adc.c

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#include "main.h"




void ADC_init()
{
    //enableADC 0 module on port D
    SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R3;

    //enable clock for ADC
    SYSCTL_RCGCADC_R |= 0x1;

    //enable port D pin 0 to work as alternate functions
    GPIO_PORTD_AFSEL_R |= 0x01;

    //set pin to input -0
    GPIO_PORTD_DEN_R &= 0b11111110;

    //disable analog isolation for the pin
    GPIO_PORTD_AMSEL_R |= 0x01;

    //initialize the port trigger source as processor (default)
    GPIO_PORTD_ADCCTL_R=0x00;

    //disable SS0 sample sequencer to configure it
    ADC0_ACTSS_R &= ~ADC_ACTSS_ASEN0;

    //initialize the ADC trigger source as processor (default)
    ADC0_EMUX_R = ADC_EMUX_EM0_PROCESSOR;

    //set 1st sample to use the AIN10 ADC pin
    ADC0_SSMUX0_R |= 0x000A;

    //enable raw interrupt status
    ADC0_SSCTL0_R |= (ADC_SSCTL0_IE0 | ADC_SSCTL0_END0);

    //enable oversampling to average
    ADC0_SAC_R |= ADC_SAC_AVG_64X;

    //re-enable ADC0 SS0
    ADC0_ACTSS_R |= ADC_ACTSS_ASEN0;
}