1 /*
2 * Copyright (c) 2020 Nordic Semiconductor ASA
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 /**
8 * @file
9 * @brief Sample app for Audio class
10 */
11
12 #include <zephyr/kernel.h>
13 #include <zephyr/logging/log.h>
14 #include <zephyr/usb/usb_device.h>
15 #include <zephyr/usb/class/usb_audio.h>
16
17 LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
18
19 static const struct device *const mic_dev = DEVICE_DT_GET_ONE(usb_audio_mic);
20
data_received(const struct device * dev,struct net_buf * buffer,size_t size)21 static void data_received(const struct device *dev,
22 struct net_buf *buffer,
23 size_t size)
24 {
25 int ret;
26
27 if (!buffer || !size) {
28 /* This should never happen */
29 return;
30 }
31
32 LOG_DBG("Received %d data, buffer %p", size, buffer);
33
34 /* Check if OUT device buffer can be used for IN device */
35 if (size == usb_audio_get_in_frame_size(mic_dev)) {
36 ret = usb_audio_send(mic_dev, buffer, size);
37 if (ret) {
38 net_buf_unref(buffer);
39 }
40 } else {
41 net_buf_unref(buffer);
42 }
43 }
44
feature_update(const struct device * dev,const struct usb_audio_fu_evt * evt)45 static void feature_update(const struct device *dev,
46 const struct usb_audio_fu_evt *evt)
47 {
48 int16_t volume = 0;
49
50 LOG_DBG("Control selector %d for channel %d updated",
51 evt->cs, evt->channel);
52 switch (evt->cs) {
53 case USB_AUDIO_FU_MUTE_CONTROL:
54 break;
55 case USB_AUDIO_FU_VOLUME_CONTROL:
56 volume = UNALIGNED_GET((int16_t *)evt->val);
57 LOG_INF("set volume: %d", volume);
58 break;
59 default:
60 break;
61 }
62 }
63
64 static const struct usb_audio_ops hp_ops = {
65 .data_received_cb = data_received,
66 .feature_update_cb = feature_update,
67 };
68
69 static const struct usb_audio_ops mic_ops = {
70 .feature_update_cb = feature_update,
71 };
72
main(void)73 int main(void)
74 {
75 const struct device *const hp_dev = DEVICE_DT_GET_ONE(usb_audio_hp);
76 int ret;
77
78 LOG_INF("Entered %s", __func__);
79
80 if (!device_is_ready(hp_dev)) {
81 LOG_ERR("Device USB Headphones is not ready");
82 return 0;
83 }
84
85 LOG_INF("Found USB Headphones Device");
86
87 if (!device_is_ready(mic_dev)) {
88 LOG_ERR("Device USB Microphone is not ready");
89 return 0;
90 }
91
92 LOG_INF("Found USB Microphone Device");
93
94 usb_audio_register(hp_dev, &hp_ops);
95
96 usb_audio_register(mic_dev, &mic_ops);
97
98 ret = usb_enable(NULL);
99 if (ret != 0) {
100 LOG_ERR("Failed to enable USB");
101 return 0;
102 }
103
104 LOG_INF("USB enabled");
105 return 0;
106 }
107
