File content as of revision 0:db513e91a2c9:

#include "Mlx90615.h"
#include "smbus.h"

I2C i2c(p28, p27);//I2C_SDA, I2C_SCL 
void Mlx90615::wake()
{
	/*SCL = 0;
	wait_ms(50);
	SCL = 1;*/
	MLX_VCC = 1;
	wait_us(301*1000);//Waiting for valid data as datasheet says
}

unsigned int Mlx90615::sleep(){
	MLX_VCC = 0;
	return 1;
}

unsigned int Mlx90615::read(unsigned char memory, unsigned char address){
	unsigned char crc, addr, status = 0;
	unsigned int read = 0x0000;

	addr = memory + address;
	
	i2c.start();

	smbus_send_address(0x5B, WRITE);
	if(!i2c.ACK) return 0;

	smbus_send_byte(addr);
	if(!i2c.ACK) return 0;

	i2c.start();

	smbus_send_address(0x5B, READ);
	if(!i2c.ACK) return 0;

	read = smbus_read_uint(&status, LITTLE_ENDIAN);	

	crc = smbus_read_byte(&status);

	smbus_stop();

	return read;
}

unsigned int Mlx90615::read_temperature(){
	unsigned int temp = read(RAM, 0x07);
	while(temp == 0)
	{
		wait_us(5000);
		temp = read(RAM, 0x07);
	}
	return temp;
}

/*float convert_to_celsius(unsigned int temperature){
	return temperature * 0.02 - 273.15;
}*/
typedef unsigned char uint8_t;

uint8_t gencrc(uint8_t *data, size_t len)
{
    uint8_t crc = 0xff;
    size_t i, j;
    for (i = 0; i < len; i++) {
        crc ^= data[i];
        for (j = 0; j < 8; j++) {
            if ((crc & 0x80) != 0)
                crc = (uint8_t)((crc << 1) ^ 0x31);
            else
                crc <<= 1;
        }
    }
    return crc;
}

void Mlx90615::write(unsigned char address, unsigned int value){
	unsigned char addr = EEPROM + address;
	unsigned char bytes[4], crc, vh, vl;
	vh = value >> 8;
	vl = value;
	bytes[0] = 0xB6;
	bytes[1] = addr;
	bytes[2] = vl;
	bytes[3] = vh;
	crc = gencrc(bytes, 4);

	i2c.start();

	smbus_send_address(0x5B, WRITE);

	smbus_send_byte(addr);

	smbus_send_byte(vl);

	smbus_send_byte(vh);

	smbus_send_byte(crc);

	smbus_stop();
}

void Mlx90615::erase_eeprom_address(unsigned char address){
	write(address, 0x0000);
}

void Mlx90615::set_emissivity(float e){
	unsigned int emissivity;
	emissivity = 16384 * e;
	erase_eeprom_address(0x03);
	wait_us(5*1000);
	write(0x03, emissivity);
}