1 files changed, 52 insertions, 0 deletions
diff --git a/src/target/firmware/board/tr800/afcparams.c b/src/target/firmware/board/tr800/afcparams.c
new file mode 100644
index 00000000..ccbb3608
--- /dev/null
+++ b/src/target/firmware/board/tr800/afcparams.c
@@ -0,0 +1,52 @@
+/*
+ * 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.
+ */
+
+#include <stdint.h>
+#include <rf/vcxocal.h>
+
+/*
+ * Here is a representative set of AFC Psi parameters that has been
+ * calibrated by iWOW's factory on a TR-800 module, as recorded
+ * in the /gsm/rf/afcparams file:
+ *
+ * Psi_sta_inv: 4387
+ * Psi_st: 12
+ * Psi_st_32: 783154
+ * Psi_st_inv: 5484
+ *
+ * The following AFC slope number is the closest OsmocomBB-style afc_slope
+ * integer corresponding to these Psi numbers; the true value is somewhere
+ * between 358 and 359.
+ *
+ * Please note that all AFC parameters (both Psi and linear) have been
+ * calibrated per unit by iWOW's factory, and they do differ from unit
+ * to unit.  Both iWOW and FreeCalypso firmwares make direct use of
+ * per-unit calibrated numbers, but OsmocomBB architecture cannot make
+ * use of them - hence AFC performance with OBB may be significantly
+ * poorer than with either iWOW or FC firmware.  The present code has
+ * been contributed by Mother Mychaela solely as a harm reduction measure,
+ * and does NOT constitute any kind of approved production solution -
+ * you've been warned!
+ */
+int16_t afc_slope = 358;
+
+/*
+ * 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;