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/*
* Copyright (c) 2024, sakumisu
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "usbd_core.h"
#include "usbd_audio.h"
#define USING_FEEDBACK 0
#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
#define FEEDBACK_ENDP_PACKET_SIZE 0x04
#else
#define EP_INTERVAL 0x01
#define FEEDBACK_ENDP_PACKET_SIZE 0x04
#endif
#define AUDIO_OUT_EP 0x02
#define AUDIO_IN_EP 0x81
#define AUDIO_OUT_FEEDBACK_EP 0x83
#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_OUT_MAX_FREQ 96000
#define AUDIO_SPEAKER_FRAME_SIZE_BYTE 2u
#define AUDIO_SPEAKER_RESOLUTION_BIT 16u
#define AUDIO_IN_MAX_FREQ 96000
#define AUDIO_MIC_FRAME_SIZE_BYTE 2u
#define AUDIO_MIC_RESOLUTION_BIT 16u
#define BMCONTROL (AUDIO_V2_CONTROL_MUTE | AUDIO_V2_CONTROL_VOLUME)
#define IN_CHANNEL_NUM 2
#if IN_CHANNEL_NUM == 1
#define INPUT_CTRL DBVAL(BMCONTROL), DBVAL(BMCONTROL)
#define INPUT_CH_ENABLE 0x00000001
#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 0x00000001
#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_OUT_MAX_FREQ * AUDIO_SPEAKER_FRAME_SIZE_BYTE * OUT_CHANNEL_NUM) / 1000))
#define AUDIO_IN_PACKET ((uint32_t)((AUDIO_IN_MAX_FREQ * AUDIO_MIC_FRAME_SIZE_BYTE * IN_CHANNEL_NUM) / 1000))
#if USING_FEEDBACK == 0
#define USB_CONFIG_SIZE (9 + \
AUDIO_V2_AC_DESCRIPTOR_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_LEN + \
AUDIO_V2_AS_DESCRIPTOR_LEN)
#else
#define USB_CONFIG_SIZE (9 + \
AUDIO_V2_AC_DESCRIPTOR_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_FEEDBACK_DESCRIPTOR_LEN + \
AUDIO_V2_AS_DESCRIPTOR_LEN)
#endif
#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)
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_CONFIG_SIZE, 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(AUDIO_OUT_CLOCK_ID, 0x03, 0x03),
AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x02, AUDIO_TERMINAL_STREAMING, AUDIO_OUT_CLOCK_ID, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, 0x0000),
AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(AUDIO_OUT_FU_ID, 0x02, OUTPUT_CTRL),
AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x04, AUDIO_OUTTERM_SPEAKER, AUDIO_OUT_FU_ID, AUDIO_OUT_CLOCK_ID, 0x0000),
AUDIO_V2_AC_CLOCK_SOURCE_DESCRIPTOR_INIT(AUDIO_IN_CLOCK_ID, 0x03, 0x03),
AUDIO_V2_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x06, AUDIO_INTERM_MIC, AUDIO_IN_CLOCK_ID, IN_CHANNEL_NUM, INPUT_CH_ENABLE, 0x0000),
AUDIO_V2_AC_FEATURE_UNIT_DESCRIPTOR_INIT(AUDIO_IN_FU_ID, 0x06, INPUT_CTRL),
AUDIO_V2_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x08, AUDIO_TERMINAL_STREAMING, AUDIO_IN_FU_ID, AUDIO_IN_CLOCK_ID, 0x0000),
#if USING_FEEDBACK == 0
AUDIO_V2_AS_DESCRIPTOR_INIT(0x01, 0x02, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, AUDIO_SPEAKER_FRAME_SIZE_BYTE, AUDIO_SPEAKER_RESOLUTION_BIT, AUDIO_OUT_EP, 0x09, AUDIO_OUT_PACKET, EP_INTERVAL),
#else
AUDIO_V2_AS_FEEDBACK_DESCRIPTOR_INIT(0x01, 0x02, OUT_CHANNEL_NUM, OUTPUT_CH_ENABLE, AUDIO_SPEAKER_FRAME_SIZE_BYTE, AUDIO_SPEAKER_RESOLUTION_BIT, AUDIO_OUT_EP, 0x09, AUDIO_OUT_PACKET, EP_INTERVAL, AUDIO_OUT_FEEDBACK_EP),
#endif
AUDIO_V2_AS_DESCRIPTOR_INIT(0x02, 0x08, IN_CHANNEL_NUM, INPUT_CH_ENABLE, AUDIO_MIC_FRAME_SIZE_BYTE, AUDIO_MIC_RESOLUTION_BIT, 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 >= (sizeof(string_descriptors) / sizeof(char *))) {
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
};
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(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)
};
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;
volatile uint32_t s_mic_sample_rate;
volatile uint32_t s_speaker_sample_rate;
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);
#if USING_FEEDBACK == 1
#ifdef CONFIG_USB_HS
uint32_t feedback_value = AUDIO_FREQ_TO_FEEDBACK_HS(AUDIO_FREQ);
AUDIO_FEEDBACK_TO_BUF_HS(s_speaker_feedback_buffer, feedback_value);
#else
uint32_t feedback_value = AUDIO_FREQ_TO_FEEDBACK_FS(AUDIO_FREQ);
AUDIO_FEEDBACK_TO_BUF_FS(s_speaker_feedback_buffer, feedback_value);
#endif
usbd_ep_start_write(busid, AUDIO_OUT_FEEDBACK_EP, s_speaker_feedback_buffer, FEEDBACK_ENDP_PACKET_SIZE);
#endif
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_set_sampling_freq(uint8_t busid, uint8_t ep, uint32_t sampling_freq)
{
if (ep == AUDIO_OUT_EP) {
s_speaker_sample_rate = sampling_freq;
} else if (ep == AUDIO_IN_EP) {
s_mic_sample_rate = sampling_freq;
}
}
uint32_t usbd_audio_get_sampling_freq(uint8_t busid, uint8_t ep)
{
(void)busid;
uint32_t freq = 0;
if (ep == AUDIO_OUT_EP) {
freq = s_speaker_sample_rate;
} else if (ep == AUDIO_IN_EP) {
freq = s_mic_sample_rate;
}
return freq;
}
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)
{
USB_LOG_RAW("actual in len:%d\r\n", (unsigned int)nbytes);
ep_tx_busy_flag = false;
}
#if USING_FEEDBACK == 1
void usbd_audio_iso_out_feedback_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
USB_LOG_RAW("actual feedback len:%d\r\n", nbytes);
#ifdef CONFIG_USB_HS
uint32_t feedback_value = AUDIO_FREQ_TO_FEEDBACK_HS(s_speaker_sample_rate);
AUDIO_FEEDBACK_TO_BUF_HS(s_speaker_feedback_buffer, feedback_value);
#else
uint32_t feedback_value = AUDIO_FREQ_TO_FEEDBACK_FS(s_speaker_sample_rate);
AUDIO_FEEDBACK_TO_BUF_FS(s_speaker_feedback_buffer, feedback_value);
#endif
usbd_ep_start_write(busid, AUDIO_OUT_FEEDBACK_EP, s_speaker_feedback_buffer, FEEDBACK_ENDP_PACKET_SIZE);
}
#endif
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
};
#if USING_FEEDBACK == 1
static struct usbd_endpoint audio_out_feedback_ep = {
.ep_cb = usbd_audio_iso_out_feedback_callback,
.ep_addr = AUDIO_OUT_FEEDBACK_EP
};
#endif
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 },
};
// In windows, audio driver cannot remove auto, so when you modify any descriptor information, please modify string descriptors too.
void audio_v2_init(uint8_t busid, uintptr_t reg_base)
{
usbd_desc_register(busid, &audio_v2_descriptor);
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);
#if USING_FEEDBACK == 1
usbd_add_endpoint(busid, &audio_out_feedback_ep);
#endif
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) {
}
}
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