#include "stm32f4xx.h"
#include "stm32f4_discovery.h"
int counter;

int main(void)
{

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

	GPIO_InitTypeDef  GPIO_InitStructure;
	GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
	GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);
	GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_TIM4);
	GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15 ;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_TimeBaseStructure.TIM_Period = 99;
	TIM_TimeBaseStructure.TIM_Prescaler = 16799;
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode =  TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

	TIM_OC1Init(TIM4, &TIM_OCInitStructure);
	TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);

	TIM_OC2Init(TIM4, &TIM_OCInitStructure);
	TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);

	TIM_OC3Init(TIM4, &TIM_OCInitStructure);
	TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);

	TIM_OC4Init(TIM4, &TIM_OCInitStructure);
	TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

	TIM_Cmd(TIM4, ENABLE);


	int a=0;
	int b=0;
	int c=0;
	int d=0;
	for(;;)
	{

		if(TIM_GetFlagStatus(TIM4, TIM_FLAG_Update)) {


			TIM4 -> CCR1 = a;
			a+=1;
			if(a > 99) a = 0;
			if(a>10 || b !=0 )
			{
			TIM4 -> CCR2 = b;
			b+=1;
			if(b > 99) b = 0;
			}
			if(a>20 || c !=0 )
			{
			TIM4 -> CCR3 = c;
			c+=1;
			if(c > 99) c = 0;
			}

			if(a>30 || d !=0 )
			{
			TIM4 -> CCR4 = d;
			d+=1;
			if(d > 99) d = 0;
			}


			TIM_ClearFlag(TIM4, TIM_FLAG_Update);
		}


	}
}