已编辑完成 .. 我将重建代码,但现在已经完成并经过测试
我需要实现一个计时器,每 x 秒检查一次条件..我面临的问题是程序进入无限循环时不会重置(离开以检查系统是否已停止)...
这些链接帮助了我.. 手册第 74 页http://www2.st.com/content/ccc/resource/technical/document/reference_manual/3d/6d/5a/66/b4/99/40/d4/DM00031020.pdf/files/ DM00031020.pdf/jcr:content/translations/en.DM00031020.pdf ..
这个链接http://www.programmershare.com/3518407/ 在此先感谢
我目前有这个代码:
#include "stm32f4xx.h"
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_wwdg.h>
void setup_Periph(void);
void Delay(unsigned long ms);
void Delay(unsigned long ms)
{ unsigned long i,j;
for(i=0;i<ms;i++)
for(j=0;j<1450;j++);
}
void setup_Periph(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
//port initialization
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_Init(GPIOD,&GPIO_InitStructure);
}
void ResetWatchdog(void)
{ WWDG_SetCounter(80);}
void WWDG_IRQHandler(void)
{
if (WWDG_GetFlagStatus())
{
WWDG_SetCounter(0x7f);
WWDG_ClearFlag();
}
}
void FeedDog(float round)
{
while(round)
{ Delay (65);
WWDG_SetCounter(127);
round--;}
}
int main(void)
{
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
//System Clock auf Watchdog
RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
WWDG_SetPrescaler(WWDG_Prescaler_8);
//WWDG clock counter = (PCLK1(30MHz)/4096)/1 = 7324 Hz (~137 us)
WWDG_SetCounter(80); //Werte 0x40 und 0x7F
WWDG_SetWindowValue(80); //0x80
//Reset < 120 > 64
WWDG_Enable(127); //WWDG timeout = ~137 us * (127-64) = 8.6ms
WWDG_ClearFlag();
WWDG_EnableIT();
setup_Periph();
//make sure the clk is stable
RCC_HSEConfig(RCC_HSE_ON);
while(!RCC_WaitForHSEStartUp());
GPIO_SetBits(GPIOD, GPIO_Pin_1);
Delay(10000); //10 ms
GPIO_ResetBits(GPIOD, GPIO_Pin_1);
Delay(10000); //100 ms
while (1)
{
GPIO_SetBits(GPIOD, GPIO_Pin_0);
Delay(10000); //10 ms
GPIO_ResetBits(GPIOD, GPIO_Pin_0);
Delay(10000); //100 ms
void ResetWatchdog(void);
WWDG_SetCounter(80);
FeedDog(8);
for(;;) {}
}
}