feat(demo): add feedback for audio v1 speaker template

2 files changed, 108 insertions, 3 deletions

diff --git a/class/audio/usb_audio.h b/class/audio/usb_audio.h
index ff7a9fe2..1ce3d446 100644
--- a/class/audio/usb_audio.h
+++ b/class/audio/usb_audio.h
@@ -822,7 +822,66 @@ struct audio_cs_ep_ep_general_descriptor {
     0x00,                            /* wLockDelay */                                                                    \
     0x00
 
+#define AUDIO_AS_FEEDBACK_DESCRIPTOR_INIT(bInterfaceNumber, bTerminalLink, bNrChannels, bSubFrameSize, bBitResolution, bEndpointAddress, wMaxPacketSize, bInterval, bFeedbackEndpointAddress, ...) \
+    0x09,                            /* bLength */                                                                       \
+    USB_DESCRIPTOR_TYPE_INTERFACE,   /* bDescriptorType */                                                               \
+    bInterfaceNumber,                /* bInterfaceNumber */                                                              \
+    0x00,                            /* bAlternateSetting */                                                             \
+    0x00,                            /* bNumEndpoints */                                                                 \
+    USB_DEVICE_CLASS_AUDIO,          /* bInterfaceClass */                                                               \
+    AUDIO_SUBCLASS_AUDIOSTREAMING,   /* bInterfaceSubClass */                                                            \
+    AUDIO_PROTOCOL_UNDEFINED,        /* bInterfaceProtocol */                                                            \
+    0x00,                            /* iInterface */                                                                    \
+    0x09,                            /* bLength */                                                                       \
+    USB_DESCRIPTOR_TYPE_INTERFACE,   /* bDescriptorType */                                                               \
+    bInterfaceNumber,                /* bInterfaceNumber */                                                              \
+    0x01,                            /* bAlternateSetting */                                                             \
+    0x02,                            /* bNumEndpoints */                                                                 \
+    USB_DEVICE_CLASS_AUDIO,          /* bInterfaceClass */                                                               \
+    AUDIO_SUBCLASS_AUDIOSTREAMING,   /* bInterfaceSubClass */                                                            \
+    AUDIO_PROTOCOL_UNDEFINED,        /* bInterfaceProtocol */                                                            \
+    0x00,                            /* iInterface */                                                                    \
+    0x07,                            /* bLength */                                                                       \
+    AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */                                                               \
+    AUDIO_STREAMING_GENERAL,         /* bDescriptorSubtype */                                                            \
+    bTerminalLink,                   /* bTerminalLink : Unit ID of the Output Terminal*/                                 \
+    0x01,                            /* bDelay */                                                                        \
+    WBVAL(AUDIO_FORMAT_PCM),         /* wFormatTag : AUDIO_FORMAT_PCM */                                                 \
+    0x08 + PP_NARG(__VA_ARGS__),     /* bLength */                                                                       \
+    AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */                                                               \
+    AUDIO_STREAMING_FORMAT_TYPE,     /* bDescriptorSubtype */                                                            \
+    AUDIO_FORMAT_TYPE_I,             /* bFormatType */                                                                   \
+    bNrChannels,                     /* bNrChannels */                                                                   \
+    bSubFrameSize,                   /* bSubFrameSize : Bytes per audio subframe */                                      \
+    bBitResolution,                  /* bBitResolution : bits per sample */                                              \
+    (PP_NARG(__VA_ARGS__)/3),        /* bSamFreqType : only one frequency supported */                                   \
+    __VA_ARGS__,                     /* tSamFreq : Audio sampling frequency coded on 3 bytes */                          \
+    0x09,                            /* bLength */                                                                       \
+    USB_DESCRIPTOR_TYPE_ENDPOINT,    /* bDescriptorType */                                                               \
+    bEndpointAddress,                /* bEndpointAddress : IN endpoint 1 */                                              \
+    0x05,                            /* bmAttributes */                                                                  \
+    WBVAL(wMaxPacketSize),           /* wMaxPacketSize */                                                                \
+    bInterval,                       /* bInterval : one packet per frame */                                              \
+    bInterval,                       /* bRefresh */                                                                      \
+    bFeedbackEndpointAddress,        /* bSynchAddress */                                                                 \
+    0x07,                            /* bLength */                                                                       \
+    AUDIO_ENDPOINT_DESCRIPTOR_TYPE,  /* bDescriptorType */                                                               \
+    AUDIO_ENDPOINT_GENERAL,          /* bDescriptor */                                                                   \
+    AUDIO_EP_CONTROL_SAMPLING_FEQ,   /* bmAttributes AUDIO_SAMPLING_FREQ_CONTROL */                                      \
+    0x00,                            /* bLockDelayUnits */                                                               \
+    0x00,                            /* wLockDelay */                                                                    \
+    0x00,                                                                                                                \
+    0x09,                            /* bLength */                                                                       \
+    USB_DESCRIPTOR_TYPE_ENDPOINT,    /* bDescriptorType */                                                               \
+    bFeedbackEndpointAddress,        /* bFeedbackEndpointAddress Revise Dir to bEndpointAddress */                       \
+    0x11,                            /* bmAttributes: TransferType=Isochronous  SyncType=None  EndpointType=Feedback */  \
+    WBVAL(4),                        /* XXXX wMaxPacketSize in Bytes */                                                  \
+    bInterval,                       /* bInterval */                                                                     \
+    0x00,                            /* bRefresh */                                                                      \
+    0x00                             /* bSynchAddress */
+
 #define AUDIO_AS_DESCRIPTOR_INIT_LEN(n) (0x09 + 0x09 + 0x07 + 0x08 + 3 * n + 0x09 + 0x07)
+#define AUDIO_AS_FEEDBACK_DESCRIPTOR_INIT_LEN(n) (0x09 + 0x09 + 0x07 + 0x08 + 3 * n + 0x09 + 0x07 + 0x09)
 
 #define AUDIO_AS_ALTSETTING_DESCRIPTOR_INIT(bInterfaceNumber, bAlternateSetting, bTerminalLink, bNrChannels, bSubFrameSize, bBitResolution, bEndpointAddress, bmAttributes, wMaxPacketSize, bInterval, ...) \
     0x09,                            /* bLength */                                                                       \
diff --git a/demo/audio_v1_mic_speaker_multichan_template.c b/demo/audio_v1_mic_speaker_multichan_template.c
index 4beccc6b..7af6de77 100644
--- a/demo/audio_v1_mic_speaker_multichan_template.c
+++ b/demo/audio_v1_mic_speaker_multichan_template.c
@@ -6,19 +6,24 @@
 #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 EP_INTERVAL               0x04
+#define FEEDBACK_ENDP_PACKET_SIZE 0x04
 #else
-#define EP_INTERVAL 0x01
+#define EP_INTERVAL               0x01
+#define FEEDBACK_ENDP_PACKET_SIZE 0x03
 #endif
 
 #define AUDIO_IN_EP  0x81
 #define AUDIO_OUT_EP 0x02
+#define AUDIO_OUT_FEEDBACK_EP 0x83
 
 #define AUDIO_IN_FU_ID  0x02
 #define AUDIO_OUT_FU_ID 0x05
@@ -38,6 +43,7 @@
 /* 16bit(2 Bytes) 双声道(Mono:2) */
 #define AUDIO_IN_PACKET ((uint32_t)((AUDIO_MIC_FREQ * AUDIO_MIC_FRAME_SIZE_BYTE * 2) / 1000))
 
+#if USING_FEEDBACK == 0
 #define USB_AUDIO_CONFIG_DESC_SIZ (unsigned long)(9 +                                       \
                                                   AUDIO_AC_DESCRIPTOR_INIT_LEN(2) +         \
                                                   AUDIO_SIZEOF_AC_INPUT_TERMINAL_DESC +     \
@@ -48,6 +54,18 @@
                                                   AUDIO_SIZEOF_AC_OUTPUT_TERMINAL_DESC +    \
                                                   AUDIO_AS_DESCRIPTOR_INIT_LEN(1) +         \
                                                   AUDIO_AS_DESCRIPTOR_INIT_LEN(1))
+#else
+#define USB_AUDIO_CONFIG_DESC_SIZ (unsigned long)(9 +                                       \
+                                                  AUDIO_AC_DESCRIPTOR_INIT_LEN(2) +         \
+                                                  AUDIO_SIZEOF_AC_INPUT_TERMINAL_DESC +     \
+                                                  AUDIO_SIZEOF_AC_FEATURE_UNIT_DESC(2, 1) + \
+                                                  AUDIO_SIZEOF_AC_OUTPUT_TERMINAL_DESC +    \
+                                                  AUDIO_SIZEOF_AC_INPUT_TERMINAL_DESC +     \
+                                                  AUDIO_SIZEOF_AC_FEATURE_UNIT_DESC(2, 1) + \
+                                                  AUDIO_SIZEOF_AC_OUTPUT_TERMINAL_DESC +    \
+                                                  AUDIO_AS_DESCRIPTOR_INIT_LEN(1) +         \
+                                                  AUDIO_AS_FEEDBACK_DESCRIPTOR_INIT_LEN(1))
+#endif
 
 #define AUDIO_AC_SIZ (AUDIO_SIZEOF_AC_HEADER_DESC(2) +          \
                       AUDIO_SIZEOF_AC_INPUT_TERMINAL_DESC +     \
@@ -67,8 +85,13 @@ const uint8_t audio_v1_descriptor[] = {
     AUDIO_AC_INPUT_TERMINAL_DESCRIPTOR_INIT(0x04, AUDIO_TERMINAL_STREAMING, 0x02, 0x0003),
     AUDIO_AC_FEATURE_UNIT_DESCRIPTOR_INIT(0x05, 0x04, 0x01, 0x03, 0x00, 0x00),
     AUDIO_AC_OUTPUT_TERMINAL_DESCRIPTOR_INIT(0x06, AUDIO_OUTTERM_SPEAKER, 0x05),
+#if USING_FEEDBACK == 0
     AUDIO_AS_DESCRIPTOR_INIT(0x01, 0x04, 0x02, AUDIO_SPEAKER_FRAME_SIZE_BYTE, AUDIO_SPEAKER_RESOLUTION_BIT, AUDIO_OUT_EP, 0x09, AUDIO_OUT_PACKET,
                              EP_INTERVAL, AUDIO_SAMPLE_FREQ_3B(AUDIO_SPEAKER_FREQ)),
+#else
+    AUDIO_AS_FEEDBACK_DESCRIPTOR_INIT(0x01, 0x04, 0x02, AUDIO_SPEAKER_FRAME_SIZE_BYTE, AUDIO_SPEAKER_RESOLUTION_BIT, AUDIO_OUT_EP, AUDIO_OUT_PACKET,
+                             EP_INTERVAL, AUDIO_OUT_FEEDBACK_EP, AUDIO_SAMPLE_FREQ_3B(AUDIO_SPEAKER_FREQ)),
+#endif
     AUDIO_AS_DESCRIPTOR_INIT(0x02, 0x03, 0x02, AUDIO_MIC_FRAME_SIZE_BYTE, AUDIO_MIC_RESOLUTION_BIT, AUDIO_IN_EP, 0x05, AUDIO_IN_PACKET,
                              EP_INTERVAL, AUDIO_SAMPLE_FREQ_3B(AUDIO_MIC_FREQ)),
     ///////////////////////////////////////
@@ -126,7 +149,11 @@ const uint8_t audio_v1_descriptor[] = {
     '1', 0x00,                  /* wcChar6 */
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
+#if USING_FEEDBACK == 0
     '1', 0x00,                  /* wcChar9 */
+#else
+    '2', 0x00,                  /* wcChar9 */
+#endif
 #ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
@@ -147,6 +174,7 @@ const uint8_t audio_v1_descriptor[] = {
 
 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];
+USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t s_speaker_feedback_buffer[4];
 
 volatile bool tx_flag = 0;
 volatile bool rx_flag = 0;
@@ -183,6 +211,7 @@ void usbd_audio_open(uint8_t busid, uint8_t intf)
         rx_flag = 1;
         /* setup first out ep read transfer */
         usbd_ep_start_read(busid, AUDIO_OUT_EP, read_buffer, AUDIO_OUT_PACKET);
+        usbd_ep_start_write(busid, AUDIO_OUT_FEEDBACK_EP, s_speaker_feedback_buffer, FEEDBACK_ENDP_PACKET_SIZE);
         printf("OPEN1\r\n");
     } else {
         tx_flag = 1;
@@ -215,6 +244,14 @@ void usbd_audio_in_callback(uint8_t busid, uint8_t ep, uint32_t 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);
+    usbd_ep_start_write(busid, AUDIO_OUT_FEEDBACK_EP, s_speaker_feedback_buffer, FEEDBACK_ENDP_PACKET_SIZE);
+}
+#endif
+
 static struct usbd_endpoint audio_in_ep = {
     .ep_cb = usbd_audio_in_callback,
     .ep_addr = AUDIO_IN_EP
@@ -225,6 +262,13 @@ static struct usbd_endpoint audio_out_ep = {
     .ep_addr = AUDIO_OUT_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;
@@ -246,7 +290,9 @@ void audio_v1_init(uint8_t busid, uintptr_t reg_base)
     usbd_add_interface(busid, usbd_audio_init_intf(busid, &intf2, 0x0100, audio_entity_table, 2));
     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);
 }