Problem: Cannot read USB Serial from Teensy 3.1 on Debian machine

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local_dani_21

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Hi

I have successfully installed teensy_loader_cli on a debian jessie machine to upload .hex-files to a USB-connected teensy 3.1. I would like to be able to «listen» on that USB serial port similar to the «Monitor» in the Arduino IDE.

According to http://playground.arduino.cc/Interfacing/LinuxTTY I try to connect looking in /var/log/messages for the right device:

Code: 
Jun  3 14:21:52 pi2 kernel: [  663.307763] usb 1-1.2: new full-speed USB device number 14 using dwc_otg
Jun  3 14:21:52 pi2 kernel: [  663.429559] usb 1-1.2: New USB device found, idVendor=16c0, idProduct=0478
Jun  3 14:21:52 pi2 kernel: [  663.448143] usb 1-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=1
Jun  3 14:21:52 pi2 kernel: [  663.466803] usb 1-1.2: SerialNumber: 000163A9
Jun  3 14:21:52 pi2 kernel: [  663.486669] hid-generic 0003:16C0:0478.0008: hidraw0: USB HID v1.11 Device [HID 16c0:0478] on usb-bcm2708_usb-1.2/input0
Jun  3 14:21:53 pi2 kernel: [  664.629482] usb 1-1.2: USB disconnect, device number 14
Jun  3 14:21:53 pi2 kernel: [  664.843781] usb 1-1.2: new full-speed USB device number 15 using dwc_otg
Jun  3 14:21:53 pi2 kernel: [  664.967133] usb 1-1.2: New USB device found, idVendor=16c0, idProduct=0483
Jun  3 14:21:53 pi2 kernel: [  664.985563] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun  3 14:21:53 pi2 kernel: [  665.004486] usb 1-1.2: Product: USB Serial
Jun  3 14:21:53 pi2 kernel: [  665.020446] usb 1-1.2: Manufacturer: Teensyduino
Jun  3 14:21:53 pi2 kernel: [  665.036615] usb 1-1.2: SerialNumber: 910490
Jun  3 14:21:53 pi2 kernel: [  665.084384] cdc_acm 1-1.2:1.0: ttyACM0: USB ACM device

So then I try to configure the device using
Code: 
stty -F /dev/ttyACM0 cs8 57600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts


And then try to connect using
Code: 
tail -f /dev/ttyACM0

But I read nothing. Do you have any advice? Thank you!

Dani

PS: Sometimes, after resetting the teensy with the pushbutton (and being fast changing the device name), I read a few lines, but the transcript stops after one or two seconds. The baud rate is the same on both sides.
 
Last edited:
Yup, you need to use a program like screen or minicom or seyon.

Normal unix utilities like tail and cat will believe they've reached the end of a file when Teensy stops sending data, even briefly, and quit.
 
Great, thank you very much. To conclude:

Code: 
stty -F /dev/ttyACM0 cs8 57600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts &
followed by
Code: 
screen /dev/ttyACM0

gives me a great monitor to look at USB-Serial of the teensy.

Works like a charm.
Best regards,
Dani

PS: Is there a way to quit screen? Ctrl-C/D etc don't work.
 
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