Re: [Flashforth-devel] 70 MIPS on a dspic33ep512mc806?

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

Thanks for the hints chaps, I got the 70MIPS version going pretty well. 
It's been soaking a multitask based 'LED flash' test for a couple of days.

I think I'd got the HSPLL oscillator and baud rate settings right. What 
did need changing was the 'MS' delay word. My solution was to set timer1 
to have a prescaler of 8:1 and load the timer with MS_PR_VAL = 
((FCY/1000)/8-1) instead of ((FCY/1000)-1) to keep within 16 bits.

Mikael, will I have to fix the cpu 'LOAD' word as well which uses 
timer3?  I notice 'mov     #FCY/3126, W2' in the definition - how is the 
magic number 3126 derived, please?

The serial interface is set at 9600 baud for now. I get the expected 
errors on uploading files from my Windows PC until I slow Teraterm down 
with inter-line and char delays. Then the upload is fault free. I use an 
HC-05 bluetooth module for the serial link - it's fun to see how far 
around the house and garden I can communicate with the dspic.

regards, Bob