mirror of
https://github.com/phdlee/uvk5cec
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114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/* Copyright 2023 Dual Tachyon
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* https://github.com/DualTachyon
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dcs.h"
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
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#endif
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// CTCSS Hz * 10
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const uint16_t CTCSS_Options[50] = {
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670, 693, 719, 744, 770, 797, 825, 854, 885, 915,
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948, 974, 1000, 1035, 1072, 1109, 1148, 1188, 1230, 1273,
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1318, 1365, 1413, 1462, 1514, 1567, 1598, 1622, 1655, 1679,
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1713, 1738, 1773, 1799, 1835, 1862, 1899, 1928, 1966, 1995,
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2035, 2065, 2107, 2181, 2257, 2291, 2336, 2418, 2503, 2541
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};
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const uint16_t DCS_Options[104] = {
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0x0013, 0x0015, 0x0016, 0x0019, 0x001A, 0x001E, 0x0023, 0x0027,
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0x0029, 0x002B, 0x002C, 0x0035, 0x0039, 0x003A, 0x003B, 0x003C,
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0x004C, 0x004D, 0x004E, 0x0052, 0x0055, 0x0059, 0x005A, 0x005C,
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0x0063, 0x0065, 0x006A, 0x006D, 0x006E, 0x0072, 0x0075, 0x007A,
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0x007C, 0x0085, 0x008A, 0x0093, 0x0095, 0x0096, 0x00A3, 0x00A4,
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0x00A5, 0x00A6, 0x00A9, 0x00AA, 0x00AD, 0x00B1, 0x00B3, 0x00B5,
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0x00B6, 0x00B9, 0x00BC, 0x00C6, 0x00C9, 0x00CD, 0x00D5, 0x00D9,
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0x00DA, 0x00E3, 0x00E6, 0x00E9, 0x00EE, 0x00F4, 0x00F5, 0x00F9,
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0x0109, 0x010A, 0x010B, 0x0113, 0x0119, 0x011A, 0x0125, 0x0126,
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0x012A, 0x012C, 0x012D, 0x0132, 0x0134, 0x0135, 0x0136, 0x0143,
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0x0146, 0x014E, 0x0153, 0x0156, 0x015A, 0x0166, 0x0175, 0x0186,
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0x018A, 0x0194, 0x0197, 0x0199, 0x019A, 0x01AC, 0x01B2, 0x01B4,
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0x01C3, 0x01CA, 0x01D3, 0x01D9, 0x01DA, 0x01DC, 0x01E3, 0x01EC,
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};
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static uint32_t DCS_CalculateGolay(uint32_t CodeWord)
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{
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unsigned int i;
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uint32_t Word = CodeWord;
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for (i = 0; i < 12; i++)
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{
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Word <<= 1;
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if (Word & 0x1000)
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Word ^= 0x08EA;
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}
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return CodeWord | ((Word & 0x0FFE) << 11);
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}
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uint32_t DCS_GetGolayCodeWord(DCS_CodeType_t CodeType, uint8_t Option)
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{
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uint32_t Code = DCS_CalculateGolay(DCS_Options[Option] + 0x800U);
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if (CodeType == CODE_TYPE_REVERSE_DIGITAL)
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Code ^= 0x7FFFFF;
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return Code;
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}
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uint8_t DCS_GetCdcssCode(uint32_t Code)
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{
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unsigned int i;
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for (i = 0; i < 23; i++)
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{
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uint32_t Shift;
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if (((Code >> 9) & 0x7U) == 4)
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{
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unsigned int j;
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for (j = 0; j < ARRAY_SIZE(DCS_Options); j++)
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if (DCS_Options[j] == (Code & 0x1FF))
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if (DCS_GetGolayCodeWord(2, j) == Code)
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return j;
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}
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Shift = Code >> 1;
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if (Code & 1U)
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Shift |= 0x400000U;
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Code = Shift;
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}
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return 0xFF;
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}
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uint8_t DCS_GetCtcssCode(int Code)
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{
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unsigned int i;
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uint8_t Result = 0xFF;
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int Smallest = ARRAY_SIZE(CTCSS_Options);
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for (i = 0; i < ARRAY_SIZE(CTCSS_Options); i++)
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{
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int Delta = Code - CTCSS_Options[i];
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if (Delta < 0)
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Delta = -(Code - CTCSS_Options[i]);
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if (Smallest > Delta)
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{
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Smallest = Delta;
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Result = i;
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}
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}
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return Result;
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}
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