c45f319171
Try and avoid arithmetic overflow when converting the difference between two INSN_GTOD timestamps to a signed number of microseconds.
80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
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#include <stdio.h>
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#include <comedilib.h>
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#include <fcntl.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 <math.h>
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#include <sys/time.h>
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#include <string.h>
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#include "comedi_test.h"
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int test_insn_read_time(void)
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{
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comedi_insn insn[3];
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comedi_insnlist il;
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lsampl_t t1[2],t2[2];
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lsampl_t data;
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long diffus;
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int save_errno;
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int ret;
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printf("rev 1\n");
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if(comedi_get_subdevice_type(device,subdevice)==COMEDI_SUBD_UNUSED){
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printf("not applicable\n");
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return 0;
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}
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memset(&il,0,sizeof(il));
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memset(insn,0,sizeof(insn));
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il.n_insns = 3;
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il.insns = insn;
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insn[0].insn = INSN_GTOD;
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insn[0].n=2;
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insn[0].data = t1;
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insn[1].subdev = subdevice;
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insn[1].insn = INSN_READ;
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insn[1].n = 1;
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insn[1].chanspec = CR_PACK(0,0,0);
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insn[1].data = &data;
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insn[2].insn = INSN_GTOD;
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insn[2].n=2;
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insn[2].data = t2;
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ret = comedi_do_insnlist(device,&il);
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save_errno = errno;
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printf("comedi_do_insn: %d\n",ret);
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if(ret<0){
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printf("W: comedi_do_insn: errno=%d %s\n",save_errno,strerror(save_errno));
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}
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if(ret<2){
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printf("W: comedi_do_insn: returned %d (expected 3)\n",ret);
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}
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if (t2[0] >= t1[0]) {
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diffus = (long)(t2[0] - t1[0]);
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} else {
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diffus = -(long)(t1[0] - t2[0]);
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}
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diffus *= 1000000;
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if (t2[1] >= t1[1]) {
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diffus += (long)(t2[1] - t1[1]);
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} else {
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diffus -= (long)(t1[1] - t2[1]);
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}
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printf("read time: %ld us\n", diffus);
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return 0;
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}
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