/*!\brief Continuous read (multiple register reading).
* \param device_add The device address
* \param read_buffer the buffer that will contain the values read from the registers
* \param reg The register start address
* \return 1 to confirme the oparation and 0 for an error
*/
char readRegMulti(char device_add, unsigned char *read_buffer, char start_address, unsigned char numBytes) {
char error = 0;
unsigned int i = 0;
while (!error) {
error = 1;
error &= e_i2c_start();
error &= e_i2c_write(device_add); // Device address
error &= e_i2c_write(start_address | 0x80); // address of first register to be read
error &= e_i2c_restart();
error &= e_i2c_write(device_add + 1); // To change data direction ([bit 0]=1)
for (i = 0; i < numBytes; i++) {
error &= e_i2c_read(&read_buffer[i]); // read the next byte
if (i == (numBytes - 1)) { // the last byte to be read, must send nack
error &= e_i2c_nack();
} else {
error &= e_i2c_ack(); // not the last byte, send ack
}
}
e_i2c_stop(); // End read cycle
if (error)
break;
e_i2c_reset();
}
return error;
}
// Write 1 byte to register reg of devantec sensor
void e_i2cd_write (char device_add, char reg, char value)
{
e_i2c_start();
e_i2c_write(device_add); // Writing the device (slave) address
e_i2c_write(reg); // Device register address
e_i2c_write(value); // Data to device
e_i2c_stop(); // Ending the communication
e_i2c_reset();
}
//read 1 byte from the register reg of devantec sensor
char e_i2cd_readb(char device_add, char reg)
{
char value;
e_i2c_start(); // start
e_i2c_write(device_add); // Device address
e_i2c_write(reg); // Register address
e_i2c_restart(); // 2nd start
e_i2c_write(device_add+1); // Device address
e_i2c_read(&value); // read single byte
e_i2c_nack(); // only 1 byte is being read, so send nack
e_i2c_stop(); // end read cycle
e_i2c_reset();
return value;
}
/*! \brief Write a specific register on a device
* \param device_add The address of the device you want information
* \param reg The register address you want read on the device
* \param value The data you want to write
* \return 1 to confirme the oparation and 0 for an error
*/
char e_i2cp_write (char device_add, char reg, char value)
{
char error=0;
while(!error)
{
error=1;
error&=e_i2c_start();
error&=e_i2c_write(device_add); // Writing the device (slave) address
error&=e_i2c_write(reg); // Device register address
error&=e_i2c_write(value); // Data to device
error&=e_i2c_stop(); // Ending the communication
if(error)
break;
e_i2c_reset();
}
return error;
}
char e_i2cp_write (char device_add,char reg, char value)
{
char error=0; // Initialize to no error
while(!error) { // While they are still some errors...
error=1; // We initilize the error to 1
error&=e_i2c_start(); // We intiate a start and...
error&=e_i2c_write(device_add); // ... write the I2C MODULE ADDRESS we want to write
error&=e_i2c_write(reg); // ... and the REGISTER ADDRESS we want to write
error&=e_i2c_write(value); // ... and send the value we want to write
error&=e_i2c_stop(); // ... the tranfer is then terminated by a stop
if(error) {
break;
}
e_i2c_reset();
}
return error;
}
char e_i2cp_read(char device_add,char reg)
{
char error=0; // Initialize to no error
char value; // Value that will be returned
while(!error) { // While they are still some errors...
error=1; // We initilize the error to 1
error&=e_i2c_start(); // We intiate a start and...
error&=e_i2c_write(device_add); // ... write the I2C MODULE ADDRESS we want to read
error&=e_i2c_write(reg); // ... and the REGISTER ADDRESS we want to read
error&=e_i2c_restart(); // ... In order to indicate to the slave that he can send the data, we iniate a restart
error&=e_i2c_write(device_add+1); // ... and rewrite the MODULE ADDRESS with change of data direction ([bit 0]=1)
error&=e_i2c_read(&value); // ... and read the data sent by the slave (the I2C Module)
e_i2c_nack(); // ... only 1 byte is being read, so send nack
e_i2c_stop(); // ... the tranfer is then terminated by a stop
if(error) {
break;
}
e_i2c_reset();
}
return value;
}
/*! \brief Read a specific register on a device
* \param device_add The address of the device you want information
* \param reg The register address you want read on the device
* \return The readed value
*/
char e_i2cp_read(char device_add, char reg)
{
char error=0;
char value;
while(!error)
{
error=1;
error&=e_i2c_start();
error&=e_i2c_write(device_add); // Device address
error&=e_i2c_write(reg); // Register address
error&=e_i2c_restart();
error&=e_i2c_write(device_add+1); // To change data direction ([bit 0]=1)
error&=e_i2c_read(&value); // read single byte
e_i2c_nack(); // only 1 byte is being read, so send nack
e_i2c_stop(); // end read cycle
if(error)
break;
e_i2c_reset();
}
return value;
}
