how_to_mix_c_and_asm
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how_to_mix_c_and_asm [2006/10/15 09:35] 127.0.0.1 (old revision restored) |
how_to_mix_c_and_asm [2008/09/29 12:27] (current) wackazong |
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| You might have to declare some additional variables, but the concept is quite straightforward. | You might have to declare some additional variables, but the concept is quite straightforward. | ||
| + | Do not forget to include the header file of your processor from the SDCC header files, or variables like PRODL will not be defined: e.g. #include <pic18f4685.h> | ||
| <code c> | <code c> | ||
| - | unsigned char Scale_7bit(unsigned char evnt2, unsigned char min, unsigned char max) | + | unsigned char Scale_7bit(unsigned char evnt2, unsigned char min, unsigned char max) { |
| - | { | + | |
| // scaled value is (<8-bit random> * ) >> 8 | // scaled value is (<8-bit random> * ) >> 8 | ||
| PRODL = evnt2 << 1; // 8bit value | PRODL = evnt2 << 1; // 8bit value | ||
| Line 20: | Line 20: | ||
| </code> | </code> | ||
| + | Also, as well as the above example of 'inline ASM', it is possible to include ASM code in .inc include files, and call that ASM code from within your C application. Please see the forum thread [[http://www.midibox.org/forum/index.php?topic=7698.0|using assembler in C - question about _ in front of macro names]] for more info. | ||
how_to_mix_c_and_asm.1160904901.txt.gz · Last modified: 2007/04/07 02:47 (external edit)
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