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Ulrich Mohr
2020-04-02 18:32:37 +02:00
commit 93a02c8db2
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#include "DleEncoder.h"
DleEncoder::DleEncoder() {
}
DleEncoder::~DleEncoder() {
}
ReturnValue_t DleEncoder::decode(const uint8_t *sourceStream,
size_t sourceStreamLen, size_t *readLen, uint8_t *destStream,
size_t maxDestStreamlen, size_t *decodedLen) {
size_t encodedIndex = 0, decodedIndex = 0;
uint8_t nextByte;
if (*sourceStream != STX) {
return RETURN_FAILED;
}
++encodedIndex;
while ((encodedIndex < sourceStreamLen) && (decodedIndex < maxDestStreamlen)
&& (sourceStream[encodedIndex] != ETX)
&& (sourceStream[encodedIndex] != STX)) {
if (sourceStream[encodedIndex] == DLE) {
nextByte = sourceStream[encodedIndex + 1];
if (nextByte == 0x10) {
destStream[decodedIndex] = nextByte;
} else {
if ((nextByte == 0x42) || (nextByte == 0x43)
|| (nextByte == 0x4D)) {
destStream[decodedIndex] = nextByte - 0x40;
} else {
return RETURN_FAILED;
}
}
++encodedIndex;
} else {
destStream[decodedIndex] = sourceStream[encodedIndex];
}
++encodedIndex;
++decodedIndex;
}
if (sourceStream[encodedIndex] != ETX) {
return RETURN_FAILED;
} else {
*readLen = ++encodedIndex;
*decodedLen = decodedIndex;
return RETURN_OK;
}
}
ReturnValue_t DleEncoder::encode(const uint8_t* sourceStream,
size_t sourceLen, uint8_t* destStream, size_t maxDestLen,
size_t* encodedLen, bool addStxEtx) {
if (maxDestLen < 2) {
return RETURN_FAILED;
}
uint32_t encodedIndex = 0, sourceIndex = 0;
uint8_t nextByte;
if (addStxEtx) {
destStream[0] = STX;
++encodedIndex;
}
while ((encodedIndex < maxDestLen) && (sourceIndex < sourceLen)) {
nextByte = sourceStream[sourceIndex];
if ((nextByte == STX) || (nextByte == ETX) || (nextByte == 0x0D)) {
if (encodedIndex + 1 >= maxDestLen) {
return RETURN_FAILED;
} else {
destStream[encodedIndex] = DLE;
++encodedIndex;
destStream[encodedIndex] = nextByte + 0x40;
}
} else if (nextByte == DLE) {
if (encodedIndex + 1 >= maxDestLen) {
return RETURN_FAILED;
} else {
destStream[encodedIndex] = DLE;
++encodedIndex;
destStream[encodedIndex] = DLE;
}
} else {
destStream[encodedIndex] = nextByte;
}
++encodedIndex;
++sourceIndex;
}
if ((sourceIndex == sourceLen) && (encodedIndex < maxDestLen)) {
if (addStxEtx) {
destStream[encodedIndex] = ETX;
++encodedIndex;
}
*encodedLen = encodedIndex;
return RETURN_OK;
} else {
return RETURN_FAILED;
}
}

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#ifndef DLEENCODER_H_
#define DLEENCODER_H_
#include "HasReturnvaluesIF.h"
#include <stdlib.h>
class DleEncoder: public HasReturnvaluesIF {
private:
DleEncoder();
virtual ~DleEncoder();
public:
static const uint8_t STX = 0x02;
static const uint8_t ETX = 0x03;
static const uint8_t DLE = 0x10;
static ReturnValue_t decode(const uint8_t *sourceStream,
size_t sourceStreamLen, size_t *readLen, uint8_t *destStream,
size_t maxDestStreamlen, size_t *decodedLen);
static ReturnValue_t encode(const uint8_t *sourceStream, size_t sourceLen,
uint8_t *destStream, size_t maxDestLen, size_t *encodedLen,
bool addStxEtx = true);
};
#endif /* DLEENCODER_H_ */

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#ifndef HASRETURNVALUESIF_H_
#define HASRETURNVALUESIF_H_
#include <stdint.h>
#define MAKE_RETURN_CODE( number ) ((INTERFACE_ID << 8) + (number))
typedef uint16_t ReturnValue_t;
class HasReturnvaluesIF {
public:
static const ReturnValue_t RETURN_OK = 0;
static const ReturnValue_t RETURN_FAILED = 1;
virtual ~HasReturnvaluesIF() {
}
};
#endif /* HASRETURNVALUESIF_H_ */

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5. Submission of Contributions. Unless You explicitly state otherwise,
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6. Trademarks. This License does not grant permission to use the trade
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24
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The classes in this folder are taken from the Flight Software Framework, hosted at
https://egit.irs.uni-stuttgart.de/fsfw/fsfw. Original NOTICE file below:
Flight Software Framework
The initial version of the Flight Software Framework was developed during
the Flying Laptop Project by the Universität Stuttgart in coorporation
with Airbus Defence and Space GmbH.
Copyrights in the Flight Software Framework are retained by their contributors.
No copyright assignment is required to contribute to the Flight Software Framework.
Some files include explicit copyright notices and/or license notices.
For full authorship information, see the version control history.
Except as otherwise noted (below and/or in individual files), the
Flight Software Framework is licensed under the Apache License, Version 2.0.
The Flight Software Framework includes modules written by third parties.
The following third party modules are included, and carry
their own copyright notices and license terms:
under contrib/:
* sgp4: sgp4 code developed by david vallado under public domain, see https://www.celestrak.com/publications/AIAA/2006-6753/

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#ifndef FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_
#define FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_
#include "HasReturnvaluesIF.h"
#include <stdlib.h>
template<uint8_t N_READ_PTRS = 1>
class RingBufferBase {
public:
RingBufferBase(size_t startAddress, size_t size, bool overwriteOld) :
start(startAddress), write(startAddress), size(size), overwriteOld(overwriteOld) {
for (uint8_t count = 0; count < N_READ_PTRS; count++) {
read[count] = startAddress;
}
}
ReturnValue_t readData(size_t amount, uint8_t n = 0) {
if (availableReadData(n) >= amount) {
incrementRead(amount, n);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
ReturnValue_t writeData(size_t amount) {
if (availableWriteSpace() >= amount || overwriteOld) {
incrementWrite(amount);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
size_t availableReadData(uint8_t n = 0) const {
return ((write + size) - read[n]) % size;
}
size_t availableWriteSpace(uint8_t n = 0) const {
//One less to avoid ambiguous full/empty problem.
return (((read[n] + size) - write - 1) % size);
}
bool isFull(uint8_t n = 0) {
return (availableWriteSpace(n) == 0);
}
bool isEmpty(uint8_t n = 0) {
return (availableReadData(n) == 0);
}
virtual ~RingBufferBase() {
}
size_t getRead(uint8_t n = 0) const {
return read[n];
}
void setRead(size_t read, uint8_t n = 0) {
if (read >= start && read < (start+size)) {
this->read[n] = read;
}
}
size_t getWrite() const {
return write;
}
void setWrite(size_t write) {
this->write = write;
}
void clear() {
write = start;
for (uint8_t count = 0; count < N_READ_PTRS; count++) {
read[count] = start;
}
}
size_t writeTillWrap() {
return (start + size) - write;
}
size_t readTillWrap(uint8_t n = 0) {
return (start + size) - read[n];
}
size_t getStart() const {
return start;
}
bool overwritesOld() const {
return overwriteOld;
}
size_t maxSize() const {
return size - 1;
}
protected:
const size_t start;
size_t write;
size_t read[N_READ_PTRS];
const size_t size;
const bool overwriteOld;
void incrementWrite(size_t amount) {
write = ((write + amount - start) % size) + start;
}
void incrementRead(size_t amount, uint8_t n = 0) {
read[n] = ((read[n] + amount - start) % size) + start;
}
};
#endif /* FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_ */

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#include "SimpleRingBuffer.h"
#include <string.h>
SimpleRingBuffer::SimpleRingBuffer(size_t size, bool overwriteOld) :
RingBufferBase<>(0, size, overwriteOld), buffer(NULL) {
buffer = new uint8_t[size];
}
SimpleRingBuffer::~SimpleRingBuffer() {
delete[] buffer;
}
ReturnValue_t SimpleRingBuffer::writeData(const uint8_t* data,
size_t amount) {
if (availableWriteSpace() >= amount || overwriteOld) {
size_t amountTillWrap = writeTillWrap();
if (amountTillWrap >= amount) {
memcpy(&buffer[write], data, amount);
} else {
memcpy(&buffer[write], data, amountTillWrap);
memcpy(buffer, data + amountTillWrap, amount - amountTillWrap);
}
incrementWrite(amount);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
ReturnValue_t SimpleRingBuffer::readData(uint8_t* data, size_t amount,
bool readRemaining, size_t* trueAmount) {
size_t availableData = availableReadData(READ_PTR);
size_t amountTillWrap = readTillWrap(READ_PTR);
if (availableData < amount) {
if (readRemaining) {
amount = availableData;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
if (trueAmount != NULL) {
*trueAmount = amount;
}
if (amountTillWrap >= amount) {
memcpy(data, &buffer[read[READ_PTR]], amount);
} else {
memcpy(data, &buffer[read[READ_PTR]], amountTillWrap);
memcpy(data + amountTillWrap, buffer, amount - amountTillWrap);
}
return HasReturnvaluesIF::RETURN_OK;
}
ReturnValue_t SimpleRingBuffer::deleteData(size_t amount,
bool deleteRemaining, size_t* trueAmount) {
size_t availableData = availableReadData(READ_PTR);
if (availableData < amount) {
if (deleteRemaining) {
amount = availableData;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
if (trueAmount != NULL) {
*trueAmount = amount;
}
incrementRead(amount, READ_PTR);
return HasReturnvaluesIF::RETURN_OK;
}

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#ifndef FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_
#define FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_
#include "RingBufferBase.h"
#include <stddef.h>
class SimpleRingBuffer: public RingBufferBase<> {
public:
SimpleRingBuffer(size_t size, bool overwriteOld);
virtual ~SimpleRingBuffer();
ReturnValue_t writeData(const uint8_t* data, size_t amount);
ReturnValue_t readData(uint8_t* data, size_t amount, bool readRemaining = false, size_t* trueAmount = NULL);
ReturnValue_t deleteData(size_t amount, bool deleteRemaining = false, size_t* trueAmount = NULL);
private:
// static const uint8_t TEMP_READ_PTR = 1;
static const uint8_t READ_PTR = 0;
uint8_t* buffer;
};
#endif /* FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_ */

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#include "crc_ccitt.h"
#include <math.h>
static const uint16_t crc_table[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
// CRC implementation
uint16_t Calculate_CRC(uint8_t const input[], uint32_t length)
{
uint16_t crc = 0xFFFF;
uint8_t *data = (uint8_t *)input;
unsigned int tbl_idx;
while (length--) {
tbl_idx = ((crc >> 8) ^ *data) & 0xff;
crc = (crc_table[tbl_idx] ^ (crc << 8)) & 0xffff;
data++;
}
return crc & 0xffff;
//The part below is not used!
// bool temr[16];
// bool xor_out[16];
// bool r[16];
// bool d[8];
// uint16_t crc_value = 0;
//
//
// for (int i=0; i<16 ;i++) {
// temr[i] = false;
// xor_out[i] = false;
// }
//
//
// for (int i=0; i<16 ;i++)
// r[i] = true; // initialize with 0xFFFF
//
//
//
// for (int j=0; j<length ;j++)
// {
//
// for (int i=0; i<8 ;i++)
// if ((input[j] & 1<<i) == 1<<i)
// d[7-i]=true; // reverse input data
// else
// d[7-i]=false; // reverse input data
//
//
//
// temr[0] = d[4] ^ d[0];
// temr[1] = d[5] ^ d[1];
// temr[2] = d[6] ^ d[2];
// temr[3] = d[7] ^ d[3];
// temr[4] = r[12] ^ r[8];
// temr[5] = r[13] ^ r[9];
// temr[6] = r[14] ^ r[10];
// temr[7] = r[15] ^ r[11];
// temr[8] = d[4] ^ r[12];
// temr[9] = d[5] ^ r[13];
// temr[10] = d[6] ^ r[14];
// temr[11] = d[7] ^ r[15];
// temr[12] = temr[0] ^ temr[4];
// temr[13] = temr[1] ^ temr[5];
// temr[14] = temr[2] ^ temr[6];
// temr[15] = temr[3] ^ temr[7];
//
//
// xor_out[0] = temr[12];
// xor_out[1] = temr[13];
// xor_out[2] = temr[14];
// xor_out[3] = temr[15];
// xor_out[4] = temr[8];
// xor_out[5] = temr[9] ^ temr[12];
// xor_out[6] = temr[10] ^ temr[13];
// xor_out[7] = temr[11] ^ temr[14];
// xor_out[8] = temr[15] ^ r[0];
// xor_out[9] = temr[8] ^ r[1];
// xor_out[10] = temr[9] ^ r[2];
// xor_out[11] = temr[10] ^ r[3];
// xor_out[12] = temr[11] ^ temr[12] ^ r[4];
// xor_out[13] = temr[13] ^ r[5];
// xor_out[14] = temr[14] ^ r[6];
// xor_out[15] = temr[15] ^ r[7];
//
// for (int i=0; i<16 ;i++)
// {
// r[i]= xor_out[i] ;
// }
//
// }
//
//
//
// for (int i=0; i<16 ;i++)
// {
// if (xor_out[i] == true)
// crc_value = crc_value + pow(2,(15 -i)); // reverse CrC result before Final XOR
// }
//
// crc_value = 0;// for debug mode
// return (crc_value);
} /* Calculate_CRC() */

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helper/crc_ccitt.h Normal file
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#ifndef CRC_CCITT_H_
#define CRC_CCITT_H_
#include <stdint.h>
uint16_t Calculate_CRC(uint8_t const input[], uint32_t length);
#endif /* CRC_H_ */