tinyusb/examples/device/midi_test_freertos/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_api.h"
#include "tusb.h"

/* This MIDI example send sequence of note (on/off) repeatedly. To test on PC, you need to install
 * synth software and midi connection management software. On
 * - Linux (Ubuntu): install qsynth, qjackctl. Then connect TinyUSB output port to FLUID Synth input port
 * - Windows: install MIDI-OX
 * - MacOS: SimpleSynth
 */

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
#if TUSB_MCU_VENDOR_ESPRESSIF
  #define USBD_STACK_SIZE     4096
#else
  // Increase stack size when debug log is enabled
  #define USBD_STACK_SIZE    (3*configMINIMAL_STACK_SIZE/2) * (CFG_TUSB_DEBUG ? 2 : 1)
#endif

#define BLINKY_STACK_SIZE   configMINIMAL_STACK_SIZE
#define MIDI_STACK_SIZE     configMINIMAL_STACK_SIZE

// static task
#if configSUPPORT_STATIC_ALLOCATION
StackType_t blinky_stack[BLINKY_STACK_SIZE];
StaticTask_t blinky_taskdef;

StackType_t  usb_device_stack[USBD_STACK_SIZE];
StaticTask_t usb_device_taskdef;

StackType_t  midi_stack[MIDI_STACK_SIZE];
StaticTask_t midi_taskdef;
#endif

/* 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 usb_device_task(void *param);
void led_blinking_task(void* param);
void midi_task(void* param);

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

#if configSUPPORT_STATIC_ALLOCATION
  xTaskCreateStatic(led_blinking_task, "blinky", BLINKY_STACK_SIZE, NULL, 1, blinky_stack, &blinky_taskdef);
  xTaskCreateStatic(usb_device_task, "usbd", USBD_STACK_SIZE, NULL, configMAX_PRIORITIES-1, usb_device_stack, &usb_device_taskdef);
  xTaskCreateStatic(midi_task, "midi", MIDI_STACK_SIZE, NULL, configMAX_PRIORITIES - 2, midi_stack, &midi_taskdef);
#else
  xTaskCreate(led_blinking_task, "blinky", BLINKY_STACK_SIZE, NULL, 1, NULL);
  xTaskCreate(usb_device_task, "usbd", USBD_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL);
  xTaskCreate(midi_task, "midi", MIDI_STACK_SIZE, NULL, configMAX_PRIORITIES - 2, NULL);
#endif

#if !TUSB_MCU_VENDOR_ESPRESSIF
  // skip starting scheduler (and return) for ESP32-S2 or ESP32-S3
  vTaskStartScheduler();
#endif

  return 0;
}

#if TUSB_MCU_VENDOR_ESPRESSIF
void app_main(void) {
  main();
}
#endif

// USB Device Driver task
// This top level thread process all usb events and invoke callbacks
void usb_device_task(void *param) {
  (void) param;

  // init device stack on configured roothub port
  // This should be called after scheduler/kernel is started.
  // Otherwise it could cause kernel issue since USB IRQ handler does use RTOS queue API.
  tusb_rhport_init_t dev_init = {
    .role = TUSB_ROLE_DEVICE,
    .speed = TUSB_SPEED_AUTO
  };
  tusb_init(BOARD_TUD_RHPORT, &dev_init);

  if (board_init_after_tusb) {
    board_init_after_tusb();
  }

  // RTOS forever loop
  while (1) {
    // put this thread to waiting state until there is new events
    tud_task();
  }
}

//--------------------------------------------------------------------+
// 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 = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
}

//--------------------------------------------------------------------+
// MIDI Task
//--------------------------------------------------------------------+

// Store example melody as an array of note values
const uint8_t note_sequence[] = {
  74,78,81,86,90,93,98,102,57,61,66,69,73,78,81,85,88,92,97,100,97,92,88,85,81,78,
  74,69,66,62,57,62,66,69,74,78,81,86,90,93,97,102,97,93,90,85,81,78,73,68,64,61,
  56,61,64,68,74,78,81,86,90,93,98,102
};

void midi_task(void* param) {
  (void) param;

  const uint8_t cable_num = 0; // MIDI jack associated with USB endpoint
  const uint8_t channel   = 0; // 0 for channel 1

  // Variable that holds the current position in the sequence.
  uint32_t note_pos = 0;

  while (1) {
    // send note periodically
    vTaskDelay(286  / portTICK_PERIOD_MS);

    // Previous positions in the note sequence.
    int previous = (int) (note_pos - 1);

    // If we currently are at position 0, set the
    // previous position to the last note in the sequence.
    if (previous < 0) {
      previous = sizeof(note_sequence) - 1;
    }

    // Send Note On for current position at full velocity (127) on channel 1.
    uint8_t note_on[3] = { 0x90 | channel, note_sequence[note_pos], 127 };
    tud_midi_stream_write(cable_num, note_on, 3);

    // Send Note Off for previous note.
    uint8_t note_off[3] = { 0x80 | channel, note_sequence[previous], 0};
    tud_midi_stream_write(cable_num, note_off, 3);

    // Increment position
    note_pos++;

    // If we are at the end of the sequence, start over.
    if (note_pos >= sizeof(note_sequence)) {
      note_pos = 0;
    }

    // The MIDI interface always creates input and output port/jack descriptors
    // regardless of these being used or not. Therefore incoming traffic should be read
    // (possibly just discarded) to avoid the sender blocking in IO
    while (tud_midi_available()) {
      uint8_t packet[4];
      tud_midi_packet_read(packet);
    }
  }
}

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

  while (1) {
    // Blink every interval ms
    vTaskDelay(blink_interval_ms / portTICK_PERIOD_MS);
    start_ms += blink_interval_ms;

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