Re: [avr-gcc-list] Tables

[Oleksandr Redchuk]

2009/3/4 David VanHorn <address@hidden>:

> so manually creating the table with a spreadsheet would be one way, though
> icky.
> I'm hoping there's a way to have the compiler generate it for me?

Use COG http://nedbatchelder.com/code/cog/ for generating tables in your source

There is example - cog generate table for ADC values for 5 jumpers
with weighted resistors and one resistor to ground.

// table.cog
//   C source with cog scripts
//   this file must be edited in project
#include <avr/io.h>
#include <avr/pgmspace.h>

uint8_t get_options()
{
    const uint16_t level_table[] PROGMEM = {
// COG will generate table content here
/*[[[cog
rground = 6.8
resistors = [160.0, 82.0, 39.0, 20.0, 10.0]
nres = len(resistors)
code = 0
for i in range(1,2**nres) :
        rpar = 0
        for k in range(nres) :
                if i & (1<<k) :
                        rpar += 1 / resistors[k]
        prevcode, code = code, 1024.0 * rground / (1.0/rpar + rground)
        cog.outl('    %d,' % round( (prevcode+code)/2 ) )
]]]*/
//[[[end]]]
    };
    uint16_t value = get_adc_average(ADC_OPTIONS,2);
    return search_level( value, jumper_levels,
sizeof(jumper_levels)/sizeof(jumper_levels[0]));
}


# makefile rule for generating intermediate C-files from cog-files
COG = python c:/bin/cog/scripts/cog.py

%.c : %.cog
        echo ====        make $@ from $< ; $(COG) $< >$@


table.o must be included in obj-file list of project OR table.c must
be included in CSRC list
for automatic (re)generation table.c from table.cog

-- 
wbr,
ReAl