I have USB-UART module on chip CP2102, connected to host PC and Rx-Tx pins connected to Jetson NX UART pins
I can send data from the host PC (I see it in minicom on the jetson), but nothing received from the jetson on the host.
I connect my oscilloscope to Tx pin on Jetson and see that Low level signal is not fully low:
I checked about three CP2102 - the same
When I short Tx-Rx on NX, its works perfectly
I bought another USB-UART (on PL2303 chip), it works fine
Has anyone seen something like this? Does CP2102 not compatible with Jetson NX?
I have one idea, but I’m not sure about this.
I think that inside NX there is a pulldown resistor that has a value close to the value of the pullup resistor in CP2102. When NX trying to set Low level, these resistors become voltage divider, and we see half the voltage (~1.6V) on the oscilloscope.
(All values in the picture are for example only and are random)