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Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Bjorn, Is vectorizer open source? It looks interesting... I had built something similar, but switched to a digital PWM system instead for its stability (used as an emf renderer).
The USB based boot loader PICs are nice for most things (~24KB @ 48MHz + USB + serial com module.) C compilers are only good if you plan to write an interrupt based scheduler to guarantee timing for some things. (most C compilers for PIC are overpriced garbage, except the DSPIC series that use a gcc.)
ARM is nice too (note the good chips seem to be SOIC only), but the ARM gcc tool chain is good.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Vectorizer is not open source, but I am usually very helpful.
C compilers for very simple projects can be more trouble than they are worth. A competent programmer should be able to learn the PIC instruction set and make small useful programs with perfect timing in an afternoon.
One of the problems with gcc for ARM is that if you use some functions like printf it will include about 30kB of code that will never be executed and it will quickly sink your project unless you know how to hack away at the libraries.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Have you tried gcc -O2 to run the optimizer ;-]
Also note the gcc is bad at byte alignment and padding for struct's. This is what causes constants in rom space to mysteriously lose space. Sometimes, what is normally bad code (or a trivial performance loss) on a PC will actually work better on a uC.
As for libs, most people have to write their own print() function to drive whatever display they plan to use.
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