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USBHID Class Reference

USBHID example. More...

#include <USBHID.h>

Inherits USBDevice.

Inherited by USBKeyboard, USBMouse, and USBMouseKeyboard.

Public Member Functions

 USBHID (bool connect_blocking=true, uint8_t output_report_length=64, uint8_t input_report_length=64, uint16_t vendor_id=0x1234, uint16_t product_id=0x0006, uint16_t product_release=0x0001)
 Basic constructor.
 USBHID (USBPhy *phy, uint8_t output_report_length, uint8_t input_report_length, uint16_t vendor_id, uint16_t product_id, uint16_t product_release)
 Fully featured constructor.
virtual ~USBHID ()
 Destroy this object.
bool ready ()
 Check if this class is ready.
void wait_ready ()
 Block until this HID device is in the configured state.
bool send (const HID_REPORT *report)
 Send a Report.
bool send_nb (const HID_REPORT *report)
 Send a Report.
bool read (HID_REPORT *report)
 Read a report: blocking.
bool read_nb (HID_REPORT *report)
 Read a report: non blocking.
void init ()
 Initialize this instance.
void deinit ()
 Power down this instance.
bool configured ()
 Check if the device is configured.
void connect ()
 Connect a device This method can also be used to resume USB operation when USB power is detected after it was suspended via USBDevice::deinit.
void disconnect ()
 Disconnect a device.
void sof_enable ()
 Enable the start of frame interrupt.
void sof_disable ()
 Disable the start of frame interrupt.
bool endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, mbed::Callback< void()> callback=NULL)
 Add an endpoint.
template<typename T >
bool endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, void(T::*callback)())
 Add an endpoint.
void endpoint_remove (usb_ep_t endpoint)
 Remove an endpoint.
void endpoint_remove_all ()
 Remove all non-zero endpoints.
void endpoint_stall (usb_ep_t endpoint)
 Stall an endpoint.
void endpoint_unstall (usb_ep_t endpoint)
 Un-stall an endpoint.
uint32_t endpoint_max_packet_size (usb_ep_t endpoint)
 Get the current maximum size for this endpoint.
void endpoint_abort (usb_ep_t endpoint)
 Abort the current transfer on this endpoint.
bool read_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
 start a read on the given endpoint
uint32_t read_finish (usb_ep_t endpoint)
 Get the status of a read.
bool write_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
 Write a data to the given endpoint.
uint32_t write_finish (usb_ep_t endpoint)
 Get the status of a write.

Protected Member Functions

virtual void callback_state_change (DeviceState new_state)
 Called when USB changes state.
virtual void callback_request (const setup_packet_t *setup)
 Called by USBDevice on Endpoint0 request.
virtual void callback_request_xfer_done (const setup_packet_t *setup, bool aborted)
 Called by USBDevice on data stage completion.
virtual void callback_power (bool powered)
 Called by USBDevice layer on power state change.
virtual void callback_sof (int frame_number)
 Called by USBDevice layer on each new USB frame.
virtual void callback_reset ()
 Called by USBDevice layer on bus reset.
void complete_request (RequestResult result, uint8_t *data=NULL, uint32_t size=0)
 Called to complete the setup stage of a callback request.
void complete_request_xfer_done (bool success)
 Called to complete the data stage of a callback request.
void complete_set_configuration (bool success)
 Called to complete a set configuration command.
void complete_set_interface (bool success)
 Called to complete a set interface command.
uint8_t * find_descriptor (uint8_t descriptor_type, uint8_t index=0)
 Find a descriptor type inside the configuration descriptor.
const usb_ep_table_t * endpoint_table ()
 Get the endpoint table of this device.
virtual void start_process ()
 Callback called to indicate the USB processing needs to be done.
virtual void lock ()
 Acquire exclusive access to this instance USBDevice.
virtual void unlock ()
 Release exclusive access to this instance USBDevice.
virtual void assert_locked ()
 Assert that the current thread of execution holds the lock.

Detailed Description

USBHID example.

 #include "mbed.h"
 #include "USBHID.h"

 USBHID hid;
 HID_REPORT recv;
 BusOut leds(LED1,LED2,LED3,LED4);

 int main(void) {
    while (1) {
        hid.read(&recv);
        leds = recv.data[0];
    }
 }

Definition at line 53 of file USBHID.h.


Constructor & Destructor Documentation

USBHID ( bool  connect_blocking = true,
uint8_t  output_report_length = 64,
uint8_t  input_report_length = 64,
uint16_t  vendor_id = 0x1234,
uint16_t  product_id = 0x0006,
uint16_t  product_release = 0x0001 
)

Basic constructor.

Construct this object optionally connecting and blocking until it is ready.

Note:
Do not use this constructor in derived classes.
Parameters:
connect_blockingtrue to perform a blocking connect, false to start in a disconnected state
output_report_lengthMaximum length of a sent report (up to 64 bytes)
input_report_lengthMaximum length of a received report (up to 64 bytes)
vendor_idYour vendor_id
product_idYour product_id
product_releaseYour product_release

Definition at line 111 of file USBHID.cpp.

USBHID ( USBPhy phy,
uint8_t  output_report_length,
uint8_t  input_report_length,
uint16_t  vendor_id,
uint16_t  product_id,
uint16_t  product_release 
)

Fully featured constructor.

Construct this object with the supplied USBPhy and parameters. The user this object is responsible for calling connect() or init().

Note:
Derived classes must use this constructor and call init() or connect() themselves. Derived classes should also call deinit() in their destructor. This ensures that no interrupts can occur when the object is partially constructed or destroyed.
Parameters:
phyUSB phy to use
output_report_lengthMaximum length of a sent report (up to 64 bytes)
input_report_lengthMaximum length of a received report (up to 64 bytes)
vendor_idYour vendor_id
product_idYour product_id
product_releaseYour product_release

Definition at line 124 of file USBHID.cpp.

~USBHID (  ) [virtual]

Destroy this object.

Any classes which inherit from this class must call deinit before this destructor runs.

Definition at line 130 of file USBHID.cpp.


Member Function Documentation

void assert_locked (  ) [protected, virtual, inherited]

Assert that the current thread of execution holds the lock.

Definition at line 1737 of file USBDevice.cpp.

virtual void callback_power ( bool  powered ) [protected, virtual, inherited]

Called by USBDevice layer on power state change.

Parameters:
poweredtrue if device is powered, false otherwise

Warning: Called in ISR context

Definition at line 342 of file USBDevice.h.

void callback_request ( const setup_packet_t *  setup ) [protected, virtual]

Called by USBDevice on Endpoint0 request.

This is used to handle extensions to standard requests and class specific requests. The function complete_request must be always be called in response to this callback.

Warning: Called in ISR context

Implements USBDevice.

Definition at line 301 of file USBHID.cpp.

void callback_request_xfer_done ( const setup_packet_t *  setup,
bool  aborted 
) [protected, virtual]

Called by USBDevice on data stage completion.

The function complete_request_xfer_done must be always be called in response to this callback.

Parameters:
setupSetup packet of the current request
abortedfalse if the operation was aborted, true otherwise

Warning: Called in ISR context

Implements USBDevice.

Definition at line 362 of file USBHID.cpp.

virtual void callback_reset (  ) [protected, virtual, inherited]

Called by USBDevice layer on bus reset.

complete_reset must be called after the device is fully reset.

Warning: Called in ISR context

Definition at line 370 of file USBDevice.h.

virtual void callback_sof ( int  frame_number ) [protected, virtual, inherited]

Called by USBDevice layer on each new USB frame.

Callbacks are enabled and disabled by calling sof_enable and sof_disable.

Parameters:
frame_numberThe current frame number

Warning: Called in ISR context

Definition at line 357 of file USBDevice.h.

void callback_state_change ( DeviceState  new_state ) [protected, virtual]

Called when USB changes state.

Parameters:
new_stateThe new state of the USBDevice

Warning: Called in ISR context

Implements USBDevice.

Definition at line 274 of file USBHID.cpp.

void complete_request ( RequestResult  result,
uint8_t *  data = NULL,
uint32_t  size = 0 
) [protected, inherited]

Called to complete the setup stage of a callback request.

Possible options that can be passed as a result are:

  • Receive - Start the data OUT phase of this control transfer
  • Send - Start the data IN phase of this control transfer
  • Success - Operation was a success so start the status phase
  • Failure - Operation failed or is unsupported so send a stall
  • PassThrough - Pass on the request for standard processing
Parameters:
resultThe result of the setup phase.
dataBuffer to send or receive if the result is Send or Receive
sizeSize to transfer if the result is Send or Receive

Definition at line 694 of file USBDevice.cpp.

void complete_request_xfer_done ( bool  success ) [protected, inherited]

Called to complete the data stage of a callback request.

Parameters:
successtrue if the operation was successful, false otherwise

Definition at line 313 of file USBDevice.cpp.

void complete_set_configuration ( bool  success ) [protected, inherited]

Called to complete a set configuration command.

Parameters:
successtrue if the configuration was set, false otherwise

Definition at line 386 of file USBDevice.cpp.

void complete_set_interface ( bool  success ) [protected, inherited]

Called to complete a set interface command.

Parameters:
successtrue if the interface was set, false otherwise

Definition at line 466 of file USBDevice.cpp.

bool configured (  ) [inherited]

Check if the device is configured.

Returns:
true if configured, false otherwise

Definition at line 1043 of file USBDevice.cpp.

void connect (  ) [inherited]

Connect a device This method can also be used to resume USB operation when USB power is detected after it was suspended via USBDevice::deinit.

Reimplemented in USBAudio, and USBMSD.

Definition at line 1054 of file USBDevice.cpp.

void deinit (  ) [inherited]

Power down this instance.

Disable interrupts and stop sending events. This method can be used for temporary power-saving; This call can allow USB to be temporarily disabled to permit power saving. However, it is up to the user to make sure all the transfers have concluded (for example when USB power is lost). USBDevice::connect can be used to resume USB operation.

Definition at line 1030 of file USBDevice.cpp.

void disconnect ( void   ) [inherited]

Disconnect a device.

Reimplemented in USBAudio, and USBMSD.

Definition at line 1070 of file USBDevice.cpp.

void endpoint_abort ( usb_ep_t  endpoint ) [inherited]

Abort the current transfer on this endpoint.

Parameters:
endpointendpoint with transfer to abort
Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1396 of file USBDevice.cpp.

bool endpoint_add ( usb_ep_t  endpoint,
uint32_t  max_packet,
usb_ep_type_t  type,
mbed::Callback< void()>  callback = NULL 
) [inherited]

Add an endpoint.

Parameters:
endpointEndpoint to enable
max_packetMaximum size of a packet which can be sent or received on this endpoint
typeEndpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callbackMethod pointer to be called when a packet is transferred
Returns:
true if successful, false otherwise

Definition at line 1109 of file USBDevice.cpp.

bool endpoint_add ( usb_ep_t  endpoint,
uint32_t  max_packet,
usb_ep_type_t  type,
void(T::*)()  callback 
) [inherited]

Add an endpoint.

Parameters:
endpointEndpoint to enable
max_packetMaximum size of a packet which can be sent or received on this endpoint
typeEndpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callbackMethod pointer to be called when a packet is transferred
Returns:
true if successful, false otherwise

Definition at line 162 of file USBDevice.h.

uint32_t endpoint_max_packet_size ( usb_ep_t  endpoint ) [inherited]

Get the current maximum size for this endpoint.

Return the currently configured maximum packet size, wMaxPacketSize, for this endpoint.

Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1380 of file USBDevice.cpp.

void endpoint_remove ( usb_ep_t  endpoint ) [inherited]

Remove an endpoint.

Parameters:
endpointEndpoint to disable
Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1149 of file USBDevice.cpp.

void endpoint_remove_all (  ) [inherited]

Remove all non-zero endpoints.

Definition at line 1190 of file USBDevice.cpp.

void endpoint_stall ( usb_ep_t  endpoint ) [inherited]

Stall an endpoint.

If there is an ongoing transfer on this endpoint then it will be aborted.

Parameters:
endpointEndpoint to stall
Note:
You cannot stall endpoint 0 with this function
This endpoint must already have been setup with endpoint_add

Definition at line 1204 of file USBDevice.cpp.

const usb_ep_table_t * endpoint_table (  ) [protected, inherited]

Get the endpoint table of this device.

Returns:
Endpoint table of the USBPhy attached to this USBDevice

Definition at line 1321 of file USBDevice.cpp.

void endpoint_unstall ( usb_ep_t  endpoint ) [inherited]

Un-stall an endpoint.

Un-stalling an endpoint resets data toggle back to DATA0. Additionally, if there is an ongoing transfer on this endpoint it will be aborted.

Parameters:
endpointEndpoint to un-stall
Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1241 of file USBDevice.cpp.

uint8_t * find_descriptor ( uint8_t  descriptor_type,
uint8_t  index = 0 
) [protected, inherited]

Find a descriptor type inside the configuration descriptor.

Parameters:
descriptor_typeType of descriptor to find
indexConfiguration descriptor index ( 0 if only one configuration present )
Returns:
A descriptor of the given type or NULL if none were found

Definition at line 1278 of file USBDevice.cpp.

void init (  ) [inherited]

Initialize this instance.

This function must be called before calling any other functions of this class, unless specifically

Definition at line 1017 of file USBDevice.cpp.

void lock ( void   ) [protected, virtual, inherited]

Acquire exclusive access to this instance USBDevice.

Definition at line 1714 of file USBDevice.cpp.

bool read ( HID_REPORT *  report )

Read a report: blocking.

Parameters:
reportpointer to the report to fill
Returns:
true if successful

Definition at line 205 of file USBHID.cpp.

uint32_t read_finish ( usb_ep_t  endpoint ) [inherited]

Get the status of a read.

Parameters:
endpointendpoint to get the status of
Returns:
number of bytes read by this endpoint

Definition at line 1489 of file USBDevice.cpp.

bool read_nb ( HID_REPORT *  report )

Read a report: non blocking.

Parameters:
reportpointer to the report to fill
Returns:
true if successful

Definition at line 219 of file USBHID.cpp.

bool read_start ( usb_ep_t  endpoint,
uint8_t *  buffer,
uint32_t  size 
) [inherited]

start a read on the given endpoint

Start a read on the given endpoint. The data buffer must remain unchanged until the transfer either completes or is aborted.

Parameters:
endpointendpoint to read data from
bufferbuffer to fill with read data
sizeThe size of data to read. This must be greater than or equal to the max packet size for this endpoint
Returns:
true if the read was completed, otherwise false
Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1431 of file USBDevice.cpp.

bool ready (  )

Check if this class is ready.

Returns:
true if the device is in the configured state

Definition at line 153 of file USBHID.cpp.

bool send ( const HID_REPORT *  report )

Send a Report.

warning: blocking

Parameters:
reportReport which will be sent (a report is defined by all data and the length)
Returns:
true if successful

Definition at line 171 of file USBHID.cpp.

bool send_nb ( const HID_REPORT *  report )

Send a Report.

warning: non blocking

Parameters:
reportReport which will be sent (a report is defined by all data and the length)
Returns:
true if successful

Definition at line 184 of file USBHID.cpp.

void sof_disable (  ) [inherited]

Disable the start of frame interrupt.

Stop calling USBDevice::callback_sof.

Definition at line 1100 of file USBDevice.cpp.

void sof_enable (  ) [inherited]

Enable the start of frame interrupt.

Call USBDevice::callback_sof on every frame.

Definition at line 1091 of file USBDevice.cpp.

void start_process (  ) [protected, virtual, inherited]

Callback called to indicate the USB processing needs to be done.

Implements USBPhyEvents.

Definition at line 1705 of file USBDevice.cpp.

void unlock ( void   ) [protected, virtual, inherited]

Release exclusive access to this instance USBDevice.

Definition at line 1721 of file USBDevice.cpp.

void wait_ready (  )

Block until this HID device is in the configured state.

Definition at line 158 of file USBHID.cpp.

uint32_t write_finish ( usb_ep_t  endpoint ) [inherited]

Get the status of a write.

Parameters:
endpointendpoint to get the status of
Returns:
number of bytes sent by this endpoint

Definition at line 1583 of file USBDevice.cpp.

bool write_start ( usb_ep_t  endpoint,
uint8_t *  buffer,
uint32_t  size 
) [inherited]

Write a data to the given endpoint.

Write data to an endpoint. The data sent must remain unchanged until the transfer either completes or is aborted.

Parameters:
endpointendpoint to write data to
bufferdata to write
sizethe size of data to send. This must be less than or equal to the max packet size of this endpoint
Note:
This endpoint must already have been setup with endpoint_add

Definition at line 1522 of file USBDevice.cpp.