Timer counting accuracy via Wide Timer

Hello.

I am using WT5CCP1 to measure the frequency of a square signal comparing it with an internal Timer of 1 second in Wide Timer 4.

However, the value I get is higher than expected. For example, if I set up my signal generator at 200kHz, I get 205kHz

If I set up 50kHz I get 52kHz, and if I set up 30 kHz I get 31. The scope measures the expected frequency correctly, not the one the launchpad is reading.

Is there anything delaying the internal 1second timer? It happens the same even with a different internal 1 second Timer.

My inizialization code is as follows:

int32_t cuenta_interrupcion=1000;//Measuring  kHz
void init_WTIMER5_READ(void)
{
	MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER5);
	// Enable port PD7 for WTIMER5 WT5CCP1
	// First open the lock and select the bits we want to modify in the GPIO commit register.
	//
	HWREG(GPIO_PORTD_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
	HWREG(GPIO_PORTD_BASE + GPIO_O_CR) = 0x80;

	//SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
	MAP_GPIOPinConfigure(GPIO_PD7_WT5CCP1);
	MAP_GPIOPinTypeTimer(GPIO_PORTD_BASE, GPIO_PIN_7);

	//TimerConfigure(WTIMER5_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_CAP_TIME);	    //Every edge
	TimerConfigure(WTIMER5_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_CAP_COUNT_UP);//FUNCIONA!!!!

	

	// Freeze the timer counting if we are debugging (the counting is enabled automatically with the cpu).
	//TimerControlStall(WTIMER5_BASE, TIMER_B, true);

	 TimerControlEvent(WTIMER5_BASE,TIMER_B,TIMER_EVENT_POS_EDGE);



	    TimerLoadSet(WTIMER5_BASE, TIMER_B, cuenta_interrupcion+1);  // 1MHz OK
	    TimerMatchSet(WTIMER5_BASE,TIMER_B, cuenta_interrupcion+1);

	//TimerLoadSet(WTIMER5_BASE, TIMER_B, 1600);  //Count for 50KHz at 80MHz clock.
	//TimerMatchSet(WTIMER5_BASE, TIMER_B, 800);  //50% duty cycle at init


	//  TimerIntRegister(WTIMER5_BASE, TIMER_B, WTimer5BIntHandler);

	  // TimerIntEnable(WTIMER5_BASE, TIMER_CAPB_EVENT);//Every edge
	TimerIntEnable(WTIMER5_BASE, TIMER_CAPB_MATCH); //FUNCIONA!!
	TimerEnable(WTIMER5_BASE, TIMER_B);

	IntEnable(INT_WTIMER5B);

	
}

void InitTimer_1sec()
{//Timer 1 second

//SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
ROM_SysCtlPeripheralEnable (SYSCTL_PERIPH_WTIMER4);
TimerConfigure(WTIMER4_BASE, TIMER_CFG_PERIODIC);
TimerLoadSet(WTIMER4_BASE, TIMER_A, ROM_SysCtlClockGet() );//Tried also with value: ROM_SysCtlClockGet() -1
IntEnable(INT_WTIMER4A);
TimerIntEnable(WTIMER4_BASE, TIMER_TIMA_TIMEOUT);
TimerEnable(WTIMER4_BASE, TIMER_A);
}

The interrrupt routines are:

void WTimer5BIntHandler(void)

{//COUNTER INTERRUPT



//TimerIntClear(WTIMER5_BASE, TIMER_CAPB_EVENT);//Para cada una
//TimerIntEnable(WTIMER5_BASE, TIMER_CAPB_MATCH); //FUNCIONA!!



cont_wTimer5B++;
cont_wTimer5B_periodo++;




TimerIntClear(WTIMER5_BASE, TIMER_CAPB_MATCH);




}

void WTimer4AIntHandler(void)
{//1second interrupt


//
// Clear the timer interrupt.
//

TimerIntClear(WTIMER4_BASE, TIMER_TIMA_TIMEOUT);



contador_pulsos_Hz=cont_wTimer5B_periodo;
cont_wTimer5B_periodo=0;


flag_print=true;


/* TimerLoadSet(WTIMER4_BASE, TIMER_A, ROM_SysCtlClockGet()-1 );
TimerEnable(WTIMER4_BASE, TIMER_A);/**/
}

In the while loop:

if (flag_print)
{
flag_print=false;
UARTprintf("FREQ: %d kHz ",contador_pulsos_Hz);

}