Received an under-dash M2 last week ago or so. My first goal is to just sniff/verify traffic on a CAN project that’s on my desk – currently, it’s 3 nodes, 2 on arduino with CAN shields and one with 32M1 hosted on stk600 dev card. Communication/behavior of these nodes seems correct according to Serial messages, but I’d like to use M2 and SaavyCAN to see more, especially as project gets more complicated.
I followed instructions here (https://docs.macchina.cc/projects/use-m2-with-savvycan) to set M2 up for Win10 Saavy. So, after flashing M2Ret, i hooked up to my car and got reasonable CAN traffic. Good.
However, the instant I hook the M2 into my desktop CAN project, all traffic halts. Looking at the Atmega32M1 registers, it looks like there is a Form Error (FERR). I’ve hooked up the M2 referring to the pinout:
M2 pin 16 gets a solid 12vdc,
6 and 14 <–> CAN hi and low respectively
4 and 5 --> ground
All other pins are open.
Usb cable to M2 can be connected or not, no difference.
As soon as I unplug the M2, traffic goes back to normal with no Errors. It will run without errors indefinitely.
I’m I doing anything obviously noobish.