我正在使用运行 Debian 的 BeagleBone 板。
当我插入 USB 蜂窝调制解调器时，会在文件夹中创建以下文件/dev：ttyACM0、ttyACM1、ttyACM2、ttyACM3、ttyModem0、ttyModem1和ttyModem2。ttyModem3
我找不到足够的信息。它如何以及为什么创建所有这些文件？
这些文件是特定于调制解调器的，还是属于内核一部分的通用文件？
当我插入设备时 dmesg 输出：
new high-speed USB device number 4 using musb-hdrc
[ 663.611026] usb 1-1.1: New USB device found, idVendor=1e2d,
idProduct=005b
[ 663.611046] usb 1-1.1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 663.611053] usb 1-1.1: Product: ELSx
[ 663.611059] usb 1-1.1: Manufacturer: Cinterion Wireless Modules
[ 663.651549] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device
[ 663.659983] cdc_acm 1-1.1:1.2: ttyACM1: USB ACM device
[ 663.668360] cdc_acm 1-1.1:1.4: ttyACM2: USB ACM device
[ 663.679311] cdc_acm 1-1.1:1.6: ttyACM3: USB ACM device
[ 663.689635] cdc_acm 1-1.1:1.8: ttyACM4: USB ACM device
[ 663.708738] cdc_ether 1-1.1:1.10 usb0: register 'cdc_ether' at usb-musb-
hdrc.1-1.1, CDC Ethernet Device, fa:96:11:12:13:14
[ 663.718331] cdc_ether 1-1.1:1.10 usb0: kevent 12 may have been dropped
[ 663.734877] cdc_ether 1-1.1:1.12 usb1: register 'cdc_ether' at usb-musb-
hdrc.1-1.1, CDC Ethernet Device, fa:96:11:12:13:16
[ 663.838982] 8021q: 802.1Q VLAN Support v1.8
[ 663.863935] cdc_ether 1-1.1:1.10 usb0: kevent 12 may have been dropped
[ 663.870702] cdc_ether 1-1.1:1.10 usb0: kevent 12 may have been dropped
[ 663.914471] IPv6: ADDRCONF(NETDEV_UP): usb0: link is not ready
答案1
/dev/ttyACMX是子类型“抽象控制模型”(ACM)的USB通信设备(CDC)。
据我所知，每个都是相应 GSM 调制解调器ttyACMX的别名。ttyModemX