[Flashforth-devel] 70 MIPS on a dspic33ep512mc806?

[Bob E. <bob...@ti...>]

I'm a Flashforth fan - brilliant tool!

I'm attempting to run Flashforth on a dspic33ep512mc806 as part of this 
DSP radio project http://www.cumbriadesigns.co.uk/DSP.htm. Flashforth 
runs fine on the stock settings from the distribution - Fcy reports 
39.613MIPS. I've been attempting to modify the code to take it up to the 
full 70MIPS. It seems arithmetic on constants in the code objects to 
that - greater than 16 bit values result. I expect I'm not far away from 
getting it going, but I'm currently getting the 'Flashforth' title on 
cold start at 9600 baud, but gibberish if I type anything.

The board has a 20MHz crystal, so the PLL needs to be used to boost to 
Fosc=140MHz. That results in 70MIPS cpu operation.

I'm using a Pickit3 for development.

Anyone been more successful with this or have any debug suggestions to 
get to the problem? I'm new to this.

Regards, Bob