comp_d_ex1_outputToggleVcompVsVref2V.c

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//******************************************************************************
// MSP430FR57xx Demo - COMPD Toggle from LPM4; input channel CD13;
//      Vcompare is compared against the internal reference 2.0V
//
// Description: Use CompD (input channel CD13) and internal reference to
//    determine if input'Vcompare'is high or low.  When Vcompare exceeds 2.0V
//    CDOUT goes high and when Vcompare is less than 2.0V then CDOUT goes low.
//    P3.5/CDOUT is connected internally to an LED; it will toggle accordingly.
//
//                 MSP430FR5739
//             ------------------
//         /|\|                  |
//          | |                  |
//          --|RST       P1.2/CD2|<--Vcompare
//            |                  |
//            |        P3.5/CDOUT|----> 'high'(Vcompare>2.0V); 'low'(Vcompare<2.0V)
//            |                  |  |
//            |                  |  | LED 'ON'(Vcompare>2.0V); 'OFF'(Vcompare<2.0V)
//            |                  |
//
//******************************************************************************
#include "driverlib.h"
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Set P3.5 as Ternary Module Function Output.
    /*
 
    * Select Port 3
    * Set Pin 5 to output Ternary Module Function, (CBOUT).
    */
    GPIO_setAsPeripheralModuleFunctionOutputPin(
        GPIO_PORT_P3,
        GPIO_PIN5,
        GPIO_TERNARY_MODULE_FUNCTION
    );
 
    //Initialize the Comparator D module
    /* Base Address of Comparator D,
    * Pin CD2 to Positive(+) Terminal,
    * Reference Voltage to Negative(-) Terminal,
    * Normal Power Mode,
    * Output Filter On with minimal delay,
    * Non-Inverted Output Polarity
    */
          
    Comp_D_initParam param = {0};
    param.positiveTerminalInput = COMP_D_INPUT2;
    param.negativeTerminalInput = COMP_D_VREF;
    param.outputFilterEnableAndDelayLevel = COMP_D_FILTEROUTPUT_OFF;
    param.invertedOutputPolarity = COMP_D_NORMALOUTPUTPOLARITY;
    Comp_D_init(COMP_D_BASE, &param);
 
  //Set the reference voltage that is being supplied to the (-) terminal
  /* Base Address of Comparator D,
   * Reference Voltage of 2.0 V,
   * Lower Limit of 2.0*(32/32) = 2.0V,
   * Upper Limit of 2.0*(32/32) = 2.0V
   */
    Comp_D_setReferenceVoltage(COMP_D_BASE,
      COMP_D_VREFBASE2_0V,
      32,
      32
      );
 
    //Disable Input Buffer on P1.2/CD2
    /* Base Address of Comparator D,
     * Input Buffer port
     * Selecting the CDx input pin to the comparator
     * multiplexer with the CDx bits automatically
     * disables output driver and input buffer for
     * that pin, regardless of the state of the
     * associated CDPD.x bit
     */
      Comp_D_disableInputBuffer(COMP_D_BASE,
          COMP_D_INPUT2);
 
  //Allow power to Comparator module
  Comp_D_enable(COMP_D_BASE);
 
  __delay_cycles(400);           // delay for the reference to settle
 
  __bis_SR_register(LPM4_bits);          // Enter LPM4
  __no_operation();                      // For debug
}