gpio.h

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#ifndef GPIO_H
#define GPIO_H
 
/* -- Includes -- */
#include <stdint.h>
#include "stm32f4xx.h"
#include "defines.h"
 
/* -- Structs -- */
struct __attribute__((packed)) GPIORegs {
  REG32 MODER;
  REG32 OTYPER;
  REG32 OSPEEDR;
  REG32 PUPDR;
  REG32 IDR;
  REG32 ODR;
  REG32 BSSR;
  REG32 LCKR;
  REG32 AFR[2];
};
 
_Static_assert((sizeof(struct GPIORegs)) == (sizeof(uint32_t) * 10U),
               "GPIO register struct size mismatch. Is it aligned?");
 
#ifndef UTEST
#define GPIO(bank)                                                             \
  (struct GPIORegs *)(GPIOA_BASE + (0x400U * ((uint8_t)bank - (uint8_t)'A')))
#else
extern struct GPIORegs *GPIO(const uint8_t bank);
#endif
 
/* -- Enums -- */
typedef enum gp_bank {
#ifdef GPIOA_BASE
  GP_BANK_A = (uint8_t)'A',
#endif
#ifdef GPIOB_BASE
  GP_BANK_B = (uint8_t)'B',
#endif
#ifdef GPIOC_BASE
  GP_BANK_C = (uint8_t)'C',
#endif
#ifdef GPIOD_BASE
  GP_BANK_D = (uint8_t)'D',
#endif
#ifdef GPIOE_BASE
  GP_BANK_E = (uint8_t)'E',
#endif
#ifdef GPIOF_BASE
  GP_BANK_F = (uint8_t)'F',
#endif
#ifdef GPIOG_BASE
  GP_BANK_G = (uint8_t)'G',
#endif
#ifdef GPIOH_BASE
  GP_BANK_H = (uint8_t)'H',
#endif
#ifdef GPIOI_BASE
  GP_BANK_I = (uint8_t)'I',
#endif
#ifdef GPIOJ_BASE
  GP_BANK_J = (uint8_t)'J',
#endif
#ifdef GPIOK_BASE
  GP_BANK_K = (uint8_t)'K',
#endif
  GP_BANK_LEN // This should be substracted with 'A'
} gp_bank_t;
 
typedef enum gp_dir {
  GP_DIR_IN = 0x00,
  GP_DIR_OU = 0x01,
  GP_DIR_AL = 0x02,
  GP_DIR_AN = 0x03
} gp_dir_t;
 
typedef enum gp_otype {
  GP_OTYPE_PP = 0x00,
  GP_OTYPE_OD = 0x01
} gp_otype_t;
 
typedef enum gp_speed {
  GP_SPEED_LOW = 0x00,
  GP_SPEED_MED = 0x01,
  GP_SPEED_FAS = 0x02,
  GP_SPEED_HIG = 0x03
} gp_speed_t;
 
typedef enum gp_pupd {
  GP_PUPD_NONE = 0x00,
  GP_PUPD_PLUP = 0x01,
  GP_PUPD_PLDO = 0x02,
} gp_pupd_t;
 
void gp_set_direction(const gp_bank_t bank, const uint8_t pin,
                      const gp_dir_t dir);
 
void gp_set_output_type(const gp_bank_t bank, const uint8_t pin,
                        const gp_otype_t type);
 
void gp_set_speed(const gp_bank_t bank, const uint8_t pin,
                  const gp_speed_t speed);
 
void gp_set_pupd(const gp_bank_t bank, const uint8_t pin,
                 const gp_pupd_t poopdr);
 
void gp_set_val(const gp_bank_t bank, const uint8_t pin, const _Bool value);
 
uint8_t gp_read_val(const gp_bank_t bank, const uint8_t pin);
 
void gp_set_af(const gp_bank_t bank, const uint8_t pin, const uint8_t af);
 
#endif /* GPIO_H */