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Diffstat (limited to 'rrlp-ephemeris/gps.c')
| -rw-r--r-- | rrlp-ephemeris/gps.c | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/rrlp-ephemeris/gps.c b/rrlp-ephemeris/gps.c deleted file mode 100644 index c23574840..000000000 --- a/rrlp-ephemeris/gps.c +++ /dev/null @@ -1,126 +0,0 @@ -/* - * gps.c - * - * A few utility functions to deal with low level GPS data - * - * - * Copyright (C) 2009 Sylvain Munaut <tnt@246tNt.com> - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#include "gps.h" - - -#define GET_FIELD_U(w, nb, pos) (((w) >> (pos)) & ((1<<(nb))-1)) -#define GET_FIELD_S(w, nb, pos) (((int)((w) << (32-(nb)-(pos)))) >> (32-(nb))) - -/* - * Unpacks GPS Subframe 1,2,3 payloads (3 * 8 words) - * - * Note: eph->sv_id is not filled here since not present in those subframes - * - * (no parity bit checking is done, only the lower 24 bits of each word - * are used) - */ -int -gps_unpack_sf123(uint32_t *sf, struct gps_ephemeris_sv *eph) -{ - uint32_t *sf1 = &sf[0]; - uint32_t *sf2 = &sf[8]; - uint32_t *sf3 = &sf[16]; - - int iode1, iode2; - - eph->week_no = GET_FIELD_U(sf1[0], 10, 14); - eph->code_on_l2 = GET_FIELD_U(sf1[0], 2, 12); - eph->sv_ura = GET_FIELD_U(sf1[0], 4, 8); - eph->sv_health = GET_FIELD_U(sf1[0], 6, 2); - eph->l2_p_flag = GET_FIELD_U(sf1[1], 1, 23); - eph->t_gd = GET_FIELD_S(sf1[4], 8, 0); - eph->iodc = (GET_FIELD_U(sf1[0], 2, 0) << 8) | \ - GET_FIELD_U(sf1[5], 8, 16); - eph->t_oc = GET_FIELD_U(sf1[5], 16, 0); - eph->a_f2 = GET_FIELD_S(sf1[6], 8, 16); - eph->a_f1 = GET_FIELD_S(sf1[6], 16, 0); - eph->a_f0 = GET_FIELD_S(sf1[7], 22, 2); - - iode1 = GET_FIELD_U(sf2[0], 8, 16); - eph->c_rs = GET_FIELD_S(sf2[0], 16, 0); - eph->delta_n = GET_FIELD_S(sf2[1], 16, 8); - eph->m_0 = (GET_FIELD_S(sf2[1], 8, 0) << 24) | \ - GET_FIELD_U(sf2[2], 24, 0); - eph->c_uc = GET_FIELD_S(sf2[3], 16, 8); - eph->e = (GET_FIELD_U(sf2[3], 8, 0) << 24) | \ - GET_FIELD_U(sf2[4], 24, 0); - eph->c_us = GET_FIELD_S(sf2[5], 16, 8); - eph->a_powhalf = (GET_FIELD_U(sf2[5], 8, 0) << 24) | \ - GET_FIELD_U(sf2[6], 24, 0); - eph->t_oe = GET_FIELD_U(sf2[7], 16, 8); - eph->fit_flag = GET_FIELD_U(sf2[7], 1, 7); - - eph->c_ic = GET_FIELD_S(sf3[0], 16, 8); - eph->omega_0 = (GET_FIELD_S(sf3[0], 8, 0) << 24) | \ - GET_FIELD_U(sf3[1], 24, 0); - eph->c_is = GET_FIELD_S(sf3[2], 16, 8); - eph->i_0 = (GET_FIELD_S(sf3[2], 8, 0) << 24) | \ - GET_FIELD_U(sf3[3], 24, 0); - eph->c_rc = GET_FIELD_S(sf3[4], 16, 8); - eph->w = (GET_FIELD_S(sf3[4], 8, 0) << 24) | \ - GET_FIELD_U(sf3[5], 24, 0); - eph->omega_dot = GET_FIELD_S(sf3[6], 24, 0); - iode2 = GET_FIELD_U(sf3[7], 8, 16); - eph->idot = GET_FIELD_S(sf3[7], 14, 2); - - eph->_rsvd1 = GET_FIELD_U(sf1[1], 23, 0); - eph->_rsvd2 = GET_FIELD_U(sf1[2], 24, 0); - eph->_rsvd3 = GET_FIELD_U(sf1[3], 24, 0); - eph->_rsvd4 = GET_FIELD_U(sf1[4], 16, 8); - eph->aodo = GET_FIELD_U(sf2[7], 5, 2); - - /* Check & cross-validate iodc[7:0], iode1, iode2 */ - if ((iode1 != iode2) || (iode1 != (eph->iodc & 0xff))) - return -1; - - return 0; -} - - -/* - * Unpacks GPS Subframe 4 or 5 Almanac pages payload (8 words) - * - * (no parity bit checking is done, only the lower 24 bits of each word - * are used) - */ -int -gps_unpack_sf45_almanac(uint32_t *sf, struct gps_almanac_sv *alm) -{ - alm->sv_id = GET_FIELD_U(sf[0], 6, 16); - - alm->e = GET_FIELD_U(sf[0], 16, 0); - alm->t_oa = GET_FIELD_U(sf[1], 8, 16); - alm->ksii = GET_FIELD_S(sf[1], 16, 0); - alm->omega_dot = GET_FIELD_S(sf[2], 16, 8); - alm->sv_health = GET_FIELD_U(sf[2], 8, 0); - alm->a_powhalf = GET_FIELD_U(sf[3], 24, 0); - alm->omega_0 = GET_FIELD_S(sf[4], 24, 0); - alm->w = GET_FIELD_S(sf[5], 24, 0); - alm->m_0 = GET_FIELD_S(sf[6], 24, 0); - alm->a_f0 = (GET_FIELD_S(sf[7], 8, 16) << 3) | \ - GET_FIELD_U(sf[7], 3, 2); - alm->a_f1 = GET_FIELD_S(sf[7], 11, 5); - - return 0; -} - |