53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
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/*******************************************************************************
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**
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**文 件 名:bsp_wdog.c
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**创建日期:2015.10.15
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**文件说明:
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**修改记录:
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**版 本:V1.0
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**备 注:
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*******************************************************************************/
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#include <stddef.h>
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#include "drv_wdog.h"
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#include "kit_debug.h"
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#include "stm32f4xx.h"
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#include "bsp_malloc.h"
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#define KR_KEY_Reload ((uint16_t)0xAAAA)
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#define KR_KEY_Enable ((uint16_t)0xCCCC)
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#define IWDG_Prescaler_64 ((uint8_t)0x04)
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#define IWDG_WriteAccess_Enable ((uint16_t)0x5555)
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#define IWDG_WriteAccess_Disable ((uint16_t)0x0000)
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/*****************************************************************************
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* 初始化独立看门狗
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* prer:分频数:0~7(只有低 3 位有效!)
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* 分频因子=4*2^prer.但最大值只能是 256!
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* rlr:重装载寄存器值:低 11 位有效.
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* 时间计算(大概):Tout=((4*2^prer)*rlr)/40 (ms).
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******************************************************************************/
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/* KR register bit mask */
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//每个tick时间 1000/(40000/64) = 1.6s
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void drv_wdog_init(uint16_t idog_tick)
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{
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//使能对IWDG->PR和IWDG->RLR的写
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IWDG->KR = IWDG_WriteAccess_Enable;
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//40kHz/64= 625Hz
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IWDG->PR = IWDG_Prescaler_64;
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if(idog_tick > 4095)
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idog_tick = 4095;
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IWDG->RLR = idog_tick;
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//必须reload 否则时间不对
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IWDG->KR = KR_KEY_Reload;
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IWDG->KR = KR_KEY_Enable;
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IWDG->KR = IWDG_WriteAccess_Disable;
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}
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void drv_wdog_feed(void)
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{
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IWDG->KR = KR_KEY_Reload;
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}
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