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/*
* The MIT License (MIT)
*
* Copyright (c) 2026 Saulo Verissimo
*
* 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 <string.h>
#include "bsp/board_api.h"
#include "tusb.h"
#include "class/audio/audio.h"
#include "class/midi/midi.h"
//--------------------------------------------------------------------+
// Device Descriptors
//--------------------------------------------------------------------+
static tusb_desc_device_t const desc_device = {
.bLength = sizeof(tusb_desc_device_t),
.bDescriptorType = TUSB_DESC_DEVICE,
.bcdUSB = 0x0200,
.bDeviceClass = 0x00,
.bDeviceSubClass = 0x00,
.bDeviceProtocol = 0x00,
.bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
.idVendor = 0xcafe,
.idProduct = 0x4062, // MIDI 2.0 Device
.bcdDevice = 0x0100,
.iManufacturer = 0x01,
.iProduct = 0x02,
.iSerialNumber = 0x03,
.bNumConfigurations = 0x01
};
uint8_t const * tud_descriptor_device_cb(void) {
return (uint8_t const *) &desc_device;
}
//--------------------------------------------------------------------+
// Configuration Descriptor - MIDI 2.0
//--------------------------------------------------------------------+
enum {
ITF_NUM_MIDI2 = 0, // Audio Control interface
ITF_NUM_MIDI2_STREAMING, // MIDI Streaming interface
ITF_NUM_TOTAL
};
#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_MIDI2_DESC_LEN)
// Endpoint addresses
#define EPNUM_MIDI2_OUT 0x01
#if CFG_TUD_ENDPOINT_ONE_DIRECTION_ONLY
#define EPNUM_MIDI2_IN 0x82
#else
#define EPNUM_MIDI2_IN 0x81
#endif
static uint8_t const desc_fs_configuration[] = {
// Config number, interface count, string index, total length, attribute, power in mA
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
// MIDI 2.0 Interface, two Group Terminal Blocks associated per direction:
// bulk OUT (host to device) carries the input block (ID 2)
// bulk IN (device to host) carries the output block (ID 1)
// Alt Setting 0 (MIDI 1.0)
TUD_MIDI_DESC_HEAD(ITF_NUM_MIDI2, 0, 1),
TUD_MIDI_DESC_JACK_DESC(1, 0),
TUD_MIDI_DESC_EP(EPNUM_MIDI2_OUT, 64, 1),
TUD_MIDI_JACKID_IN_EMB(1),
TUD_MIDI_DESC_EP(EPNUM_MIDI2_IN, 64, 1),
TUD_MIDI_JACKID_OUT_EMB(1),
// Alt Setting 1 (UMP)
TUD_MIDI2_DESC_ALT1_HEAD(ITF_NUM_MIDI2, 0),
TUD_MIDI2_DESC_ALT1_EP(EPNUM_MIDI2_OUT, 64, 1, 2),
TUD_MIDI2_DESC_ALT1_EP(EPNUM_MIDI2_IN, 64, 1, 1)
};
uint8_t const * tud_descriptor_configuration_cb(uint8_t index) {
(void) index;
return desc_fs_configuration;
}
//--------------------------------------------------------------------+
// String Descriptors
//--------------------------------------------------------------------+
enum {
STRID_LANGID = 0,
STRID_MANUFACTURER = 1,
STRID_PRODUCT = 2,
STRID_SERIAL = 3,
};
static char const *string_desc_arr[] = {
(const char[]) { 0x09, 0x04 }, // 0: Language
"TinyUSB", // 1: Manufacturer
"TinyUSB MIDI 2.0", // 2: Product
NULL, // 3: Serial
};
static uint16_t _desc_str[32 + 1];
uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
(void) langid;
size_t chr_count;
switch ( index ) {
case STRID_LANGID:
memcpy(&_desc_str[1], string_desc_arr[0], 2);
chr_count = 1;
break;
case STRID_SERIAL:
chr_count = board_usb_get_serial(_desc_str + 1, 32);
break;
default:
if (!(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0]))) {
return NULL;
}
const char *str = string_desc_arr[index];
chr_count = strlen(str);
const size_t max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1;
if ( chr_count > max_count ) {
chr_count = max_count;
}
for ( size_t i = 0; i < chr_count; i++ ) {
_desc_str[1 + i] = str[i];
}
break;
}
_desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
return _desc_str;
}
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