
我有一個 USB CDC-ACM 設備,模擬 USB 串行通訊。 CDC 通訊和資料介面分別顯示在 2-1:1.0(通訊)和 2-1:1.1(資料)介面描述符上,且驅動cdc_acm
程式正在正確載入。
/dev/ttyACMX
我的問題是驅動程式僅分配通訊接口cdc_acm
,但資料接口被忽略。它似乎會阻止設備正常工作(使用 ccTalk 協議的 GBA ST2 帳單驗證器)。使用驅動程式在 Windows 8+ 上運作良好usbser.sys
。
使用cdc_acm
驅動程序,dmesg 和 lsusb 輸出為:
$ dmesg
[ 3484.982436] usb 2-1: new full-speed USB device number 4 using ohci-pci
[ 3485.251788] usb 2-1: New USB device found, idVendor=16f9, idProduct=0003
[ 3485.251792] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3485.251794] usb 2-1: Product: GBA ST2
[ 3485.251795] usb 2-1: Manufacturer: Astrosystems
[ 3485.251796] usb 2-1: SerialNumber: 06010010001
[ 3485.260103] cdc_acm 2-1:1.0: ttyACM0: USB ACM device
$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
|__ Port 1: Dev 4, If 0, Class=Communications, Driver=cdc_acm, 12M
|__ Port 1: Dev 4, If 1, Class=CDC Data, Driver=cdc_acm, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/12p, 480M
表明:
- 2-1:1.0 分配給
/dev/ttyACM0
- 2-1:1.1 被忽略
透過使用usbserial
驅動程式將資料介面分配給/dev/ttyUSBX
端口,我發現以下操作有時作品:
- 插入設備並讓它使用
cdc_acm
驅動程式。這會導致設備退出睡眠模式(設備 LED 變為綠色) - 切換到
usbserial
使用 的驅動程序modprobe -r cdc_acm && modprobe usbserial vendor=0x16f9 product=0x0003
,導致 Comm 介面被忽略,而 Data 介面被分配給 USB 連接埠 - 如果裝置返回睡眠模式,則需要重新插入並從步驟 1 重新初始化
使用usbserial
驅動程式時:
- 2-1:1.0 被忽略
- 2-1:1.1 分配給
/dev/ttyUSBX
相關 dmesg 和 lsusb:
$ dmesg
[ 3688.481125] usbserial_generic 2-1:1.0: Generic device with no bulk out, not allowed.
[ 3688.481153] usbserial_generic: probe of 2-1:1.0 failed with error -5
[ 3688.481157] usbserial_generic 2-1:1.1: The "generic" usb-serial driver is only for testing and one-off prototypes.
[ 3688.481158] usbserial_generic 2-1:1.1: Tell [email protected] to add your device to a proper driver.
[ 3688.481160] usbserial_generic 2-1:1.1: generic converter detected
[ 3688.481219] usb 2-1: generic converter now attached to ttyUSB0
$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-pci/12p, 12M
|__ Port 1: Dev 4, If 0, Class=Communications, Driver=, 12M
|__ Port 1: Dev 4, If 1, Class=CDC Data, Driver=usbserial_generic, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/12p, 480M
我的猜測是,設備使用 CDC 通訊介面來執行某種初始化,然後在使用時使用 CDC 資料介面。
如何將兩個介面連接到 USB 和/或 ACM 連接埠?我是否應該實現自己的驅動程式(或擴展 cdc_acm 驅動程式)以將每個描述符明確附加到 USB 或 ACM 連接埠?
以下是範例lsusb
-v 輸出,顯示 2-1:1.0 上的通訊介面和 2-1:1.1 上的資料介面:
Bus 002 Device 003: ID 16f9:0003
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x16f9
idProduct 0x0003
bcdDevice 14.06
iManufacturer 1 Astrosystems
iProduct 2 GBA ST2
iSerial 3 06010010001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 62
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 4 GBA USB Serial Port
CDC Header:
bcdCDC 1.20
CDC ACM:
bmCapabilities 0x02
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 50
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 4 GBA USB Serial Port
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0001
Self Powered