cal_inter_rc.c

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//_____  I N C L U D E S ___________________________________________________

#include "config.h"
#include "cal_inter_rc.h"
#include "lib_mcu/temp_sensor/temp_sensor.h"
#include "lib_mcu/flash/flash_drv.h"
#include "lib_mcu/adc/adc_drv.h"

//_____ M A C R O S ________________________________________________________


//_____ P R I V A T E    D E C L A R A T I O N _____________________________


//_____ D E F I N I T I O N ________________________________________________


//_____ D E C L A R A T I O N ______________________________________________

U8 osc_cal_25_3v;
U8 osc_cal_85_3v;
U8 osc_cal_25_5v;
U8 offset;
U16 temp_sensor_25;
U16 temp_sensor_85;
U8 n_step;
U8 period;
U16 temp_value;

void get_cal_values(void)
{
  U8 temp_sensor_25_lo;
  U8 temp_sensor_25_hi;
  U8 temp_sensor_85_lo;
  U8 temp_sensor_85_hi;
  osc_cal_25_3v = flash_read_sig(0x01);
  osc_cal_85_3v = flash_read_sig(0x03);
  osc_cal_25_5v = flash_read_sig(0x05);
  temp_sensor_25_lo = flash_read_sig(0x38);
  temp_sensor_25_hi = flash_read_sig(0x39);
  temp_sensor_85_lo = flash_read_sig(0x3A);
  temp_sensor_85_hi = flash_read_sig(0x3B);
  temp_sensor_25 = (temp_sensor_25_hi << 8) + temp_sensor_25_lo;
  temp_sensor_85 = (temp_sensor_85_hi << 8) + temp_sensor_85_lo;
  offset = (osc_cal_25_5v) - (osc_cal_25_3v);
  n_step = osc_cal_25_3v - osc_cal_85_3v;
  period = (temp_sensor_85 - temp_sensor_25)/n_step;
}

void calibrate_inter_osc(enum vcc v)
{
  U8 osc_cal;
  get_cal_values();
  osc_cal = osc_cal_25_3v;
  temp_value = get_temp_sensor_val();

   if(temp_value < temp_sensor_25)
   {
     for (U16 t = temp_sensor_25; t>0; t-=period)
        {
          osc_cal++;
          if(t<temp_value)
            break;
        }
   }
     else if(temp_value >= temp_sensor_85)
     osc_cal = osc_cal_85_3v;
      else if(temp_value > temp_sensor_25)
      { for (U16 t = temp_sensor_25; t<temp_sensor_85; t+=(2*period))
        {
          osc_cal--;
          if(t>temp_value)
            break;
        }
      }
  if(vcc_3)
  {
   OSCCAL = osc_cal;
  }
 else OSCCAL = osc_cal + offset;

}