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/* overo_gpioin
pd external to take input from gumstix overo gpio
Copyright (C) 2012 Tim Redfern
tim@eclectronics.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1
of the License, or (at your option) any later version.
allows use of GPIO pins 146 and 147 on overo expansion header for input
creation parameter 1 - 2 - (gpio 146 / 147)
WARNING use at your own risk!
*/
#include "m_pd.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define min(X,Y) ((X) < (Y) ? (X) : (Y))
#define max(X,Y) ((X) > (Y) ? (X) : (Y))
t_class *overo_gpioin_class;
typedef struct overo_gpioin
{
t_object x_obj;
int gpioNum;
char inputfile[32];
char buffer[2];
FILE *fs;
int set; //0 or 1
} t_overo_gpioin;
void overo_gpioin_bang(t_overo_gpioin *x)
{
//fseek( x->fs, 0, SEEK_SET );
//if ((
x->fs = fopen( x->inputfile, "r" );
//) < 0 )
//{
// error( "Unable to open inputfile" );
// exit( 1 );
//}
int t=fread( x->buffer, sizeof(char), 1, x->fs );
int current=(x->buffer[0]=='1');
if (current!=x->set) {
t_float f=current;
outlet_float(x->x_obj.ob_outlet, f);
x->set=current;
}
fclose(x->fs);
}
void overo_gpioin_free(t_overo_gpioin *x)
{
//
}
void *overo_gpioin_new(t_floatarg f)
{
t_overo_gpioin *x = (t_overo_gpioin *)pd_new(overo_gpioin_class);
outlet_new(&x->x_obj, &s_float);
int nums[]={146,147};
x->gpioNum=nums[min(1,max(0,((int) f)-1))]; //maps switch number to GPIO number
post("overo_gpoin: using GPIO(%d): switch %d\n",x->gpioNum,min(2,max(1,(int) f)));
sprintf(x->inputfile,"/sys/class/gpio/gpio%d/value",x->gpioNum);
//post("inputfile: %s\n",x->inputfile);
char gpionum[4];
sprintf(gpionum,"%d",x->gpioNum);
//if ((
x->fs = fopen( "/sys/class/gpio/export", "w" );
//) < 0 )
//{
// error( "Unable to open exportfile" );
// exit( 1 );
//}
int t=fwrite( gpionum, sizeof(char), 3, x->fs );
fclose(x->fs);
//if ((
x->fs = fopen( x->inputfile, "r" );
//) < 0 )
//{
// error( "Unable to open inputfile" );
// exit( 1 );
//}
t=fread( x->buffer, sizeof(char), 1, x->fs );
x->set=(x->buffer[0]=='1');
fclose(x->fs);
return (void *)x;
}
void overo_gpioin_setup(void)
{
overo_gpioin_class = class_new(gensym("overo_gpioin"), (t_newmethod)overo_gpioin_new, (t_method)overo_gpioin_free, sizeof(t_overo_gpioin), 0, A_DEFFLOAT, 0);
class_addbang(overo_gpioin_class,overo_gpioin_bang);
}
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