{"id":1519,"date":"2016-05-03T22:31:08","date_gmt":"2016-05-03T14:31:08","guid":{"rendered":"http:\/\/kaoru.tech\/?p=1519"},"modified":"2016-05-03T23:30:18","modified_gmt":"2016-05-03T15:30:18","slug":"how-to-use-usb-cdc-acm","status":"publish","type":"post","link":"http:\/\/kaoru.tech:7000\/wordpress\/?p=1519","title":{"rendered":"How to use USB CDC ACM"},"content":{"rendered":"

Kernel Configuration<\/h1>\n

\"Gadget<\/a><\/p>\n

On Embedded\u00a0Platform<\/h1>\n

Insmod Drivers<\/h2>\n

After that, a new UART device node will be found in \/dev\/<\/p>\n

# create mod.sh file and input followed command\r\n \r\n#\/bin\/sh\r\n\r\ninsmod configfs.ko\r\ninsmod libcomposite.ko\r\ninsmod u_serial.ko\r\ninsmod usb_f_acm.ko\r\ninsmod g_serial.ko\r\n\r\n# chmod +x mod.sh\r\n# .\/mod.sh \r\ng_serial gadget: Gadget Serial v2.4\r\ng_serial gadget: g_serial ready\r\n# ls \/dev\/ttyGS0 -l\r\ncrw-rw----    1 root     root      249,   0 Jan  1 02:40 \/dev\/ttyGS0<\/pre>\n
Connect Target to Host with a USB cable<\/h2>\n
You will see Windows notice found a new hardware and try to search and install driver.<\/p>\n
\"Gadget<\/a><\/p>\n
On Host\u00a0Platform<\/h1>\n
After\u00a0installation complete, you will see a new serial on Windows<\/p>\n
\"Gadget<\/a><\/p>\n
And, you will see followed print on target console<\/p>\n
# g_serial gadget: high-speed config #2: CDC ACM config<\/pre>\n
Then you can test it use ‘putty’ or ‘Secure CRT’ and so on.<\/p>\n
Also, you can connect and test it on virtual PC.<\/p>\n
\"Netchip<\/a><\/p>\n
with followed kernel message print<\/p>\n
[ 7676.420719] usb 1-2: new high-speed USB device number 7 using xhci_hcd\r\n[ 7676.767377] usb 1-2: New USB device found, idVendor=0525, idProduct=a4a7\r\n[ 7676.767381] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0\r\n[ 7676.767382] usb 1-2: Product: Gadget Serial v2.4\r\n[ 7676.767384] usb 1-2: Manufacturer: Linux 3.14.38+ with 2184000.usb\r\n[ 7676.801767] cdc_acm 1-2:2.0: This device cannot do calls on its own. It is not a modem.\r\n[ 7676.801862] cdc_acm 1-2:2.0: ttyACM0: USB ACM device<\/pre>\n
so you can test it by ‘minicom -D\u00a0\/dev\/ttyACM0’.<\/p>\n
Reference<\/h1>\n