Giving device address SRF10 - c++

Question

I have problem with program. I don't know which method or function (I have problem with name) "measurementSensor" is good. I wrote first code to give address device.
class I2CConnection{
private:
int fd;
char* fileName;
int flag;
int isOpen;
int currentAddress;
public:
I2CConnection(char *name,int flag = O_RDWR){
this->fileName = name;
this->isOpen = 0;
}
int send(char* buf[],unsigned int size){
if((write(this->fd,buf,size)) < size){
printf("Error writing to i2c slave\n");
}else{
return(size);
}
}
int recive(char* buf[],unsigned int size){
if((read(this->fd,buf,size)) <size){
printf("Error writing to i2c slave\n");
}else{
return(size);
}
}
int connectTo(int address){
if(ioctl(this->fd,I2C_SLAVE,address) < 0){
printf("Unable to get bus access to talk to slave\n");
return(0);
}else{
this->currentAddress = address;
return(1);
}
}
int openConnection(){
if((fd = open(fileName, O_RDWR)) < 0){
printf("Failed to open i2c port\n");
this->isOpen = 0;
}else{
this->isOpen = 1;
}
return(this->isOpen)
}
int closeConnection(){
if(close(fd)==0){
this->isOpen = 0;
}else{
this->isOpen = 1;
}
return(!this->isOpen);
}
~I2CConnection(){
if ( this->isOpen){
closeConnection();
}
}
}
class SonicSensor{
private:
int address;
unsigned int units;
I2CConnection* conn;
unsigned int value;
public:
SonicSensor(I2CConnection* c,int addr){
this->address = addr;
this->conn = c;
}
void changeUnits(int u){
this->units = u;
}
unsigned int measurementSensor(char* buf[]){
buf[0] = 0;
buf[1] = 0x51;
c.send(buf,2);
buf[0] = 0xA0;
c.send(buf,1);
buf[0] = 0xAA;
c.send(buf,1);
buf[0] = 0xA5;
c.send(buf,1);
buf[0] = 0xF2;
c.send(buf,1);
}
~SonicSensor(){
}
};
The problem is the error: invalid conversion from int to char*. I can't found solved for this error.

Answer 1

You should be working with arrays of bytes, not arrays of pointers-to-bytes. Unless your target platform uses 8-bit pointers, you will end up writing pointer-sized values to your I2C device instead of single bytes as intended. On a 32-bit system, for the first command instead of sending two bytes (00 and 51) you would actually send 8 bytes (00 00 00 00 and 00 00 00 51).
Your I2CConnection methods send and receive should be declared as:
int send(const char* buf, unsigned int size)
int receive(char* buf, unsigned int size)
Likewise, your SonicSensor class measurementSensor method does not appear to need an input argument, so it could be done as:
unsigned int measurementSensor() {
char buf[2];
...