> Not sure I follow what you are saying "by pin" but I think it is because > they use a development system that abstracts some details. I know that I > almost never use the low level registers to configure pins. One reason is > to keep my code portable if I move to a different ARM chip.
Problem is in hardware. The selection mechanism is like this. For each pin GPIO or a peripheral is selected. If for same peripheral input more than one pin is configured there is a collision. If selection mechanism is on peripheral input this will never happen. Method I prefer for pin initialization is to put in one place for all pins. By using this method it is simple to check against schematic. Since there is no pin initialization in software using peripheral there is no need to change then using other pin configuration. To select which peripheral software should a central macro is useful since resource allocation is put in a central place. Software libraries and examples usually provided by manufacturers today is usually a litte bit of a maze to follow compared to the software I usually write. My software is simpler and would probably not work well in a dynamic environment but environment is usually static defined by hardware in the form of a circuit board so this is the first choice then possible. To assign function calls statically in interrupt handler might be a little bit less portable but following execution path is very simple. A portable method to statically assign function calls at compile time would be really good. To clarify: static assignement is done by adding a function call in interrupt handler while dynamic method use a function pointer initialized at startup or changed at any time. Nicklas Karlsson ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
