/* * This code was written by Mychaela Falconia * 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 #include /* * 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;