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USB Device Driver (UDD)

The UDD driver provides a low-level abstraction of the device controller hardware.

Most events coming from the hardware such as interrupts, which may cause the UDD to call into the UDC and UDI.

Data Structures

struct  udd_ctrl_request_t
 Global variable to give and record information of the setup request management. More...
 

Macros

#define Udd_setup_is_in()   (USB_REQ_DIR_IN == (udd_g_ctrlreq.req.bmRequestType & USB_REQ_DIR_MASK))
 Return true if the setup request udd_g_ctrlreq indicates IN data transfer. More...
 
#define Udd_setup_is_out()   (USB_REQ_DIR_OUT == (udd_g_ctrlreq.req.bmRequestType & USB_REQ_DIR_MASK))
 Return true if the setup request udd_g_ctrlreq indicates OUT data transfer. More...
 
#define Udd_setup_recipient()   (udd_g_ctrlreq.req.bmRequestType & USB_REQ_RECIP_MASK)
 Return the recipient of the SETUP request udd_g_ctrlreq. More...
 
#define Udd_setup_type()   (udd_g_ctrlreq.req.bmRequestType & USB_REQ_TYPE_MASK)
 Return the type of the SETUP request udd_g_ctrlreq. More...
 

Typedefs

typedef void(* udd_callback_halt_cleared_t )(void)
 End of halt callback function type. More...
 
typedef void(* udd_callback_trans_t )(udd_ep_status_t status, iram_size_t nb_transfered, udd_ep_id_t ep)
 End of transfer callback function type. More...
 
typedef uint8_t udd_ep_id_t
 Endpoint identifier. More...
 

Enumerations

enum  udd_ep_status_t {
  UDD_EP_TRANSFER_OK = 0,
  UDD_EP_TRANSFER_ABORT = 1
}
 Endpoint transfer status Returned in parameters of callback register via udd_ep_run routine. More...
 

Functions

void udd_attach (void)
 Attach device to the bus when possible. More...
 
void udd_detach (void)
 Detaches the device from the bus. More...
 
void udd_disable (void)
 Disables the USB Device mode. More...
 
void udd_enable (void)
 Enables the USB Device mode. More...
 
uint16_t udd_get_frame_number (void)
 Returns the current start of frame number. More...
 
uint16_t udd_get_micro_frame_number (void)
 Returns the current micro start of frame number. More...
 
uint8_t udd_getaddress (void)
 Returns the USB address of device. More...
 
bool udd_include_vbus_monitoring (void)
 Authorizes the VBUS event. More...
 
bool udd_is_high_speed (void)
 Test whether the USB Device Controller is running at high speed or not. More...
 
void udd_send_remotewakeup (void)
 The USB driver sends a resume signal called Upstream Resume. More...
 
void udd_set_address (uint8_t address)
 Changes the USB address of device. More...
 
void udd_set_setup_payload (uint8_t *payload, uint16_t payload_size)
 Load setup payload. More...
 

Variables

udd_ctrl_request_t udd_g_ctrlreq
 Global variable to give and record information of the set up request management. 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 udd_ep_alloc (udd_ep_id_t ep, uint8_t bmAttributes, uint16_t MaxEndpointSize)
 Configures and enables an endpoint. More...
 
void udd_ep_free (udd_ep_id_t ep)
 Disables an endpoint. More...
 
bool udd_ep_is_halted (udd_ep_id_t ep)
 Check if the endpoint ep is halted. More...
 
bool udd_ep_set_halt (udd_ep_id_t ep)
 Set the halted state of the endpoint ep. More...
 
bool udd_ep_clear_halt (udd_ep_id_t ep)
 Clear the halted state of the endpoint ep. More...
 
bool udd_ep_wait_stall_clear (udd_ep_id_t ep, udd_callback_halt_cleared_t callback)
 Registers a callback to call when endpoint halt is cleared. More...
 
bool udd_ep_run (udd_ep_id_t ep, bool b_shortpacket, uint8_t *buf, iram_size_t buf_size, udd_callback_trans_t callback)
 Allows to receive or send data on an endpoint. More...
 
void udd_ep_abort (udd_ep_id_t ep)
 Aborts transfer on going on endpoint. More...
 

High speed test mode management

The following functions allow the device to jump to a specific test mode required in high speed mode.

void udd_test_mode_j (void)
 
void udd_test_mode_k (void)
 
void udd_test_mode_se0_nak (void)
 
void udd_test_mode_packet (void)
 

UDC callbacks to provide for UDD

The following callbacks are used by UDD.

bool udc_process_setup (void)
 Decodes and manages a setup request. More...
 
void udc_reset (void)
 Reset the UDC. More...
 
void udc_sof_notify (void)
 To signal that a SOF is occurred. More...
 

#define Udd_setup_is_in ( )    (USB_REQ_DIR_IN == (udd_g_ctrlreq.req.bmRequestType & USB_REQ_DIR_MASK))

Return true if the setup request udd_g_ctrlreq indicates IN data transfer.

Referenced by _usb_ep0_on_setup(), udc_process_setup(), udc_reqstd(), udi_hid_setup(), and udi_msc_setup().

#define Udd_setup_is_out ( )    (USB_REQ_DIR_OUT == (udd_g_ctrlreq.req.bmRequestType & USB_REQ_DIR_MASK))

Return true if the setup request udd_g_ctrlreq indicates OUT data transfer.

Referenced by udi_hid_setup(), and udi_msc_setup().

#define Udd_setup_recipient ( )    (udd_g_ctrlreq.req.bmRequestType & USB_REQ_RECIP_MASK)

Return the recipient of the SETUP request udd_g_ctrlreq.

See Also
usb_recipient

Referenced by udc_process_setup(), and udc_reqstd().

#define Udd_setup_type ( )    (udd_g_ctrlreq.req.bmRequestType & USB_REQ_TYPE_MASK)

Return the type of the SETUP request udd_g_ctrlreq.

See Also
usb_reqtype.

Referenced by udc_process_setup(), udi_hid_setup(), and udi_msc_setup().

typedef void(* udd_callback_halt_cleared_t)(void)

End of halt callback function type.

Registered by routine udd_ep_wait_stall_clear() Callback called when endpoint stall is cleared.

typedef void(* udd_callback_trans_t)(udd_ep_status_t status, iram_size_t nb_transfered, udd_ep_id_t ep)

End of transfer callback function type.

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

Parameters
statusUDD_EP_TRANSFER_OK, if transfer is complete
statusUDD_EP_TRANSFER_ABORT, if transfer is aborted
nnumber of data transfered
typedef uint8_t udd_ep_id_t

Endpoint identifier.

Endpoint transfer status Returned in parameters of callback register via udd_ep_run routine.

Enumerator
UDD_EP_TRANSFER_OK 
UDD_EP_TRANSFER_ABORT 

bool udc_process_setup ( void  )

Decodes and manages a setup request.

The driver call it when a SETUP packet is received. The udd_g_ctrlreq contains the data of SETUP packet. If this callback accepts the setup request then it must return 1 and eventually update udd_g_ctrlreq to send or receive data.

Returns
1 if the request is accepted, otherwise 0.

Decodes and manages a setup request.

This function parses a USB SETUP request and submits an appropriate response back to the host or, in the case of SETUP OUT requests with data, sets up a buffer for receiving the data payload.

The main standard requests defined by the USB 2.0 standard are handled internally. The interface requests are sent to UDI, and the specific request sent to a specific application callback.

Returns
true if the request is supported, else the request is stalled by UDD

References udd_ctrl_request_t::callback, udd_ctrl_request_t::over_under_run, udd_ctrl_request_t::payload_size, udd_ctrl_request_t::req, udc_req_ep(), udc_req_iface(), udc_reqstd(), udd_g_ctrlreq, Udd_setup_is_in, Udd_setup_recipient, Udd_setup_type, USB_REQ_RECIP_ENDPOINT, USB_REQ_RECIP_INTERFACE, USB_REQ_TYPE_STANDARD, and usb_setup_req_t::wLength.

Referenced by _usb_ep0_on_setup().

void udc_sof_notify ( void  )

To signal that a SOF is occurred.

The UDC must send the signal to all UDIs enabled

References usb_conf_desc_t::bNumInterfaces, udc_config_speed_t::desc, udi_api_t::sof_notify, udc_num_configuration, udc_ptr_conf, and udc_config_speed_t::udi_apis.

Referenced by _usb_on_sof_notify().

void udd_attach ( void  )
void udd_detach ( void  )

Detaches the device from the bus.

The driver must remove pull-up on USB line D- or D+.

References udd_sleep_mode(), UDD_STATE_SUSPEND, usb_device, and usb_device_detach().

Referenced by _uhd_vbus_handler(), udc_detach(), and udd_disable().

void udd_disable ( void  )

Disables the USB Device mode.

References cpu_irq_restore(), cpu_irq_save(), udd_detach(), udd_sleep_mode(), UDD_STATE_OFF, and usb_dual_disable().

Referenced by udc_stop().

void udd_ep_abort ( udd_ep_id_t  ep)

Aborts transfer on going on 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
epEndpoint to abort

References udd_ep_get_job(), udd_ep_job_t, UDD_EP_TRANSFER_ABORT, usb_device, and usb_device_endpoint_abort_job().

Referenced by udc_req_std_ep_set_feature(), udd_ep_free(), udd_ep_set_halt(), and udi_msc_setup().

bool udd_ep_clear_halt ( udd_ep_id_t  ep)

Clear the halted state of the endpoint ep.

After calling this function, any transaction on ep will be handled normally, i.e. a STALL handshake will not be sent, and the data toggle sequence will start at DATA0.

Parameters
epThe ID of the endpoint to be un-halted
Returns
1 if function was successfully done, otherwise 0.

References udd_ep_get_job(), udd_ep_job_t, usb_device, usb_device_endpoint_clear_halt(), and USB_EP_ADDR_MASK.

Referenced by udc_req_std_ep_clear_feature().

bool udd_ep_is_halted ( udd_ep_id_t  ep)

Check if the endpoint ep is halted.

Parameters
epThe ID of the endpoint to check.
Returns
1 if ep is halted, otherwise 0.

References usb_device, and usb_device_endpoint_is_halted().

Referenced by udc_req_std_ep_get_status(), and udd_ep_run().

bool udd_ep_run ( udd_ep_id_t  ep,
bool  b_shortpacket,
uint8_t *  buf,
iram_size_t  buf_size,
udd_callback_trans_t  callback 
)

Allows to receive or send data on an endpoint.

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

Parameters
epThe ID of the endpoint to use
b_shortpacketEnabled automatic short packet
bufBuffer on Internal RAM to send or fill. It must be align, then use COMPILER_WORD_ALIGNED.
buf_sizeBuffer size to send or fill
callbackNULL or function to call at the end of transfer
Warning
About b_shortpacket, for IN endpoint it means that a short packet (or a Zero Length Packet) will be sent to the USB line to properly close the usb transfer at the end of the data transfer. For Bulk and Interrupt OUT endpoint, it will automatically stop the transfer at the end of the data transfer (received short packet).
Returns
1 if function was successfully done, otherwise 0.

References cpu_irq_restore(), cpu_irq_save(), usb_device_endpoint_config::ep_size, STATUS_OK, UDD_ENDPOINT_MAX_TRANS, udd_ep_get_job(), udd_ep_is_halted(), udd_ep_job_t, UDD_EP_TRANSFER_OK, usb_device, usb_device_endpoint_read_buffer_job(), usb_device_endpoint_write_buffer_job(), USB_EP_ADDR_MASK, and USB_EP_DIR_IN.

Referenced by udi_hid_kbd_send_report(), udi_msc_cbw_wait(), udi_msc_csw_send(), udi_msc_data_send(), and udi_msc_trans_block().

bool udd_ep_set_halt ( udd_ep_id_t  ep)

Set the halted state of the endpoint ep.

After calling this function, any transaction on ep will result in a STALL handshake being sent. Any pending transactions will be performed first, however.

Parameters
epThe ID of the endpoint to be halted
Returns
1 if ep is halted, otherwise 0.

References udd_ep_abort(), usb_device, usb_device_endpoint_set_halt(), and USB_EP_ADDR_MASK.

Referenced by udc_req_std_ep_set_feature(), udd_ctrl_out_received(), udi_msc_cbw_invalid(), udi_msc_csw_invalid(), and udi_msc_csw_process().

bool udd_ep_wait_stall_clear ( udd_ep_id_t  ep,
udd_callback_halt_cleared_t  callback 
)

Registers a callback to call when endpoint halt is cleared.

Parameters
epThe ID of the endpoint to use
callbackNULL or function to call when endpoint halt is cleared
Warning
if the endpoint is not halted then the callback is called immediately.
Returns
1 if the register is accepted, otherwise 0.

References udd_ep_get_job(), udd_ep_job_t, usb_device, usb_device_endpoint_is_configured(), usb_device_endpoint_is_halted(), and USB_EP_ADDR_MASK.

Referenced by udi_msc_cbw_invalid(), udi_msc_cbw_wait(), udi_msc_csw_invalid(), and udi_msc_csw_send().

uint16_t udd_get_frame_number ( void  )

Returns the current start of frame number.

Returns
current start of frame number.

References usb_device, and usb_device_get_frame_number().

Referenced by main_sof_action().

uint16_t udd_get_micro_frame_number ( void  )

Returns the current micro start of frame number.

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

References usb_device, and usb_device_get_micro_frame_number().

uint8_t udd_getaddress ( void  )

Returns the USB address of device.

Returns
USB address

References usb_device, and usb_device_get_address().

Referenced by udc_req_std_dev_set_configuration().

bool udd_include_vbus_monitoring ( void  )

Authorizes the VBUS event.

Returns
true, if the VBUS monitoring is possible.

Referenced by udc_include_vbus_monitoring().

bool udd_is_high_speed ( void  )

Test whether the USB Device Controller is running at high speed or not.

Returns
true if the Device is running at high speed mode, otherwise false.

Referenced by udc_req_std_dev_get_descriptor(), udc_req_std_dev_set_configuration(), and udc_req_std_dev_set_feature().

void udd_send_remotewakeup ( void  )

The USB driver sends a resume signal called Upstream Resume.

References udd_sleep_mode(), UDD_STATE_IDLE, udd_wait_clock_ready(), usb_device, usb_device_send_remote_wake_up(), and usb_get_state_machine_status().

Referenced by udc_remotewakeup().

void udd_set_address ( uint8_t  address)

Changes the USB address of device.

Parameters
addressNew USB address

References usb_device, and usb_device_set_address().

Referenced by udc_valid_address().

void udd_set_setup_payload ( uint8_t *  payload,
uint16_t  payload_size 
)
void udd_test_mode_j ( void  )
void udd_test_mode_k ( void  )
void udd_test_mode_packet ( void  )
void udd_test_mode_se0_nak ( void  )