GNSSの初期化
fd = open("/dev/gps", O_RDONLY);
ioctl(fd, CXD56_GNSS_IOCTL_STOP, 0);
ioctl(fd, CXD56_GNSS_IOCTL_SET_OPE_MODE, set_opemode);
ioctl(fd, CXD56_GNSS_IOCTL_SELECT_SATELLITE_SYSTEM,
CXD56_GNSS_SAT_GPS |
CXD56_GNSS_SAT_SBAS |
CXD56_GNSS_SAT_QZ_L1CA |
CXD56_GNSS_SAT_QZ_L1S
);
ioctl(fd, CXD56_GNSS_IOCTL_START, CXD56_GNSS_STMOD_COLD);
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