昆明网站服务,网站开发融资,西安网站设计试听,服务平台名称00. 目录 文章目录 00. 目录01. WDG概述02. 独立看门狗相关API2.1 IWDG_WriteAccessCmd2.2 IWDG_SetPrescaler2.3 IWDG_SetReload2.4 IWDG_ReloadCounter2.5 IWDG_Enable2.6 IWDG_GetFlagStatus2.7 RCC_GetFlagStatus 03. 独立看门狗接线图04. 独立看门狗程序示例105. 独立看门…00. 目录 文章目录 00. 目录01. WDG概述02. 独立看门狗相关API2.1 IWDG_WriteAccessCmd2.2 IWDG_SetPrescaler2.3 IWDG_SetReload2.4 IWDG_ReloadCounter2.5 IWDG_Enable2.6 IWDG_GetFlagStatus2.7 RCC_GetFlagStatus 03. 独立看门狗接线图04. 独立看门狗程序示例105. 独立看门狗程序示例206. 窗口看门狗相关API6.1 WWDG_DeInit6.2 WWDG_SetPrescaler6.3 WWDG_SetWindowValue6.4 WWDG_EnableIT6.5 WWDG_SetCounter6.6 WWDG_Enable6.7 WWDG_GetFlagStatus6.8 WWDG_ClearFlag 07. 窗口看门狗接线图08. 窗口看门狗程序示例09. 程序示例代码下载10. 附录 01. WDG概述 WDGWatchdog看门狗 看门狗可以监控程序的运行状态当程序因为设计漏洞、硬件故障、电磁干扰等原因出现卡死或跑飞现象时看门狗能及时复位程序避免程序陷入长时间的罢工状态保证系统的可靠性和安全性 看门狗本质上是一个定时器当指定时间范围内程序没有执行喂狗重置计数器操作时看门狗硬件电路就自动产生复位信号 STM32内置两个看门狗
独立看门狗IWDG独立工作对时间精度要求较低
窗口看门狗WWDG要求看门狗在精确计时窗口起作用
02. 独立看门狗相关API
2.1 IWDG_WriteAccessCmd
/*** brief Enables or disables write access to IWDG_PR and IWDG_RLR registers.* param IWDG_WriteAccess: new state of write access to IWDG_PR and IWDG_RLR registers.* This parameter can be one of the following values:* arg IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and IWDG_RLR registers* arg IWDG_WriteAccess_Disable: Disable write access to IWDG_PR and IWDG_RLR registers* retval None*/
void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
功能:使能或者失能对寄存器 IWDG_PR 和 IWDG_RLR 的写操作
参数:IWDG_WriteAccess对寄存器 IWDG_PR 和 IWDG_RLR 的写操作的新状态
返回值:无2.2 IWDG_SetPrescaler
/*** brief Sets IWDG Prescaler value.* param IWDG_Prescaler: specifies the IWDG Prescaler value.* This parameter can be one of the following values:* arg IWDG_Prescaler_4: IWDG prescaler set to 4* arg IWDG_Prescaler_8: IWDG prescaler set to 8* arg IWDG_Prescaler_16: IWDG prescaler set to 16* arg IWDG_Prescaler_32: IWDG prescaler set to 32* arg IWDG_Prescaler_64: IWDG prescaler set to 64* arg IWDG_Prescaler_128: IWDG prescaler set to 128* arg IWDG_Prescaler_256: IWDG prescaler set to 256* retval None*/
void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
功能:设置 IWDG 预分频值
参数:IWDG_PrescalerIWDG 预分频值
返回值:无
2.3 IWDG_SetReload
/*** brief Sets IWDG Reload value.* param Reload: specifies the IWDG Reload value.* This parameter must be a number between 0 and 0x0FFF.* retval None*/
void IWDG_SetReload(uint16_t Reload)
功能:设置 IWDG 重装载值
参数:IWDG_ReloadIWDG 重装载值
返回值:无
2.4 IWDG_ReloadCounter
/*** brief Reloads IWDG counter with value defined in the reload register* (write access to IWDG_PR and IWDG_RLR registers disabled).* param None* retval None*/
void IWDG_ReloadCounter(void)
功能:按照 IWDG 重装载寄存器的值重装载 IWDG 计数器
参数:无
返回值:无
2.5 IWDG_Enable
/*** brief Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).* param None* retval None*/
void IWDG_Enable(void)
功能:使能 IWDG
参数:无
返回值:无
2.6 IWDG_GetFlagStatus
/*** brief Checks whether the specified IWDG flag is set or not.* param IWDG_FLAG: specifies the flag to check.* This parameter can be one of the following values:* arg IWDG_FLAG_PVU: Prescaler Value Update on going* arg IWDG_FLAG_RVU: Reload Value Update on going* retval The new state of IWDG_FLAG (SET or RESET).*/
FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
功能:检查指定的 IWDG 标志位被设置与否
参数:IWDG_FLAG待检查的 I2C 标志位
返回值:IWDG_FLAG 的新状态SET 或者 RESET
2.7 RCC_GetFlagStatus
/*** brief Checks whether the specified RCC flag is set or not.* param RCC_FLAG: specifies the flag to check.* * For b STM32_Connectivity_line_devices, this parameter can be one of the* following values:* arg RCC_FLAG_HSIRDY: HSI oscillator clock ready* arg RCC_FLAG_HSERDY: HSE oscillator clock ready* arg RCC_FLAG_PLLRDY: PLL clock ready* arg RCC_FLAG_PLL2RDY: PLL2 clock ready * arg RCC_FLAG_PLL3RDY: PLL3 clock ready * arg RCC_FLAG_LSERDY: LSE oscillator clock ready* arg RCC_FLAG_LSIRDY: LSI oscillator clock ready* arg RCC_FLAG_PINRST: Pin reset* arg RCC_FLAG_PORRST: POR/PDR reset* arg RCC_FLAG_SFTRST: Software reset* arg RCC_FLAG_IWDGRST: Independent Watchdog reset* arg RCC_FLAG_WWDGRST: Window Watchdog reset* arg RCC_FLAG_LPWRRST: Low Power reset* * For b other_STM32_devices, this parameter can be one of the following values: * arg RCC_FLAG_HSIRDY: HSI oscillator clock ready* arg RCC_FLAG_HSERDY: HSE oscillator clock ready* arg RCC_FLAG_PLLRDY: PLL clock ready* arg RCC_FLAG_LSERDY: LSE oscillator clock ready* arg RCC_FLAG_LSIRDY: LSI oscillator clock ready* arg RCC_FLAG_PINRST: Pin reset* arg RCC_FLAG_PORRST: POR/PDR reset* arg RCC_FLAG_SFTRST: Software reset* arg RCC_FLAG_IWDGRST: Independent Watchdog reset* arg RCC_FLAG_WWDGRST: Window Watchdog reset* arg RCC_FLAG_LPWRRST: Low Power reset* * retval The new state of RCC_FLAG (SET or RESET).*/
FlagStatus RCC_GetFlagStatus(uint8_t RCC_FLAG)
功能:检查指定的 RCC 标志位设置与否
参数:RCC_FLAG待检查的 RCC 标志位
返回值:RCC_FLAG 的新状态SET 或者 RESET
03. 独立看门狗接线图 04. 独立看门狗程序示例1
main.c
#include stm32f10x.h#include delay.h
#include oled.hint main(void){ //初始化OLED_Init();OLED_ShowString(1, 1, IWDG TEST);if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) SET){OLED_ShowString(2, 1, IWDGRST);delay_ms(500);OLED_ShowString(2, 1, );delay_ms(100); RCC_ClearFlag();}else{OLED_ShowString(3, 1, RST);delay_ms(500);OLED_ShowString(3, 1, );delay_ms(100); }//写使能IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//设置预分频IWDG_SetPrescaler(IWDG_Prescaler_16);//设置重装载值 1000 1 / 40K * 16 * x x 2500IWDG_SetReload(2499);//喂狗IWDG_ReloadCounter();//看门狗使能IWDG_Enable();while(1){//喂狗IWDG_ReloadCounter();delay_ms(1800);}return 0;}05. 独立看门狗程序示例2
main.c
#include stm32f10x.h#include delay.h
#include oled.h
#include key.hint main(void){ //初始化OLED_Init();//按键初始化key_init();OLED_ShowString(1, 1, IWDG TEST);if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) SET){OLED_ShowString(2, 1, IWDGRST);delay_ms(500);OLED_ShowString(2, 1, );delay_ms(100); RCC_ClearFlag();}else{OLED_ShowString(3, 1, RST);delay_ms(500);OLED_ShowString(3, 1, );delay_ms(100); }//写使能IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//设置预分频IWDG_SetPrescaler(IWDG_Prescaler_16);//设置重装载值 1000 1 / 40K * 16 * x x 2500IWDG_SetReload(2499);//喂狗IWDG_ReloadCounter();//看门狗使能IWDG_Enable();while(1){key_scan();//喂狗IWDG_ReloadCounter();OLED_ShowString(4, 1, FEED);delay_ms(200);OLED_ShowString(4, 1, );delay_ms(600); }return 0;}
06. 窗口看门狗相关API
6.1 WWDG_DeInit
/*** brief Deinitializes the WWDG peripheral registers to their default reset values.* param None* retval None*/
void WWDG_DeInit(void)
功能:将外设 WWDG 寄存器重设为缺省值
参数:无
返回值:无
6.2 WWDG_SetPrescaler
/*** brief Sets the WWDG Prescaler.* param WWDG_Prescaler: specifies the WWDG Prescaler.* This parameter can be one of the following values:* arg WWDG_Prescaler_1: WWDG counter clock (PCLK1/4096)/1* arg WWDG_Prescaler_2: WWDG counter clock (PCLK1/4096)/2* arg WWDG_Prescaler_4: WWDG counter clock (PCLK1/4096)/4* arg WWDG_Prescaler_8: WWDG counter clock (PCLK1/4096)/8* retval None*/
void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
功能:设置 WWDG 预分频值值
参数:WWDG_Prescaler指定 WWDG 预分频
返回值:无
6.3 WWDG_SetWindowValue
/*** brief Sets the WWDG window value.* param WindowValue: specifies the window value to be compared to the downcounter.* This parameter value must be lower than 0x80.* retval None*/
void WWDG_SetWindowValue(uint8_t WindowValue)
功能:设置 WWDG 窗口值
参数:WindowValue r指定的窗口值。该参数取值必须在 0x40 与 0x7F 之间。
返回值:无
6.4 WWDG_EnableIT
/*** brief Enables the WWDG Early Wakeup interrupt(EWI).* param None* retval None*/
void WWDG_EnableIT(void)
功能:使能 WWDG 早期唤醒中断EWI
参数:无
返回值:无
6.5 WWDG_SetCounter
/*** brief Sets the WWDG counter value.* param Counter: specifies the watchdog counter value.* This parameter must be a number between 0x40 and 0x7F.* retval None*/
void WWDG_SetCounter(uint8_t Counter)
功能:设置 WWDG 计数器值
参数:Counter指定看门狗计数器值。该参数取值必须在 0x40 与 0x7F 之间。
返回值:无
6.6 WWDG_Enable
/*** brief Enables WWDG and load the counter value. * param Counter: specifies the watchdog counter value.* This parameter must be a number between 0x40 and 0x7F.* retval None*/
void WWDG_Enable(uint8_t Counter)
功能:使能 WWDG 并装入计数器值
参数:Counter指定看门狗计数器值。该参数取值必须在 0x40 与 0x7F 之间。
返回值:无
6.7 WWDG_GetFlagStatus
/*** brief Checks whether the Early Wakeup interrupt flag is set or not.* param None* retval The new state of the Early Wakeup interrupt flag (SET or RESET)*/
FlagStatus WWDG_GetFlagStatus(void)
功能:检查 WWDG 早期唤醒中断标志位被设置与否
参数:无
返回值:早期唤醒中断标志位的新状态SET 或者 RESET
6.8 WWDG_ClearFlag
/*** brief Clears Early Wakeup interrupt flag.* param None* retval None*/
void WWDG_ClearFlag(void)
功能:清除早期唤醒中断标志位
参数:无
返回值:无
07. 窗口看门狗接线图 08. 窗口看门狗程序示例
main.c
#include stm32f10x.h#include delay.h
#include oled.h
#include key.hint main(void){ //初始化OLED_Init();//按键初始化key_init();//开启WWDG时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);OLED_ShowString(1, 1, WWDG TEST);if (RCC_GetFlagStatus(RCC_FLAG_WWDGRST) SET){OLED_ShowString(2, 1, WWDGRST);delay_ms(500);OLED_ShowString(2, 1, );delay_ms(100); RCC_ClearFlag();}else{OLED_ShowString(3, 1, RST);delay_ms(500);OLED_ShowString(3, 1, );delay_ms(100); }//设置预分频WWDG_SetPrescaler(WWDG_Prescaler_8);//设置窗口值WWDG_SetWindowValue(21 | 0x40);//使能看门狗WWDG_Enable(0x40 | 54);while(1){key_scan();OLED_ShowString(4, 1, FEED);delay_ms(10);OLED_ShowString(4, 1, );delay_ms(10); //喂狗WWDG_SetCounter(0x40 | 54);}return 0;}09. 程序示例代码下载
38-独立看门狗.rar
39-窗口看门狗.rar
10. 附录
参考: 【STM32】江科大STM32学习笔记汇总
