Re: [Amforth-devel] My issue with 2variable in int_isr

[Matthias T. <mt...@we...>]

Hi Pito,

it took quite a while, sorry for that

> However with 2variable "seconds" definition:
> 
> decimal
> 2variable ticker
> 2variable seconds
> 262144. 2constant clkpi    ( clk per interrupt = 256*prescaler )
> 1. ticker 2!
> 0. seconds 2!
> \ overflow2 interupt service routine
> \ ! not optimised yet
> : tick_isr
> ticker 2@ clkpi d- ticker 2!
> ticker 2@ clkpi d< if  f_cpu ticker 2@ d+ ticker 2!
> 1. seconds 2@ d+ seconds 2!
> then ;
> 
> it crashes in such a way I have to reflash rom to get access to system.
> What is the trick here?

well, a small bug leads to the error: amforth does not compile double
cell numbers into the colon words, only single cell constants. I have no
fix yet (still working on it). A workaround is a definition like

: double1 1. ;

and use of the double1 instead of 1. 

...

double1 seconds 2@ d+ seconds 2!

...

that works for me with your code (without crash and increasing
seconds after many tick_isr calls).

Matthias