SerialUSB CDC test

If anyone has a CDC USB serial device would they like to try out SerialUSB_CDC_10a.

I’ve added support for CDC devices and would like to know if you can send and receive.

I’ve tested it out on a Arduino uno R3 clone – but would still like to know if your version works – or not.

If you have an arduino with a cdc usb interface I used the following Arduino IDE sketch to test.

void setup()
{
  Serial.begin(115200);
  while (!Serial) {}
  Serial.write("\r\nSerialTest: Type something and it should echo\r\n>");
}

void loop() 
{
  if (Serial.available()) Serial.write(Serial.read());
}

I then ran the !SerialTerminal program in the zip file. If you type into the window that opens and you see the characters you type that means you are sending and receiving – only received characters are displayed.

If you need a different baud rate open a serialterminal window at the command line with

*serialterminal baud=9600

If you have a CDC USB serial adapter you can just connect the rx and tx pins and use !SerialTerminal.

I’d also like to know the ProductId mentioned in *usbdevices

Could you please explain what the device is a little more? Even searching on the Web left me less than informed.

CDC USB serial device

I’ve tried an old alcatel phone I know has cdc, and a newer samsung tab A which going by googling should be cdc. In tethering mode I can see the 2 way pipe symbol in usbinfo, but not a peep out of your terminal window. Have hung the Iyonix a few times trying.
Maybe a tethered connection is waiting for something specific?
Pretty sure I seen mention of the alcatel being 9600 baud once, but tried a few speeds on both.
Edit: an older Nexus 10 tablet (no sim) only has MTM/PTP,its currently showing camera icon for the PTP interface in usbinfo.
I have some usb mobile modems, but they have to be set up so they change mode from the initial (CD instal) storage mode. I would have to fish out some BASIC that I used.

Could you please explain what the device is a little more? Even searching on the Web left me less than informed.

I’ll try. SerialUSB allows the use of serial to usb adapters like this Most usb to serial adaptors use proprietary usb interfaces but USB standards have a generic interface for serial communications over usb – CDC. I just read enough to get serial port <→ usb working – cdc covers more than that.

I’ve had difficulty finding a CDC serial adapter to test but when I was asked to do a CDC backend for SerialUSB I was informed that the Arduino Uno uses CDC serial interface – a lot of the clones use other serial usb interfaces which already work. Unfortunately after getting one, my device is now working but his only sends and I was wondering if the problem was specific to his device – hence this post.

I’ve tried an old alcatel phone I know has cdc

I’m afraid I don’t know how phones work or how you would test if a connection was working with it. For it to connect with SerialUSB *show should show something like

USB$Device_02_02_01_2341_0043_01_00_0001_USB9 : 9 0 0

and

USB$Device_0A_00_00_2341_0043_01_01_0001_USB9 : 9 1 0

The 02_02_01 and 0A_00_00 is the significant bit

The device should show up in *serialusbdevices

Just tried on my son’s Arduino Uno and it’s not working.
*USBDevices shows:
14 2 5 2/ 0 Arduino (www.arduino.cc) Product ID 0043
and for USB14 I have:
USB$Device_02_00_00_2341_0043_-1_-1_001_USB14 : 14
USB$Device_02_02_01_2341_0043_01_00_001_USB14 : 14 0 0
USB$Device_0A_00_00_2341_0043_01_01_001_USB14 : 14 1 0

But *SerialUSBDevices doesn’t show anything and I get no response from the SerialTerminal at either 9600 or 115200

Thanks for trying. That ‘should’ work – at least it should be listed in *serialusbdevices. Did you doubleclick on the SerialUSB module in the zip file linked in the first post?

It may not do anything in !serialterminal – other than show the device name if the uno is not programmed to output serial info like the example sketch I posted.

I’d programmed the example sketch onto the Arduino and it was working on my laptop and so I knew the Arduino was okay.
I hadn’t realised but my ARMX6 already had version 0.08 of the SerialUSB module.
Having loaded version 0.10 it’s now working – it appears in *SerialUSBDevices and !SerialTerminal works.
Might be worth amending the !Boot file so it forces version 0.10 rather than 0.08 as it does at the moment.

Ahhh. I just did a little digging. The legitimate Arduino Uno uses an ATmega8U2 for serial. I’m with you now. I think the Arduino Leonardo may be in the same family with the ATmega32u4 uC which also handles USB. I’ve got a few ATmega32u4 based devices. Useful things. I used one with a touchpad I ripped out of a broken notebook as a USB mouse.