1 /* 2 3 Try to run this program to see what the PPS-API finds. You give it the 4 device as argument and you may have to modify the pp.mode = BLA assignment. 5 6 Poul-Henning 7 8 */ 9 10 #include <stdio.h> 11 #include <errno.h> 12 #include <fcntl.h> 13 #include <err.h> 14 #include <sys/types.h> 15 #include <time.h> 16 #include <sys/timepps.h> 17 #include <sys/termios.h> 18 19 #define timespecsub(vvp, uvp) \ 20 do { \ 21 (vvp)->tv_sec -= (uvp)->tv_sec; \ 22 (vvp)->tv_nsec -= (uvp)->tv_nsec; \ 23 if ((vvp)->tv_nsec < 0) { \ 24 (vvp)->tv_sec--; \ 25 (vvp)->tv_nsec += 1000000000; \ 26 } \ 27 } while (0) 28 29 30 void Chew(struct timespec * tsa,struct timespec * tsc,unsigned sa,unsigned sc)31 Chew(struct timespec *tsa, struct timespec *tsc, unsigned sa, unsigned sc) 32 { 33 static int idx; 34 struct timespec ts; 35 36 printf("%d.%09d ", tsa->tv_sec, tsa->tv_nsec); 37 printf("%d.%09d ", tsc->tv_sec, tsc->tv_nsec); 38 printf("%u %u ", sa, sc); 39 40 ts = *tsc; 41 timespecsub(&ts,tsa); 42 printf("%.9f ", ts.tv_sec + ts.tv_nsec / 1e9); 43 printf("\n"); 44 fflush(stdout); 45 } 46 47 int main(int argc,char ** argv)48 main(int argc, char **argv) 49 { 50 int fd; 51 pps_info_t pi; 52 pps_params_t pp; 53 pps_handle_t ph; 54 int i, mode; 55 u_int olda, oldc; 56 double d = 0; 57 struct timespec to; 58 59 if (argc < 2) 60 argv[1] = "/dev/cuaa1"; 61 setbuf(stdout, 0); 62 fd = open(argv[1], O_RDONLY); 63 if (fd < 0) 64 err(1, argv[1]); 65 i = time_pps_create(fd, &ph); 66 if (i < 0) 67 err(1, "time_pps_create"); 68 69 i = time_pps_getcap(ph, &mode); 70 if (i < 0) 71 err(1, "time_pps_getcap"); 72 73 pp.mode = PPS_CAPTUREASSERT | PPS_ECHOASSERT; 74 pp.mode = PPS_CAPTUREBOTH; 75 /* pp.mode = PPS_CAPTUREASSERT; */ 76 77 i = time_pps_setparams(ph, &pp); 78 if (i < 0) 79 err(1, "time_pps_setparams"); 80 81 while (1) { 82 to.tv_nsec = 0; 83 to.tv_sec = 0; 84 i = time_pps_fetch(ph, PPS_TSFMT_TSPEC, &pi, &to); 85 if (i < 0) 86 err(1, "time_pps_fetch"); 87 if (olda == pi.assert_sequence && 88 oldc == pi.clear_sequence) { 89 usleep(10000); 90 continue; 91 } 92 93 Chew(&pi.assert_timestamp, &pi.clear_timestamp, 94 pi.assert_sequence, pi.clear_sequence); 95 olda = pi.assert_sequence; 96 oldc = pi.clear_sequence; 97 } 98 99 return(0); 100 } 101