ADC TM4C123GH6PM

Other Parts Discussed in Thread: TM4C123GH6PM

Hi,

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


uint32_t ui32ADC0Value[4];			// TO STORE THE VALUE IN VARIABLE ui32ADC0Value FOR EVERY SAMPLING
volatile uint32_t ui32TempAvg;		// AVERAGE VALUE OF SAMPLED SIGNAL WILL BE STORE IN VARIABLE ui32TempAvg
volatile uint32_t ui32TempValueC;
volatile uint32_t ui32TempValueF;

int main(void)
{

	SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ); // SYSTEM CLOCK AT 40MHZ

	SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);			// ENABLE ADC0 MODULE

	ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0); 	// ADC0 MODULE, TRIGGER IS PROCESSOR EVENT, SEQUENCER 0 IS CONFIGURED
	ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS);			// ADC0 MODULE, SEQUENCER 0 , FOR 1 SAMPLING, INPUT IS INTERNAL TERMPERATURE SENSOR
	ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_TS);			// ADC0 MODULE, SEQUENCER 0 , FOR 2 SAMPLING, INPUT IS INTERNAL TERMPERATURE SENSOR
	ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_TS);			// ADC0 MODULE, SEQUENCER 0 , FOR 3 SAMPLING, INPUT IS INTERNAL TERMPERATURE SENSOR
	ADCSequenceStepConfigure(ADC0_BASE,1,3,ADC_CTL_TS|ADC_CTL_IE|ADC_CTL_END);	// ADC0 MODULE, SEQUENCER 0 , FOR 4 SAMPLING,INPUT IS INTERNAL TERMPERATURE SOR,
																	

			//	AND TO DENOTE THAT THIS IS LAST SAMPLING CONVERSIONA AND INTERRUPT IS ENABLED, TO DENOTE THE CONVERSION IS OVER OR NOT
	ADCSequenceEnable(ADC0_BASE, 1);								// ENABLE THE SEQUENCE 1 FOR ADC0

	while(1)
	{
	   ADCIntClear(ADC0_BASE, 1);									// CLEAR INTERRUPT FLAG FOR ADC0, SEQUENCER 1
	   ADCProcessorTrigger(ADC0_BASE, 1);							// TRIGGER IS GIVEN FOR ADC 0 MODULE,SEQUENCER 1

	   while(!ADCIntStatus(ADC0_BASE, 1, false))					// CHECK WHETHER THE CONVERSION IS OVER OR NOT
	   {
	   }

	   ADCSequenceDataGet(ADC0_BASE, 1, ui32ADC0Value);				// STORE THE CONVERTED VALUE FOR ALL DIFFERENT SAMPLING IN ARRAY ui32ADC0Value
	   ui32TempAvg = (ui32ADC0Value[0] + ui32ADC0Value[1] + ui32ADC0Value[2] + ui32ADC0Value[3])/4; // TAKING THE AVERAGE
	   ui32TempValueC = (1475 - ((2475 * ui32TempAvg)) / 4096)/10;		// CONVERSION FOR CELSIUS
	   ui32TempValueF = ((ui32TempValueC * 9) + 160) / 5;				// CONVERSION FOR FAHRENHEIT
	}
}

I have doubt in the above code : 

1) Is it possible to get the ADC value without enabling interrupt ? (ADC_CTL_IE)

2)  ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS);     - This line denotes that the input signal is sampled once ??? is it correct.

Need a explanation for the lines below

ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0);

ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS);

ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_TS);

ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_TS);

ADCSequenceStepConfigure(ADC0_BASE,1,3,ADC_CTL_TS|ADC_CTL_IE|ADC_CTL_END);