mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-11 00:34:29 -05:00
140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "rds.hpp"
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#include "portapack_shared_memory.hpp"
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namespace rds {
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uint32_t makeblock(uint32_t blockdata, uint16_t offset) {
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uint16_t CRC = 0;
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uint8_t doinv;
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for (uint8_t i = 0; i < 16; i++) {
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doinv = (((blockdata << i) & 0x8000) >> 15) ^ (CRC >> 9);
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if (doinv) CRC ^= 0b0011011100;
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CRC = ((CRC << 1) | doinv) & 0x3FF;
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}
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return (blockdata << 10) | (CRC ^ offset);
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}
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// Todo:
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// Make PI
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// TA/TP flags
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// Group selection
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// Boolean to binary
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uint8_t b2b(const bool in) {
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if (in)
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return 1;
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else
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return 0;
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}
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void make_0B_group(uint32_t group[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool TA,
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const bool MS, const bool DI, const uint8_t C, const char * chars) {
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group[0] = PI_code;
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group[1] = (0x0 << 12) | (1 << 11) | (b2b(TP) << 10) | (PTY << 5) | (b2b(TA) << 4) | (b2b(MS) << 3) | (b2b(DI) << 2) | (C & 3);
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group[2] = PI_code;
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group[3] = (chars[0] << 8) | chars[1];
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}
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void make_2A_group(uint32_t group[], const uint16_t PI_code, const bool TP, const uint8_t PTY, const bool AB,
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const uint8_t segment, const char * chars) {
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group[0] = PI_code;
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group[1] = (0x0 << 12) | (1 << 11) | (b2b(TP) << 10) | (PTY << 5) | (b2b(AB) << 4) | (segment & 15);
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group[2] = (chars[0] << 8) | chars[1];
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group[3] = (chars[2] << 8) | chars[3];
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}
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uint16_t gen_PSN(const char * psname, const uint8_t pty) {
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uint8_t c;
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uint32_t group[4][4] = { 0 };
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// 4 groups with 2 PSN characters in each
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make_0B_group(&group[0][0], 0xF849, true, pty, false, true, false, 0, &psname[0]);
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make_0B_group(&group[1][0], 0xF849, true, pty, false, true, false, 1, &psname[2]);
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make_0B_group(&group[2][0], 0xF849, true, pty, false, true, false, 2, &psname[4]);
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make_0B_group(&group[3][0], 0xF849, true, pty, false, true, false, 3, &psname[6]);
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// Generate checkbits for all blocks
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for (c = 0; c < 4; c++) {
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group[c][0] = makeblock(group[c][0], RDS_OFFSET_A);
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group[c][1] = makeblock(group[c][1], RDS_OFFSET_B);
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group[c][2] = makeblock(group[c][2], RDS_OFFSET_Cp); // C' !
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group[c][3] = makeblock(group[c][3], RDS_OFFSET_D);
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}
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uint32_t * tx_data_u32 = (uint32_t*)shared_memory.tx_data;
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for (c = 0; c < 4 * 4; c++)
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tx_data_u32[c] = group[c >> 2][c & 3];
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return 4 * 4 * 26;
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}
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uint16_t gen_RadioText(const char * radiotext, const uint8_t pty) {
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size_t c, i;
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uint32_t * group;
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char radiotext_buffer[65] = { 0 };
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uint8_t rtlen, groups;
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strcpy(radiotext_buffer, radiotext);
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rtlen = strlen(radiotext_buffer);
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radiotext_buffer[rtlen] = 0x0D;
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// Pad to multiple of 4
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while (rtlen & 3)
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radiotext_buffer[rtlen++] = ' ';
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groups = rtlen >> 2; // 4 characters per group
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group = (uint32_t*)chHeapAlloc(0x0, 4 * groups * sizeof(uint32_t));
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for (c = 0; c < groups; c++)
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make_2A_group(&group[c << 2], 0xF849, true, pty, false, c, &radiotext_buffer[c * 4]);
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// Generate checkbits
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for (c = 0; c < groups; c++) {
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i = c * 4;
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group[i + 0] = makeblock(group[i + 0], RDS_OFFSET_A);
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group[i + 1] = makeblock(group[i + 1], RDS_OFFSET_B);
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group[i + 2] = makeblock(group[i + 2], RDS_OFFSET_C);
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group[i + 3] = makeblock(group[i + 3], RDS_OFFSET_D);
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}
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uint32_t * tx_data_u32 = (uint32_t*)shared_memory.tx_data;
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for (c = 0; c < (groups * 4); c++)
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tx_data_u32[c] = group[c];
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return groups * 4 * 26;
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}
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} /* namespace rds */
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