retranscrire c++ en c, au secours!

bonjour, je suis entrain de faire un projet en iut, jai recuperer un code, une bibiotheque qui gere l'i2c, mai le programme est en c++ et je n'y comprend, et j'ai à le retranscrire en c normal, aidez moi svp

voici le code:

Code:

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//Version 1.0 //Creation de la bibliotheque i2c pour nunchuck         #include <stdlib.h> #include <string.h> #include <inttypes.h> #include "twi.h"     #include "Wire.h"   // Initialize Class Variables //////////////////////////////////////////////////   uint8_t* TwoWire::rxBuffer = 0; uint8_t TwoWire::rxBufferIndex = 0; uint8_t TwoWire::rxBufferLength = 0;   uint8_t TwoWire::txAddress = 0; uint8_t* TwoWire::txBuffer = 0; uint8_t TwoWire::txBufferIndex = 0; uint8_t TwoWire::txBufferLength = 0;   uint8_t TwoWire::transmitting = 0; void (*TwoWire::user_onRequest)(void); void (*TwoWire::user_onReceive)(int);   // Constructors ////////////////////////////////////////////////////////////////   TwoWire::TwoWire() { }   // Public Methods //////////////////////////////////////////////////////////////   void TwoWire::begin(void) { // init buffer for reads rxBuffer = (uint8_t*) calloc(BUFFER_LENGTH, sizeof(uint8_t)); rxBufferIndex = 0; rxBufferLength = 0;   // init buffer for writes txBuffer = (uint8_t*) calloc(BUFFER_LENGTH, sizeof(uint8_t)); txBufferIndex = 0; txBufferLength = 0;   twi_init(); }   void TwoWire::begin(uint8_t address) { twi_setAddress(address); twi_attachSlaveTxEvent(onRequestService); twi_attachSlaveRxEvent(onReceiveService); begin(); }   void TwoWire::begin(int address) { begin((uint8_t)address); }   uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity) { // clamp to buffer length if(quantity > BUFFER_LENGTH){ quantity = BUFFER_LENGTH; } // perform blocking read into buffer uint8_t read = twi_readFrom(address, rxBuffer, quantity); // set rx buffer iterator vars rxBufferIndex = 0; rxBufferLength = read;   return read; }   uint8_t TwoWire::requestFrom(int address, int quantity) { return requestFrom((uint8_t)address, (uint8_t)quantity); }   void TwoWire::beginTransmission(uint8_t address) { // indicate that we are transmitting transmitting = 1; // set address of targeted slave txAddress = address; // reset tx buffer iterator vars txBufferIndex = 0; txBufferLength = 0; }   void TwoWire::beginTransmission(int address) { beginTransmission((uint8_t)address); }   uint8_t TwoWire::endTransmission(void) { // transmit buffer (blocking) int8_t ret = twi_writeTo(txAddress, txBuffer, txBufferLength, 1); // reset tx buffer iterator vars txBufferIndex = 0; txBufferLength = 0; // indicate that we are done transmitting transmitting = 0; return ret; }   // must be called in: // slave tx event callback // or after beginTransmission(address) void TwoWire::send(uint8_t data) { if(transmitting){ // in master transmitter mode // don't bother if buffer is full if(txBufferLength >= BUFFER_LENGTH){ return; } // put byte in tx buffer txBuffer[txBufferIndex] = data; ++txBufferIndex; // update amount in buffer txBufferLength = txBufferIndex; }else{ // in slave send mode // reply to master twi_transmit(&data, 1); } }   // must be called in: // slave tx event callback // or after beginTransmission(address) void TwoWire::send(uint8_t* data, uint8_t quantity) { if(transmitting){ // in master transmitter mode for(uint8_t i = 0; i < quantity; ++i){ send(data[i]); } }else{ // in slave send mode // reply to master twi_transmit(data, quantity); } }   // must be called in: // slave tx event callback // or after beginTransmission(address) void TwoWire::send(char* data) { send((uint8_t*)data, strlen(data)); }   // must be called in: // slave tx event callback // or after beginTransmission(address) void TwoWire::send(int data) { send((uint8_t)data); }   // must be called in: // slave rx event callback // or after requestFrom(address, numBytes) uint8_t TwoWire::available(void) { return rxBufferLength - rxBufferIndex; }   // must be called in: // slave rx event callback // or after requestFrom(address, numBytes) uint8_t TwoWire::receive(void) { // default to returning null char // for people using with char strings uint8_t value = '\0';   // get each successive byte on each call if(rxBufferIndex < rxBufferLength){ value = rxBuffer[rxBufferIndex]; ++rxBufferIndex; }   return value; }   // behind the scenes function that is called when data is received void TwoWire::onReceiveService(uint8_t* inBytes, int numBytes) { // don't bother if user hasn't registered a callback if(!user_onReceive){ return; } // don't bother if rx buffer is in use by a master requestFrom() op // i know this drops data, but it allows for slight stupidity // meaning, they may not have read all the master requestFrom() data yet if(rxBufferIndex < rxBufferLength){ return; } // copy twi rx buffer into local read buffer // this enables new reads to happen in parallel for(uint8_t i = 0; i < numBytes; ++i){ rxBuffer[i] = inBytes[i]; } // set rx iterator vars rxBufferIndex = 0; rxBufferLength = numBytes; // alert user program user_onReceive(numBytes); }   // behind the scenes function that is called when data is requested void TwoWire::onRequestService(void) { // don't bother if user hasn't registered a callback if(!user_onRequest){ return; } // reset tx buffer iterator vars // !!! this will kill any pending pre-master sendTo() activity txBufferIndex = 0; txBufferLength = 0; // alert user program user_onRequest(); }   // sets function called on slave write void TwoWire::onReceive( void (*function)(int) ) { user_onReceive = function; }   // sets function called on slave read void TwoWire::onRequest( void (*function)(void) ) { user_onRequest = function; }   // Preinstantiate Objects //////////////////////////////////////////////////////   TwoWire Wire = TwoWire();

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Bie,

Le mieux serait sans doute que tu travailles pour comprendre l'algorithme, et que tu écrives ton code ensuite. :)

Salut,

A quel niveau tu as besoin d'aide ?

je comprend rien a la derniere ligne je voudrai faire de la forme
twi_begin(...)
je comprend pas le twowire de la fin


TwoWire Wire = TwoWire();

Cette ligne déclare une variable globale de type TwoWire, et l'initialise d'une façon qui n'est pas forcément la meilleure (car il peut y avoir copie).