USB serial not working

[jonnor]

Under https://github.com/rad1o/f1rmware/blob/master/doc/debugging.md it is mentioned that USB serial should be possible, and that the testapp -> CDC does something with this.

I tried to

• Run udevadm monitor on computer (Linux 4.1) to observe for devices being connected
• Power the rad1o, go into testapp, start CDC. Poke joystick around.

Expected:

• To see a serial device on computer.
• That CDC app writes something helpful to LCD screen

Actual:

• No serial devices is seen on computer.
• Nothing is shown on LCD screen (stays in menu)
• The rad1o freezes, need to reboot to go to another app

Tested both USB ports. Tested on two different devices. Running f1rmware from git. MSC mode works fine.

[jonnor]

Need this for MicroFlo (a dataflow programming env I ported to radio), so I can live program it from host : )

[erikbos]

I have tried to use CDC as well, with both the rad1o library code and NXP's library code for the NXP4330. In both cases I could not get it to work: The VCP device does not appear on my laptop and the code appears to wait forever on a call to vcom_connected().

Also in the testapp's cdc tester does not work at first use, it hangs as well. It does work when starting the testapp, selecting msc, stopping msc, and then starting cdc. So it looks like the msc code initialises something cdc needs as well..

[jonnor]

@erikbos So when you run the msc code first, you see the serial device on laptop?

[erikbos]

Yes, the usb device appears on my Mac. "screen /dev/tty.usbmodem-" connects to it and the cdc option in the demo app echos everything that I type back to me. Characters typed are echoed with bracket as the code is supposed to do, so it is not the local terminal doing the echoing.

[erikbos]

FYI: as work around in my rad1o app code I added:

MSCenable();
MSCdisable();
CDCenable();

to toggle MSC mode on and immediately off, followed by calling CDCenable: that appears to reliable setup the rad1o's for CDC.