I am trying to get to u-boot on an OpenWRT router using TTL/USB converters but I am failing. I tried a CP2102 and a Ch340g (3.3V). I can get no data on the serial consoles with either.
I set up the pins as recommended:
TX on the USB -> RX on the router
RX on the USB -> TX on the router
GND USB -> GND on router
I tried inverting TX/RX also to no avail. I have tested in serial consoles in both windows and linux, but no data is transmitted.
I tried a PL2303HX 5V cable also. This one prints a lot of gibberish on the terminal, but I suspect the voltage isn't adequate.
Anyone got any idea?