53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
#include "wdg.h"
|
||
/*****************************************************************************
|
||
* Function : Iwdg_Init
|
||
* Description : none
|
||
* Input : u8 timeout 为以秒为单位的看门狗超时时间，不得低于1s,看门狗定时器的数据不能超过u16的大小65536
|
||
* Output : None
|
||
* Return :
|
||
* Others :
|
||
* Record
|
||
* 1.Date : 20170412
|
||
* Author : barry
|
||
* Modification: Created function
|
||
|
||
*****************************************************************************/
|
||
void Iwdg_Init(u8 timeout)
|
||
{
|
||
#define WDG_PRE 256
|
||
#define WDG_PER_COUNT (40000/WDG_PRE)
|
||
#define IWDG_Prescaler IWDG_Prescaler_256
|
||
|
||
|
||
u8 max_timeout = 0xFFF / WDG_PER_COUNT;
|
||
|
||
u16 reloadCount = 0;
|
||
|
||
timeout = (timeout == 0)? 1:timeout;
|
||
timeout = (timeout >= max_timeout)? max_timeout: timeout;
|
||
|
||
reloadCount = timeout* WDG_PER_COUNT;
|
||
|
||
/* Check if the system has resumed from IWDG reset */
|
||
if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
|
||
{
|
||
RCC_ClearFlag();
|
||
}
|
||
|
||
/* IWDG timeout equal to 280 ms (the timeout may varies due to LSI frequency
|
||
dispersion) */
|
||
/* Enable write access to IWDG_PR and IWDG_RLR registers */
|
||
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
|
||
|
||
/* IWDG counter clock: 40KHz(LSI) / 32 = 1.25 KHz */
|
||
IWDG_SetPrescaler(IWDG_Prescaler);
|
||
|
||
/* Set counter reload value to 1250, 1s timeout */
|
||
IWDG_SetReload(reloadCount);
|
||
|
||
/* Reload IWDG counter */
|
||
IWDG_ReloadCounter();
|
||
|
||
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
|
||
IWDG_Enable();
|
||
} |