USB HID Class API

USB device specific part for HID support defined in include/zephyr/usb/class/usb_hid.h.

API Reference

Related code samples

USB HID (Human Interface Device)

Use USB HID driver to enumerate as a raw HID device.

group usb_hid_device_api

Typedefs

typedef int (*hid_cb_t)(const struct device *dev, struct usb_setup_packet *setup, int32_t *len, uint8_t **data)
typedef void (*hid_int_ready_callback)(const struct device *dev)
typedef void (*hid_protocol_cb_t)(const struct device *dev, uint8_t protocol)
typedef void (*hid_idle_cb_t)(const struct device *dev, uint16_t report_id)

Functions

void usb_hid_register_device(const struct device *dev, const uint8_t *desc, size_t size, const struct hid_ops *op)

Register HID device.

Parameters:

  • dev – [in] Pointer to USB HID device

  • desc – [in] Pointer to HID report descriptor

  • size – [in] Size of HID report descriptor

  • op – [in] Pointer to USB HID device interrupt struct

int hid_int_ep_write(const struct device *dev, const uint8_t *data, uint32_t data_len, uint32_t *bytes_ret)

Write to USB HID interrupt endpoint buffer.

Parameters:

  • dev – [in] Pointer to USB HID device

  • data – [in] Pointer to data buffer

  • data_len – [in] Length of data to copy

  • bytes_ret – [out] Bytes written to the EP buffer.

Returns:

0 on success, negative errno code on fail.

int hid_int_ep_read(const struct device *dev, uint8_t *data, uint32_t max_data_len, uint32_t *ret_bytes)

Read from USB HID interrupt endpoint buffer.

Parameters:

  • dev – [in] Pointer to USB HID device

  • data – [in] Pointer to data buffer

  • max_data_len – [in] Max length of data to copy

  • ret_bytes – [out] Number of bytes to copy. If data is NULL and max_data_len is 0 the number of bytes available in the buffer will be returned.

Returns:

0 on success, negative errno code on fail.

int usb_hid_set_proto_code(const struct device *dev, uint8_t proto_code)

Set USB HID class Protocol Code.

Should be called before usb_hid_init().

Parameters:

  • dev – [in] Pointer to USB HID device

  • proto_code – [in] Protocol Code to be used for bInterfaceProtocol

Returns:

0 on success, negative errno code on fail.

int usb_hid_init(const struct device *dev)

Initialize USB HID class support.

Parameters:

  • dev – [in] Pointer to USB HID device

Returns:

0 on success, negative errno code on fail.

struct hid_ops
#include <usb_hid.h>

USB HID device interface.