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Beginnings of DMR data support.

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This commit is contained in:
Jonathan Naylor
2016-01-26 18:06:31 +00:00
parent eaae483f96
commit 7bb53cf704
11 changed files with 290 additions and 33 deletions
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17
CRC.cpp
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@@ -19,6 +19,7 @@
#include "CRC.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
@@ -72,18 +73,16 @@ unsigned char CCRC::encodeEightBit(const unsigned char *in, unsigned int length)
return crc;
}
bool CCRC::checkCSBK(const unsigned char *in)
bool CCRC::checkCCITT16(const unsigned char *in, unsigned int length)
{
assert(in != NULL);
assert(length > 2U);
unsigned short crc16 = 0U;
// Run through all 12 bits
for (unsigned int a = 0; a < 12U; a++) {
for (unsigned int a = 0; a < (length - 2U); a++) {
unsigned char val = in[a];
// Allow for the CSBK CRC mask
if (a > 9U)
val ^= 0xA5U;
for (unsigned int i = 0U; i < 8U; i++) {
bool c15 = (crc16 >> 15 & 0x01U) == 0x01U;
bool bit = (val >> (7 - i) & 0x01U) == 0x01U;
@@ -93,7 +92,9 @@ bool CCRC::checkCSBK(const unsigned char *in)
}
}
return crc16 == 0x1D0FU;
LogMessage("CCITT16, %04X == %02X %02X", crc16, in[length - 2U], in[length - 1U]);
return crc16 == (in[length - 2U] << 8 | in[length - 1U]);
}
unsigned char CCRC::crc8(const unsigned char *in, unsigned int length)