#include <stdint.
h> //required for uint32_t datatype
#define PERIPHERAL_BASE (0x40000000UL)
#define APB2_OFFSET 0x00010000UL)
#define APB2_BASE (PERIPHERAL_BASE +
APB2_OFFSET)
#define GPIOA_OFFSET (0x00000800UL)
#define GPIOA_BASE (APB2_BASE +
GPIOA_OFFSET)
#define RCC_OFFSET (0x00021000UL)
#define RCC_BASE (PERIPHERAL_BASE +
RCC_OFFSET)
#define PIN5 /*Your code here*/
#define IOPORT_A (1UL<<2)
#define __IO volatile //__IO is same as volatile .It is as per
MISRA C standard.
typedef struct
{
__IO uint32_t CRL;
__IO uint32_t UNUSED_REGS[2]; //__IO uint32_t CRH; //__IO uint32_t
IDR;
__IO uint32_t ODR;
/* __IO uint32_t BSRR;
__IO uint32_t BRR;
__IO uint32_t LCKR;*/
} GPIO_TypeDef;
typedef struct
{
/*__IO uint32_t CR;
__IO uint32_t CFGR;
__IO uint32_t CIR;
__IO uint32_t APB2RSTR;
__IO uint32_t APB1RSTR;
__IO uint32_t AHBENR;*/
__IO uint32_t UNUSED_REGS[6];
__IO uint32_t APB2ENR;
/* __IO uint32_t APB1ENR;
__IO uint32_t BDCR;
__IO uint32_t CSR;*/
} RCC_TypeDef;
#define RCC ((RCC_TypeDef*)RCC_BASE) //RCC_BASE typecasted to
RCC_Typedef type pointer
#define GPIOA ((GPIO_TypeDef*)GPIOA_BASE) //GPIOA_BASE typecasted
to GPIO_Typedef type pointer
int main (void) {
/*Your code here*/
while(1){
/*Your Code here*/
