Problem into the interrupt while using time capture

Hello Wen,

What is the System Clock configured as for the TM4C123 and what is the input toggle rate?

Regards

Amit

SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_OSC | SYSCTL_XTAL_16MHZ |
		SYSCTL_OSC_MAIN);

3.2MHz, and the input frequency is much lower, <1kHz

I tried to get the timer's value, which decreased from the load value to the "match value+1" or "match value +2", which is very strange.

Hello Jeff,

The value of the timer will decrease as it is in down count mode. I will need to run the code on my side to see why it is not generating an interrupt.

Can you share the interrupt routine as well.

Regards

Amit

It's nice of you!

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/sysctl.h"
#include "driverlib/pin_map.h"
#include "utils/uartstdio.h"
#include "driverlib/pwm.h"
#include "driverlib/timer.h"
#include "inc/hw_ints.h"
#include "driverlib/interrupt.h"

void LightLed(void);
void left(void)
{
	TimerIntClear(TIMER1_BASE, TIMER_CAPA_MATCH);//clear the interrupt
	UARTprintf("\nhello world!\n");
}

//*****************************************************************************
//To init the motor's pins, start to output after the func been called 
//!!!must called after the ServoInit
//*****************************************************************************
void ACMotorInit(void)
{
	
	SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
	//Config the timer
	TimerConfigure(TIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_CAP_COUNT);
	//Config B6 as T0CCP0
	GPIOPinConfigure(GPIO_PB6_T0CCP0);
	GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_6);
	//Event ctl
	TimerControlEvent(TIMER0_BASE, TIMER_A, TIMER_EVENT_NEG_EDGE);
	//Load set
	TimerLoadSet(TIMER0_BASE, TIMER_A, 99);
	TimerMatchSet(TIMER0_BASE, TIMER_A, 50);


	//Timer int enable
	TimerIntRegister(TIMER0_BASE, TIMER_A, left);
	TimerIntEnable(TIMER0_BASE, TIMER_CAPA_MATCH);
	IntEnable(INT_TIMER0A);
	IntMasterEnable();
	//TimerIntRegister(TIMER1_BASE, TIMER_B, LightLed);
	//Timer enable
	TimerEnable(TIMER0_BASE, TIMER_A);
}

It's quiet simple. thanks

You're unbelievable!!!