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-rw-r--r--src/target/firmware/board/gtm900b/afcparams.c47
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diff --git a/src/target/firmware/board/gtm900b/afcparams.c b/src/target/firmware/board/gtm900b/afcparams.c
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+/*
+ * 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.
+ *
+ * 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 representative set of AFC Psi parameters that has been
+ * calibrated by Huawei on a GTM900-B MGC2GSMT module, as recorded
+ * in the /gsm/rf/afcparams file:
+ *
+ * Psi_sta_inv: 13626
+ * Psi_st: 4
+ * Psi_st_32: 252168
+ * Psi_st_inv: 17032
+ *
+ * The following AFC slope number is the closest OsmocomBB-style afc_slope
+ * integer corresponding to these Psi numbers; the true value is somewhere
+ * between 115 and 116.
+ */
+int16_t afc_slope = 115;
+
+/*
+ * 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;