EFM32片内外设Timer之基本操作

硬件环境：TG STK

实现的效果：LED灯每1秒闪烁一次 .Timer采用基本定时方式工作。



#include <stdint.h>

#include <stdbool.h>

#include "efm32.h"

#include "efm32_chip.h"

#include "efm32_cmu.h"

#include "efm32_timer.h"

#include "efm32_gpio.h"

//13761 Hz -> 14Mhz (clock frequency) / 1024 (prescaler)

//Setting TOP to 27342 results in an overflow each 2 seconds

#define TOP (13761/2)

void TimerConfig(void)

{

/* Enable clock for TIMER0 module */

CMU_ClockEnable(cmuClock_TIMER0, true);



/* Select TIMER0 parameters */

TIMER_Init_TypeDef timerInit =

{

.enable = true,

.debugRun = true,

.prescale = timerPrescale1024,

.clkSel = timerClkSelHFPerClk,

.fallAction = timerInputActionNone,

.riseAction = timerInputActionNone,

.mode = timerModeUp,

.dmaClrAct = false,

.quadModeX4 = false,

.oneShot = false,

.sync = false,

};



/* Enable overflow interrupt */

TIMER_IntEnable(TIMER0, TIMER_IF_OF);



/* Enable TIMER0 interrupt vector in NVIC */

NVIC_EnableIRQ(TIMER0_IRQn);



/* Set TIMER Top value */

TIMER_TopSet(TIMER0, TOP);



/* Configure TIMER */

TIMER_Init(TIMER0, &timerInit);

}

//中断响应函数

void TIMER0_IRQHandler(void)

{

/* Clear flag for TIMER0 overflow interrupt */

TIMER_IntClear(TIMER0, TIMER_IF_OF);



GPIO_PinOutToggle(gpioPortD, 7);

}

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

* @brief Main function

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

int main(void)

{

/* Chip errata */

CHIP_Init();

CMU_ClockEnable(cmuClock_GPIO, true);

TimerConfig();



GPIO_PinModeSet(gpioPortD, 7, gpioModePushPull, 0);



while(1);

}