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/*
* Copyright (c) 2016 Open-RnD Sp. z o.o.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef _STM32_IWDG_H_
#define _STM32_IWDG_H_
#include <stdint.h>
/**
* @brief Driver for Independent Watchdog (IWDG) for STM32 MCUs
*
* Based on reference manual:
* STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx
* advanced ARM ® -based 32-bit MCUs
*
* Chapter 19: Independent watchdog (IWDG)
*
*/
/* counter reload trigger */
#define STM32_IWDG_KR_RELOAD 0xaaaa
/* magic value for unlocking write access to PR and RLR */
#define STM32_IWDG_KR_UNLOCK 0x5555
/* watchdog start */
#define STM32_IWDG_KR_START 0xcccc
/* 19.4.1 IWDG_KR */
union __iwdg_kr {
uint32_t val;
struct {
uint16_t key;
uint16_t rsvd;
} bit;
};
/* 19.4.2 IWDG_PR */
union __iwdg_pr {
uint32_t val;
struct {
uint32_t pr :3 __packed;
uint32_t rsvd__3_31 :29 __packed;
} bit;
};
/* 19.4.3 IWDG_RLR */
union __iwdg_rlr {
uint32_t val;
struct {
uint32_t rl :12 __packed;
uint32_t rsvd__12_31 :20 __packed;
} bit;
};
/* 19.4.4 IWDG_SR */
union __iwdg_sr {
uint32_t val;
struct {
uint32_t pvu :1 __packed;
uint32_t rvu :1 __packed;
uint32_t rsvd__2_31 :30 __packed;
} bit;
};
/* 19.4.5 IWDG register map */
struct iwdg_stm32 {
union __iwdg_kr kr;
union __iwdg_pr pr;
union __iwdg_rlr rlr;
union __iwdg_sr sr;
};
#endif /* _STM32_IWDG_H_ */