minimal pico usb keyboard, no matrix switches just plain switches wired to pico gpio pin, tested and works with reduced number of gpio pin for testing

pico_usb_keyboard.txt

simple demo of usb keyboard
no matrix keyboard, 1 key per pico gpio
source from https://github.com/PhilboBaggins/pico-keys
tested good with switches

/************************
 * PicoKeysExample.c
 ***********************/
 #include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "bsp/board.h"
#include "hardware/uart.h"
#include "pico/stdlib.h"
#include "tusb.h"

#include "buttons.h"
#include "usb_descriptors.h"

// Map buttons to key codes - These will be send when the button is pressed
uint8_t BUTTON_KEY_MAP[NUM_BUTTONS] =
{
    HID_KEY_F21, HID_KEY_B, HID_KEY_C,
    HID_KEY_F22, HID_KEY_E, HID_KEY_F,
    HID_KEY_F23, HID_KEY_H, HID_KEY_I,
    HID_KEY_F24, HID_KEY_K, HID_KEY_L,
#if BOAD_MAJOR_VERSION == 1
    HID_KEY_M, HID_KEY_N, HID_KEY_O,
#endif
};

void hid_task(void);

//--------------------------------------------------------------------+
// Main
//--------------------------------------------------------------------+
int main(void)
{
    board_init();
    tusb_init();
    buttons_init();

    while (true)
    {
        tud_task(); // tinyusb device task
        hid_task();
    }

    return 0;
}

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

// Invoked when device is mounted
void tud_mount_cb(void)
{

}

// Invoked when device is unmounted
void tud_umount_cb(void)
{

}

// 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;
}

// Invoked when usb bus is resumed
void tud_resume_cb(void)
{

}

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

#define NUM_SIMULTANEOUS_USB_KEY_CODES 6

bool addKey(uint8_t existingKeycodes[NUM_SIMULTANEOUS_USB_KEY_CODES], uint8_t newKeyCode)
{
    // USB HID allows for 6 keys pressed at one time. So effectively there are 6 slots we could put out key code into
    // Go through each slot, check if it's empty and if so, put our key code in
    for (int idx = 0; idx < NUM_SIMULTANEOUS_USB_KEY_CODES; idx++)
    {
        if (existingKeycodes[idx] == 0)
        {
            existingKeycodes[idx] = newKeyCode;
            return true;
        }
    }

    // All slots full so could not add this new keycode
    return false;
}

// Every 10ms, check all buttons and send a keyboard report
// for any button (up tp 6 total) that are pressed or held 
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;

    static uint8_t prevSentKeycodes[6] = {0};
    uint8_t keycodes[6] = {0};

    // Check each button
    for (int buttonIdx = 0; buttonIdx < NUM_BUTTONS; buttonIdx++)
    {
        enum BUTTON_STATE state = buttonRead(buttonIdx);

        switch (state)
        {
        case BUTTON_NOT_PRESSED:
            break;
        case BUTTON_PRESSED:
            addKey(keycodes, BUTTON_KEY_MAP[buttonIdx]);
            break;
        case BUTTON_HELD_PRESSED:
            addKey(keycodes, BUTTON_KEY_MAP[buttonIdx]);
            break;
        case BUTTON_RELEASED:
            break;
        default:
            break;
        }
    }

    // Check if any new key codes need to be send
    bool newKeysToSend = false;
    for (int idx = 0; idx < NUM_SIMULTANEOUS_USB_KEY_CODES; idx++)
    {
        if (keycodes[idx] != prevSentKeycodes[idx])
        {
            newKeysToSend = true;
            prevSentKeycodes[idx] = keycodes[idx];
        }
    }

    if (newKeysToSend)
    {
        tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, keycodes);
    }
}

/********* I commented this function out because I'm getting compiler error ********/
// 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, uint8_t len)
//{
//    (void)instance;
//    (void)len;
//}

// 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)
{
    (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)instance;
    (void)report_id;
    (void)report_type;
    (void)buffer;
    (void)bufsize;
}

/******************************
 * buttons.h
 *****************************/
 
#ifndef _BUTTONS_H_
#define _BUTTONS_H_

#include <stdint.h>

// Select your board version (only define one and comment the others out)
//#define BOAD_MAJOR_VERSION 1
#define BOAD_MAJOR_VERSION 2

#if BOAD_MAJOR_VERSION == 1
    #define NUM_BUTTONS 16
#elif BOAD_MAJOR_VERSION == 2
    #define NUM_BUTTONS 12
#else
    #error Invalid board version selected
#endif

extern const int BUTTON_PINS[NUM_BUTTONS];

enum BUTTON_STATE
{
    BUTTON_NOT_PRESSED = 0,
    BUTTON_PRESSED,
    BUTTON_HELD_PRESSED,
    BUTTON_RELEASED,
};

// Function prototypes
void buttons_init();
enum BUTTON_STATE buttonRead(int buttonIdx);

#endif // _BUTTONS_H_

/********************************
 * buttons.c
 *******************************/
 #include <buttons.h>
#include "hardware/gpio.h"
#include <stdbool.h>

#if BOAD_MAJOR_VERSION == 1
    const int BUTTON_PINS[NUM_BUTTONS] = {16,17,18};//{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
#elif BOAD_MAJOR_VERSION == 2
    const int BUTTON_PINS[NUM_BUTTONS] = {16,17,18};//{ 27, 28, 5, 21, 20, 11, 18, 16, 13, 17, 15, 14 };
#else
    #error Invalid board version selected
#endif

void buttons_init()
{
    for (int buttonIdx = 0; buttonIdx < NUM_BUTTONS; buttonIdx++)
    {
        const int gpioNumber = BUTTON_PINS[buttonIdx];
        gpio_init(gpioNumber);
        gpio_set_dir(gpioNumber, GPIO_IN);
        gpio_pull_up(gpioNumber);
    }
}

enum BUTTON_STATE buttonRead(int buttonIdx)
{
    static bool prevBtnStates[NUM_BUTTONS] = { false };

    const int gpioNumber = BUTTON_PINS[buttonIdx];
    const bool prevState = prevBtnStates[buttonIdx];
    const bool currentState = gpio_get(gpioNumber);
    prevBtnStates[buttonIdx] = currentState;

    if (!prevState && currentState)
    {
        return BUTTON_RELEASED;
    }
    else if (prevState && !currentState)
    {
        return BUTTON_PRESSED;
    }
    else if (!prevState && !currentState)
    {
        return BUTTON_HELD_PRESSED;
    }
    else
    {
        return BUTTON_NOT_PRESSED;
    }
}

/*******************************
 * CMakeLists.txt
 *****************************/
 # Generated Cmake Pico project file

cmake_minimum_required(VERSION 3.13)

set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)

# Initialise pico_sdk from installed location
# (note this can come from environment, CMake cache etc)
#set(PICO_SDK_PATH "path/to/Pico/pico-sdk")

set(PICO_BOARD pico CACHE STRING "Board type")

# Pull in Raspberry Pi Pico SDK (must be before project)
include(pico_sdk_import.cmake)

if (PICO_SDK_VERSION_STRING VERSION_LESS "1.4.0")
  message(FATAL_ERROR "Raspberry Pi Pico SDK version 1.3.0 (or later) required. Your version is ${PICO_SDK_VERSION_STRING}")
endif()

project(PicoKeysExample C CXX ASM)

# Initialise the Raspberry Pi Pico SDK
pico_sdk_init()

# Add executable. Default name is the project name, version 0.1

add_executable(PicoKeysExample
    PicoKeysExample.c
    usb_descriptors.c
    buttons.c
)

pico_set_program_name(PicoKeysExample "PicoKeysExample")
pico_set_program_version(PicoKeysExample "0.1")

pico_enable_stdio_uart(PicoKeysExample 1)
pico_enable_stdio_usb(PicoKeysExample 0)

# Add the standard library to the build
target_link_libraries(PicoKeysExample
        pico_stdlib)

# Add the standard include files to the build
target_include_directories(PicoKeysExample PRIVATE
  ${CMAKE_CURRENT_LIST_DIR}
  ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts or any other standard includes, if required
)

# Add any user requested libraries
target_link_libraries(PicoKeysExample
    tinyusb_device
    tinyusb_board
)

pico_add_extra_outputs(PicoKeysExample)

/****************************
 * usb_descriptors.h
 ***************************/
 /* 
 * 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.
 */

#ifndef USB_DESCRIPTORS_H_
#define USB_DESCRIPTORS_H_

enum
{
  REPORT_ID_KEYBOARD = 1,
  REPORT_ID_MOUSE,
  REPORT_ID_CONSUMER_CONTROL,
  REPORT_ID_GAMEPAD,
  REPORT_ID_COUNT
};

#endif /* USB_DESCRIPTORS_H_ */

/**********************************
 * usb_descriptors.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 "tusb.h"
#include "usb_descriptors.h"

/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
 * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
 *
 * Auto ProductID layout's Bitmap:
 *   [MSB]       MIDI | HID | MSC | CDC          [LSB]
 */
#define _PID_MAP(itf, n)  ( (CFG_TUD_##itf) << (n) )
#define USB_PID           (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
                           _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) )

#define USB_VID   0xCafe
#define USB_BCD   0x0200

//--------------------------------------------------------------------+
// Device Descriptors
//--------------------------------------------------------------------+
tusb_desc_device_t const desc_device =
{
    .bLength            = sizeof(tusb_desc_device_t),
    .bDescriptorType    = TUSB_DESC_DEVICE,
    .bcdUSB             = USB_BCD,
    .bDeviceClass       = 0x00,
    .bDeviceSubClass    = 0x00,
    .bDeviceProtocol    = 0x00,
    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,

    .idVendor           = USB_VID,
    .idProduct          = USB_PID,
    .bcdDevice          = 0x0100,

    .iManufacturer      = 0x01,
    .iProduct           = 0x02,
    .iSerialNumber      = 0x03,

    .bNumConfigurations = 0x01
};

// Invoked when received GET DEVICE DESCRIPTOR
// Application return pointer to descriptor
uint8_t const * tud_descriptor_device_cb(void)
{
  return (uint8_t const *) &desc_device;
}

//--------------------------------------------------------------------+
// HID Report Descriptor
//--------------------------------------------------------------------+

uint8_t const desc_hid_report[] =
{
  TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(REPORT_ID_KEYBOARD         )),
  TUD_HID_REPORT_DESC_MOUSE   ( HID_REPORT_ID(REPORT_ID_MOUSE            )),
  TUD_HID_REPORT_DESC_CONSUMER( HID_REPORT_ID(REPORT_ID_CONSUMER_CONTROL )),
  TUD_HID_REPORT_DESC_GAMEPAD ( HID_REPORT_ID(REPORT_ID_GAMEPAD          ))
};

// Invoked when received GET HID REPORT DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_hid_descriptor_report_cb(uint8_t instance)
{
  (void) instance;
  return desc_hid_report;
}

//--------------------------------------------------------------------+
// Configuration Descriptor
//--------------------------------------------------------------------+

enum
{
  ITF_NUM_HID,
  ITF_NUM_TOTAL
};

#define  CONFIG_TOTAL_LEN  (TUD_CONFIG_DESC_LEN + TUD_HID_DESC_LEN)

#define EPNUM_HID   0x81

uint8_t const desc_configuration[] =
{
  // Config number, interface count, string index, total length, attribute, power in mA
  TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),

  // Interface number, string index, protocol, report descriptor len, EP In address, size & polling interval
  TUD_HID_DESCRIPTOR(ITF_NUM_HID, 0, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 5)
};

#if TUD_OPT_HIGH_SPEED
// Per USB specs: high speed capable device must report device_qualifier and other_speed_configuration

// other speed configuration
uint8_t desc_other_speed_config[CONFIG_TOTAL_LEN];

// device qualifier is mostly similar to device descriptor since we don't change configuration based on speed
tusb_desc_device_qualifier_t const desc_device_qualifier =
{
  .bLength            = sizeof(tusb_desc_device_qualifier_t),
  .bDescriptorType    = TUSB_DESC_DEVICE_QUALIFIER,
  .bcdUSB             = USB_BCD,

  .bDeviceClass       = 0x00,
  .bDeviceSubClass    = 0x00,
  .bDeviceProtocol    = 0x00,

  .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,
  .bNumConfigurations = 0x01,
  .bReserved          = 0x00
};

// Invoked when received GET DEVICE QUALIFIER DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete.
// device_qualifier descriptor describes information about a high-speed capable device that would
// change if the device were operating at the other speed. If not highspeed capable stall this request.
uint8_t const* tud_descriptor_device_qualifier_cb(void)
{
  return (uint8_t const*) &desc_device_qualifier;
}

// Invoked when received GET OTHER SEED CONFIGURATION DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
// Configuration descriptor in the other speed e.g if high speed then this is for full speed and vice versa
uint8_t const* tud_descriptor_other_speed_configuration_cb(uint8_t index)
{
  (void) index; // for multiple configurations

  // other speed config is basically configuration with type = OHER_SPEED_CONFIG
  memcpy(desc_other_speed_config, desc_configuration, CONFIG_TOTAL_LEN);
  desc_other_speed_config[1] = TUSB_DESC_OTHER_SPEED_CONFIG;

  // this example use the same configuration for both high and full speed mode
  return desc_other_speed_config;
}
#endif // highspeed

// Invoked when received GET CONFIGURATION DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
{
  (void) index; // for multiple configurations

  // This example use the same configuration for both high and full speed mode
  return desc_configuration;
}

//--------------------------------------------------------------------+
// String Descriptors
//--------------------------------------------------------------------+

// array of pointer to string descriptors
char const* string_desc_arr [] =
{
  (const char[]) { 0x09, 0x04 }, // 0: is supported language is English (0x0409)
  "TinyUSB",                     // 1: Manufacturer
  "TinyUSB Device",              // 2: Product
  "123456",                      // 3: Serials, should use chip ID
};

static uint16_t _desc_str[32];

// Invoked when received GET STRING DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
{
  (void) langid;

  uint8_t chr_count;

  if ( index == 0)
  {
    memcpy(&_desc_str[1], string_desc_arr[0], 2);
    chr_count = 1;
  }else
  {
    // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
    // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors

    if ( !(index < sizeof(string_desc_arr)/sizeof(string_desc_arr[0])) ) return NULL;

    const char* str = string_desc_arr[index];

    // Cap at max char
    chr_count = (uint8_t)strlen(str);
    if ( chr_count > 31 ) chr_count = 31;

    // Convert ASCII string into UTF-16
    for(uint8_t i=0; i<chr_count; i++)
    {
      _desc_str[1+i] = str[i];
    }
  }

  // first byte is length (including header), second byte is string type
  _desc_str[0] = (uint16_t)((TUSB_DESC_STRING << 8 ) | (2*chr_count + 2));

  return _desc_str;
}

/**************************************
 * tusb_config.h
 ************************************/
 /*
 * 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.
 *
 */

#ifndef _TUSB_CONFIG_H_
#define _TUSB_CONFIG_H_

#ifdef __cplusplus
 extern "C" {
#endif

//--------------------------------------------------------------------
// COMMON CONFIGURATION
//--------------------------------------------------------------------

// defined by board.mk
#ifndef CFG_TUSB_MCU
  #error CFG_TUSB_MCU must be defined
#endif

// RHPort number used for device can be defined by board.mk, default to port 0
#ifndef BOARD_DEVICE_RHPORT_NUM
  #define BOARD_DEVICE_RHPORT_NUM     0
#endif

// RHPort max operational speed can defined by board.mk
// Default to Highspeed for MCU with internal HighSpeed PHY (can be port specific), otherwise FullSpeed
#ifndef BOARD_DEVICE_RHPORT_SPEED
  #if (CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || \
       CFG_TUSB_MCU == OPT_MCU_NUC505  || CFG_TUSB_MCU == OPT_MCU_CXD56 || CFG_TUSB_MCU == OPT_MCU_SAMX7X)
    #define BOARD_DEVICE_RHPORT_SPEED   OPT_MODE_HIGH_SPEED
  #else
    #define BOARD_DEVICE_RHPORT_SPEED   OPT_MODE_FULL_SPEED
  #endif
#endif

// Device mode with rhport and speed defined by board.mk
#if   BOARD_DEVICE_RHPORT_NUM == 0
  #define CFG_TUSB_RHPORT0_MODE     (OPT_MODE_DEVICE | BOARD_DEVICE_RHPORT_SPEED)
#elif BOARD_DEVICE_RHPORT_NUM == 1
  #define CFG_TUSB_RHPORT1_MODE     (OPT_MODE_DEVICE | BOARD_DEVICE_RHPORT_SPEED)
#else
  #error "Incorrect RHPort configuration"
#endif

#ifndef CFG_TUSB_OS
#define CFG_TUSB_OS               OPT_OS_NONE
#endif

// CFG_TUSB_DEBUG is defined by compiler in DEBUG build
// #define CFG_TUSB_DEBUG           0

/* USB DMA on some MCUs can only access a specific SRAM region with restriction on alignment.
 * Tinyusb use follows macros to declare transferring memory so that they can be put
 * into those specific section.
 * e.g
 * - CFG_TUSB_MEM SECTION : __attribute__ (( section(".usb_ram") ))
 * - CFG_TUSB_MEM_ALIGN   : __attribute__ ((aligned(4)))
 */
#ifndef CFG_TUSB_MEM_SECTION
#define CFG_TUSB_MEM_SECTION
#endif

#ifndef CFG_TUSB_MEM_ALIGN
#define CFG_TUSB_MEM_ALIGN          __attribute__ ((aligned(4)))
#endif

//--------------------------------------------------------------------
// DEVICE CONFIGURATION
//--------------------------------------------------------------------

#ifndef CFG_TUD_ENDPOINT0_SIZE
#define CFG_TUD_ENDPOINT0_SIZE    64
#endif

//------------- CLASS -------------//
#define CFG_TUD_HID               1
#define CFG_TUD_CDC               0
#define CFG_TUD_MSC               0
#define CFG_TUD_MIDI              0
#define CFG_TUD_VENDOR            0

// HID buffer size Should be sufficient to hold ID (if any) + Data
#define CFG_TUD_HID_EP_BUFSIZE    16

#ifdef __cplusplus
 }
#endif

#endif /* _TUSB_CONFIG_H_ */