diff options
Diffstat (limited to 'src/target/firmware/board/gta0x/afcparams.c')
-rw-r--r-- | src/target/firmware/board/gta0x/afcparams.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/target/firmware/board/gta0x/afcparams.c b/src/target/firmware/board/gta0x/afcparams.c new file mode 100644 index 00000000..ba48360d --- /dev/null +++ b/src/target/firmware/board/gta0x/afcparams.c @@ -0,0 +1,53 @@ +/* + * This code was written by Mychaela Falconia <falcon@freecalypso.org> + * who refuses to claim copyright on it and has released it as public domain + * instead. NO rights reserved, all rights relinquished. + * + * Tweaked (coding style changes) by Vadim Yanitskiy <axilirator@gmail.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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <stdint.h> +#include <rf/vcxocal.h> + +/* + * Here is a typical set of AFC Psi parameters for an FCDEV3B modem board, + * computed by FreeCalypso fc-rfcal-vcxo calibration tool from frequency + * offset measurements made with a CMU200 RF tester: + * + * Psi_sta_inv: 3462 + * Psi_st: 15 + * Psi_st_32: 992326 + * Psi_st_inv: 4328 + * + * The following AFC slope number is the closest OsmocomBB-style afc_slope + * integer corresponding to these Psi numbers; the true value is somewhere + * between 454 and 455. + * + * This AFC slope setting is expected to be correct for both Openmoko and + * FreeCalypso hardware as we use the same VCXO components as were used + * by Openmoko. + */ +int16_t afc_slope = 454; + +/* + * The compiled-in AFC initial DAC value below is the same as was used by + * the old OsmocomBB code written for Mot C1xx phones, but it will normally + * be overridden by the per-unit factory calibration value read from the + * /gsm/rf/afcdac file in FFS. + */ +int16_t afc_initial_dac_value = -700; |