基于Raspberry Pi Pico的TinyUSB CDC+UAC2复合设备故障求助

我需要制作一款包含双串口（CDC）与UAC2声卡端点的USB设备，采用Raspberry Pi Pico搭配TinyUSB库实现。已将dual_cdc示例与uac2_headset示例合并到example_cdc_uac2分支的cdc_uac文件夹中，代码可编译且能被主机识别，但无法正常工作——两个示例单独运行均无问题。

关键代码片段 #

enum
{
  ITF_NUM_CDC_0 = 0,
  ITF_NUM_CDC_0_DATA,
  ITF_NUM_CDC_1,
  ITF_NUM_CDC_1_DATA,
  ITF_NUM_AUDIO_CONTROL,       // FIXME: I have added here the AUDIO ITFs. Is it something wrong?
  ITF_NUM_AUDIO_STREAMING_SPK,
  ITF_NUM_AUDIO_STREAMING_MIC,
  ITF_NUM_TOTAL
};

#define EPNUM_CDC_0_NOTIF   0x81
#define EPNUM_CDC_0_OUT     0x02
#define EPNUM_CDC_0_IN      0x82

#define EPNUM_CDC_1_NOTIF   0x83
#define EPNUM_CDC_1_OUT     0x04
#define EPNUM_CDC_1_IN      0x84

#define EPNUM_AUDIO_OUT     0x01
#define EPNUM_AUDIO_IN      0x81

uint8_t const desc_fs_configuration[] =
{
  // Config number, interface count, string index, total length, attribute, power in mA
  TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),

  // 1st CDC: Interface number, string index, EP notification address and size, EP data address (out, in) and size.
  TUD_CDC_DESCRIPTOR(ITF_NUM_CDC_0, 4, EPNUM_CDC_0_NOTIF, 8, EPNUM_CDC_0_OUT, EPNUM_CDC_0_IN, 64),

  // 2nd CDC: Interface number, string index, EP notification address and size, EP data address (out, in) and size.
  TUD_CDC_DESCRIPTOR(ITF_NUM_CDC_1, 4, EPNUM_CDC_1_NOTIF, 8, EPNUM_CDC_1_OUT, EPNUM_CDC_1_IN, 64),

  // Interface number, string index, EP Out & EP In address, EP size
  TUD_AUDIO_HEADSET_STEREO_DESCRIPTOR(2, EPNUM_AUDIO_OUT, EPNUM_AUDIO_IN),
};

主机dmesg输出 #

[65995.165040] usb 1-3: new full-speed USB device number 48 using xhci_hcd
[65995.538127] usb 1-3: New USB device found, idVendor=cafe, idProduct=4012, bcdDevice= 1.00
[65995.538132] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[65995.538135] usb 1-3: Product: TinyUSB Device
[65995.538137] usb 1-3: Manufacturer: TinyUSB
[65995.538139] usb 1-3: SerialNumber: 123456
[65995.556877] cdc_acm 1-3:1.0: ttyACM0: USB ACM device
[65995.562864] cdc_acm 1-3:1.2: ttyACM1: USB ACM device
[65995.631858] xhci_hcd 0000:01:00.0: Trying to add endpoint 0x81 without dropping it.
[65995.631862] usb 1-3: Not enough bandwidth for altsetting 1
[65995.646855] xhci_hcd 0000:01:00.0: Trying to add endpoint 0x81 without dropping it.
[65995.646860] usb 1-3: Not enough bandwidth for altsetting 2
[65995.775643] xhci_hcd 0000:01:00.0: Trying to add endpoint 0x81 without dropping it.
[65995.775650] usb 1-3: Not enough bandwidth for altsetting 1
[65995.775653] usb 1-3: 6:1: usb_set_interface failed (-22)
[65995.775765] xhci_hcd 0000:01:00.0: Trying to add endpoint 0x81 without dropping it.
[65995.775769] usb 1-3: Not enough bandwidth for altsetting 1
[65995.775771] usb 1-3: 6:1: usb_set_interface failed (-22)
[65995.775883] xhci_hcd 0000:01:00.0: Trying to add endpoint 0x81 without dropping it.

完整代码已上传至对应的GitHub分支，恳请帮忙排查问题，感谢支持！

内容的提问来源于stack exchange，提问作者Angel