adc10_a_ex4_signedData.c

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 * Copyright (c) 2017, Texas Instruments Incorporated
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 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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//******************************************************************************
//******************************************************************************
 
#include "driverlib.h"
 
void main (void)
{
    //Stop Watchdog Timer
    WDT_A_hold(WDT_A_BASE);
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //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);
    //Convert data into signed, 2's complement format
    ADC10_A_setDataReadBackFormat(ADC10_A_BASE,
        ADC10_A_SIGNED_2SCOMPLEMENT);
 
    //Configure Memory Buffer
    /*
     * Base Address for the ADC10_A Module
     * Use input A1
     * Use positive reference of AVcc
     * Use negative reference of AVss
     */
    ADC10_A_configureMemory(ADC10_A_BASE,
        ADC10_A_INPUT_A1,
        ADC10_A_VREFPOS_AVCC,
        ADC10_A_VREFNEG_AVSS);
 
    //Enable Memory Buffer Interrupt
    ADC10_A_clearInterrupt(ADC10_A_BASE,
        ADC10IFG0);
    ADC10_A_enableInterrupt(ADC10_A_BASE,
        ADC10IE0);
 
    while (1)
    {
        __delay_cycles(5000);
 
        //Enable and Start the conversion
        //in Single-Channel, Single-Conversion Mode
        ADC10_A_startConversion(ADC10_A_BASE,
            ADC10_A_SINGLECHANNEL);
 
        //LPM0, ADC10_A_ISR will force exit
        __bis_SR_register(CPUOFF + GIE);
        //For debug only
        __no_operation();
 
 
    }
}
 
// ADC10_A interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(ADC10_VECTOR)))
#endif
void ADC10_A_ISR (void) {
 
    switch (__even_in_range(ADC10IV,12)){
        case  0: break; //No interrupt
        case  2: break; //conversion result overflow
        case  4: break; //conversion time overflow
        case  6: break; //ADC10HI
        case  8: break; //ADC10LO
        case 10: break; //ADC10IN
        case 12:        //ADC10IFG0
            //Move Results from Memory Buffer
            //(Automatically clears ADC10IFG0 by reading memory buffer)
            if (ADC10_A_getResults(ADC10_A_BASE)  < 0){
                //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
                    );
            }
            //Clear CPUOFF bit from 0(SR)
            __bic_SR_register_on_exit(CPUOFF);
            break;
        default: break;
    }
}