Diffstat (limited to 'src/target/firmware/board/gta0x/afcparams.c')
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
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+ * This code was written by Mychaela Falconia <email@example.com>
+ * 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 <firstname.lastname@example.org>
+ * 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.
+ * 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;