/usr/share/doc/libcomedi-dev/demo/ledclock.c is in libcomedi-dev 0.10.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 | /*
* LED Clock demo
* Part of Comedilib
*
* Copyright (c) 2001 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 output subdevice and a subdevice that
* can trigger on an external digital line. A parallel port
* satisfies these requirements.
* - A Fantazein LED Clock modified so that the individual LEDs
* can be controlled directly by the digital I/O lines.
*
* The Fantazein clock has 8 LEDs arranged in a row on a wand that
* sweeps back and forth at about 15 Hz. Unmodified, the firmware
* of the clock lights the LEDs at the appropriate time to print
* words and the time of day. Since the wand moves quickly, it is
* barely visible, so it looks like the image floats in the air.
* Stuart Hughes modified a clock so that the LEDs could be controlled
* directly by the parallel port of a computer, and wrote the
* appropriate software using RTAI to create a stable image. This
* is an attempt to port the demo to Comedi.
*
* It needs much work.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <comedilib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <sys/time.h>
#include "examples.h"
comedi_t *device;
int count;
int out_subd;
#define BUFSZ 1024
sampl_t buf[BUFSZ];
unsigned int chanlist[16];
void prepare_cmd(comedi_t *dev,comedi_cmd *cmd, int subdevice);
void do_cmd(comedi_t *dev,comedi_cmd *cmd);
void do_toggle(void);
void config_output(void)
{
int i;
for(i=0;i<8;i++){
comedi_dio_config(device,out_subd,i,COMEDI_OUTPUT);
}
}
void do_toggle(void)
{
#if 1
comedi_insnlist il;
comedi_insn insn[3];
lsampl_t data[6];
int mask = 0xff;
count++;
il.n_insns = 3;
il.insns = insn;
memset(insn,0,3*sizeof(comedi_insn));
insn[0].insn = INSN_BITS;
insn[0].n = 2;
insn[0].data = data+0;
insn[0].subdev = out_subd;
data[0] = mask;
//data[1] = count;
data[1] = 0xfc;
insn[1].insn = INSN_WAIT;
insn[1].n = 1;
insn[1].data = data+2;
data[2] = 100000-1;
insn[2].insn = INSN_BITS;
insn[2].n = 2;
insn[2].data = data+4;
insn[2].subdev = out_subd;
data[4] = mask;
//data[5] = count;
data[5] = 0xff;
comedi_do_insnlist(device,&il);
#else
unsigned int data;
unsigned int mask = 0xff;
count++;
data = count;
comedi_dio_bitfield(device,out_subd,mask,&data);
#endif
}
int main(int argc, char *argv[])
{
int ret;
comedi_cmd cmd;
struct parsed_options options;
init_parsed_options(&options);
parse_options(&options, argc, argv);
device = comedi_open(options.filename);
if(!device){
perror(options.filename);
exit(1);
}
out_subd = 0;
config_output();
ret = fcntl(comedi_fileno(device),F_SETFL,O_NONBLOCK|O_ASYNC);
if(ret<0)perror("fcntl");
#if 0
{
struct sched_param p;
memset(&p,0,sizeof(p));
p.sched_priority = 1;
ret = sched_setscheduler(0,SCHED_FIFO,&p);
if(ret<0)perror("sched_setscheduler");
}
#endif
prepare_cmd(device, &cmd, options.subdevice);
do_cmd(device,&cmd);
return 0;
}
void do_cmd(comedi_t *dev,comedi_cmd *cmd)
{
int total=0;
int ret;
int go;
fd_set rdset;
struct timeval timeout;
ret=comedi_command_test(dev,cmd);
printf("test ret=%d\n",ret);
if(ret<0){
printf("errno=%d\n",errno);
comedi_perror("comedi_command_test");
return;
}
dump_cmd(stdout,cmd);
ret=comedi_command_test(dev,cmd);
printf("test ret=%d\n",ret);
if(ret<0){
printf("errno=%d\n",errno);
comedi_perror("comedi_command_test");
return;
}
dump_cmd(stdout,cmd);
ret=comedi_command(dev,cmd);
printf("ret=%d\n",ret);
if(ret<0){
printf("errno=%d\n",errno);
comedi_perror("comedi_command");
return;
}
go=1;
while(go){
FD_ZERO(&rdset);
FD_SET(comedi_fileno(dev),&rdset);
timeout.tv_sec = 0;
timeout.tv_usec = 50000;
ret = select(comedi_fileno(dev)+1,&rdset,NULL,NULL,&timeout);
if(ret<0){
perror("select");
}else if(ret==0){
/* timeout */
}else if(FD_ISSET(comedi_fileno(dev),&rdset)){
ret=read(comedi_fileno(dev),buf,BUFSZ);
if(ret<0){
if(errno==EAGAIN){
go = 0;
perror("read");
}
}else if(ret==0){
go = 0;
}else{
//int i;
total+=ret;
//printf("read %d %d\n",ret,total);
//printf("count = %d\n",count);
do_toggle();
#if 0
for(i=0;i<ret;i+=sizeof(sampl_t)){
do_toggle();
}
#endif
}
}
}
}
/*
* This part of the demo measures channels 1, 2, 3, 4 at a rate of
* 10 khz, with the inter-sample time at 10 us (100 khz). The number
* of scans measured is 10. This is analogous to the old mode2
* acquisition.
*/
void prepare_cmd(comedi_t *dev, comedi_cmd *cmd, int subdevice)
{
memset(cmd,0,sizeof(*cmd));
/* the subdevice that the command is sent to */
cmd->subdev = subdevice;
/* flags */
cmd->flags = TRIG_WAKE_EOS;
cmd->start_src = TRIG_NOW;
cmd->start_arg = 0;
cmd->scan_begin_src = TRIG_EXT;
cmd->scan_begin_arg = 0;
#if 0
cmd->convert_src = TRIG_TIMER;
cmd->convert_arg = 1;
#else
cmd->convert_src = TRIG_ANY;
cmd->convert_arg = 0;
#endif
cmd->scan_end_src = TRIG_COUNT;
cmd->scan_end_arg = 1;
cmd->stop_src = TRIG_NONE;
cmd->stop_arg = 0;
cmd->chanlist = chanlist;
cmd->chanlist_len = 1;
chanlist[0]=CR_PACK(0,0,0);
}
|