I am almost setup for the first test of firmware upload.

I will try first usb serial connection and than will hook up the bluetooth more testing. A quick question is about rx and tx between board and serial cable. Should they be straight or crossed. tx=>tx rx=>rx or tx=>rx and rx=>tx.

The bluetooth module have some state pin[PIO9] that can be repurposed as dtr. STock is set to pull pin high on connection. I change it to pull it low on connection.
The module is HC05, cheap china crap for around $3. Will see it how it goes later.

I am having postman coming tomorrow so it is getting exciting.

Some voltage protection circuits will be nice addition for the later revisions if there are any. The pcm have all kind of them and Tom H can give some ideas how it is wired.