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1 changed files with 50 additions and 16 deletions
66
demo/insn.c
66
demo/insn.c
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/*
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A little input demo
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This example shows how to use instructions, i.e., comedi_insns.
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Using instructions directly, as in this example, is not recommended
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for the beginner. Use the higher-level functions such as
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comedi_data_read(), comedi_data_write(), etc. Then, if you
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need the additional flexibility that using instructions directly
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provides, study this example and the implementations of
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comedi_data_read(), etc.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ctype.h>
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#include <sys/time.h>
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#include <unistd.h>
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extern int verbose_flag;
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extern int subdevice;
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comedi_t *device;
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/*
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* This example does 3 instructions in one system call. It does
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* a gettimeofday() call, then reads N_SAMPLES samples from an
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* analog input, and the another gettimeofday() call.
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*
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*/
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#define N_SAMPLES 10
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int main(int argc, char *argv[])
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{
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int ret;
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comedi_insn insn;
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int ret,i;
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comedi_insn insn[3];
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comedi_insnlist il;
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lsampl_t data;
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struct timeval t1,t2;
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lsampl_t data[N_SAMPLES];
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parse_options(argc,argv);
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filename,subdevice,channel,range,aref);
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}
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il.n_insns=1;
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il.insns=&insn;
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/* Set up a the "instruction list", which is just a pointer
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* to the array of instructions and the number of instructions.
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*/
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il.n_insns=3;
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il.insns=insn;
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insn.insn=INSN_READ;
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insn.n=1;
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insn.data=&data;
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insn.subdev=subdevice;
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insn.chanspec=CR_PACK(channel,range,aref);
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/* Instruction 0: perform a gettimeofday() */
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insn[0].insn=INSN_GTOD;
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insn[0].n=2;
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insn[0].data=(void *)&t1;
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ret=ioctl(comedi_fileno(device),COMEDI_INSNLIST,&il);
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//ret=comedi_data_read(device,subdevice,channel,range,aref,&data);
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/* Instruction 1: do 10 analog input reads */
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insn[1].insn=INSN_READ;
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insn[1].n=N_SAMPLES;
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insn[1].data=data;
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insn[1].subdev=subdevice;
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insn[1].chanspec=CR_PACK(channel,range,aref);
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/* Instruction 2: perform a gettimeofday() */
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insn[2].insn=INSN_GTOD;
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insn[2].n=2;
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insn[2].data=(void *)&t2;
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ret=comedi_do_insnlist(device,&il);
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if(ret<0){
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comedi_perror(filename);
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exit(0);
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}
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printf("%d\n",data);
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printf("initial time: %ld.%06ld\n",t1.tv_sec,t1.tv_usec);
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for(i=0;i<N_SAMPLES;i++){
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printf("%d\n",data[i]);
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}
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printf("final time: %ld.%06ld\n",t2.tv_sec,t2.tv_usec);
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return 0;
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}
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