VBUS = 2,   UHD_STATE_DISCONNECT = 3,   UHD_STATE_SUSPEND = 4,   UHD_STATE_IDLE = 5 }
	States of USBC interface. More...
static void	uhd_sleep_mode (enum uhd_usbc_state_enum new_state)
	Manages the sleep mode following the USBC state. More...
static volatile uhd_desc_table_t	uhd_g_pipe_table [UHD_PEP_NB]
	USB SRAM data containing pipe descriptor table The content of the USB SRAM can be : More...
static bool	otg_initialized = false
	State of USBC OTG initialization. More...
static uhd_callback_reset_t	uhd_reset_callback = NULL
	Store the callback to be call at the end of reset signal. More...

Control endpoint low level management routine.
This function performs control endpoint management. It handles the SETUP/DATA/HANDSHAKE phases of a control transaction.
enum	uhd_ctrl_request_phase_t {   UHD_CTRL_REQ_PHASE_SETUP = 0,   UHD_CTRL_REQ_PHASE_DATA_OUT = 1,   UHD_CTRL_REQ_PHASE_DATA_IN = 2,   UHD_CTRL_REQ_PHASE_ZLP_IN = 3,   UHD_CTRL_REQ_PHASE_ZLP_OUT = 4 }
	Bit definitions to store setup request state machine. More...
uint32_t	uhd_ctrl_buffer [64/4]
	Buffer to store the sent/received data on control endpoint. More...
static bool	uhd_b_zlp_out_delayed = false
	Flag to delay a ZLP OUT on control endpoint. More...
struct uhd_ctrl_request_t *	uhd_ctrl_request_first
	Entry points of setup request list. More...
struct uhd_ctrl_request_t *	uhd_ctrl_request_last
volatile uint16_t	uhd_ctrl_request_timeout
	Remaining time for on-going setup request (No request on-going if equal 0) More...
uint16_t	uhd_ctrl_nb_trans
	Number of transfered byte on DATA phase of current setup request. More...
static bool	uhd_b_suspend_requested
	Flag to delay a suspend request after all on-going setup request. More...
uhd_ctrl_request_phase_t	uhd_ctrl_request_phase

Management of bulk/interrupt/isochronous endpoints
The UHD manages the data transfer on endpoints: Start data transfer on endpoint with USB DMA Send a ZLP packet if requested Call registered callback to signal end of transfer The transfer abort and stall feature are supported.
static uhd_pipe_job_t	uhd_pipe_job [UHD_PEP_NB-1]
	Array to register a job on bulk/interrupt/isochronous endpoint. More...
static uint8_t	uhd_suspend_start
	Variables to manage the suspend/resume sequence. More...
static uint8_t	uhd_resume_start
static uint8_t	uhd_pipes_unfreeze
static uint8_t	uhd_pipes_error
	Variable to manage error on pipes. More...

enum uhd_ctrl_request_phase_t

Bit definitions to store setup request state machine.

Enumerator
UHD_CTRL_REQ_PHASE_SETUP	Wait a SETUP packet.
UHD_CTRL_REQ_PHASE_DATA_OUT	Wait a OUT data packet.
UHD_CTRL_REQ_PHASE_DATA_IN	Wait a IN data packet.
UHD_CTRL_REQ_PHASE_ZLP_IN	Wait a IN ZLP packet.
UHD_CTRL_REQ_PHASE_ZLP_OUT	Wait a OUT ZLP packet.

enum uhd_usbc_state_enum

States of USBC interface.

Enumerator
UHD_STATE_OFF
UHD_STATE_WAIT_ID_HOST
UHD_STATE_NO_VBUS
UHD_STATE_DISCONNECT
UHD_STATE_SUSPEND
UHD_STATE_IDLE

ISR

(

UHD_USB_INT_FUN

)

Function called by USBC interrupt handler to manage USB interrupts.

It manages the interrupt redirection between host or device interrupt. It answers to OTG events (ID pin change).

Note: Here, the global interrupt mask is not cleared when an USB interrupt is enabled because this one can not occurred during the USB ISR (=during INTX is masked). See Technical reference $3.8.3 Masking interrupt requests in peripheral modules.

References Is_otg_device_mode_enabled, otg_data_memory_barrier, udd_interrupt, and uhd_interrupt().

void otg_dual_disable

(

void

)

Uninitialize the dual role This function is implemented in usbc_host.c file.

References eic_disable(), otg_disable, otg_initialized, otg_unfreeze_clock, pad_id_interrupt_disable, sysclk_disable_usb(), uhd_sleep_mode(), UHD_STATE_OFF, and usbc_async_wake_up_disable().

Referenced by uhd_disable().

bool otg_dual_enable

(

void

)

Initialize the dual role This function is implemented in usbc_host.c file.

Returns

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

References eic_enable(), Is_pad_id_device, otg_enable_device_mode, otg_enable_host_mode, otg_initialized, pad_id_init, sysclk_enable_usb(), udc_start, UHC_MODE_CHANGE, uhc_start(), uhd_sleep_mode(), UHD_STATE_OFF, UHD_STATE_WAIT_ID_HOST, UHD_USB_INT_LEVEL, and usbc_async_wake_up_enable().

Referenced by uhd_enable().

static void uhd_ctrl_interrupt ( void  )

static

Manages the events related to control endpoint.

References Assert, usb_setup_req_t::bmRequestType, dbgp_ctrl, Is_uhd_in_received, Is_uhd_out_ready, Is_uhd_pipe_error, Is_uhd_pipe_frozen, Is_uhd_setup_ready, Is_uhd_stall, uhd_ctrl_request_t::req, uhd_ack_in_received, uhd_ack_out_ready, uhd_ack_pipe_error, uhd_ack_setup_ready, uhd_ack_stall, uhd_ctrl_phase_data_in(), uhd_ctrl_phase_data_in_start(), uhd_ctrl_phase_data_out(), uhd_ctrl_phase_zlp_in(), UHD_CTRL_REQ_PHASE_DATA_IN, UHD_CTRL_REQ_PHASE_DATA_OUT, UHD_CTRL_REQ_PHASE_SETUP, UHD_CTRL_REQ_PHASE_ZLP_IN, UHD_CTRL_REQ_PHASE_ZLP_OUT, uhd_ctrl_request_end(), uhd_freeze_pipe, uhd_pipe_get_error(), UHD_TRANS_NOERROR, UHD_TRANS_STALL, USB_REQ_DIR_IN, USB_REQ_DIR_MASK, and usb_setup_req_t::wLength.

Referenced by uhd_interrupt().

static void uhd_ctrl_phase_data_in ( void  )

static

Manages the DATA IN phase on control endpoint.

In HUB mode, the control pipe is always configured to 64B thus the short packet flag must be computed

References uhd_ctrl_request_t::callback_run, uhd_ctrl_request_t::payload, uhd_ctrl_request_t::payload_size, uhd_ctrl_request_t::req, uhd_ack_fifocon, uhd_ctrl_buffer, uhd_ctrl_phase_zlp_out(), uhd_enable_in_received_interrupt, uhd_get_pipe_size, uhd_in_request_number, uhd_udesc_get_buf0_ctn, uhd_udesc_get_uhaddr, uhd_udesc_rst_buf0_ctn, uhd_udesc_set_buf0_size, uhd_unfreeze_pipe, and usb_setup_req_t::wLength.

Referenced by uhd_ctrl_interrupt().

static void uhd_ctrl_phase_data_in_start ( void  )

static

Starts the DATA IN phase on control endpoint.

References uhd_ack_fifocon, uhd_ack_in_received, uhd_configure_pipe_token, UHD_CTRL_REQ_PHASE_DATA_IN, uhd_enable_in_received_interrupt, uhd_get_pipe_size, uhd_in_request_number, uhd_udesc_rst_buf0_ctn, uhd_udesc_set_buf0_size, and uhd_unfreeze_pipe.

Referenced by uhd_ctrl_interrupt().

static void uhd_ctrl_phase_data_out ( void  )

static

Manages the DATA OUT phase on control endpoint.

References uhd_ctrl_request_t::callback_run, uhd_ctrl_request_t::payload, uhd_ctrl_request_t::payload_size, uhd_ctrl_request_t::req, uhd_ack_fifocon, uhd_ack_out_ready, uhd_configure_pipe_token, uhd_ctrl_buffer, uhd_ctrl_phase_zlp_in(), UHD_CTRL_REQ_PHASE_DATA_OUT, uhd_enable_out_ready_interrupt, uhd_get_pipe_size, uhd_udesc_get_uhaddr, uhd_udesc_rst_buf0_size, uhd_udesc_set_buf0_ctn, uhd_unfreeze_pipe, and usb_setup_req_t::wLength.

Referenced by uhd_ctrl_interrupt().

static void uhd_ctrl_phase_setup ( void  )

static

Sends a USB setup packet to start a control request sequence.

References uhd_ctrl_request_t::add, cpu_to_le16, Is_uhd_pipe_enabled, uhd_ctrl_request_t::req, uhd_ack_fifocon, uhd_ack_setup_ready, uhd_configure_pipe_token, uhd_ctrl_buffer, UHD_CTRL_REQ_PHASE_SETUP, uhd_ctrl_request_end(), uhd_enable_setup_ready_interrupt, UHD_TRANS_DISCONNECT, uhd_udesc_get_uhaddr, uhd_udesc_rst_buf0_size, uhd_udesc_set_buf0_ctn, uhd_udesc_set_uhaddr, uhd_unfreeze_pipe, usb_setup_req_t::wIndex, usb_setup_req_t::wLength, and usb_setup_req_t::wValue.

Referenced by uhd_ctrl_request_end(), and uhd_setup_request().

static void uhd_ctrl_phase_zlp_in ( void  )

static

Starts the ZLP IN phase on control endpoint.

References uhd_ack_fifocon, uhd_ack_in_received, uhd_configure_pipe_token, UHD_CTRL_REQ_PHASE_ZLP_IN, uhd_enable_in_received_interrupt, uhd_in_request_number, uhd_udesc_rst_buf0_ctn, uhd_udesc_set_buf0_size, and uhd_unfreeze_pipe.

Referenced by uhd_ctrl_interrupt(), and uhd_ctrl_phase_data_out().

static void uhd_ctrl_phase_zlp_out ( void  )

static

Starts the ZLP OUT phase on control endpoint.

References uhd_ack_fifocon, uhd_ack_out_ready, uhd_configure_pipe_token, UHD_CTRL_REQ_PHASE_ZLP_OUT, uhd_udesc_rst_buf0_size, and uhd_udesc_set_buf0_ctn.

Referenced by uhd_ctrl_phase_data_in().

static void uhd_ctrl_request_end ( uhd_trans_status_t  status )

static

Call the callback linked to control request and start the next request from the queue.

References Assert, uhd_ctrl_request_t::callback_end, cpu_irq_restore(), cpu_irq_save(), dbgp_ctrl, uhd_ctrl_request_t::next_request, uhd_ctrl_phase_setup(), uhd_ctrl_request_first, uhd_suspend(), and uhd_udesc_get_uhaddr.

Referenced by uhd_ctrl_interrupt(), uhd_ctrl_phase_setup(), uhd_ep_free(), and uhd_sof_interrupt().

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_enable_connection_int, uhd_enable_reset_sent_interrupt, uhd_enable_sof_interrupt, uhd_enable_wakeup_interrupt, uhd_g_pipe_table, uhd_sleep_mode(), UHD_STATE_DISCONNECT, UHD_STATE_NO_VBUS, UHD_USB_INT_LEVEL, 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.

static void uhd_ep_abort_pipe ( uint8_t  pipe, uhd_trans_status_t  status  )

static

Aborts the on-going transfer on a pipe.

Parameters

pipe	Pipe number
status	Reason of abort

References uhd_pipe_job_t::nb_trans, uhd_data_toggle, uhd_disable_pipe, uhd_enable_pipe, uhd_enable_pipe_error_interrupt, uhd_enable_stall_interrupt, uhd_freeze_pipe, uhd_is_pipe_out, uhd_pipe_finish_job(), uhd_set_data_toggle, UHD_TRANS_TIMEOUT, uhd_udesc_get_buf0_ctn, uhd_udesc_get_buf0_size, and USBC_ARRAY.

Referenced by uhd_ep_abort(), uhd_pipe_interrupt(), and uhd_sof_interrupt().

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.

Referenced by uhi_hid_mouse_install().

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_disable_pipe, uhd_get_pipe_endpoint_address, UHD_PEP_NB, uhd_pipe_finish_job(), 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_hid_mouse_start_trans_report().

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.

static uint8_t uhd_get_pipe ( usb_add_t  add, usb_ep_t  endp  )

static

Returns the pipe number matching a USB endpoint.

Parameters

add	USB address
endp	Endpoint number

Returns

Pipe number

References Is_uhd_pipe_enabled, uhd_get_pipe_endpoint_address, and uhd_udesc_get_uhaddr.

Referenced by uhd_ep_abort(), and uhd_ep_run().

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().

static void uhd_interrupt ( void  )

static

Function called by USBC interrupt to manage USB host interrupts.

USB host interrupt events are split into four sections:

• USB line events (VBus error, device dis/connection, SOF, reset, suspend, resume, wakeup)
• control endpoint events (setup reception, end of data transfer, underflow, overflow, stall, error)
• bulk/interrupt/isochronous endpoints events (end of data transfer, stall, error)

References Assert, dbg_print, Is_otg_clock_usable, Is_uhd_connection, Is_uhd_connection_int_enabled, Is_uhd_disconnection, Is_uhd_disconnection_int_enabled, Is_uhd_downstream_resume, Is_uhd_high_speed_mode, Is_uhd_low_speed_mode, Is_uhd_reset_sent, Is_uhd_sof, Is_uhd_upstream_resume, Is_uhd_wakeup, Is_uhd_wakeup_interrupt_enabled, otg_freeze_clock, otg_unfreeze_clock, uhc_notify_connection(), uhd_ack_connection, uhd_ack_disconnection, uhd_ack_reset_sent, uhd_ack_sof, uhd_ack_wakeup, uhd_ctrl_interrupt(), uhd_disable_connection_int, uhd_disable_disconnection_int, uhd_disable_wakeup_interrupt, uhd_disable_wakeup_interrupts, uhd_enable_connection_int, uhd_enable_disconnection_int, uhd_enable_sof, uhd_enable_wakeup_interrupt, uhd_get_interrupt_pipe_number, UHD_PEP_NB, uhd_pipe_interrupt(), uhd_reset_callback, uhd_send_resume, uhd_sleep_mode(), uhd_sof_interrupt(), UHD_STATE_DISCONNECT, UHD_STATE_IDLE, and uhd_stop_reset.

Referenced by ISR().

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().

static void uhd_pipe_finish_job ( uint8_t  pipe, uhd_trans_status_t  status  )

static

Call the callback linked to the end of pipe transfer.

Parameters

pipe	Pipe number
status	Status of the transfer

References uhd_pipe_job_t::buf_internal, uhd_pipe_job_t::busy, uhd_pipe_job_t::call_end, dbgp_ep, uhd_pipe_job_t::nb_trans, uhd_get_pipe_endpoint_address, and uhd_udesc_get_uhaddr.

Referenced by uhd_ep_abort_pipe(), uhd_ep_free(), and uhd_pipe_trans_complet().

static uhd_trans_status_t uhd_pipe_get_error ( uint8_t  pipe )

static

Translates the USBC pipe error to UHD error.

Parameters

pipe	Pipe number to use

Returns

UHD transfer error

References uhd_ack_pipe_error, UHD_TRANS_CRC, UHD_TRANS_DT_MISMATCH, UHD_TRANS_NOTRESPONDING, UHD_TRANS_PIDFAILURE, uhd_udesc_ack_error_status, uhd_udesc_get_error_status, USBC_UPERR_UPERR0_CRC16_MASK, USBC_UPERR_UPERR0_DATAPID_MASK, USBC_UPERR_UPERR0_DATATGL_MASK, USBC_UPERR_UPERR0_PID_MASK, and USBC_UPERR_UPERR0_TIMEOUT_MASK.

Referenced by uhd_ctrl_interrupt(), and uhd_pipe_interrupt().

static void uhd_pipe_interrupt ( uint8_t  pipe )

static

Manages the following pipe interrupts:

• OUT sent
• IN received
• Stall received
• Error during transfer

Parameters

pipe	Pipe number

References Assert, dbgp_ep, Is_uhd_in_received, Is_uhd_out_ready, Is_uhd_pipe_error, Is_uhd_pipe_frozen, Is_uhd_stall, uhd_ack_in_received, uhd_ack_out_ready, uhd_ack_pipe_error, uhd_ack_stall, uhd_disable_pipe_interrupt, uhd_ep_abort_pipe(), uhd_freeze_pipe, uhd_pipe_get_error(), uhd_pipe_trans_complet(), uhd_reset_data_toggle, and UHD_TRANS_STALL.

Referenced by uhd_interrupt().

static void uhd_pipe_trans_complet ( uint8_t  pipe )

static

Computes and starts the next transfer on a pipe.

Parameters

pipe	Pipe number

References Assert, uhd_pipe_job_t::b_shortpacket, uhd_pipe_job_t::buf, uhd_pipe_job_t::buf_internal, uhd_pipe_job_t::buf_size, uhd_pipe_job_t::busy, cpu_irq_restore(), cpu_irq_save(), Is_uhd_pipe_frozen, uhd_pipe_job_t::nb_trans, uhd_ack_fifocon, uhd_disable_continuous_in_mode, uhd_enable_continuous_in_mode, uhd_enable_in_received_interrupt, uhd_enable_out_ready_interrupt, uhd_enable_pipe_interrupt, UHD_ENDPOINT_MAX_TRANS, uhd_freeze_pipe, uhd_get_in_request_number, uhd_get_pipe_size, uhd_get_pipe_type, uhd_in_request_number, uhd_is_pipe_out, uhd_pipe_finish_job(), UHD_TRANS_NOERROR, uhd_udesc_get_buf0_ctn, uhd_udesc_get_buf0_size, uhd_udesc_rst_buf0_ctn, uhd_udesc_rst_buf0_size, uhd_udesc_set_buf0_addr, uhd_udesc_set_buf0_autozlp, uhd_udesc_set_buf0_ctn, uhd_udesc_set_buf0_size, and uhd_unfreeze_pipe.

Referenced by uhd_ep_run(), and uhd_pipe_interrupt().

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_send_resume, uhd_sleep_mode(), and UHD_STATE_IDLE.

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

Returns

true if the request has been accepted, otherwise false. Note: The swap of "req.wValues" from uin16_t to le16_t is done by UHD.

References uhd_ctrl_request_t::add, Assert, uhd_ctrl_request_t::callback_end, uhd_ctrl_request_t::callback_run, cpu_irq_restore(), cpu_irq_save(), uhd_ctrl_request_t::next_request, uhd_ctrl_request_t::payload, uhd_ctrl_request_t::payload_size, uhd_ctrl_request_t::req, and uhd_ctrl_phase_setup().

Referenced by uhc_dev_get_string(), uhc_dev_is_high_speed_support(), uhc_enumeration_step11(), uhc_enumeration_step12(), uhc_enumeration_step13(), uhc_enumeration_step14(), uhc_enumeration_step5(), uhc_enumeration_step9(), and uhc_remotewakeup().

static void uhd_sleep_mode ( enum uhd_usbc_state_enum  new_state )

static

Manages the sleep mode following the USBC state.

Parameters

new_state

New USBC state

References SLEEPMGR_BACKUP, sleepmgr_lock_mode(), SLEEPMGR_RET, SLEEPMGR_SLEEP_0, SLEEPMGR_SLEEP_1, sleepmgr_unlock_mode(), and UHD_STATE_OFF.

Referenced by otg_dual_disable(), otg_dual_enable(), uhd_disable(), uhd_enable(), uhd_interrupt(), uhd_resume(), and uhd_sof_interrupt().

static void uhd_sof_interrupt ( void  )

static

Manages timeouts and actions based on SOF events.

• Suspend delay
• Resume delay
• Setup packet delay
• Timeout on endpoint control transfer
• Timeouts on bulk/interrupt/isochronous endpoint transfers
• UHC user notification
• SOF user notification

References uhd_pipe_job_t::busy, ctz, dbg_print, dbgp_ctrl, dbgp_ep, Is_uhd_disconnection, Is_uhd_low_speed_mode, Is_uhd_sof_enabled, otg_freeze_clock, otg_get_fsm_drd_state, uhd_pipe_job_t::timeout, uhc_notify_resume(), uhc_notify_sof(), UHC_SOF_EVENT, uhd_ctrl_request_end(), uhd_disable_sof, uhd_enable_out_ready_interrupt, uhd_ep_abort_pipe(), uhd_freeze_pipe, uhd_get_frame_position, UHD_PEP_NB, uhd_raise_pipe_error, uhd_sleep_mode(), UHD_STATE_SUSPEND, UHD_TRANS_TIMEOUT, and uhd_unfreeze_pipe.

Referenced by uhd_interrupt().

void uhd_suspend

(

void

)

Enables the suspend state on the USB line.

The SUSPEND state is enable when SOF are disabled on USB line.

References Is_uhd_pipe_frozen, uhd_freeze_pipe, and UHD_PEP_NB.

Referenced by uhc_enumeration_suspend(), uhc_suspend(), and uhd_ctrl_request_end().

bool otg_initialized = false

static

State of USBC OTG initialization.

Referenced by otg_dual_disable(), and otg_dual_enable().

bool uhd_b_suspend_requested

static

Flag to delay a suspend request after all on-going setup request.

bool uhd_b_zlp_out_delayed = false

static

Flag to delay a ZLP OUT on control endpoint.

uint32_t uhd_ctrl_buffer[64/4]

Buffer to store the sent/received data on control endpoint.

Used to avoid a RAM buffer overflow when the payload buffer is smaller than control endpoint size. Also used when payload buffer is not word aligned.

Referenced by uhd_ctrl_phase_data_in(), uhd_ctrl_phase_data_out(), uhd_ctrl_phase_setup(), and uhd_ep0_alloc().

uint16_t uhd_ctrl_nb_trans

Number of transfered byte on DATA phase of current setup request.

struct uhd_ctrl_request_t* uhd_ctrl_request_first

Entry points of setup request list.

Referenced by uhd_ctrl_request_end().

struct uhd_ctrl_request_t* uhd_ctrl_request_last

uhd_ctrl_request_phase_t uhd_ctrl_request_phase

volatile uint16_t uhd_ctrl_request_timeout

Remaining time for on-going setup request (No request on-going if equal 0)

volatile uhd_desc_table_t uhd_g_pipe_table[UHD_PEP_NB]

static

USB SRAM data containing pipe descriptor table The content of the USB SRAM can be :

• modified by USB hardware interface to update pipe status. Thereby, it is read by software.
• modified by USB software to control pipe. Thereby, it is read by hardware. This data section is volatile.

Referenced by uhd_enable(), uhd_ep0_alloc(), and uhd_ep_alloc().

uhd_pipe_job_t uhd_pipe_job[UHD_PEP_NB-1]

static

Array to register a job on bulk/interrupt/isochronous endpoint.

uint8_t uhd_pipes_error

static

Variable to manage error on pipes.

uint8_t uhd_pipes_unfreeze

static

uhd_callback_reset_t uhd_reset_callback = NULL

static

Store the callback to be call at the end of reset signal.

Referenced by uhd_interrupt(), and uhd_send_reset().

uint8_t uhd_resume_start

static

uint8_t uhd_suspend_start

static

Variables to manage the suspend/resume sequence.