https://Hybridego.net/ <Ho Cheol Jeon>

Timer 사용하기

Embeded : 2009. 1. 5. 22:48

#include "../../../hw_ints.h"
#include "../../../hw_memmap.h"
#include "../../../hw_types.h"
#include "../../../src/debug.h"
#include "../../../src/gpio.h"
#include "../../../src/interrupt.h"
#include "../../../src/sysctl.h"
#include "../../../src/watchdog.h"
#include "../../../src/timer.h"
#include "../rit128x96x4.h"

//*****************************************************************************
//
//! \addtogroup ek_lm3s8962_list
//! <h1>Watchdog (watchdog)</h1>
//!
//! This example application demonstrates the use of the watchdog as a simple
//! heartbeat for the system.  If the watchdog is not periodically fed, it will
//! reset the system.  Each time the watchdog is fed, the LED is inverted so
//! that it is easy to see that it is being fed, which occurs once every
//! second.
//
//*****************************************************************************

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

//*****************************************************************************
// The interrupt handler for the watchdog.  This feeds the dog (so that the
// processor does not get reset) and winks the LED.
//*****************************************************************************
void
WatchdogIntHandler(void)
{
/*	
    //
    // Clear the watchdog interrupt.
    //
    WatchdogIntClear(WATCHDOG_BASE);

//
    // Invert the GPIO F0 value.
    //
    GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0,
                 GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_0) ^ GPIO_PIN_0);
*/
}
void myTimer(void);

int main(void)
{

//
    // Set the clocking to run directly from the crystal.
    //
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_8MHZ);

///LED Setting-----------------------------*
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);//port A enable
    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_1);//port A3을 output type으로
    GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_1,GPIO_PIN_1);//LED turn off

//Timer Setting-------------------------------*
    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);//timer0 using
    TimerConfigure(TIMER0_BASE,TIMER_CFG_32_BIT_PER);//32-BIT PERIODIC TIMER
    TimerLoadSet(TIMER0_BASE,TIMER_A,8000000);
    //8MB이므로 8000000값을 넣어 1초에 한번 값을 클럭을 주게 설정.

TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);//timerA interrupt using
    TimerIntRegister(TIMER0_BASE,TIMER_A, myTimer);
    //timer interrupt 발생시 myTimer 라는 함수의 이벤트 발생
    TimerEnable(TIMER0_BASE,TIMER_A);//timer 시작.
    while(1){}
}

int turn =0;
void myTimer(void)
{
	if (turn)
		{
			GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_1,GPIO_PIN_1);
			turn=0;
		}
	else
		{
			GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_1,0);
			turn=1;
		};
	TimerIntClear(TIMER0_BASE,TIMER_TIMA_TIMEOUT);//timer clear
}