main.c File Reference

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Detailed Description

Main. An example of bandgap calibration and Voltage ADC measurements.

Demonstrates bandgap calibration and VADC sampling. VADC sampling would usually be enabled with a timed period. Here we just wait until calcualtion of VADC results are finished before calculating results and starting over again. No output is implemented, so debugging have to be used for testing.

Application note:

AVR353: Voltage Reference Calibration and Voltage ADC Usage

Documentation

For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author:

Atmel Corporation: http://www.atmel.com
Support email: avr@atmel.com

Revision

4814

Date

2008-11-04 12:29:56 +0100 (ti, 04 nov 2008)

Copyright (c) 2008, Atmel Corporation All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. The name of ATMEL may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Definition in file main.c.

#include "vadc_usage.h"
#include "ATmega8HVA_16HVA_signature.h"
#include <ioavr.h>
#include <inavr.h>

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Functions
void	main (void)

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Function Documentation

void main

(

void

)

Definition at line 61 of file main.c.

References CalculateADCResults(), CALIB_HOT, CALIB_ROOM, CalibrateVREF(), InitBandgap(), InitCoeff(), StartVADCScan(), and vadc_scan_complete.

{
    uint8_t status;

    // Load coefficients needed for calcualations from the signature row.
    InitCoeff();

    /* Initialize band-gap reference to factory calibration. Calibration might
     * either have been done only at a HOT temperature, or also at room
     * temperature for complete calibration. Loading of HOT calibration _must_
     * be done before running CalibrateVREF() function.
     */
    status = InitBandgap();

    // Check if calibration was only done at HOT temperaure.
    if( status == CALIB_HOT ){
        if(CalibrateVREF()){
            // Eternal loop if calibration failed.
            do {} while (1);
        }
    }else{
        // Check if calibration was also done at room temperature.
        if(status != CALIB_ROOM){
            // Eternal loop if device was not calibrated at all.
            do {} while (1);
        }
    }

    /* Voltage ADC measurements and calculations. Results are stored in global
     * variables; \ref cell_v[NO_CELLS], adc and \ref bg_temp.
     */
    do {
        StartVADCScan();
        do{} while (!vadc_scan_complete);
        CalculateADCResults();
    } while(1);
}

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