/**
* @brief Initialize the watchdog timer for a specified timeout
*
* It is important to note that this function returns the achieved timeout
* for this hardware. For hardware independence this should be checked when
* scheduling updates. Other hardware dependent details may need to be
* considered such as a window time which sets a minimum update time,
* and this function should return a recommended delay for clearing.
*
* For the STM32 nominal clock rate is 32 khz, but for the maximum clock rate of
* 60 khz and a prescaler of 4 yields a clock rate of 15 khz. The delay that is
* set in the watchdog assumes the nominal clock rate, but the delay for FreeRTOS
* to use is 75% of the minimal delay.
*
* @returns Maximum recommended delay between updates based on PIOS_WATCHDOG_TIMEOUT constant
*/
uint16_t PIOS_WDG_Init()
{
uint16_t delay = ((uint32_t) PIOS_WATCHDOG_TIMEOUT * 60) / 16;
if (delay > 0x0fff)
delay = 0x0fff;
#if defined(PIOS_INCLUDE_WDG)
DBGMCU_Config(DBGMCU_IWDG_STOP, ENABLE); // make the watchdog stop counting in debug mode
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_16);
IWDG_SetReload(delay);
IWDG_ReloadCounter();
IWDG_Enable();
// watchdog flags now stored in backup registers
PWR_BackupAccessCmd(ENABLE);
wdg_configuration.bootup_flags = RTC_ReadBackupRegister(PIOS_WDG_REGISTER);
/*
* Start from an empty set of registered flags so previous boots
* can't influence the current one
*/
RTC_WriteBackupRegister(PIOS_WDG_REGISTER, 0);
#endif
return delay;
}
/******************************************************************************
* @brief 看门狗初始化
* @param tm：看门狗时间，0.5s / 1s / 2s / 3s /默认最长3.542秒
* @retval None
******************************************************************************/
void WDT_Init(TYPE_WDTtime tm)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); //关闭IWDG_PR和IWDG_RLR 的写保护
if(tm == WDT_S5)IWDG_SetReload(578); //设置重装载值
else if(tm == WDT_1S)IWDG_SetReload(1158);
else if(tm == WDT_2S)IWDG_SetReload(2315);
else if(tm == WDT_3S)IWDG_SetReload(3473);
else IWDG_SetReload(0xFFF);
IWDG_SetPrescaler(IWDG_Prescaler_32); //设置预分频系数为32
//IWDG_ReloadCounter();
IWDG_Enable(); //使能看门狗
}
void InitWatchdog(void){
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_4);
IWDG_SetReload(0xFFF);
IWDG_Enable();
}
int LCDPANELProcessInit(void)
{
rt_thread_t init_thread;
rt_err_t result = RT_EOK;
// 创建消息队列，分配队列存储空间
result = rt_mq_init(&rx_mq, "mqt", &msg_pool[0], 32 - sizeof(void*), sizeof(msg_pool), RT_IPC_FLAG_FIFO);
if (result != RT_EOK)
{
rt_kprintf("init message queue failed.\n");
return result;
}
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); // Enable write access to IWDG_PR and IWDG_RLR registers
IWDG_SetPrescaler(IWDG_Prescaler_32); // IWDG counter clock: 40KHz(LSI) / 32 = 1.25 KHz
IWDG_SetReload(1250); // Set counter reload value to 1250
IWDG_ReloadCounter(); // Reload IWDG counter
// IWDG_Enable(); // Enable IWDG (the LSI oscillator will be enabled by hardware)
init_thread = rt_thread_create( "lcdpanel",
LCDPANELProcess_thread_entry,
RT_NULL,
2048,10,10);
if( init_thread != RT_NULL )
{
rt_thread_startup(init_thread);
}
return 0;
}
void PhotonWdgs::begin(bool _enableWwdg,bool _enableIwdg,unsigned long _timeout, TIMid id)
{
if(!_enableWwdg && !_enableIwdg) {
// nothing to do ...
return;
}
PhotonWdgs::_aliveCount = 0;
PhotonWdgs::_timeoutval = _timeout / 10;
RCC_LSICmd(ENABLE); //LSI is needed for Watchdogs
PhotonWdgs::_wdgTimer.begin(PhotonWdgs::_tickleWDGs, 20, hmSec, id);
// OTA updates won't work with watchdog enabled
System.disableUpdates();
PhotonWdgs::_wwdgRunning = _enableWwdg;
if(_enableWwdg) {
RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
WWDG_SetPrescaler(WWDG_Prescaler_8);
WWDG_SetWindowValue(0x7F);
WWDG_Enable(0x7F);
}
PhotonWdgs::_iwdgRunning = _enableIwdg;
if(_enableIwdg) {
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_256);
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetReload(0xFFF);
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_Enable();
}
}
OSStatus PlatformWDGInitialize( uint32_t timeout_ms )
{
plat_log_trace();
OSStatus err = kNoErr;
// PLATFORM_TO_DO
/* Get the LSI frequency: TIM5 is used to measure the LSI frequency */
LsiFreq = GetLSIFrequency();
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: LSI/32 */
IWDG_SetPrescaler(IWDG_Prescaler_128);
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/32)
= 0.25s / (LsiFreq/32)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
IWDG_SetReload((uint16_t)(LsiFreq*timeout_ms/128000));
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
return err;
}
void WatchDogInit(void)
{
/* IWDG timeout equal to 250 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: LSI/32 */
/* prescaler min/ms max/ms
4 0.1 409.6
8 0.2 819.2
16 0.4 1638.4
32 0.8 3276.8
64 1.6 6553.5
128 3.2 13107.2
256 6.4 26214.4
*/
IWDG_SetPrescaler(IWDG_Prescaler_16);
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/32)
= 0.25s / (LsiFreq/32)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
IWDG_SetReload(0X4AAA);//(LsiFreq/128);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
/**
* @brief iwdg config
*/
void IWDG_Configuration(void)
{
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: LSI/32 */
IWDG_SetPrescaler(IWDG_Prescaler_32);
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/32)
= 0.25s / (LsiFreq/32)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
// IWDG_SetReload(LSI_FREQ / 128);
// iwdg period is 1000mS
IWDG_SetReload(LSI_FREQ / 32);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
/**
* Initializes the boards watchdog timer. If the behavior of the board is changed, this method may need to be
* modified if the main control loop is changed.
*
* @param none
* @retval none
*/
void Watchdog_Init(void) {
/* Get the LSI frequency from TIM5 */
LsiFreq = GetLSIFrequency();
printf("LSI Frequency: %" PRIu32 "\n", LsiFreq);
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: LSI/32 */
IWDG_SetPrescaler(IWDG_Prescaler_64);
/* Set counter reload value to obtain 1s IWDG TimeOut.
IWDG counter clock Frequency = LsiFreq/32
Counter Reload Value = 250ms/IWDG counter clock period
= 0.25s / (32/LsiFreq)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
IWDG_SetReload(LsiFreq/16);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
//==============================================================================
// 看門狗設定 : 用來當RESET 用
//==============================================================================
void IWDG_Config(unsigned char timeout)
{
/* IWDG timeout equal to 250 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: LSI/32 */
//IWDG_SetPrescaler(IWDG_Prescaler_32);
/* IWDG counter clock: LSI/256 */
IWDG_SetPrescaler(IWDG_Prescaler_256);
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/32)
= 0.25s / (LsiFreq/32)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
// IWDG_SetReload(LsiFreq/128);
IWDG_SetReload(timeout);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
SysTick_Config(SystemCoreClock/10);
// Enable the LSI OSC
RCC_LSICmd(ENABLE);
// Wait till LSI is ready
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {};
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
// IWDG counter clock: LSI/256
IWDG_SetPrescaler(IWDG_Prescaler_256);
IWDG_SetReload(0x0FFF);
// Reload IWDG counter
IWDG_ReloadCounter();
// Enable IWDG (the LSI oscillator will be enabled by hardware)
IWDG_Enable();
// Write memmory
FLASH_UnlockBank1();
FLASH_ErasePage(FLAG_ADDR);
FLASH_ProgramWord(FLAG_ADDR,(u32)FLAG_UPDATED);
FLASH_LockBank1();
updateFW_control();
}
void WDT_init(void)
{
IWDG_WriteAccessEnable();
IWDG_SetPrescaler(IWDG_Prescaler_256);
IWDG_SetReload(0xFFF);
IWDG_Enable();
IWDG_ReloadCounter();
}
void watchdog_config(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetReload(0x80);
IWDG_SetPrescaler(IWDG_Prescaler_32);
IWDG_Enable();
tim13_config();
}
//*******************初始化独立看门狗*************************************
//函数定义: void IWDG_Configuration(void)
//描 述：初始化独立看门狗
//入口参数：无
//出口参数：无
//备 注：分频因子=4*2^prer.但最大值只能是256!时间计算(大概):Tout=40K/((4*2^prer)*rlr)值 2S超时
//Editor：liuqh 2013-1-16 Company: BXXJS
//*******************************************************************
static void IWDG_Configuration(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//使能对IWDG->PR和IWDG->RLR的写
IWDG_SetPrescaler(IWDG_Prescaler_64);//64分频
IWDG_SetReload(1300);
IWDG_ReloadCounter();
IWDG_Enable();
}
/**
* IWDG_Configuration
*/
static void IWDG_Configuration(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_64);
IWDG_SetReload(1875);
IWDG_ReloadCounter();
IWDG_Enable();
}
void IWDG_Init()
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_256);
IWDG_SetReload(781);
IWDG_ReloadCounter();
IWDG_Enable();
}
/*******************************************************************************
函 数 名：void IWDG_Init(void)
功能描述：看门狗初始化
入口参数：
返回参数：
创建时间: 2011.6.24
********************************************************************************/
void IWDG_Init(void)
{
IWDG_WriteAccessCmd( IWDG_WriteAccess_Enable );
IWDG_SetPrescaler( IWDG_Prescaler_64); //最小
IWDG_SetReload( 0x138); //40KHz内部时钟 (1/40000 * 64 * 0x138 = 0.5s)
IWDG_WriteAccessCmd( IWDG_WriteAccess_Disable );
IWDG_Enable();
IWDG_ReloadCounter();
}
void IWDG_Init(void)
{
//konfigurowanie watchdoga IWDG
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); // Zezwolenie na zapis rejestrów IWDG
IWDG_SetPrescaler(IWDG_Prescaler_64); // IWDG taktowany zegarem: 37kHz/64 = 0.578kHz
IWDG_SetReload(0xFFF); // Przepelnienie IWDG po okolo 7s
IWDG_ReloadCounter(); // Przeladowanie IWDG
IWDG_Enable(); // Wlaczenie IWDG i LSI
}
/**
* @brief 初始化独立看门狗
* @param prer : IWDG预分频值 , rlr 重装载值
* @retval None
*/
void IWDG_Init(u8 prer, u16 rlr)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); //使能对寄存器IWDG_PR和IWDG_RLR的写操作
IWDG_SetPrescaler(prer); //设置IWDG预分频值:设置IWDG预分频值为64
IWDG_SetReload(rlr); //设置IWDG重装载值
IWDG_ReloadCounter(); //按照IWDG重装载寄存器的值重装载IWDG计数器
IWDG_Enable(); //使能IWDG
IWDG_Feed();
}
/*******************************************************************************
* Function Name : IWDG_Configuration
* Description : ?/AA?·AaOA
* Input : None
* Output : None
* Return : None
* Attention : None
*******************************************************************************/
void IWDG_Configuration(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); /* ?/Ee0x5555,OAOUOE?i?·?·?A/????/Ee?¦AU */
IWDG_SetPrescaler(IWDG_Prescaler_256); /* AU²?µIEUE±OO256·O?µ 40K/256=156HZ(6.4ms) */
/* ?/AA?·¶¨E±??Oc³oE±?a */
IWDG_SetReload(781); /* I??·E±?a 5s/6.4MS=781 .??Oa²»AU/oOU0xfff*/
IWDG_ReloadCounter(); /* I??·*/
IWDG_Enable(); /* E?AU?/AA?·*/
}
/*!
* @brief
* @note
LSI clock between 30 and 60kHz
WDTimeOut = 75 ms
Prescaler = 64
Tlsi = 1 / (LSI / prescaler) = 1 / (60kHz / 64) = 0.001067
ReloadValue = WDTimeOut / Tlsi = 75ms / 0.001067 = 70
this equals the minimum WDG-timeout!
max. timeout occurs when LSI is @30 kHz (minimum): 2 * 75 ms = 150 ms
*/
void WatchDogInit( void )
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler( IWDG_Prescaler_64 );
IWDG_SetReload(70);// max value 4095 (0xFFF)
IWDG_Enable();
IWDG_ReloadCounter();
}
void Watchdog_init(int t) {
#ifdef __PFM6__
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_32);
IWDG_SetReload(t);
while(IWDG_GetFlagStatus(IWDG_FLAG_RVU) == RESET);
IWDG_ReloadCounter();
IWDG_Enable();
IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
#endif
}
/*******************************************************************************
* Function Name : stm32_WdgInit
* Description : ƬÄÚ¶ÀÁ¢¿´ÃŹ·ÅäÖÃ
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void arch_WdgInit()
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: 30-60KHz(LSI) / 64 = 469-937.5Hz */
IWDG_SetPrescaler(IWDG_Prescaler_64);
/* Set counter reload value to 1800 */
IWDG_SetReload(1800);
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
int main(void)
{
//RCC_ClocksTypeDef Clocks;
uint8_t pos = 128+64;
SystemInit();
SystemCoreClockUpdate(); //update the system clock variable
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_Init(GPIOA, &GPIOA_InitStruct);
timercounter = 0;
//set systick to 1 every 1uS
SysTick_Config(SystemCoreClock/8);
initUSART1();
GPIO_SetBits(GPIOA, GPIO_Pin_10);
//initialize the watchdog
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(0x00);
//while(IWDG_GetFlagStatus(IWDG_FLAG_PVU)==SET);
IWDG_SetReload(0xFFFF);
//while(IWDG_GetFlagStatus(IWDG_FLAG_RVU)==SET);
//IWDG_SetWindowValue(0x0000);
//while(IWDG_GetFlagStatus(IWDG_FLAG_PVU)==SET);
IWDG_ReloadCounter();
IWDG_Enable();
static BitAction toggle = Bit_SET;
int i =0;
//init the u8g library
u8g_InitComFn(&u8g, &u8g_dev_ssd1306_128x64_i2c, u8g_com_hw_i2c_fn);
u8g_SetDefaultForegroundColor(&u8g);
while(1){
u8g_FirstPage(&u8g);
do
{
IWDG_ReloadCounter();
draw(pos);
} while ( u8g_NextPage(&u8g) );
/* refresh screen after some delay */
///* update position */
if(pos < 128+128){
pos--;
}else
{ pos = 128+128;
}
}
}
void driv_wdg_init(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//启动寄存器读写
IWDG_SetPrescaler(IWDG_Prescaler_256);//40K时钟256分频
IWDG_SetReload(0xfff); //计数器数值，大概26秒
//IWDG_ReloadCounter(); //重启计数器
//IWDG_Enable(); //启动看门狗
}
/*
*********************************************************************************************************
* 函 数 名: bsp_InitIwdg
* 功能说明: 独立看门狗时间配置函数
* 形 参：IWDGTime: 0 ---- 0x0FFF
* 独立看门狗时间设置,单位为ms,IWDGTime = 1000 大约就是一秒的
* 时间，这里没有结合TIM5测得实际LSI频率，只是为了操作方便取了
* 一个估计值超过IWDGTime不进行喂狗的话系统将会复位。
* LSI = 34000左右
* 返 回 值: 无
*********************************************************************************************************
*/
void bsp_iwdg_init(unsigned int IWDGTime)
{
/* 检测系统是否从独立看门狗复位中恢复 */
if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
{
/* 清除复位标志 */
RCC_ClearFlag();
}
else
{
/* 标志没有设置 */
}
#if 1
/* 通过TIM5输入捕获得到LSI频率 */
LsiFreq = GetLSIFrequency();
#else
/* 使能LSI */
RCC_LSICmd(ENABLE);
/* 等待直到LSI就绪 */
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
{}
/* */
LsiFreq = 32000;
#endif
/* 写入0x5555表示允许访问IWDG_PR 和IWDG_RLR寄存器 */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* LSI/32 分频*/
IWDG_SetPrescaler(IWDG_Prescaler_256);
/*特别注意，由于这里_ulIWDGTime的最小单位是ms, 所以这里重装计数的
计数时 需要除以1000
Counter Reload Value = (IWDGTime / 1000) /(1 / IWDG counter clock period)
= (IWDGTime / 1000) / (32/LSI)
= (IWDGTime / 1000) / (32/LsiFreq)
= LsiFreq * IWDGTime / 32000
实际测试LsiFreq = 34000，所以这里取1的时候 大概就是1ms
*/
IWDG_SetReload(IWDGTime);
/* 重载IWDG计数 */
IWDG_ReloadCounter();
/* 使能 IWDG (LSI oscillator 由硬件使能) */
IWDG_Enable();
}
/************************************************
* 函 数: IWDG_Init(u8, u16)
* 功 能: 初始化独立看门狗, 预分频数 = 4*2^prescaler, 最大256;
* 看门狗复位大概时间: time_out = (4*2^prescaler)*reload/40(ms)
*
* 参 数: prescaler - 分频因子(0~7), 仅低3位有效
* reload - 重装载寄存器值, 低11位有效
*
* 返回值: 无, 调用示例: IWDG_Init(4, 62); // 独立看门狗, 预分频数64，重装载值62，溢出时间约为100ms
*************************************************/
void IWDG_Init(u8 prescaler, u16 reload)
{
// 使能对寄存器IWDG_PR和IWDG_RLR的写操作
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
// 设置IWDG预分频数
IWDG_SetPrescaler(prescaler);
// 设置IWDG重新装载值
IWDG_SetReload(reload);
// 根据IWDG重新装载寄存器值重新装载IWDG计数器
IWDG_ReloadCounter();
// 使能IWDG
IWDG_Enable();
} // IWDG_Init()
void IWDG_Config(void)
{
//0x5555,Enable IWDG
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
//40k/256=156kHz(6.4ms)
IWDG_SetPrescaler(IWDG_Prescaler_256);
//5s/6.4ms = 781, Max = 0xFFF
IWDG_SetReload( RELOAD_TIM_MS(1000) );
//Feed the Watch Dog
IWDG_ReloadCounter();
//Enable Watch Dog
IWDG_Enable();
}
/*******************************************************************************
* IWDG配置(独立看门狗)
* 看门狗的溢出时间：T=（（4×2^Prer）×RLR）/40
* 看门狗的溢出时间:T=1s，Prer=4(分频)分频因子为64 重载值RLR=625
*******************************************************************************/
void IWDG_Init(void)
{
//对IWDG_PR和IWDG_RLR寄存器的写访问被使能
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
//设置预分频因子为64
IWDG_SetPrescaler(IWDG_Prescaler_64);
//设定重载值为625
IWDG_SetReload(625);
//喂狗
IWDG_ReloadCounter();
//使能IWDG
IWDG_Enable();
}
void IwdgConfig()
{
RCC_LSICmd(ENABLE); //打开LSI
while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY)==RESET);
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
IWDG_SetPrescaler(IWDG_Prescaler_32);
IWDG_SetReload(4000); //80ms ,max 0xFFF 0~4095
IWDG_ReloadCounter();
IWDG_Enable();
}