在做STM32F051C8的睡眠测试时发现一个问题，请大家指点下
问题描述：
单片机可以进入睡眠，也能被外部中断唤醒，唤醒后程序也接着往下运行，但是程序不能下载了，需要再次按一下复位按键才能下载
这是什么原因，要怎么排除？请大家指点
主程序
[mw_shl_code=c,true]#include "stm32f0xx.h"
#include "delay.h"
#include "led.h"
#include "lpm.h"
void Delay(uint32_t t)
{
while(t--)
{
;
}
}
int main(void)
{
uint8_t i;
Delay_Init(48);
LED_Init();
LED_Open(0); //启动标志
//延时10秒
for(i=0; i<10; i++)
{
Delay_ms(1000);
}
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
LED_Close(0); //进入模式标志
Delay_ms(500);
SleepMode_Measure();
LED_Init();
while(1)
{
for(i=0; i<4; i++)
{
LED_Not(i);
Delay(0x8FFFF);
}
}
}[/mw_shl_code]
睡眠函数程序
[mw_shl_code=c,true]void Ekey_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Enable and set EXTI0 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Connect EXTI0 Line to PA0 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource3);
/* Configure EXTI0 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line3;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
void SleepMode_Measure(void)
{
__IO uint32_t index = 0;
GPIO_InitTypeDef GPIO_InitStructure;
//开启所有的时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC, ENABLE);
//对所有的IO进行设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_Init(GPIOC, &GPIO_InitStructure);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC, DISABLE);
//使能外部中断使其可以唤醒MCU
Ekey_Init();
//进入睡眠模式
__WFI();
}
[/mw_shl_code]
中断程序
[mw_shl_code=c,true]void EXTI2_3_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line3) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line3);
}
}[/mw_shl_code]
请大家指点，谢谢 | 
/2 
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发表于 2014-11-17 11:21:59
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