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phc2sys: disentangle the PPS loop from the read_phc loop. 

The main loop has become a bit messy, mixing two completely disjunct code
paths. This patch separates the two use cases for the sake of clarity.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2012-09-25 20:00:32 +02:00
parent 99d7c128a1
commit c890a4b935
1 changed files with 34 additions and 26 deletions
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60
phc2sys.c
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@ -191,6 +191,28 @@ static int read_pps(int fd, int64_t *offset, uint64_t *ts)
return 1;
}
static int do_pps_loop(char *pps_device, double kp, double ki, clockid_t dst)
{
int64_t pps_offset;
uint64_t pps_ts;
int fd;
fd = open(pps_device, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "cannot open '%s': %m\n", pps_device);
return -1;
}
while (1) {
if (!read_pps(fd, &pps_offset, &pps_ts)) {
continue;
}
printf("pps %9lld ", pps_offset);
do_servo(&servo, dst, pps_offset, pps_ts, kp, ki);
}
close(fd);
return 0;
}
static void usage(char *progname)
{
fprintf(stderr,
@ -213,9 +235,9 @@ int main(int argc, char *argv[])
double kp = KP, ki = KI;
char *device = NULL, *progname;
clockid_t src = CLOCK_INVALID, dst = CLOCK_REALTIME;
uint64_t pps_ts, phc_ts;
int64_t pps_offset, phc_offset;
int c, fd = 0, phc_readings = 5, phc_rate = 1;
uint64_t phc_ts;
int64_t phc_offset;
int c, phc_readings = 5, phc_rate = 1;
/* Process the command line arguments. */
progname = strrchr(argv[0], '/');
@ -256,13 +278,6 @@ int main(int argc, char *argv[])
usage(progname);
return -1;
}
if (device) {
fd = open(device, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "cannot open %s: %m\n", device);
return -1;
}
}
if (src != CLOCK_INVALID) {
struct timespec now;
if (clock_gettime(src, &now))
@ -270,24 +285,17 @@ int main(int argc, char *argv[])
if (clock_settime(dst, &now))
perror("clock_settime");
}
if (device)
return do_pps_loop(device, kp, ki, dst);
while (1) {
if (fd > 0) {
if (!read_pps(fd, &pps_offset, &pps_ts))
continue;
printf("pps %9lld ", pps_offset);
} else
usleep(1000000 / phc_rate);
if (src != CLOCK_INVALID) {
if (!read_phc(src, dst, phc_readings, &phc_offset, &phc_ts))
continue;
printf("phc %9lld ", phc_offset);
usleep(1000000 / phc_rate);
if (!read_phc(src, dst, phc_readings, &phc_offset, &phc_ts)) {
continue;
}
if (fd > 0)
do_servo(&servo, dst, pps_offset, pps_ts, kp, ki);
else
do_servo(&servo, dst, phc_offset, phc_ts, kp, ki);
printf("phc %9lld ", phc_offset);
do_servo(&servo, dst, phc_offset, phc_ts, kp, ki);
}
return 0;
}