skestans wrote: ↑
Feb 15 2020 12:40am
I flashed mine with a CH340 after accidentally frying my CP2102. I left the jumper open so I don’t know if my vcc was 3.3V or 5V on the CH340. BIT it worked without damage.
Your error has to do with windows not able to grab the com port to the serial adapter. I have a 850c with shot serial lines and the error is different in that case: you can grab the com port but it never detects the display turning on for flashing. And if you plug it back into the motor with stock firmware, the watt meter below the speed goes nuts, and the walk assist doesn’t do anything. These are the symptoms for shot serial on the 850c.
In your case it looks like a shitdows issue.
did you use separate power for display or like in wiki.
I think I also shot my 850c serial line. Tried in win7, got same result.
In putty if I try to connect to it like in APT, it connects to it, then when I short press the power button I get "error reading from serial device", windows makes sound like I plugged in/out usb dongle, and putty freezes, with putty "inactive" on the status.
If I turn on 850c there is an error code 30h - which is related to serial connection.
Is there a way to test serial connection on 850c with computer.Don't have bafang motor to test it.
Should the RX led (on ttl dongle) be lit on when in flashing mode, voltage is only 1V (white RX line), on tx line (on ttl dongle) it is 3.3V (green line) and led is not on. There is also difference in resistance btw tx and rx line (15k ohm TX to GND vs 8k ohm on RX).