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
data_received(const struct device * dev,struct net_buf * buffer,size_t size)19 static void data_received(const struct device *dev,
20 struct net_buf *buffer,
21 size_t size)
22 {
23 int ret;
24
25 if (!buffer || !size) {
26 /* This should never happen */
27 return;
28 }
29
30 LOG_DBG("Received %d data, buffer %p", size, buffer);
31
32 /* Check if the device OUT buffer can be used for input */
33 if (size == usb_audio_get_in_frame_size(dev)) {
34 ret = usb_audio_send(dev, buffer, size);
35 if (ret) {
36 net_buf_unref(buffer);
37 }
38 } else {
39 net_buf_unref(buffer);
40 }
41 }
42
feature_update(const struct device * dev,const struct usb_audio_fu_evt * evt)43 static void feature_update(const struct device *dev,
44 const struct usb_audio_fu_evt *evt)
45 {
46 int16_t volume = 0;
47
48 LOG_DBG("Control selector %d for channel %d updated",
49 evt->cs, evt->channel);
50 switch (evt->cs) {
51 case USB_AUDIO_FU_MUTE_CONTROL:
52 break;
53 case USB_AUDIO_FU_VOLUME_CONTROL:
54 volume = UNALIGNED_GET((int16_t *)evt->val);
55 LOG_INF("set volume: %d", volume);
56 break;
57 default:
58 break;
59 }
60 }
61
62 static const struct usb_audio_ops ops = {
63 .data_received_cb = data_received,
64 .feature_update_cb = feature_update,
65 };
66
main(void)67 int main(void)
68 {
69 const struct device *hs_dev;
70 int ret;
71
72 LOG_INF("Entered %s", __func__);
73 hs_dev = DEVICE_DT_GET_ONE(usb_audio_hs);
74
75 if (!device_is_ready(hs_dev)) {
76 LOG_ERR("Device USB Headset is not ready");
77 return 0;
78 }
79
80 LOG_INF("Found USB Headset Device");
81
82 usb_audio_register(hs_dev, &ops);
83
84 ret = usb_enable(NULL);
85 if (ret != 0) {
86 LOG_ERR("Failed to enable USB");
87 return 0;
88 }
89
90 LOG_INF("USB enabled");
91 return 0;
92 }
93
