Flashforge creator 3 pro - Nation N32G455 motion controller

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Serial communication between main cpu and motion controller

To monitor communication from the motion controller (Nation N32G455) and the main cpu (Allwinner V3s) , connect a serial cable at J25 as follows:

PCB Marking	FTDI TTL232R-3V3
GND	Black
RX	Orange (TX)
TX	Yellow (RX)

Then connect using a serial cable (8N1, 115200). For example:

minicom -D /dev/ttyUSB0 -b 115200

Upon booting, the following can be seen:

T0:21/0 T1:21/0 B:22/0 C:0/0 
ok 38
ok 38
ok 38
ok 38
ok 
ok Door:T 
ok VC1.2.5 20220516
ok 
ok 38
ok 
ok 38
ok 38
ok 38
ok 38
ok MoveMode: READY
T0:21/0 T1:21/0 B:22/0 C:0/0 
T0:21/0 T1:21/0 B:22/0 C:0/0 
T0:21/0 T1:21/0 B:22/0 C:0/0 
...

It does not show what is sent from the main cpu to the controller.

A better way would be to intercept the serial communication directly from within the cpu. For this we could use socat:

socat  /dev/ttyS0,raw,echo=0  \
  SYSTEM:'tee in.txt | socat - "PTY,link=/tmp/ttyV0,raw,echo=0,waitslave" | tee out.txt'