[Flashforth-devel] FF 3.8 onto newer PIC18FxxK22 chips

[craig b. <dab...@ya...>]

Hi. I'm new at this email/online support thing, but played with Forth in the later 80-s and have been programming assembler into PIC16 chips for a couple of decades.  PIC18-s, only occasionally (the PIC17 was brand new back then) but appreciate the architecture.

I've gotten FF up and running nicely on 18F4550-s and an 18F4458 recently, but would like to use it in an 18F26K22 with the double UART.  I've built a p18f26k22.cfg file with the config-bit settings and flash-write parms, extended the p18fxxxx.cfg file to cover the chip, tweaked the p18f-main.cfg and added a few small mods to the  OSCCON and baudrate code in the ff_usb.asm to try and use the on-board intosc-pll combo to goose it up to 64Mhz operation.

So far, I haven't gotten anything coherent out of the primary uart at any baudrate.  My BitScope in logic mode shows me a quick series of blips (several per ms) for a few ms, a ms-long active bump, and then idle except for  a blip each time the watchdog overflows.  I didn't touch the watchdogging...  Every change I've made to the config-bits or adding debug routines to the startup sequence has made it worse if not hung it completely.

Has anyone else tried this stunt and/or have any suggestions about what I'm missing (besides "Don't fix a working program") ?

Thanks and I hope this isn't a major intrusion.

 craig bair, binary behaviorist

...not a speck of serial...