#include "stm32f4xx.h"
#include "stm32f4xx_rcc.c"
#include "stm32f4xx_gpio.c"
#include "stm32f4xx_tim.c"
#include "dd.h"

// initialize port E, Gpio_Pin_8 to GPIO_Pin_15 as outputs
void GPIOEinit (void)   {
GPIO_InitTypeDef        GPIO_InitStructure;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
  GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_8  | GPIO_Pin_9  | GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Pin  |= GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOE, &GPIO_InitStructure); 
}


// Timer 5 init function - time base
void TIM5init_TimeBase_ReloadIRQ (int interval)  {
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,  ENABLE);
  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInitStructure.TIM_Period = interval;
  TIM_TimeBaseInitStructure.TIM_Prescaler = 0;
  TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStructure);

  NVIC_EnableIRQ(TIM5_IRQn);                 // Enable IRQ for TIM5 in NVIC 
  TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE); // Enable IRQ on update for Timer5

  TIM_Cmd(TIM5, ENABLE);
}   

void main(void) {

  GPIOEinit ();
  TIM5init_TimeBase_ReloadIRQ (84000);           // 84000 == 1ms
  
  while (1) {};
}

// IRQ function for Timer5
void TIM5_IRQHandler(void)       {
int i;
  TIM_ClearITPendingBit(TIM5, TIM_IT_Update); // clear interrupt flag
  GPIOE->ODR |=  BIT_8;        for (i=0; i<10; i++) {};
  GPIOE->ODR &= ~BIT_8;        for (i=0; i<10; i++) {};
  GPIOE->ODR |=  BIT_8;        for (i=0; i<10; i++) {};
  GPIOE->ODR &= ~BIT_8;        
}