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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.
*/
// Minimal USB-MIDI 2.0 host example.
// Receives UMP from any MIDI 2.0 device, prints each packet to stdout.
#include <stdio.h>
#include <string.h>
#include "bsp/board_api.h"
#include "tusb.h"
#include "class/midi/midi2_host.h"
//--------------------------------------------------------------------+
// State
//--------------------------------------------------------------------+
TU_ATTR_UNUSED static uint8_t midi2_idx = 0xFF;
//--------------------------------------------------------------------+
// UMP printer - shows MT and word(s) in hex; decodes Channel Voice
//--------------------------------------------------------------------+
static void print_ump(const uint32_t* words, uint8_t wc) {
uint8_t mt = (uint8_t)((words[0] >> 28) & 0x0F);
uint8_t group = (uint8_t)((words[0] >> 24) & 0x0F);
if (mt == 0x4 && wc >= 2) {
// MIDI 2.0 Channel Voice
uint8_t status = (uint8_t)((words[0] >> 20) & 0x0F);
uint8_t channel = (uint8_t)((words[0] >> 16) & 0x0F);
uint8_t data1 = (uint8_t)((words[0] >> 8) & 0x7F);
switch (status) {
case 0x9:
printf("[g%u ch%u] M2 NoteOn n=%u vel=%04X attr=%04X\r\n",
group, channel, data1,
(unsigned)((words[1] >> 16) & 0xFFFF),
(unsigned)(words[1] & 0xFFFF));
break;
case 0x8:
printf("[g%u ch%u] M2 NoteOff n=%u vel=%04X\r\n",
group, channel, data1,
(unsigned)((words[1] >> 16) & 0xFFFF));
break;
case 0xB:
printf("[g%u ch%u] M2 CC#%u = %08lX\r\n",
group, channel, data1, (unsigned long)words[1]);
break;
case 0xC:
printf("[g%u ch%u] M2 ProgChg %u\r\n",
group, channel, (unsigned)((words[1] >> 24) & 0x7F));
break;
case 0xD:
printf("[g%u ch%u] M2 ChanPress %08lX\r\n",
group, channel, (unsigned long)words[1]);
break;
case 0xE:
printf("[g%u ch%u] M2 PitchBend %08lX\r\n",
group, channel, (unsigned long)words[1]);
break;
default:
printf("[g%u ch%u] M2 status=0x%X w0=%08lX w1=%08lX\r\n",
group, channel, status,
(unsigned long)words[0], (unsigned long)words[1]);
break;
}
} else if (mt == 0x2 && wc == 1) {
// MIDI 1.0 Channel Voice
uint8_t status = (uint8_t)((words[0] >> 16) & 0xFF);
uint8_t data1 = (uint8_t)((words[0] >> 8) & 0x7F);
uint8_t data2 = (uint8_t)(words[0] & 0x7F);
printf("[g%u] M1 %02X %02X %02X\r\n", group, status, data1, data2);
} else {
printf("UMP MT=0x%X wc=%u w0=%08lX\r\n",
mt, wc, (unsigned long)words[0]);
}
}
//--------------------------------------------------------------------+
// MIDI 2.0 Host Callbacks
//--------------------------------------------------------------------+
void tuh_midi2_descriptor_cb(uint8_t idx, const tuh_midi2_descriptor_cb_t* d) {
(void)idx;
printf("MIDI2 descriptor: %s, RX cables=%u TX cables=%u\r\n",
d->protocol_version ? "MIDI 2.0" : "MIDI 1.0",
d->rx_cable_count, d->tx_cable_count);
}
void tuh_midi2_mount_cb(uint8_t idx, const tuh_midi2_mount_cb_t* m) {
midi2_idx = idx;
printf("MIDI2 mounted: idx=%u protocol=%s\r\n",
idx, m->protocol_version ? "MIDI 2.0" : "MIDI 1.0");
}
void tuh_midi2_rx_cb(uint8_t idx, uint32_t xferred_bytes) {
(void)xferred_bytes;
uint32_t words[16];
while (1) {
uint32_t n = tuh_midi2_ump_read(idx, words, 16);
if (n == 0) break;
uint32_t i = 0;
while (i < n) {
uint8_t mt = (uint8_t)((words[i] >> 28) & 0x0F);
uint8_t wc = midi2_ump_word_count(mt);
if (i + wc > n) break;
print_ump(&words[i], wc);
i += wc;
}
}
}
void tuh_midi2_tx_cb(uint8_t idx, uint32_t xferred_bytes) {
(void)idx; (void)xferred_bytes;
}
void tuh_midi2_umount_cb(uint8_t idx) {
(void)idx;
midi2_idx = 0xFF;
printf("MIDI2 unmounted\r\n");
}
//--------------------------------------------------------------------+
// Main
//--------------------------------------------------------------------+
int main(void) {
board_init();
printf("\r\nTinyUSB Host MIDI 2.0 Example\r\n");
tusb_rhport_init_t host_init = {
.role = TUSB_ROLE_HOST,
.speed = TUSB_SPEED_AUTO,
};
tusb_init(BOARD_TUH_RHPORT, &host_init);
while (1) {
tuh_task();
}
}
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