STM32的输入功能=没用？？？

1万 · 2009-7-14 10:03

mega8的输出IO接STM32输入IO（GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //浮空输入  或 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入）

STM32的IO竞然吸入20MA的电流~~~

同事在搞一项目，mega8的功耗一直下不去，唯有我亲自操刀，一测，发现STM23的输入IO吸入了20MA的电流

声明，STM32的IO用作中断，配置如下：

    //外部中断管脚配置,中断输入
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //浮空输入
    GPIO_Init(GPIOB,&GPIO_InitStructure);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);

中断配置如下：

void SetInterrupt(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    /* Connect Key Button EXTI Line to Key Button GPIO Pin */
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);
    /* Enable the EXTI6 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /*Enable the EXTI Line6 Interrupt*/
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

}

另：

mega8 工作于5V ， STM32 工作于3.3V，

难道是灌电流，请问官方，有何解决？？？