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Converting my code to matlab

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Mohamed Jamal
Mohamed Jamal on 6 Aug 2020
Commented: Rena Berman on 12 Oct 2020
Hi guys, I want as one time to conver my C++ code to matlab code, I just want to do that one time and Im newbie in matlab(generally not using matlab), could anyone help me how could I implement that in matlab? thanks alot.
c++ code: (what the code is returning a specific substring that's found after syncword's substring in a give string)
using MatchVec = std::vector<Match>;
uint16_t calcCRC(std::uint8_t crcData, std::uint16_t crcReg);
int PacketIndex=0;
template <typename T, unsigned N>
constexpr unsigned countof(T const (&)[N]) noexcept
{
return N;
}
MatchVec findPattern(const std::string &str, const std::string &pattern)
{
MatchVec vec;
Match m;
std::string::size_type index, pos = 0;
while ((index = str.find(pattern, pos)) != std::string::npos) {
m.first = index; //startof Syncword
index += pattern.length();
m.second = str.substr(index,264+16); // 264 for payload size and more two byte for CRC
vec.push_back(m);
pos = index;
}
return vec;
}
uint16_t calcCRC(uint8_t crcData, uint16_t crcReg)
{
uint8_t i;
for (i = 0; i < 8; i++)
{
if (((crcReg & 0x8000) >> 8) ^ (crcData & 0x80))
{
crcReg = (crcReg << 1) ^ CRC16_POLY;
}
else
{
crcReg = (crcReg << 1);
}
crcData <<= 1;
}
return crcReg;
}
unsigned int valueOf(const std::string &substring) {
char retChar = '\0';
std::uint8_t total = 0;
int counter = 1;
for (int i=byteSize; i>0; i--) {
if (substring[i-1] == '1') total += counter;
if (substring[i-1] != ' ') counter *= 2;
}
return total;
}
void deBin(const std::string &rx) {
unsigned int ByteConvertRxBuffer[35] ={0};
uint8_t rxBuffer[countof(ByteConvertRxBuffer)];
size_t ireal=0; // notice that last two last bytes are for CRC , this means last two index here are CRC value for CRC0 , CRC1 .
uint16_t checksum; // CRC of 2byte i.e 16bits.
bool crcOK = false;
uint8_t i;
checksum = CRC_INIT;
std::cout<<"{ ";
for (size_t i=0; i<rx.length(); i+=byteSize) {
char nibble[byteSize];
for (int j=0; j<byteSize; j++) nibble[j] = rx[i+j];
std:: cout<< valueOf(nibble); // prints the value of each Byte-8bit inside each packet , dealing with each packet separately.
ByteConvertRxBuffer[ireal++]=valueOf(nibble);
if (i+byteSize != rx.length() ) std::cout<<", ";
}
std:: cout<<"}"<<endl;
for(int i=0;i<countof(ByteConvertRxBuffer);i++)
{
rxBuffer[i]=ByteConvertRxBuffer[i];
}
for(i = 0; i < sizeof(rxBuffer); i++)
{
checksum = calcCRC(rxBuffer[i], checksum);
}
PacketIndex++;
if(checksum == 0)
{
crcOK = true;
std::cout<<" your packet number "<<PacketIndex<<" :" <<"Valid"<<endl;
}
else
{
crcOK = false;
std::cout<<"your packet number "<<PacketIndex<<" :" <<"inValid"<<endl;
}
}
int main() /*int main(int argc, char** argv){}*/
{
std::string PacketData = "011101111001001010101010101010101010101010101100100110000101101010001110111100010000000000000011001010010000010111000011011001100100101110101100100101000011110110110001100110000111100110001100110000010111101111010000101101011100110011000000101101111110100010111100010100110000111111010110000101101111110011001111001011000011001001001100000001000100101101000110000010000111111110111111110";
std::string SyncWord = "10010011000010110101000111011110"; // syncword pattern
size_t notfound = PacketData.find(SyncWord);
assert(notfound != string::npos) ; //if not found as exit and don't complete.
auto matches = findPattern(PacketData, SyncWord );
for(auto &match : matches) {
std::cout << "Match found at position: " << match.first << std::endl;
std::cout << "String is " << match.second << std::endl;
deBin( match.second );
}
return 0;
}
  2 Comments
Stephen23
Stephen23 on 9 Aug 2020
Original question by Mohamed Jamal asked on 6th of August 2020 retrieved from Google Cache:
"Converting my code to matlab"
Hi guys, I want as one time to conver my C++ code to matlab code, I just want to do that one time and Im newbie in matlab(generally not using matlab), could anyone help me how could I implement that in matlab? thanks alot.
c++ code: (what the code is returning a specific substring that's found after syncword's substring in a give string)
using MatchVec = std::vector<Match>;
uint16_t calcCRC(std::uint8_t crcData, std::uint16_t crcReg);
int PacketIndex=0;
template <typename T, unsigned N>
constexpr unsigned countof(T const (&)[N]) noexcept
{
return N;
}
MatchVec findPattern(const std::string &str, const std::string &pattern)
{
MatchVec vec;
Match m;
std::string::size_type index, pos = 0;
while ((index = str.find(pattern, pos)) != std::string::npos) {
m.first = index; //startof Syncword
index += pattern.length();
m.second = str.substr(index,264+16); // 264 for payload size and more two byte for CRC
vec.push_back(m);
pos = index;
}
return vec;
}
uint16_t calcCRC(uint8_t crcData, uint16_t crcReg)
{
uint8_t i;
for (i = 0; i < 8; i++)
{
if (((crcReg & 0x8000) >> 8) ^ (crcData & 0x80))
{
crcReg = (crcReg << 1) ^ CRC16_POLY;
}
else
{
crcReg = (crcReg << 1);
}
crcData <<= 1;
}
return crcReg;
}
unsigned int valueOf(const std::string &substring) {
char retChar = '\0';
std::uint8_t total = 0;
int counter = 1;
for (int i=byteSize; i>0; i--) {
if (substring[i-1] == '1') total += counter;
if (substring[i-1] != ' ') counter *= 2;
}
return total;
}
void deBin(const std::string &rx) {
unsigned int ByteConvertRxBuffer[35] ={0};
uint8_t rxBuffer[countof(ByteConvertRxBuffer)];
size_t ireal=0; // notice that last two last bytes are for CRC , this means last two index here are CRC value for CRC0 , CRC1 .
uint16_t checksum; // CRC of 2byte i.e 16bits.
bool crcOK = false;
uint8_t i;
checksum = CRC_INIT;
std::cout<<"{ ";
for (size_t i=0; i<rx.length(); i+=byteSize) {
char nibble[byteSize];
for (int j=0; j<byteSize; j++) nibble[j] = rx[i+j];
std:: cout<< valueOf(nibble); // prints the value of each Byte-8bit inside each packet , dealing with each packet separately.
ByteConvertRxBuffer[ireal++]=valueOf(nibble);
if (i+byteSize != rx.length() ) std::cout<<", ";
}
std:: cout<<"}"<<endl;
for(int i=0;i<countof(ByteConvertRxBuffer);i++)
{
rxBuffer[i]=ByteConvertRxBuffer[i];
}
for(i = 0; i < sizeof(rxBuffer); i++)
{
checksum = calcCRC(rxBuffer[i], checksum);
}
PacketIndex++;
if(checksum == 0)
{
crcOK = true;
std::cout<<" your packet number "<<PacketIndex<<" :" <<"Valid"<<endl;
}
else
{
crcOK = false;
std::cout<<"your packet number "<<PacketIndex<<" :" <<"inValid"<<endl;
}
}
int main() /*int main(int argc, char** argv){}*/
{
std::string PacketData = "011101111001001010101010101010101010101010101100100110000101101010001110111100010000000000000011001010010000010111000011011001100100101110101100100101000011110110110001100110000111100110001100110000010111101111010000101101011100110011000000101101111110100010111100010100110000111111010110000101101111110011001111001011000011001001001100000001000100101101000110000010000111111110111111110";
std::string SyncWord = "10010011000010110101000111011110"; // syncword pattern
size_t notfound = PacketData.find(SyncWord);
assert(notfound != string::npos) ; //if not found as exit and don't complete.
auto matches = findPattern(PacketData, SyncWord );
for(auto &match : matches) {
std::cout << "Match found at position: " << match.first << std::endl;
std::cout << "String is " << match.second << std::endl;
deBin( match.second );
}
return 0;
}
Rena Berman
Rena Berman on 12 Oct 2020
(Answers Dev) Restored edit

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Answers (1)

Image Analyst
Image Analyst on 6 Aug 2020
You don't need to declare the type of a variable in advance (uint8, int, etc.)
Opening braces are not needed to start a loop and a loop ends with the "end" keyword. Replace
}
with
end
Replace
/* comment....
with
%
And for loops generally have this format:
for startingValue : stepValue : endingValue
Replace brackets by parentheses:
substring[i-1]
with
substring(i-1)
And != is ~= in MATLAB.
Other than that, just try it and handle errors as you encounter them. It's a good way to learn MATLAB syntax.
For bit shifting, check out bitshift() and a whole family of bit functions that start with "bit".
  2 Comments
Mohamed Jamal
Mohamed Jamal on 7 Aug 2020
Alright no problem, could you please give me an initial boost to convert for me just debBin function and crcCalc function to matlab and I will complete and update you with my code ofcourse? Thanks alot.
Image Analyst
Image Analyst on 9 Aug 2020
No. You deleted your original question. Why would I want to help you now, and how could I?

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