ref_ex1_ADC12Ctl.c

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#include "driverlib.h"
 
//******************************************************************************
//******************************************************************************
 
void main (void)
{
    volatile uint16_t i;
 
    //Stop watchdog timer
    WDT_A_hold(WDT_A_BASE);
 
    //Enable A/D channel A0
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P6,
        GPIO_PIN0
        );
 
 
    //By default, REFMSTR=1 => REFCTL is used to configure the internal reference
 
    //If ref generator busy, WAIT
    while (Ref_isRefGenBusy(REF_BASE)) ;
    //Select internal ref = 2.5V
    Ref_setReferenceVoltage(REF_BASE,
        REF_VREF2_5V);
    //Internal Reference ON
    Ref_enableReferenceVoltage(REF_BASE);
 
    //Delay (~75us) for Ref to settle
    __delay_cycles(75);
 
    //Initialize the ADC12 Module
    /*
     * Base address of ADC12 Module
     * Use internal ADC12 bit as sample/hold signal to start conversion
     * USE MODOSC 5MHZ Digital Oscillator as clock source
     * Use default clock divider of 1
     */
    ADC12_A_init(ADC12_A_BASE,
        ADC12_A_SAMPLEHOLDSOURCE_SC,
        ADC12_A_CLOCKSOURCE_ADC12OSC,
        ADC12_A_CLOCKDIVIDER_1);
 
    ADC12_A_enable(ADC12_A_BASE);
 
    /*
     * Base address of ADC12 Module
     * For memory buffers 0-7 sample/hold for 64 clock cycles
     * For memory buffers 8-15 sample/hold for 4 clock cycles (default)
     * Disable Multiple Sampling
     */
    ADC12_A_setupSamplingTimer(ADC12_A_BASE,
        ADC12_A_CYCLEHOLD_64_CYCLES,
        ADC12_A_CYCLEHOLD_4_CYCLES,
        ADC12_A_MULTIPLESAMPLESENABLE);
 
    //Configure Memory Buffer
    /*
     * Base address of the ADC12 Module
     * Configure memory buffer 0
     * Map input A0 to memory buffer 0
     * Vref+ = Vref+ (INT)
     * Vref- = AVss
     */
    ADC12_A_configureMemoryParam configureMemoryParam = {0};
    configureMemoryParam.memoryBufferControlIndex = ADC12_A_MEMORY_0;
    configureMemoryParam.inputSourceSelect = ADC12_A_INPUT_A0;
    configureMemoryParam.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_INT;
    configureMemoryParam.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
    configureMemoryParam.endOfSequence = ADC12_A_NOTENDOFSEQUENCE;
    ADC12_A_configureMemory(ADC12_A_BASE ,&configureMemoryParam);
    
 
    while (1)
    {
        //Enable/Start sampling and conversion
        /*
         * Base address of ADC12 Module
         * Start the conversion into memory buffer 0
         * Use the single-channel, single-conversion mode
         */
        ADC12_A_startConversion(ADC12_A_BASE,
            ADC12_A_MEMORY_0,
            ADC12_A_SINGLECHANNEL);
 
        //Poll for interrupt on memory buffer 0
        while (ADC12IFG0 != ADC12_A_getInterruptStatus(ADC12_A_BASE,
                   ADC12IFG0)) ;
 
        //SET BREAKPOINT HERE
        __no_operation();
    }
}