STM32

待机唤醒程序如何退出待机模式？程序好像没写退出待机模式啊。

2019-07-20 16:15发布

站内问答 / STM32/STM8
2184 6 1455
原子的待机唤醒例程里面哪里表示退出待机模式啊，中断处理EXTI0_IRQnHandler那里吗？那不是显示进入待机模式吗？

void Sys_Enter_Standby(void)
{ 

  RCC_AHB1PeriphResetCmd(0X01FF,ENABLE); 

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

PWR_ClearFlag(PWR_FLAG_WU);

  PWR_WakeUpPinCmd(ENABLE);

PWR_EnterSTANDBYMode();//???????ú????
 
}

u8 Check_WKUP(void) 
{
u8 t=0;
u8 tx=0;
LED0=0; 
while(1)
{
if(WKUP_KD)
{
t++;
tx=0;
}else 
{
tx++;
if(tx>3)
{
LED0=1;
return 0;
}
}
delay_ms(30);
if(t>=100)
{
LED0=0; 
return 1; 
}
}
}  


void EXTI0_IRQHandler(void)
{                
  EXTI_ClearITPendingBit(EXTI_Line0);
if(Check_WKUP())
{  
Sys_Enter_Standby(); 
}
} 


void WKUP_Init(void)
{  
  GPIO_InitTypeDef  GPIO_InitStructure;
NVIC_InitTypeDef   NVIC_InitStructure;
EXTI_InitTypeDef   EXTI_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; 
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; 
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
   
  if(Check_WKUP()==0)
{
Sys_Enter_Standby();
}
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
 
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; 
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);


NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

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前进的小兵
2019-07-20 18:00
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