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dcs.c
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dcs.c
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/* Copyright 2023 Dual Tachyon
* https://github.com/DualTachyon
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dcs.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
const char *dcsNames[] = {"", "CT", "DCS", "DCS"};
const uint16_t CTCSS_Options[50] = {
0x029E, 0x02B5, 0x02CF, 0x02E8, 0x0302, 0x031D, 0x0339, 0x0356, 0x0375,
0x0393, 0x03B4, 0x03CE, 0x03E8, 0x040B, 0x0430, 0x0455, 0x047C, 0x04A4,
0x04CE, 0x04F9, 0x0526, 0x0555, 0x0585, 0x05B6, 0x05EA, 0x061F, 0x063E,
0x0656, 0x0677, 0x068F, 0x06B1, 0x06CA, 0x06ED, 0x0707, 0x072B, 0x0746,
0x076B, 0x0788, 0x07AE, 0x07CB, 0x07F3, 0x0811, 0x083B, 0x0885, 0x08D1,
0x08F3, 0x0920, 0x0972, 0x09C7, 0x09ED,
};
const uint16_t DCS_Options[104] = {
0x0013, 0x0015, 0x0016, 0x0019, 0x001A, 0x001E, 0x0023, 0x0027, 0x0029,
0x002B, 0x002C, 0x0035, 0x0039, 0x003A, 0x003B, 0x003C, 0x004C, 0x004D,
0x004E, 0x0052, 0x0055, 0x0059, 0x005A, 0x005C, 0x0063, 0x0065, 0x006A,
0x006D, 0x006E, 0x0072, 0x0075, 0x007A, 0x007C, 0x0085, 0x008A, 0x0093,
0x0095, 0x0096, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A9, 0x00AA, 0x00AD,
0x00B1, 0x00B3, 0x00B5, 0x00B6, 0x00B9, 0x00BC, 0x00C6, 0x00C9, 0x00CD,
0x00D5, 0x00D9, 0x00DA, 0x00E3, 0x00E6, 0x00E9, 0x00EE, 0x00F4, 0x00F5,
0x00F9, 0x0109, 0x010A, 0x010B, 0x0113, 0x0119, 0x011A, 0x0125, 0x0126,
0x012A, 0x012C, 0x012D, 0x0132, 0x0134, 0x0135, 0x0136, 0x0143, 0x0146,
0x014E, 0x0153, 0x0156, 0x015A, 0x0166, 0x0175, 0x0186, 0x018A, 0x0194,
0x0197, 0x0199, 0x019A, 0x01AC, 0x01B2, 0x01B4, 0x01C3, 0x01CA, 0x01D3,
0x01D9, 0x01DA, 0x01DC, 0x01E3, 0x01EC,
};
static uint32_t DCS_CalculateGolay(uint32_t CodeWord) {
uint32_t Word;
uint8_t i;
Word = CodeWord;
for (i = 0; i < 12; i++) {
Word <<= 1;
if (Word & 0x1000) {
Word ^= 0x08EA;
}
}
return CodeWord | ((Word & 0x0FFE) << 11);
}
uint32_t DCS_GetGolayCodeWord(DCS_CodeType_t CodeType, uint8_t Option) {
uint32_t Code;
Code = DCS_CalculateGolay(DCS_Options[Option] + 0x800U);
if (CodeType == CODE_TYPE_REVERSE_DIGITAL) {
Code ^= 0x7FFFFF;
}
return Code;
}
uint8_t DCS_GetCdcssCode(uint32_t Code) {
uint8_t i;
for (i = 0; i < 23; i++) {
uint32_t Shift;
if (((Code >> 9) & 0x7U) == 4) {
uint8_t j;
for (j = 0; j < ARRAY_SIZE(DCS_Options); j++) {
if (DCS_Options[j] == (Code & 0x1FF)) {
if (DCS_GetGolayCodeWord(2, j) == Code) {
return j;
}
}
}
}
Shift = Code >> 1;
if (Code & 1U) {
Shift |= 0x400000U;
}
Code = Shift;
}
return 0xFF;
}
uint8_t DCS_GetCtcssCode(uint16_t Code) {
uint8_t i;
int Smallest;
uint8_t Result = 0xFF;
Smallest = ARRAY_SIZE(CTCSS_Options);
for (i = 0; i < ARRAY_SIZE(CTCSS_Options); i++) {
int Delta;
Delta = Code - CTCSS_Options[i];
if (Delta < 0) {
Delta = -(Code - CTCSS_Options[i]);
}
if (Delta < Smallest) {
Smallest = Delta;
Result = i;
}
}
return Result;
}