#include <stdint.h>

#define RCC_Base 0x40021000
#define GPIOD_Base 0x50000C00

//Pointer declarations
uint32_t *RCC_Enable_Reg = (uint32_t*) (RCC_Base+0x34);	//Pointer to AHB1 Enable register
uint32_t *GPIO_Mode_Reg = (uint32_t*) (GPIOD_Base+0x00);	//Pointer to Mode register of Port D
uint32_t *GPIOD_OutReg = (uint32_t*) (GPIOD_Base+0x14);	//POinter to Output data register of Port D

//Function prototyping
void GPIO_init();
void delay();



//Initialization function
void setup()
{
	*RCC_Enable_Reg |= (1<<3);	//Enable clock to Port D
	*GPIO_Mode_Reg |= (1<<0);	//Bit 0 is configured as HIGH to make GPIOD0 as output pin
	*GPIO_Mode_Reg &= ~(1<<1); //Bit 1 is configures as LOW to make GPIOD0 as output pin
}
//main function
void loop()
{
  *GPIOD_OutReg ^= (1<<0);	//GPIOD12 is HOGH & LED is ON
	delay(1000);
	//*GPIOD_OutReg &= ~(1<<0);	//GPIOD12 is LOW & LED is OFF
	//delay(10);
}