char t32_buff[25];
const uint8_t str1[] = "Lux = ";
//const uint8_t str2[] = " ";
const uint8_t str3[] = "\r\n";
const uint8_t str4[] = "Out of range!!!";
  
int main(void){
  /* local variables */
  uint8_t mant = 0, exponent = 0;
  float lux = 0.0;  
  
  /* mandatory system initializations */
  vpc_system_init();
  //vpc_rtc_init(); /* enable if required */  
  vpc_gpio_init();
  vpc_usart2_uart_init(); /* enable if required */ 
  vpc_i2c1_init();
  /* third-party initializations */
  
  /* do your own initializations below */
  max44009_setup_auto_noint(0); // auto, cycle at 800ms
  
  while(1){
    /* your forever repeating code */
    uart_putstrF(USART2, str1);
    _max44009_reg0 = 0;
    _max44009_reg1 = 0;
    max44009_read_2regs(MAX44009_REG_HIGH_BYTE);
    exponent = (_max44009_reg0 & 0xf0) >> 4;
    if (exponent < 15) {
      mant = (_max44009_reg0 & 0x0f) << 4 | _max44009_reg1;
      //lux = (float)(((0x00000001 << exponent) * (float)mant) * 0.045);
      lux = (float) ((pow(2, (float) exponent) * (float) mant) * 0.045);
      sprintf(t32_buff, "%10.3f", lux);
      //double2dec((uint32_t)lux, (uint8_t *)t32_buff);
      uart_putstr(USART2, (uint8_t *) t32_buff); // light the green led
    } else {
      uart_putstrF(USART2, str4); // out of range error! - light the red led
      lux = 0.0;
    }
    uart_putstrF(USART2, str3);
    my_delay_ms(1000);
    GPIO_ToggleBits(LD2_GPIO_Port, LD2_Pin);
    
  }
  return 0;
}