CherryUSB/demo/audio_v2_mic_speaker_multichan_template.c

/*
 * Copyright (c) 2024, sakumisu
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "usbd_core.h"
#include "usbd_audio.h"

#define USBD_VID           0xffff
#define USBD_PID           0xffff
#define USBD_MAX_POWER     100
#define USBD_LANGID_STRING 1033

#ifdef CONFIG_USB_HS
#define EP_INTERVAL 0x04
#else
#define EP_INTERVAL 0x01
#endif

#define AUDIO_OUT_EP 0x02
#define AUDIO_IN_EP  0x81

#define AUDIO_OUT_CLOCK_ID 0x01
#define AUDIO_OUT_FU_ID    0x03
#define AUDIO_IN_CLOCK_ID  0x05
#define AUDIO_IN_FU_ID     0x07

#define AUDIO_FREQ      48000
#define HALF_WORD_BYTES 2  //2 half word (one channel)
#define SAMPLE_BITS     16 //16 bit per channel

#define BMCONTROL (AUDIO_V2_FU_CONTROL_MUTE | AUDIO_V2_FU_CONTROL_VOLUME)

#define IN_CHANNEL_NUM 2

#if IN_CHANNEL_NUM == 1
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x00000000
#elif IN_CHANNEL_NUM == 2
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x00000003
#elif IN_CHANNEL_NUM == 3
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x00000007
#elif IN_CHANNEL_NUM == 4
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x0000000f
#elif IN_CHANNEL_NUM == 5
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x0000001f
#elif IN_CHANNEL_NUM == 6
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x0000003F
#elif IN_CHANNEL_NUM == 7
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x0000007f
#elif IN_CHANNEL_NUM == 8
#define INPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x000000ff
#endif

#define OUT_CHANNEL_NUM 2

#if OUT_CHANNEL_NUM == 1
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x00000000
#elif OUT_CHANNEL_NUM == 2
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x00000003
#elif OUT_CHANNEL_NUM == 3
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x00000007
#elif OUT_CHANNEL_NUM == 4
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x0000000f
#elif OUT_CHANNEL_NUM == 5
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x0000001f
#elif OUT_CHANNEL_NUM == 6
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x0000003F
#elif OUT_CHANNEL_NUM == 7
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x0000007f
#elif OUT_CHANNEL_NUM == 8
#define OUTPUT_CTRL      DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define OUTPUT_CH_ENABLE 0x000000ff
#endif

/* AudioFreq * DataSize (2 bytes) * NumChannels */
#define AUDIO_OUT_PACKET ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * OUT_CHANNEL_NUM) / 1000))
#define AUDIO_IN_PACKET  ((uint32_t)((AUDIO_FREQ * HALF_WORD_BYTES * IN_CHANNEL_NUM) / 1000))

#define USB_AUDIO_CONFIG_DESC_SIZ (9 +                                                     \
                                   AUDIO_V2_AC_DESCRIPTOR_INIT_LEN +                       \
                                   AUDIO_V2_SIZEOF_AC_CLOCK_SOURCE_DESC +                  \
                                   AUDIO_V2_SIZEOF_AC_INPUT_TERMINAL_DESC +                \
                                   AUDIO_V2_SIZEOF_AC_FEATURE_UNIT_DESC(OUT_CHANNEL_NUM) + \
                                   AUDIO_V2_SIZEOF_AC_OUTPUT_TERMINAL_DESC +               \
                                   AUDIO_V2_SIZEOF_AC_CLOCK_SOURCE_DESC +                  \
                                   AUDIO_V2_SIZEOF_AC_INPUT_TERMINAL_DESC +                \
                                   AUDIO_V2_SIZEOF_AC_FEATURE_UNIT_DESC(IN_CHANNEL_NUM) +  \
                                   AUDIO_V2_SIZEOF_AC_OUTPUT_TERMINAL_DESC +               \
                                   AUDIO_V2_AS_DESCRIPTOR_INIT_LEN +                       \
                                   AUDIO_V2_AS_DESCRIPTOR_INIT_LEN)

#define AUDIO_AC_SIZ (AUDIO_V2_SIZEOF_AC_HEADER_DESC +                        \
                      AUDIO_V2_SIZEOF_AC_CLOCK_SOURCE_DESC +                  \
                      AUDIO_V2_SIZEOF_AC_INPUT_TERMINAL_DESC +                \
                      AUDIO_V2_SIZEOF_AC_FEATURE_UNIT_DESC(OUT_CHANNEL_NUM) + \
                      AUDIO_V2_SIZEOF_AC_OUTPUT_TERMINAL_DESC +               \
                      AUDIO_V2_SIZEOF_AC_CLOCK_SOURCE_DESC +                  \
                      AUDIO_V2_SIZEOF_AC_INPUT_TERMINAL_DESC +                \
                      AUDIO_V2_SIZEOF_AC_FEATURE_UNIT_DESC(IN_CHANNEL_NUM) +  \
                      AUDIO_V2_SIZEOF_AC_OUTPUT_TERMINAL_DESC)

#ifdef CONFIG_USBDEV_ADVANCE_DESC
static const uint8_t device_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0x00, 0x00, 0x00, USBD_VID, USBD_PID, 0x0001, 0x01)
};

static const uint8_t config_descriptor[] = {
    USB_CONFIG_DESCRIPTOR_INIT(USB_AUDIO_CONFIG_DESC_SIZ, 0x03, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    AUDIO_V2_AC_DESCRIPTOR_INIT(0x00, 0x03, AUDIO_AC_SIZ, AUDIO_CATEGORY_UNDEF, 0x00, 0x00),
    AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(0x01, 0x03, 0x03),
    AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x02, AUDIO_TERMINAL_STREAMING, 0x01, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, 0x0000),
    AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(0x03, 0x02, OUTPUT_CTRL),
    AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x04, AUDIO_OUTTERM_SPEAKER, 0x03, 0x01, 0x0000),
    AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(0x05, 0x03, 0x03),
    AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x06, AUDIO_INTERM_MIC, 0x05, IN_CHANNEL_NUM, INPUT_CH_ENABLE, 0x0000),
    AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(0x07, 0x06, INPUT_CTRL),
    AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x08, AUDIO_TERMINAL_STREAMING, 0x07, 0x05, 0x0000),
    AUDIO_V2_AS_DESCRIPTOR_INIT(0x01, 0x02, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, HALF_WORD_BYTES, SAMPLE_BITS, AUDIO_OUT_EP, 0x09, AUDIO_OUT_PACKET, EP_INTERVAL),
    AUDIO_V2_AS_DESCRIPTOR_INIT(0x02, 0x08, IN_CHANNEL_NUM, INPUT_CH_ENABLE, HALF_WORD_BYTES, SAMPLE_BITS, AUDIO_IN_EP, 0x05, (AUDIO_IN_PACKET + 4), EP_INTERVAL)
};

static const uint8_t device_quality_descriptor[] = {
    ///////////////////////////////////////
    /// device qualifier descriptor
    ///////////////////////////////////////
    0x0a,
    USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x00,
    0x00,
    0x00,
    0x40,
    0x00,
    0x00,
};

static const char *string_descriptors[] = {
    (const char[]){ 0x09, 0x04 }, /* Langid */
    "CherryUSB",                  /* Manufacturer */
    "CherryUSB UAC DEMO",         /* Product */
    "2022123456",                 /* Serial Number */
};

static const uint8_t *device_descriptor_callback(uint8_t speed)
{
    return device_descriptor;
}

static const uint8_t *config_descriptor_callback(uint8_t speed)
{
    return config_descriptor;
}

static const uint8_t *device_quality_descriptor_callback(uint8_t speed)
{
    return device_quality_descriptor;
}

static const char *string_descriptor_callback(uint8_t speed, uint8_t index)
{
    if (index > 3) {
        return NULL;
    }
    return string_descriptors[index];
}

const struct usb_descriptor audio_v2_descriptor = {
    .device_descriptor_callback = device_descriptor_callback,
    .config_descriptor_callback = config_descriptor_callback,
    .device_quality_descriptor_callback = device_quality_descriptor_callback,
    .string_descriptor_callback = string_descriptor_callback
};
#else
uint8_t audio_v2_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0x00, 0x00, 0x00, USBD_VID, USBD_PID, 0x0001, 0x01),
    USB_CONFIG_DESCRIPTOR_INIT(USB_AUDIO_CONFIG_DESC_SIZ, 0x03, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    AUDIO_V2_AC_DESCRIPTOR_INIT(0x00, 0x03, AUDIO_AC_SIZ, AUDIO_CATEGORY_UNDEF, 0x00, 0x00),
    AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(0x01, 0x03, 0x03),
    AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x02, AUDIO_TERMINAL_STREAMING, 0x01, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, 0x0000),
    AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(0x03, 0x02, OUTPUT_CTRL),
    AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x04, AUDIO_OUTTERM_SPEAKER, 0x03, 0x01, 0x0000),
    AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(0x05, 0x03, 0x03),
    AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x06, AUDIO_INTERM_MIC, 0x05, IN_CHANNEL_NUM, INPUT_CH_ENABLE, 0x0000),
    AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(0x07, 0x06, INPUT_CTRL),
    AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x08, AUDIO_TERMINAL_STREAMING, 0x07, 0x05, 0x0000),
    AUDIO_V2_AS_DESCRIPTOR_INIT(0x01, 0x02, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, HALF_WORD_BYTES, SAMPLE_BITS, AUDIO_OUT_EP, 0x09, AUDIO_OUT_PACKET, EP_INTERVAL),
    AUDIO_V2_AS_DESCRIPTOR_INIT(0x02, 0x08, IN_CHANNEL_NUM, INPUT_CH_ENABLE, HALF_WORD_BYTES, SAMPLE_BITS, AUDIO_IN_EP, 0x05, (AUDIO_IN_PACKET + 4), EP_INTERVAL),
    ///////////////////////////////////////
    /// string0 descriptor
    ///////////////////////////////////////
    USB_LANGID_INIT(USBD_LANGID_STRING),
    ///////////////////////////////////////
    /// string1 descriptor
    ///////////////////////////////////////
    0x14,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'C', 0x00,                  /* wcChar0 */
    'h', 0x00,                  /* wcChar1 */
    'e', 0x00,                  /* wcChar2 */
    'r', 0x00,                  /* wcChar3 */
    'r', 0x00,                  /* wcChar4 */
    'y', 0x00,                  /* wcChar5 */
    'U', 0x00,                  /* wcChar6 */
    'S', 0x00,                  /* wcChar7 */
    'B', 0x00,                  /* wcChar8 */
    ///////////////////////////////////////
    /// string2 descriptor
    ///////////////////////////////////////
    0x26,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'C', 0x00,                  /* wcChar0 */
    'h', 0x00,                  /* wcChar1 */
    'e', 0x00,                  /* wcChar2 */
    'r', 0x00,                  /* wcChar3 */
    'r', 0x00,                  /* wcChar4 */
    'y', 0x00,                  /* wcChar5 */
    'U', 0x00,                  /* wcChar6 */
    'S', 0x00,                  /* wcChar7 */
    'B', 0x00,                  /* wcChar8 */
    ' ', 0x00,                  /* wcChar9 */
    'U', 0x00,                  /* wcChar10 */
    'A', 0x00,                  /* wcChar11 */
    'C', 0x00,                  /* wcChar12 */
    ' ', 0x00,                  /* wcChar13 */
    'D', 0x00,                  /* wcChar14 */
    'E', 0x00,                  /* wcChar15 */
    'M', 0x00,                  /* wcChar16 */
    'O', 0x00,                  /* wcChar17 */
    ///////////////////////////////////////
    /// string3 descriptor
    ///////////////////////////////////////
    0x16,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    '2', 0x00,                  /* wcChar0 */
    '0', 0x00,                  /* wcChar1 */
    '2', 0x00,                  /* wcChar2 */
    '1', 0x00,                  /* wcChar3 */
    '0', 0x00,                  /* wcChar4 */
    '3', 0x00,                  /* wcChar5 */
    '1', 0x00,                  /* wcChar6 */
    '0', 0x00,                  /* wcChar7 */
    '0', 0x00,                  /* wcChar8 */
    '5', 0x00,                  /* wcChar9 */
#ifdef CONFIG_USB_HS
    ///////////////////////////////////////
    /// device qualifier descriptor
    ///////////////////////////////////////
    0x0a,
    USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x00,
    0x00,
    0x00,
    0x40,
    0x00,
    0x00,
#endif
    0x00
};
#endif

static const uint8_t speaker_default_sampling_freq_table[] = {
    AUDIO_SAMPLE_FREQ_NUM(5),
    AUDIO_SAMPLE_FREQ_4B(8000),
    AUDIO_SAMPLE_FREQ_4B(8000),
    AUDIO_SAMPLE_FREQ_4B(0x00),
    AUDIO_SAMPLE_FREQ_4B(16000),
    AUDIO_SAMPLE_FREQ_4B(16000),
    AUDIO_SAMPLE_FREQ_4B(0x00),
    AUDIO_SAMPLE_FREQ_4B(32000),
    AUDIO_SAMPLE_FREQ_4B(32000),
    AUDIO_SAMPLE_FREQ_4B(0x00),
    AUDIO_SAMPLE_FREQ_4B(48000),
    AUDIO_SAMPLE_FREQ_4B(48000),
    AUDIO_SAMPLE_FREQ_4B(0x00),
    AUDIO_SAMPLE_FREQ_4B(96000),
    AUDIO_SAMPLE_FREQ_4B(96000),
    AUDIO_SAMPLE_FREQ_4B(0x00)
};

static const uint8_t mic_default_sampling_freq_table[] = {
    AUDIO_SAMPLE_FREQ_NUM(1),
    AUDIO_SAMPLE_FREQ_4B(16000),
    AUDIO_SAMPLE_FREQ_4B(16000),
    AUDIO_SAMPLE_FREQ_4B(0x00)
};

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t read_buffer[AUDIO_OUT_PACKET];
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[AUDIO_IN_PACKET];

volatile bool tx_flag = 0;
volatile bool rx_flag = 0;
volatile bool ep_tx_busy_flag = false;

static void usbd_event_handler(uint8_t busid, uint8_t event)
{
    switch (event) {
        case USBD_EVENT_RESET:
            break;
        case USBD_EVENT_CONNECTED:
            break;
        case USBD_EVENT_DISCONNECTED:
            break;
        case USBD_EVENT_RESUME:
            break;
        case USBD_EVENT_SUSPEND:
            break;
        case USBD_EVENT_CONFIGURED:
            break;
        case USBD_EVENT_SET_REMOTE_WAKEUP:
            break;
        case USBD_EVENT_CLR_REMOTE_WAKEUP:
            break;

        default:
            break;
    }
}

void usbd_audio_open(uint8_t busid, uint8_t intf)
{
    if (intf == 1) {
        rx_flag = 1;
        /* setup first out ep read transfer */
        usbd_ep_start_read(busid, AUDIO_OUT_EP, read_buffer, AUDIO_OUT_PACKET);
        USB_LOG_RAW("OPEN1\r\n");
    } else {
        tx_flag = 1;
        USB_LOG_RAW("OPEN2\r\n");
    }
}

void usbd_audio_close(uint8_t busid, uint8_t intf)
{
    if (intf == 1) {
        rx_flag = 0;
        USB_LOG_RAW("CLOSE1\r\n");
    } else {
        tx_flag = 0;
        USB_LOG_RAW("CLOSE2\r\n");
    }
}

void usbd_audio_get_sampling_freq_table(uint8_t busid, uint8_t ep, uint8_t **sampling_freq_table)
{
    if (ep == AUDIO_OUT_EP) {
        *sampling_freq_table = (uint8_t *)speaker_default_sampling_freq_table;
    } else if (ep == AUDIO_IN_EP) {
        *sampling_freq_table = (uint8_t *)mic_default_sampling_freq_table;
    } else {
    }
}

void usbd_audio_iso_out_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    USB_LOG_RAW("actual out len:%d\r\n", (unsigned int)nbytes);
    usbd_ep_start_read(busid, AUDIO_OUT_EP, read_buffer, AUDIO_OUT_PACKET);
}

void usbd_audio_iso_in_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
}

static struct usbd_endpoint audio_out_ep = {
    .ep_cb = usbd_audio_iso_out_callback,
    .ep_addr = AUDIO_OUT_EP
};

static struct usbd_endpoint audio_in_ep = {
    .ep_cb = usbd_audio_iso_in_callback,
    .ep_addr = AUDIO_IN_EP
};

struct usbd_interface intf0;
struct usbd_interface intf1;
struct usbd_interface intf2;

struct audio_entity_info audio_entity_table[] = {
    { .bEntityId = AUDIO_OUT_CLOCK_ID,
      .bDescriptorSubtype = AUDIO_CONTROL_CLOCK_SOURCE,
      .ep = AUDIO_OUT_EP },
    { .bEntityId = AUDIO_OUT_FU_ID,
      .bDescriptorSubtype = AUDIO_CONTROL_FEATURE_UNIT,
      .ep = AUDIO_OUT_EP },
    { .bEntityId = AUDIO_IN_CLOCK_ID,
      .bDescriptorSubtype = AUDIO_CONTROL_CLOCK_SOURCE,
      .ep = AUDIO_IN_EP },
    { .bEntityId = AUDIO_IN_FU_ID,
      .bDescriptorSubtype = AUDIO_CONTROL_FEATURE_UNIT,
      .ep = AUDIO_IN_EP },
};

void audio_v2_init(uint8_t busid, uintptr_t reg_base)
{
#ifdef CONFIG_USBDEV_ADVANCE_DESC
    usbd_desc_register(busid, &audio_v2_descriptor);
#else
    usbd_desc_register(busid, audio_v2_descriptor);
#endif
    usbd_add_interface(busid, usbd_audio_init_intf(busid, &intf0, 0x0200, audio_entity_table, 4));
    usbd_add_interface(busid, usbd_audio_init_intf(busid, &intf1, 0x0200, audio_entity_table, 4));
    usbd_add_interface(busid, usbd_audio_init_intf(busid, &intf2, 0x0200, audio_entity_table, 4));
    usbd_add_endpoint(busid, &audio_in_ep);
    usbd_add_endpoint(busid, &audio_out_ep);

    usbd_initialize(busid, reg_base, usbd_event_handler);
}

void audio_v2_test(uint8_t busid)
{
    if (tx_flag) {
        memset(write_buffer, 'a', AUDIO_IN_PACKET);
        ep_tx_busy_flag = true;
        usbd_ep_start_write(busid, AUDIO_IN_EP, write_buffer, AUDIO_IN_PACKET);
        while (ep_tx_busy_flag) {
            if (tx_flag == false) {
                break;
            }
        }
    }
    if (rx_flag) {
    }
}