Issue: When plugging the RAK7205 in to a computer via a USB cable to change settings, the device does not connect properly
Setup: RAK7205, standard USB cable that has been proven to work with a RA7200
Server: TTN v3
Details:
When plugging the device in to my linux laptop, I get the following in the dmesg logs:
[ 177.845978] usb 1-1: new full-speed USB device number 9 using xhci_hcd
[ 177.969329] usb 1-1: device descriptor read/64, error 17
[ 178.199340] usb 1-1: device descriptor read/64, error 17
[ 178.429308] usb 1-1: new full-speed USB device number 10 using xhci_hcd
[ 178.552655] usb 1-1: device descriptor read/64, error 17
[ 178.782659] usb 1-1: device descriptor read/64, error 17
[ 178.889372] usb usb1-port1: attempt power cycle
[ 179.532640] usb 1-1: new full-speed USB device number 11 using xhci_hcd
[ 179.550080] usb 1-1: device descriptor read/8, error -61
[ 179.673375] usb 1-1: device descriptor read/8, error -61
[ 179.902640] usb 1-1: new full-speed USB device number 12 using xhci_hcd
[ 179.920066] usb 1-1: device descriptor read/8, error -61
[ 180.043402] usb 1-1: device descriptor read/8, error -61
[ 180.149376] usb usb1-port1: unable to enumerate USB device
Error 61 means that no data was sent:
errno 61
ENODATA 61 No data available
Is there any way to reset this unit and get it working again?
Is the board working before? What is the voltage of the battery? If the battery is connected can you measure the supply voltages? If the battery is connected and you connect it to USB, is there light on the LED? Do you see any unusual things on the board physically like burnt marks, etc?
Yup, I’ve tried it with Linux and Windows on two different laptops.
The primary laptop dual-boots Linux and Windows and I can connect to my RAK7200 GPS Tracker without any issues at all using the same cable under both OS’s, the 7205 returns an error in all cases.
I am a bit out of ideas now. Since you tested it already in both OS. Assuming the drivers are ok of course. Are you sure the drivers are still intact? Unlikely reason though.
At this point, it is important that we know the voltage levels on the supply lines of the USB-UART converter chip as well as the RAK811 inside. If there’s a good supply, then highly likely that is the USB-UART chip that is faulty or dead for some reason.
In case, the USB-UART is the culprit, you can still use the device by either replacing it or bypassing the UART lines of RAK811.
Three years later and I’ve finally had a chance to come back to this!
The voltage across the battery is 4.17v. This is after charging via the USB port until the red charging light goes out.
When I connect the battery, LED2 (blue) flashes briefly and then goes out
Testing the voltage generated by the solar panel reveals an acceptable level of 2.5v under LED indoor lighting - I am not currently able to test outdoors
~My next plan was to test the serial voltage and the output for each of the 5v and 3.3v pins on the GPIO header, however it is unclear from the diagram which of the other pins on that header are GND, and what I need to do to ensure the serial port on the header is setup correctly.~
EDIT: I found the pin-out further down the page, connecting my multimeter to 3.3v and GND shows that I am getting 3.29v on that pin, so that’s good. I couldn’t work out how to measure the serial port though?
The issue is likely on the USB-Serial converter since it is failing to enumerate.
What you can do is probably use an external USB-Serial converter and connect to the device via the header pins. This means you have to change the jumper of J25 (RX jumped to RX1).
