#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/sysctl.h"
#include "driverlib/adc.h"
#include "driverlib/gpio.h"

uint32_t g_adcSS1RawData[4];

void systemClock(void);
void adcInit(void);
void adcRead(void);

void main(void)
{
    uint32_t indexCounter;
    //Initialize system clock from external oscillator
     systemClock();
     //Initialize ADC
     adcInit();
     //Start Reading from ADC
     for(indexCounter = 0; indexCounter < 100; indexCounter++)
     {
        adcRead();
     }
     //Re-initialize system clock
     systemClock();
     while(1)
     {
     }
}


void systemClock(void)
{
    // Set the clock to run directly from the external crystal/oscillator at 16MHz.
    SysCtlClockSet((uint32_t)SYSCTL_SYSDIV_1 | (uint32_t)SYSCTL_USE_OSC | \
      (uint32_t)SYSCTL_OSC_MAIN | (uint32_t)SYSCTL_XTAL_16MHZ);
}
void adcInit(void)
{
    //Use PLL for ADC
    SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ);
    //Enable ADC0 module
    SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
    //Configure clock for ADC0
    ADCClockConfigSet(ADC0_BASE, ADC_CLOCK_SRC_PLL | ADC_CLOCK_RATE_FULL, 24);
    //Configure GPIO pins to be used as ADC inputs
    GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
    //Disable ADC sample sequencers before configuring
    ADCSequenceDisable((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1);
    //Configure ADC sample sequencer1
    ADCSequenceConfigure(ADC0_BASE, ADC_SAMPLE_SEQUENCER1, ADC_TRIGGER_PROCESSOR, 0U);
    //Configure current sense values of 12V, 5V regulators as inputs of sample sequencer1
    ADCSequenceStepConfigure(ADC0_BASE, 1, \
      0, ADC_CTL_CH3);
    ADCSequenceStepConfigure(ADC0_BASE, 1, \
      1, ADC_CTL_CH2);
    ADCSequenceStepConfigure(ADC0_BASE, 1, \
      2, ADC_CTL_CH0);
    ADCSequenceStepConfigure(ADC0_BASE, 1, \
      3, ADC_CTL_CH1|ADC_CTL_IE|ADC_CTL_END);
    //Enable sample sequencers
    ADCSequenceEnable(ADC0_BASE, ADC_SAMPLE_SEQUENCER1);
}

void adcRead(void)
{
    //Enable interrupt for sample sequencer 1 of ADC0
    ADCIntEnable((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1);
    //clear interrupt source for sample sequencer 1 of ADC0
    ADCIntClear((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1);
    //Configure processor to trigger ADC conversion
    ADCProcessorTrigger((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1);
    //wait until ADC conversion completes
    while (ADCIntStatus((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1, false) != 0U)
    {

    }
    //Captures the data from sample sequencer 1 of ADC0
    if(ADCSequenceDataGet((uint32_t)ADC0_BASE, (uint32_t)ADC_SAMPLE_SEQUENCER1, g_adcSS1RawData) == 0)
    {

    }
}