#include <stdint.h>

typedef struct
{
  uint32_t MODER;   // mode register,                  offset: 0x00
  uint32_t OTYPER;  // output type register,           offset: 0x04
  uint32_t OSPEEDR; // output speed register,          offset: 0x08
  uint32_t PUPDR;   // pull-up/pull-down register,     offset: 0x0C
  uint32_t IDR;     // input data register,            offset: 0x10
  uint32_t ODR;     // output data register,           offset: 0x14
  uint16_t BSRRL;   // bit set/reset low register,     offset: 0x18
  uint16_t BSRRH;   // bit set/reset high register,    offset: 0x1A
  uint32_t LCKR;    // configuration lock register,    offset: 0x1C
  uint32_t AFRL; // GPIO alternate function registers, offset: 0x20
  uint32_t AFRH; // GPIO alternate function registers, offset: 0x24
} GPIO_t;