REG- Capture interrupt in TM4C123

Hello Yuvaraj,

What is the trouble that you are facing? The question you have asked is too broad to answer. Please list a specific problem when developing the application or system, so that we can help you better.

Thanks,
Sai

Hello Sai,

I am connected external sensor input to PB0 pin, My problem is the interrupt occurred whenever sensor input is low, but i can't read exact timer value for speed calculation. I am paste my code below

Regards

Yuvaraj

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "grlib/grlib.h"
#include "utils/ustdlib.h"

//*****************************************************************************

uint32_t g_ui32Flags;
volatile uint32_t g_ui32IntCount;
tContext g_sContext;

#define PRINT_BUFF_SIZE 8
char g_pcPrintBuff[PRINT_BUFF_SIZE];

unsigned long temp_long, temp_long1;
unsigned char temp, temp1;

void Timer2IntHandler();

void ProcessInterrupt(void)
{
    g_ui32IntCount++;

    if(temp == 0)
    {
        temp = 12;
        temp_long = TimerValueGet(TIMER2_BASE, TIMER_A);
    }
    else
    {
        temp_long1 = TimerValueGet(TIMER2_BASE, TIMER_A);
        temp = 0;
        temp_long1 = 0;
        temp_long = 0;
    }

}

void MainLoopRun(void)
{
    uint32_t ui32Count, ui32LastCount;
    ui32LastCount = 10;
    while(1)
    {
        if(ui32Count != ui32LastCount)
        {
            ui32LastCount = ui32Count;
        }
        if(HWREGBITW(&g_ui32Flags, 0))
        {
            HWREGBITW(&g_ui32Flags, 0) = 0;
        }
    }
}

void Timer2IntHandler(void)
{
    TimerIntClear(TIMER2_BASE, TIMER_CAPA_MATCH);

    ProcessInterrupt();
    TimerEnable(TIMER2_BASE, TIMER_A);
}

int main(void)
{
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

    GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_0);
    GPIOPinConfigure(GPIO_PB0_T2CCP0);

    MAP_GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_0, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
    IntMasterEnable();

    TimerConfigure(TIMER2_BASE, (TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_CAP_COUNT));
    TimerControlEvent(TIMER2_BASE, TIMER_A, TIMER_EVENT_POS_EDGE);
    TimerLoadSet(TIMER2_BASE, TIMER_A, 2500);
    TimerMatchSet(TIMER2_BASE, TIMER_A, 0);

    IntEnable(INT_TIMER2A);
    TimerIntEnable(TIMER2_BASE, TIMER_CAPA_MATCH);

    TimerEnable(TIMER2_BASE, TIMER_A);

    MainLoopRun();
}