基于f407标准库实现待机唤醒实现,引脚是PA0
时间: 2024-02-21 22:59:37 浏览: 24
好的,针对你的问题,我可以给出以下基于F407标准库实现待机唤醒的方法:
1. 首先需要开启PA0引脚的外部中断,在main函数中添加如下代码:
```
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_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_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_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 = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
```
2. 在main函数中添加以下代码,进入待机模式:
```
PWR_EnterSTANDBYMode();
```
3. 在中断处理函数 EXTI0_IRQHandler 中添加以下代码,唤醒系统:
```
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line0);
PWR_BackupAccessCmd(ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, DISABLE);
PWR_BackupAccessCmd(DISABLE);
}
```
这样,当PA0引脚检测到上升沿时,系统会进入待机模式,并在PA0引脚检测到下降沿时唤醒系统。
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