Arduino for STM32

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#define LIBMAPPLE_CORE //comment it for HAL based core

#define IWDG_PR_DIV_4 0x0
#define IWDG_PR_DIV_8 0x1
#define IWDG_PR_DIV_16 0x2
#define IWDG_PR_DIV_32 0x3
#define IWDG_PR_DIV_64 0x4
#define IWDG_PR_DIV_128 0x5
#define IWDG_PR_DIV_256 0x6

typedef enum iwdg_prescaler {
  IWDG_PRE_4 = IWDG_PR_DIV_4,     /**< Divide by 4 */
  IWDG_PRE_8 = IWDG_PR_DIV_8,     /**< Divide by 8 */
  IWDG_PRE_16 = IWDG_PR_DIV_16,   /**< Divide by 16 */
  IWDG_PRE_32 = IWDG_PR_DIV_32,   /**< Divide by 32 */
  IWDG_PRE_64 = IWDG_PR_DIV_64,   /**< Divide by 64 */
  IWDG_PRE_128 = IWDG_PR_DIV_128, /**< Divide by 128 */
  IWDG_PRE_256 = IWDG_PR_DIV_256  /**< Divide by 256 */
} iwdg_prescaler;

#if defined(LIBMAPPLE_CORE)
typedef struct iwdg_reg_map {
  volatile uint32_t KR;  /**< Key register. */
  volatile uint32_t PR;  /**< Prescaler register. */
  volatile uint32_t RLR; /**< Reload register. */
  volatile uint32_t SR;  /**< Status register */
} iwdg_reg_map;

#define IWDG ((struct iwdg_reg_map *)0x40003000)
#endif

void iwdg_feed(void) { IWDG->KR = 0xAAAA; }

void iwdg_init(iwdg_prescaler prescaler, uint16_t reload) {
  IWDG->KR = 0x5555;
  IWDG->PR = prescaler;
  IWDG->RLR = reload;
  IWDG->KR = 0xCCCC;
  IWDG->KR = 0xAAAA;
}