comp_b_ex1_2VRef.c

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//******************************************************************************
//******************************************************************************
 
#include "driverlib.h"
 
void main (void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
 
    //Select CBOUT function on P1.6/CBOUT and set P1.6 to output direction
    GPIO_setAsPeripheralModuleFunctionOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN6
        );
 
    //Initialize the Comparator B module
    /* Base Address of Comparator B,
     * Pin CB0 to Positive(+) Terminal,
     * Reference Voltage to Negative(-) Terminal,
     * Normal Power Mode,
     * Output Filter On with minimal delay,
     * Non-Inverted Output Polarity
     */
    Comp_B_initParam param = {0};
    param.positiveTerminalInput = COMP_B_INPUT0;
    param.negativeTerminalInput = COMP_B_VREF;
    param.powerModeSelect = COMP_B_POWERMODE_NORMALMODE;
    param.outputFilterEnableAndDelayLevel = COMP_B_FILTEROUTPUT_DLYLVL1;
    param.invertedOutputPolarity = COMP_B_NORMALOUTPUTPOLARITY;
    Comp_B_init(COMP_B_BASE, &param);
 
    //Set the reference voltage that is being supplied to the (-) terminal
    /* Base Address of Comparator B,
     * Reference Voltage of 2.0 V,
     * Lower Limit of 2.0*(32/32) = 2.0V,
     * Upper Limit of 2.0*(32/32) = 2.0V,
     * Static Mode Accuracy
     */
    Comp_B_configureReferenceVoltageParam refVoltageParam = {0};
    refVoltageParam.supplyVoltageReferenceBase = COMP_B_VREFBASE2_0V;
    refVoltageParam.lowerLimitSupplyVoltageFractionOf32 = 32;
    refVoltageParam.upperLimitSupplyVoltageFractionOf32 = 32;
    refVoltageParam.referenceAccuracy = COMP_B_ACCURACY_STATIC;
    Comp_B_configureReferenceVoltage(COMP_B_BASE, &refVoltageParam);
 
    //Allow power to Comparator module
    Comp_B_enable(COMP_B_BASE);
 
    //delay for the reference to settle
    __delay_cycles(75);
 
    //Enter LPM4
    __bis_SR_register(LPM4_bits);
 
    //For debug
    __no_operation();
}