[Amforth-devel] '328p + 25LC512

[Karl L. <kar...@se...>]

I now have a two-chip system (ATmega328P + 25LC512 serial EEPROM)  
that lets me save a working amforth image to serial EEPROM and  
selectively restore that system to flash on reset.  This makes a huge  
difference in development, since I was forever lancing the kernel and  
having to drag out the AVR programming dongle.  Now, I just hold down  
the LOAD button on my target, hit reset, and the system is restored  
to the previous save.

The save_system word copies the full image, including the contents of  
EEPROM, to flash.  So I can extend the dictionary as much as I want;  
the restored system works just like it did immediately prior to the  
save.  (Warning: This hasn't been extensively tested, but I'm pretty  
sure it works.  :-) )

I've created a set of .asm files that support this system.  The  
serial EEPROM words are compiled into the kernel at build-time and I  
had to make some changes to the amforth.asm file, so the final image  
needs at least a '328p to hold the larger bootloader code.  Total  
size, including EEPROM data, is slightly over 11 KB.

I can make the .asm files available if anyone is interested...

Karl