#include "stm32f4xx.h"
#include "stm32f4_discovery.h"

int x;
int main(void)
{
	/*Structures used in the configuration*/
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable TIM4 Clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  /* Enable GPIOD Pins that are used for on board LED's */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  //Enabled GPIOB we are going to use PB6 which is linked to TIM4_CH1 according to the
  //documentation


  /* Initialise  pins 13, 14 and 15 D - relating to on board LED's*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOD, &GPIO_InitStructure);



  GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);
  /* Setup timer defaults */
  TIM_TimeBaseStructure.TIM_Period = 840;//665;
  TIM_TimeBaseStructure.TIM_Prescaler = 100;//PrescalerValue;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);


  /* Configure timer for PWM - channel 2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);

  /* Configure timer for PWM - channel 3*/


  /* Configure timer for PWM - channel 4 */


  TIM_ARRPreloadConfig(TIM4, ENABLE);

  /* Start timer*/
  TIM_Cmd(TIM4, ENABLE);

  int power = 0, j=0;
  while(1)  //Loop forever
  {

	  TIM4->CCR2 = 100;//

	   x=GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_13);
	  for(j=0; j<80000; j++);
	  power++;
	  if(power > 699){
		  power = 0;
		  for(j=0; j<80000; j++);
	  }
    }
}