tinyUSB/examples/host/midi_rx/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 "class/midi/midi_host.h"


#if CFG_TUH_MIDI

//--------------------------------------------------------------------+
// STATIC GLOBALS DECLARATION
//--------------------------------------------------------------------+
static uint8_t midi_dev_addr = 0;

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
void led_blinking_task(void);
void midi_host_rx_task(void);

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

    printf("TinyUSB Host MIDI Example\r\n");

    tusb_init();

    while (1)
    {
        tuh_task();
        led_blinking_task();
        midi_host_rx_task();
    }

    return 0;
}

#endif

//--------------------------------------------------------------------+
// Blinking Task
//--------------------------------------------------------------------+
void led_blinking_task(void)
{
    const uint32_t interval_ms = 1000;
    static uint32_t start_ms = 0;

    static bool led_state = false;

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

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

//--------------------------------------------------------------------+
// MIDI host receive task
//--------------------------------------------------------------------+
void midi_host_rx_task(void)
{
    // device must be attached and have at least one endpoint ready to receive a message
    if (!midi_dev_addr || !tuh_midi_configured(midi_dev_addr))
    {
        return;
    }
    if (tuh_midih_get_num_rx_cables(midi_dev_addr) < 1)
    {
        return;
    }
    tuh_midi_read_poll(midi_dev_addr);
}

//--------------------------------------------------------------------+
// TinyUSB Callbacks
//--------------------------------------------------------------------+

// Invoked when device with hid interface is mounted
// Report descriptor is also available for use. tuh_hid_parse_report_descriptor()
// can be used to parse common/simple enough descriptor.
// Note: if report descriptor length > CFG_TUH_ENUMERATION_BUFSIZE, it will be skipped
// therefore report_desc = NULL, desc_len = 0
void tuh_midi_mount_cb(uint8_t dev_addr, uint8_t in_ep, uint8_t out_ep, uint8_t num_cables_rx, uint16_t num_cables_tx)
{
    TU_LOG1("MIDI device address = %u, IN endpoint %u has %u cables, OUT endpoint %u has %u cables\r\n",
           dev_addr, in_ep & 0xf, num_cables_rx, out_ep & 0xf, num_cables_tx);

    midi_dev_addr = dev_addr;
}

// Invoked when device with hid interface is un-mounted
void tuh_midi_umount_cb(uint8_t dev_addr, uint8_t instance)
{
    TU_LOG1("MIDI device address = %d, instance = %d is unmounted\r\n", dev_addr, instance);
    midi_dev_addr = 0;
}

void tuh_midi_rx_cb(uint8_t dev_addr, uint32_t num_packets)
{
    if (midi_dev_addr != dev_addr)
    {
        return;
    }

    if(num_packets == 0)
    {
        return;
    }

    uint8_t cable_num;
    uint8_t buffer[48];
    uint32_t bytes_read = tuh_midi_stream_read(dev_addr, &cable_num, buffer, sizeof(buffer));

    TU_LOG1("Read bytes %lu cable %u", bytes_read, cable_num);
    TU_LOG1_MEM(buffer, bytes_read, 2);
}

void tuh_midi_tx_cb(uint8_t dev_addr)
{
    (void ) dev_addr;
}