main.c

#include "stm32f4xx.h"
#include "stm32f4xx_conf.h"
//#include "stm32f4xx_it.h"


static void LED_Init (void);
static void TIM_Config(void);
static void EnableTimer3Interrupt(void);


TIM_TimeBaseInitTypeDef timerInitStructure;


void TIM3_IRQHandler(void)
 {
 if(TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
 {
 TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
    GPIO_ToggleBits(GPIOG, GPIO_Pin_14);
 }
 }



int main(void){


    TIM_Config();
    EnableTimer3Interrupt();
    LED_Init();

    GPIO_SetBits(GPIOG, GPIO_Pin_13);

    while(1){

    //GPIO_SetBits(GPIOG, GPIO_Pin_13);


    }

}


/*--------------------------------------------------*/

void LED_Init (void) {
 GPIO_InitTypeDef GPIO_InitStructure; // LED Port Info

 // Enable the port clock
 RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOG, ENABLE);

 // Prepare the port info
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14; // Line 12
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // As Output
 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz; // At 100MHz
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // Without pull-up-down

    // Initialize the port
 GPIO_Init (GPIOG, &GPIO_InitStructure); }


 /*-------------------------------------------*/

 void EnableTimer3Interrupt(void)
 {
 NVIC_InitTypeDef NVIC_InitStructure;


 /* Enable the TIM3 global Interrupt */
 NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure);
 }


 /*--------------------------------------------------*/


 void TIM_Config(void)
 {
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* Time base configuration */
    timerInitStructure.TIM_Prescaler = 40000;
    timerInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    timerInitStructure.TIM_Period =500;
    timerInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    timerInitStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM3, &timerInitStructure);

         /* TIM Interrupts enable */
     TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
     /* TIM2 enable counter */
    TIM_Cmd(TIM3, ENABLE);

 }


 //end file