stm32f0_timer

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stm32f0xx_gpio.h>
#include <stm32f0xx_rcc.h>
#include <stm32f0xx_tim.h>

//Define onboard LED’s
#define GreenLED GPIO_Pin_8
#define BlueLED GPIO_Pin_9
#define LEDGPIO GPIOC
#define LEDToggleValue ((uint16_t) 3000)

//Initialization structs
GPIO_InitTypeDef LEDs;
TIM_TimeBaseInitTypeDef TTB;

int main(void)
{
//Initialize system and ensure core clock is up to date
          SystemInit();
          SystemCoreClockUpdate();

          //Enable GPIO Clock
          RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
          RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

          //Initialize LEDs
          LEDs.GPIO_Pin = GreenLED | BlueLED;
          LEDs.GPIO_Mode = GPIO_Mode_OUT;
          LEDs.GPIO_OType = GPIO_OType_PP;
          LEDs.GPIO_PuPd = GPIO_PuPd_NOPULL;
          LEDs.GPIO_Speed = GPIO_Speed_Level_3;
          GPIO_Init(LEDGPIO, &LEDs);

          //Initialize and enable timer to have a maximum period for 16bits
//running at a frequency of 48MHz/(65535*(1000 – 1)) = 0.732Hz
          TTB.TIM_ClockDivision = TIM_CKD_DIV1;
          TTB.TIM_CounterMode = TIM_CounterMode_Up;
          TTB.TIM_Period = 0xFFFF;
          TTB.TIM_Prescaler = 1000;
          TTB.TIM_RepetitionCounter = 0;
          TIM_TimeBaseInit(TIM1, &TTB);
          TIM_Cmd(TIM1, ENABLE);

          uint16_t CurrentTimerVal = 0;

          while(1)
          {
//Store current timer value in variable
                    CurrentTimerVal = TIM_GetCounter(TIM1);

                    //See if current timer value is more than LED toggle value
                    if(CurrentTimerVal>LEDToggleValue){
                              GPIO_SetBits(LEDGPIO, GreenLED);
                              GPIO_ResetBits(LEDGPIO, BlueLED);
                    }
                    else{
                              GPIO_ResetBits(LEDGPIO, GreenLED);
                              GPIO_SetBits(LEDGPIO, BlueLED);
                    }
          }
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif