mayhem-firmware/firmware/baseband/proc_rds.hpp

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 * 
 * This file is part of PortaPack.
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __PROC_RDS_H__
#define __PROC_RDS_H__

#include "baseband_processor.hpp"

#define SAMPLES_PER_BIT 192
#define FILTER_SIZE 576
#define SAMPLE_BUFFER_SIZE SAMPLES_PER_BIT + FILTER_SIZE

class RDSProcessor : public BasebandProcessor {
public:
	void execute(const buffer_c8_t& buffer) override;

private:
	int8_t re, im;
	uint8_t mphase, s;
    uint32_t bit_pos;
    int32_t sample_buffer[SAMPLE_BUFFER_SIZE] = {0};
    int32_t val;
    uint8_t prev_output = 0;
    uint8_t cur_output = 0;
    uint8_t cur_bit = 0;
    int sample_count = SAMPLES_PER_BIT;
    int in_sample_index = 0;
    int32_t sample;
    int out_sample_index = SAMPLE_BUFFER_SIZE - 1;
	uint32_t phase, sphase;
	int32_t sig, frq, frq_im, rdsc;
	int32_t k;

	const int32_t waveform_biphase[576] = {
		165,167,168,168,167,166,163,160,
		157,152,147,141,134,126,118,109,
		99,88,77,66,53,41,27,14,
		0,-14,-29,-44,-59,-74,-89,-105,
		-120,-135,-150,-165,-179,-193,-206,-218,
		-231,-242,-252,-262,-271,-279,-286,-291,
		-296,-299,-301,-302,-302,-300,-297,-292,
		-286,-278,-269,-259,-247,-233,-219,-202,
		-185,-166,-145,-124,-101,-77,-52,-26,
		0,27,56,85,114,144,175,205,
		236,266,296,326,356,384,412,439,
		465,490,513,535,555,574,590,604,
		616,626,633,637,639,638,633,626,
		616,602,586,565,542,515,485,451,
		414,373,329,282,232,178,121,62,
		0,-65,-132,-202,-274,-347,-423,-500,
		-578,-656,-736,-815,-894,-973,-1051,-1128,
		-1203,-1276,-1347,-1415,-1479,-1540,-1596,-1648,
		-1695,-1736,-1771,-1799,-1820,-1833,-1838,-1835,
		-1822,-1800,-1767,-1724,-1670,-1605,-1527,-1437,
		-1334,-1217,-1087,-943,-785,-611,-423,-219,
		0,235,487,755,1040,1341,1659,1994,
		2346,2715,3101,3504,3923,4359,4811,5280,
		5764,6264,6780,7310,7856,8415,8987,9573,
		10172,10782,11404,12036,12678,13329,13989,14656,
		15330,16009,16694,17382,18074,18767,19461,20155,
		20848,21539,22226,22909,23586,24256,24918,25571,
		26214,26845,27464,28068,28658,29231,29787,30325,
		30842,31339,31814,32266,32694,33097,33473,33823,
		34144,34437,34699,34931,35131,35299,35434,35535,
		35602,35634,35630,35591,35515,35402,35252,35065,
		34841,34579,34279,33941,33566,33153,32702,32214,
		31689,31128,30530,29897,29228,28525,27788,27017,
		26214,25379,24513,23617,22693,21740,20761,19755,
		18725,17672,16597,15501,14385,13251,12101,10935,
		9755,8563,7360,6148,4927,3701,2470,1235,
		0,-1235,-2470,-3701,-4927,-6148,-7360,-8563,
		-9755,-10935,-12101,-13251,-14385,-15501,-16597,-17672,
		-18725,-19755,-20761,-21740,-22693,-23617,-24513,-25379,
		-26214,-27017,-27788,-28525,-29228,-29897,-30530,-31128,
		-31689,-32214,-32702,-33153,-33566,-33941,-34279,-34579,
		-34841,-35065,-35252,-35402,-35515,-35591,-35630,-35634,
		-35602,-35535,-35434,-35299,-35131,-34931,-34699,-34437,
		-34144,-33823,-33473,-33097,-32694,-32266,-31814,-31339,
		-30842,-30325,-29787,-29231,-28658,-28068,-27464,-26845,
		-26214,-25571,-24918,-24256,-23586,-22909,-22226,-21539,
		-20848,-20155,-19461,-18767,-18074,-17382,-16694,-16009,
		-15330,-14656,-13989,-13329,-12678,-12036,-11404,-10782,
		-10172,-9573,-8987,-8415,-7856,-7310,-6780,-6264,
		-5764,-5280,-4811,-4359,-3923,-3504,-3101,-2715,
		-2346,-1994,-1659,-1341,-1040,-755,-487,-235,
		0,219,423,611,785,943,1087,1217,
		1334,1437,1527,1605,1670,1724,1767,1800,
		1822,1835,1838,1833,1820,1799,1771,1736,
		1695,1648,1596,1540,1479,1415,1347,1276,
		1203,1128,1051,973,894,815,736,656,
		578,500,423,347,274,202,132,65,
		0,-62,-121,-178,-232,-282,-329,-373,
		-414,-451,-485,-515,-542,-565,-586,-602,
		-616,-626,-633,-638,-639,-637,-633,-626,
		-616,-604,-590,-574,-555,-535,-513,-490,
		-465,-439,-412,-384,-356,-326,-296,-266,
		-236,-205,-175,-144,-114,-85,-56,-27,
		0,26,52,77,101,124,145,166,
		185,202,219,233,247,259,269,278,
		286,292,297,300,302,302,301,299,
		296,291,286,279,271,262,252,242,
		231,218,206,193,179,165,150,135,
		120,105,89,74,59,44,29,14,
		0,-14,-27,-41,-53,-66,-77,-88,
		-99,-109,-118,-126,-134,-141,-147,-152,
		-157,-160,-163,-166,-167,-168,-168,-167
	};

};

#endif