/usr/share/doc/libcomedi-dev/demo/sender.c is in libcomedi-dev 0.10.2-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /*
* Digital I/O example
* Part of Comedilib
*
* Copyright (c) 1999,2000 David A. Schleef <ds@schleef.org>
*
* This file may be freely modified, distributed, and combined with
* other software, as long as proper attribution is given in the
* source code.
*/
/*
* Requirements: A board with a digital I/O subdevice. Not just
* a 'digital input' or 'digital output' subdevice, but one in
* which the channels can be configured between input and output.
*/
#include <stdio.h>
#include <comedilib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "examples.h"
int chan_dat = 1;
int chan_clk = 0;
int wait1 = usec_to_nsec(0);
int wait2 = usec_to_nsec(0);
comedi_t *device;
void write_bits(int subdevice, int bits);
int main(int argc, char *argv[])
{
int ret;
int stype;
int i;
struct parsed_options options;
init_parsed_options(&options);
options.subdevice = -1;
parse_options(&options, argc, argv);
device = comedi_open(options.filename);
if(!device){
comedi_perror(options.filename);
exit(-1);
}
if(options.subdevice < 0)
{
options.subdevice = comedi_find_subdevice_by_type(device, COMEDI_SUBD_DIO, 0);
if(options.subdevice < 0){
fprintf(stderr,"No dio subdevice found.\n");
exit(-1);
}
}
stype = comedi_get_subdevice_type(device, options.subdevice);
if(stype != COMEDI_SUBD_DIO){
printf("%d is not a digital I/O subdevice\n", options.subdevice);
exit(-1);
}
printf("configuring pin %d for output...\n", chan_dat);
ret = comedi_dio_config(device, options.subdevice, chan_dat, COMEDI_OUTPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(-1);
}
printf("configuring pin %d for output...\n", chan_clk);
ret = comedi_dio_config(device, options.subdevice, chan_clk, COMEDI_OUTPUT);
if(ret < 0){
comedi_perror("comedi_dio_config");
exit(-1);
}
for(i = 0; i < 0x100; i++){
write_bits(options.subdevice, i);
}
//write_bits(0xa5);
return 0;
}
void write_bits(int subdevice, int bits)
{
comedi_insnlist il;
comedi_insn insn[5];
lsampl_t data[10];
int mask = (1<<chan_dat)|(1<<chan_clk);
int i;
int bit;
int ret;
il.n_insns = 5;
il.insns = insn;
memset(insn,0,sizeof(insn));
/* clock low, set data */
insn[0].insn = INSN_BITS;
insn[0].n = 2;
insn[0].data = data + 0;
insn[0].subdev = subdevice;
/* wait 1 */
insn[1].insn = INSN_WAIT;
insn[1].n = 1;
insn[1].data = data + 2;
/* clock high, same data */
insn[2].insn = INSN_BITS;
insn[2].n = 2;
insn[2].data = data + 4;
insn[2].subdev = subdevice;
/* wait 1 */
insn[3].insn = INSN_WAIT;
insn[3].n = 1;
insn[3].data = data + 6;
/* clock low, same data */
insn[4].insn = INSN_BITS;
insn[4].n = 2;
insn[4].data = data + 8;
insn[4].subdev = subdevice;
for(i=0;i<8;i++){
bit=1<<(7-i);
//printf("writing %d\n",bit&bits);
data[0] = mask;
data[1] = (bits&bit)?(1<<chan_dat):0;
data[2] = wait1;
data[3] = 0;
data[4] = mask;
data[5] = ((bits&bit)?(1<<chan_dat):0)|(1<<chan_clk);
data[6] = wait2;
data[7] = 0;
data[8] = mask;
data[9] = (bits&bit)?(1<<chan_dat):0;
ret = comedi_do_insnlist(device,&il);
if(ret < 0)
comedi_perror("comedi_do_insnlist");
}
}
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