Work on NXDN CRC routines.
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NXDNCRC.cpp
89
NXDNCRC.cpp
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@ -17,6 +17,7 @@
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*/
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#include "NXDNCRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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@ -28,6 +29,7 @@ const uint16_t BIT_MASK_TABLE2[] = { 0x8000U, 0x4000U, 0x2000U, 0x1000U, 0x0800U
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE1[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE1[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE1[(i)&7])
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#define WRITE_BIT2(p,i,b) p[(i)>>4] = (b) ? (p[(i)>>4] | BIT_MASK_TABLE2[(i)&15]) : (p[(i)>>3] & ~BIT_MASK_TABLE2[(i)&15])
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#define READ_BIT2(p,i) (p[(i)>>4] & BIT_MASK_TABLE2[(i)&15])
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bool CNXDNCRC::checkCRC6(const unsigned char* in, unsigned int length)
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@ -37,6 +39,16 @@ bool CNXDNCRC::checkCRC6(const unsigned char* in, unsigned int length)
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uint8_t crc[1U];
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crc[0U] = createCRC6(in, length);
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uint8_t temp[1U];
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temp[0U] = 0x00U;
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unsigned int j = length;
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for (unsigned int i = 0U; i < 6U; i++, j++) {
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bool b = READ_BIT1(in, j);
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WRITE_BIT1(temp, i, b);
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}
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LogMessage("NXDN, CRC6: new:%02X old:%02X", crc[0U], temp[0U]);
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unsigned int n = length;
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for (unsigned int i = 0U; i < 6U; i++, n++) {
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bool b1 = READ_BIT1(crc, i);
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@ -69,6 +81,16 @@ bool CNXDNCRC::checkCRC12(const unsigned char* in, unsigned int length)
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uint16_t crc[1U];
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crc[0U] = createCRC12(in, length);
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uint16_t temp[1U];
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temp[0U] = 0x00U;
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unsigned int j = length;
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for (unsigned int i = 0U; i < 12U; i++, j++) {
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bool b = READ_BIT1(in, j);
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WRITE_BIT2(temp, i, b);
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}
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LogMessage("NXDN, CRC12: new:%04X old:%04X", crc[0U], temp[0U]);
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unsigned int n = length;
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for (unsigned int i = 0U; i < 12U; i++, n++) {
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bool b1 = READ_BIT2(crc, i);
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@ -101,6 +123,16 @@ bool CNXDNCRC::checkCRC15(const unsigned char* in, unsigned int length)
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uint16_t crc[1U];
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crc[0U] = createCRC15(in, length);
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uint16_t temp[1U];
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temp[0U] = 0x00U;
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unsigned int j = length;
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for (unsigned int i = 0U; i < 15U; i++, j++) {
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bool b = READ_BIT1(in, j);
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WRITE_BIT2(temp, i, b);
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}
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LogMessage("NXDN, CRC15: new:%04X old:%04X", crc[0U], temp[0U]);
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unsigned int n = length;
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for (unsigned int i = 0U; i < 15U; i++, n++) {
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bool b1 = READ_BIT2(crc, i);
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@ -128,93 +160,54 @@ void CNXDNCRC::encodeCRC15(unsigned char* in, unsigned int length)
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uint8_t CNXDNCRC::createCRC6(const unsigned char* in, unsigned int length)
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{
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uint8_t crc = 0x3EU;
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uint8_t crc = 0x3FU;
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for (unsigned int i = 0U; i < length; i++) {
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bool bit1 = READ_BIT1(in, i) != 0x00U;
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bool bit2 = (crc & 0x20U) == 0x20U;
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crc <<= 1;
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if (bit1)
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crc |= 0x01U;
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if (bit2)
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crc ^= 0x27U;
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crc &= 0x3FU;
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}
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for (unsigned int i = 0U; i < 6U; i++) {
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bool bit = (crc & 0x20U) == 0x20U;
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crc <<= 1;
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if (bit)
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if (bit1 ^ bit2)
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crc ^= 0x27U;
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}
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return (crc & 0x3FU) << 2U;
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return crc & 0x3FU;
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}
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uint16_t CNXDNCRC::createCRC12(const unsigned char* in, unsigned int length)
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{
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uint16_t crc = 0x0D9EU;
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uint16_t crc = 0x0FFFU;
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for (unsigned int i = 0U; i < length; i++) {
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bool bit1 = READ_BIT1(in, i) != 0x00U;
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bool bit2 = (crc & 0x0800U) == 0x0800U;
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crc <<= 1;
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if (bit1)
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crc |= 0x0001U;
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if (bit2)
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crc ^= 0x080FU;
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crc &= 0x0FFFU;
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}
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for (unsigned int i = 0U; i < 12U; i++) {
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bool bit = (crc & 0x0800U) == 0x0800U;
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crc <<= 1;
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if (bit)
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if (bit1 ^ bit2)
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crc ^= 0x080FU;
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}
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return (crc & 0x0FFFU) << 4U;
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return crc & 0x0FFFU;
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}
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uint16_t CNXDNCRC::createCRC15(const unsigned char* in, unsigned int length)
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{
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uint16_t crc = 0x02E4U;
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uint16_t crc = 0x7FFFU;
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for (unsigned int i = 0U; i < length; i++) {
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bool bit1 = READ_BIT1(in, i) != 0x00U;
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bool bit2 = (crc & 0x4000U) == 0x4000U;
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crc <<= 1;
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if (bit1)
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crc |= 0x0001U;
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if (bit2)
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crc ^= 0x4CC5U;
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crc &= 0x7FFFU;
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}
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for (unsigned int i = 0U; i < 15U; i++) {
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bool bit = (crc & 0x4000U) == 0x4000U;
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crc <<= 1;
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if (bit)
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if (bit1 ^ bit2)
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crc ^= 0x4CC5U;
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}
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return (crc & 0x7FFFU) << 1U;
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return crc & 0x7FFFU;
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}
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