#include <stdint.h>

#define RCC_Base 0x40021000
#define GPIOC_Base 0x50000800
#define TIM2_Base 0x40000000

//Pointer declarations
uint32_t *AHB1ENR = (uint32_t*)(RCC_Base + 0x34);
uint32_t *APB1ENR = (uint32_t*) (RCC_Base + 0x3C);
uint32_t *GPIOC_Moder = (uint32_t*) (GPIOC_Base + 0x00);
uint32_t *GPIOC_OutReg = (uint32_t*)(GPIOC_Base + 0x14);
uint32_t *TIM2_SR = (uint32_t*)(TIM2_Base + 0x10);
uint32_t *TIM2_PSC = (uint32_t*)(TIM2_Base + 0x28);
uint32_t *TIM2_ARR = (uint32_t*)(TIM2_Base + 0x2C);
uint32_t *TIM2_CNT = (uint32_t*)(TIM2_Base + 0x24);
uint32_t *TIM2_CR1 = (uint32_t*)(TIM2_Base + 0x00);

void setup()
{
  GPIO_init();
  TIM2_init();
	*TIM2_CR1 |= (1 << 0);		//Start TIM2
}

void loop()
{
  *GPIOC_OutReg |= (1 << 6);
  TIM2_delay();
  *GPIOC_OutReg &= ~(1 << 6);
	delay(1000);
  //TIM2_delay();
}
//GPIO Initialization
void GPIO_init()
{
  *AHB1ENR = (1 << 2);	//Enabling clock to GPIOC
  *APB1ENR = (1 << 0);	//Enabling clock to TIM2
  *GPIOC_Moder |= (1 << 12);
  *GPIOC_Moder &= ~(1 << 13);
}

void TIM2_init()
{
  *TIM2_PSC = 84000-1;	//Pre-scalar value
  *TIM2_ARR = 1000-1;		//Auto reload value
  *TIM2_CNT = 0;			//Counter is initialized to ZERO
}
//Delay function
void TIM2_delay()
{
  while (!(*TIM2_SR & (1 << 0)));	//Wait for TIM2 overflow
  *TIM2_SR &= ~(1 << 0);			//Reset SR.0 to ZERO
}