char e_i2cp_read_string(char device_add, char *read_buffer, char start_address, char string_length)
{
char error=0;
error=1;
error&=e_i2c_start();
error&=e_i2c_write(device_add); // Device address
error&=e_i2c_write(start_address); // 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)
while (string_length) {
error&=e_i2c_read(read_buffer); // read a single byte
read_buffer++;
string_length--;
if(string_length == 0) { /* If last char, generate NACK sequence */
error&=e_i2c_nack(); // the last byte to be read, must send nack
} else { /* For other chars,generate ACK sequence */
error&=e_i2c_ack();
}
while(I2C1CONbits.ACKEN == 1); /* Wait till ACK/NACK sequence is over */
}
e_i2c_stop(); // End read cycle
return error;
}
/*!\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;
}