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# cal_inter_rc.c

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    00001 /*This file is prepared for Doxygen automatic documentation generation.*/
    00013
    00014 /* Copyright (c) 2009 Atmel Corporation. All rights reserved.
    00015  *
    00016  * Redistribution and use in source and binary forms, with or without
    00017  * modification, are permitted provided that the following conditions are met:
    00018  *
    00019  * 1. Redistributions of source code must retain the above copyright notice,
    00020  * this list of conditions and the following disclaimer.
    00021  *
    00022  * 2. Redistributions in binary form must reproduce the above copyright notice,
    00023  * this list of conditions and the following disclaimer in the documentation
    00024  * and/or other materials provided with the distribution.
    00025  *
    00026  * 3. The name of Atmel may not be used to endorse or promote products derived
    00027  * from this software without specific prior written permission.
    00028  *
    00029  * 4. This software may only be redistributed and used in connection with an Atmel
    00030  * AVR product.
    00031  *
    00032  * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
    00033  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    00034  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE EXPRESSLY AND
    00035  * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
    00036  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    00037  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    00038  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    00039  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    00040  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    00041  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00042  */
    00043
    00044 //_____  I N C L U D E S ___________________________________________________
    00045
    00046 #include "config.h"
    00047 #include "cal_inter_rc.h"
    00048 #include "lib_mcu/temp_sensor/temp_sensor.h"
    00049 #include "lib_mcu/flash/flash_drv.h"
    00050 #include "lib_mcu/adc/adc_drv.h"
    00051
    00052 //_____ M A C R O S ________________________________________________________
    00053
    00054
    00055 //_____ P R I V A T E    D E C L A R A T I O N _____________________________
    00056
    00057
    00058 //_____ D E F I N I T I O N ________________________________________________
    00059
    00060
    00061 //_____ D E C L A R A T I O N ______________________________________________
    00062
    00063 U8 osc_cal_25_3v;
    00064 U8 osc_cal_85_3v;
    00065 U8 osc_cal_25_5v;
    00066 U8 offset;
    00067 U16 temp_sensor_25;
    00068 U16 temp_sensor_85;
    00069 U8 n_step;
    00070 U8 period;
    00071 U16 temp_value;
    00072
    00077 void get_cal_values(void)
    00078 {
    00079   U8 temp_sensor_25_lo;
    00080   U8 temp_sensor_25_hi;
    00081   U8 temp_sensor_85_lo;
    00082   U8 temp_sensor_85_hi;
    00083   osc_cal_25_3v = flash_read_sig(0x01);
    00084   osc_cal_85_3v = flash_read_sig(0x03);
    00085   osc_cal_25_5v = flash_read_sig(0x05);
    00086   temp_sensor_25_lo = flash_read_sig(0x38);
    00087   temp_sensor_25_hi = flash_read_sig(0x39);
    00088   temp_sensor_85_lo = flash_read_sig(0x3A);
    00089   temp_sensor_85_hi = flash_read_sig(0x3B);
    00090   temp_sensor_25 = (temp_sensor_25_hi << 8) + temp_sensor_25_lo;
    00091   temp_sensor_85 = (temp_sensor_85_hi << 8) + temp_sensor_85_lo;
    00092   offset = (osc_cal_25_5v) - (osc_cal_25_3v);
    00093   n_step = osc_cal_25_3v - osc_cal_85_3v;
    00094   period = (temp_sensor_85 - temp_sensor_25)/n_step;
    00095 }
    00096
    00101 void calibrate_inter_osc(enum vcc v)
    00102 {
    00103   U8 osc_cal;
    00104   get_cal_values();
    00105   osc_cal = osc_cal_25_3v;
    00106   temp_value = get_temp_sensor_val();
    00107
    00108    if(temp_value < temp_sensor_25)
    00109    {
    00110      for (U16 t = temp_sensor_25; t>0; t-=period)
    00111         {
    00112           osc_cal++;
    00113           if(t<temp_value)
    00114             break;
    00115         }
    00116    }
    00117      else if(temp_value >= temp_sensor_85)
    00118      osc_cal = osc_cal_85_3v;
    00119       else if(temp_value > temp_sensor_25)
    00120       { for (U16 t = temp_sensor_25; t<temp_sensor_85; t+=(2*period))
    00121         {
    00122           osc_cal--;
    00123           if(t>temp_value)
    00124             break;
    00125         }
    00126       }
    00127   if(vcc_3)
    00128   {
    00129    OSCCAL = osc_cal;
    00130   }
    00131  else OSCCAL = osc_cal + offset;
    00132
    00133 }
    00134
    00135
    00136
    00137
    00138
    00139