tinyusb/examples/device/hid_boot_interface/src/main.c

/* 
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "bsp/board.h"
#include "tusb.h"
#include "usb_descriptors.h"

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+

/* Blink pattern
 * - 250 ms  : device not mounted
 * - 1000 ms : device mounted
 * - 2500 ms : device is suspended
 */
enum  {
  BLINK_NOT_MOUNTED = 250,
  BLINK_MOUNTED = 1000,
  BLINK_SUSPENDED = 2500,
};

static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;

void led_blinking_task(void);
void hid_task(void);

/*------------- MAIN -------------*/
int main(void)
{
  board_init();

  // init device stack on configured roothub port
  tud_init(BOARD_TUD_RHPORT);

  while (1)
  {
    tud_task(); // tinyusb device task
    led_blinking_task();

    hid_task();
  }

  return 0;
}

//--------------------------------------------------------------------+
// Device callbacks
//--------------------------------------------------------------------+

// Invoked when device is mounted
void tud_mount_cb(void)
{
  blink_interval_ms = BLINK_MOUNTED;
}

// Invoked when device is unmounted
void tud_umount_cb(void)
{
  blink_interval_ms = BLINK_NOT_MOUNTED;
}

// Invoked when usb bus is suspended
// remote_wakeup_en : if host allow us  to perform remote wakeup
// Within 7ms, device must draw an average of current less than 2.5 mA from bus
void tud_suspend_cb(bool remote_wakeup_en)
{
  (void) remote_wakeup_en;
  blink_interval_ms = BLINK_SUSPENDED;
}

// Invoked when usb bus is resumed
void tud_resume_cb(void)
{
  blink_interval_ms = BLINK_MOUNTED;
}

//--------------------------------------------------------------------+
// USB HID
//--------------------------------------------------------------------+

// Every 10ms, we will sent 1 report for each HID profile (keyboard, mouse etc ..)
// tud_hid_report_complete_cb() is used to send the next report after previous one is complete
void hid_task(void)
{
  // Poll every 10ms
  const uint32_t interval_ms = 10;
  static uint32_t start_ms = 0;

  if ( board_millis() - start_ms < interval_ms) return; // not enough time
  start_ms += interval_ms;

  uint32_t const btn = board_button_read();

  if ( tud_suspended() && btn )
  {
    // Wake up host if we are in suspend mode
    // and REMOTE_WAKEUP feature is enabled by host
    tud_remote_wakeup();
  }
  else
  {
    // keyboard interface
    if ( tud_hid_n_ready(ITF_NUM_KEYBOARD) )
    {
      // used to avoid send multiple consecutive zero report for keyboard
      static bool has_keyboard_key = false;

      uint8_t const report_id = 0;
      uint8_t const modifier  = 0;

      if ( btn )
      {
        uint8_t keycode[6] = { 0 };
        keycode[0] = HID_KEY_ARROW_RIGHT;

        tud_hid_n_keyboard_report(ITF_NUM_KEYBOARD, report_id, modifier, keycode);
        has_keyboard_key = true;
      }else
      {
        // send empty key report if previously has key pressed
        if (has_keyboard_key) tud_hid_n_keyboard_report(ITF_NUM_KEYBOARD, report_id, modifier, NULL);
        has_keyboard_key = false;
      }
    }

    // mouse interface
    if ( tud_hid_n_ready(ITF_NUM_MOUSE) )
    {
      if ( btn )
      {
        uint8_t const report_id   = 0;
        uint8_t const button_mask = 0;
        uint8_t const vertical    = 0;
        uint8_t const horizontal  = 0;
        int8_t  const delta       = 5;

        tud_hid_n_mouse_report(ITF_NUM_MOUSE, report_id, button_mask, delta, delta, vertical, horizontal);
      }
    }
  }
}

// Invoked when received SET_PROTOCOL request
// protocol is either HID_PROTOCOL_BOOT (0) or HID_PROTOCOL_REPORT (1)
void tud_hid_set_protocol_cb(uint8_t instance, uint8_t protocol)
{
  (void) instance;
  (void) protocol;

  // nothing to do since we use the same compatible boot report for both Boot and Report mode.
  // TODO set a indicator for user
}

// Invoked when sent REPORT successfully to host
// Application can use this to send the next report
// Note: For composite reports, report[0] is report ID
void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, /*uint16_t*/ uint8_t len)
{
  (void) instance;
  (void) report;
  (void) len;

  // nothing to do
}

// Invoked when received GET_REPORT control request
// Application must fill buffer report's content and return its length.
// Return zero will cause the stack to STALL request
uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
{
  // TODO not Implemented
  (void) instance;
  (void) report_id;
  (void) report_type;
  (void) buffer;
  (void) reqlen;

  return 0;
}

// Invoked when received SET_REPORT control request or
// received data on OUT endpoint ( Report ID = 0, Type = 0 )
void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
{
  (void) report_id;

  // keyboard interface
  if (instance == ITF_NUM_KEYBOARD)
  {
    // Set keyboard LED e.g Capslock, Numlock etc...
    if (report_type == HID_REPORT_TYPE_OUTPUT)
    {
      // bufsize should be (at least) 1
      if ( bufsize < 1 ) return;

      uint8_t const kbd_leds = buffer[0];

      if (kbd_leds & KEYBOARD_LED_CAPSLOCK)
      {
        // Capslock On: disable blink, turn led on
        blink_interval_ms = 0;
        board_led_write(true);
      }else
      {
        // Caplocks Off: back to normal blink
        board_led_write(false);
        blink_interval_ms = BLINK_MOUNTED;
      }
    }
  }
}

//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
void led_blinking_task(void)
{
  static uint32_t start_ms = 0;
  static bool led_state = false;

  // blink is disabled
  if (!blink_interval_ms) return;

  // Blink every interval ms
  if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
  start_ms += blink_interval_ms;

  board_led_write(led_state);
  led_state = 1 - led_state; // toggle
}