main.cpp

#include "stm32f10x.h"

void delay(uint32_t);

int main()
{
	//Enabling the peripheral for the GPIOC in RCC sector
	RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;

	//the led is connected to PC13 in Mini dev board.
	//it would be push-pull configuration (Page = 160 and 171)
	//CNF13[1:0] = 2'b00
	//bit 23 and 22
	//MODE13[1:0] = 2'b11
	//bit 21 and 20
	GPIOC->CRH |=(0<<23)|(0<<22)|(1<<21)|(1<<20);

	//Now putting a initial value in the output data register (Page = 172)
	//ODR is used as Read-Modify-Write manner
	//BSRR is used as set and reset mode using only write mode ,
	//hence supporting atomic operations (Interrupt related)
	GPIOC->ODR |= (1<<13);

	while(1)
	{
		//setting a bit set in PIN 13. (page = 172)
		GPIOC->BSRR = (1<<13);
		delay(1);
		//setting a bit reset in PIN 13. (location bit = 29)
		GPIOC->BSRR = (1<<29);
		delay(1);
	}
}

void delay(uint32_t seconds)
{
	uint32_t i = 0;
	while(i<1500000)
	{
		i++;
	}
	return;
}