I've built a custom PCB based on the Teensy 3.1 schematic from PJRC and I am using a Mini54 purchased from PJRC. On power up, it doesn't appear the Mini54 is properly communicating with the Mk20. I've read through the links on the PJRC Mini54 page and I don't appear to have any of the issues that came up there. I'm still not having any success.
Here is the schematic:
Here is what the Reset (P3.2), in yellow, and Prog (P5.2), in blue, pins look like on the scope:
Here is what happens when I ground the Prog line:
Power is clean and solid.
I'm getting no USB communications. Ideas?
Here is the schematic:
Here is what the Reset (P3.2), in yellow, and Prog (P5.2), in blue, pins look like on the scope:
Here is what happens when I ground the Prog line:
Power is clean and solid.
I'm getting no USB communications. Ideas?