adc10_a_ex5_battMonitor.c

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/* --COPYRIGHT--,BSD
 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
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 *    notice, this list of conditions and the following disclaimer.
 *
 * *  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.
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 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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//******************************************************************************
//******************************************************************************
#include "driverlib.h"
 
void main (void)
{
    //Stop Watchdog Timer
    WDT_A_hold(WDT_A_BASE);
 
    //Initialize the ADC10_A Module
    /*
     * Base Address for the ADC10_A Module
     * Use internal ADC10_A bit as sample/hold signal to start conversion
     * USE MODOSC 5MHZ Digital Oscillator as clock source
     * Use default clock divider of 1
     */
    ADC10_A_init(ADC10_A_BASE,
        ADC10_A_SAMPLEHOLDSOURCE_SC,
        ADC10_A_CLOCKSOURCE_ADC10OSC,
        ADC10_A_CLOCKDIVIDER_1);
 
    ADC10_A_enable(ADC10_A_BASE);
 
    /*
     * Base Address for the ADC10_A Module
     * Sample/hold for 16 clock cycles
     * Do not enable Multiple Sampling
     */
    ADC10_A_setupSamplingTimer(ADC10_A_BASE,
        ADC10_A_CYCLEHOLD_16_CYCLES,
        ADC10_A_MULTIPLESAMPLESDISABLE);
 
    //Configure Memory Buffer
    /*
     * Base Address for the ADC10_A Module
     * Use (Vcc-Vss)/2 as input
     * Use positive reference of Internally generated Vref
     * Use negative reference of AVss
     */
    ADC10_A_configureMemory(ADC10_A_BASE,
        ADC10_A_INPUT_BATTERYMONITOR,
        ADC10_A_VREFPOS_INT,
        ADC10_A_VREFNEG_AVSS);
 
    //Configure internal reference
    //If ref generator busy, WAIT
    while ( REF_BUSY == Ref_isRefGenBusy(REF_BASE) ) ;
    //Select internal ref = 1.5V
    Ref_setReferenceVoltage(REF_BASE,
        REF_VREF1_5V);
    //Internal Reference ON
    Ref_enableReferenceVoltage(REF_BASE);
 
    //Delay (~75us) for Ref to settle
    __delay_cycles(75);
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //Clear P1.0 LED off
    GPIO_setOutputLowOnPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    while (1)
    {
        //Enable and Start the conversion
        //in Single-Channel, Single-Conversion Mode
        ADC10_A_startConversion(ADC10_A_BASE,
            ADC10_A_SINGLECHANNEL);
        //ADC10BUSY?
        while (ADC10_A_isBusy(ADC10_A_BASE)) ;
 
        //For debug only
        __no_operation();
 
        //Is ADC10MEM = A11 > 1.15V?
        if (ADC10_A_getResults(ADC10_A_BASE) < 0x311){
            //Clear P1.0 LED off
            GPIO_setOutputLowOnPin(
                GPIO_PORT_P1,
                GPIO_PIN0
                );
        } else   {
            //Set P1.0 LED on
            GPIO_setOutputHighOnPin(
                GPIO_PORT_P1,
                GPIO_PIN0
                );
        }
    }
}