ADC interrupt Code for TIVA

Hello Utpal,

What exactly is the trouble? Putting such information out would be more useful.

Also if you do a search on the forum for ADC issues being discussed, you would see plenty of attachments and code posted by forum members.

Regards

Amit

Hi, this is the code i use in order to access the ADC interrupts periodically triggered by the timer0:

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/tm4c123gh6pm.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/adc.h"
#include "driverlib/rom.h"
#include "driverlib/timer.h"
#include "driverlib/interrupt.h"

// ****** Constants ******
const int sampleFreq = 8000; // Sample Frequency

// ****** Variables ******
uint32_t ADC0Value[1];
uint16_t samplePeriod;

// Definitions
void systemSetup(void){
	// *** Clock
	ROM_SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);

	// *** Peripheral Enable
	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

	// *** ADC0
	ROM_ADCHardwareOversampleConfigure(ADC0_BASE,4);
	ROM_ADCReferenceSet(ADC0_BASE,ADC_REF_INT);
	ROM_ADCSequenceConfigure(ADC0_BASE,3,ADC_TRIGGER_TIMER,0);
	ROM_ADCSequenceStepConfigure(ADC0_BASE,3,0,ADC_CTL_CH7|ADC_CTL_IE|ADC_CTL_END);
	ROM_ADCSequenceEnable(ADC0_BASE,3);

	// *** Timer0
	ROM_TimerConfigure(TIMER0_BASE,TIMER_CFG_PERIODIC);
	samplePeriod = ROM_SysCtlClockGet()/sampleFreq;
	ROM_TimerLoadSet(TIMER0_BASE,TIMER_A,samplePeriod - 1);
	ROM_TimerControlTrigger(TIMER0_BASE,TIMER_A,true);

	// *** GPIO
	ROM_GPIOPinTypeADC(GPIO_PORTD_BASE,GPIO_PIN_0);

	// *** Interrupts
	ROM_IntEnable(INT_TIMER0A);
	ROM_TimerIntEnable(TIMER0_BASE,TIMER_TIMA_TIMEOUT);
	ROM_IntEnable(INT_ADC0SS3);
	ROM_ADCIntEnable(ADC0_BASE,3);

	ROM_IntMasterEnable();
	ROM_TimerEnable(TIMER0_BASE,TIMER_A);
}

// Main program
int main(void) {
	systemSetup();

	while(1){
	}
}

// Interrupts
void Timer0IntHandler(void){
	ROM_TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
}

void ADC0SS3IntHandler(void){
	ROM_ADCIntClear(ADC0_BASE,3);

	ROM_ADCSequenceDataGet(ADC0_BASE,3,ADC0Value); // Get Data from ADC and store it in ADC0Value
}

Don't forget to add the Timer0IntHandler and ADC0SS3IntHandler to the vector table. I hope it will be useful for you.

Hello Edgar,

Thanks for sharing your code. The forum would find it useful with more such code examples from members.

Regards

Amit

Thank you Edgar,

This is indeed a very nice, clean and short example.
Especially as I yet wasn't able to find any examples in the TivaWare for ADC with Intrerrupts.