基于STM32库函数编写的键盘扫描程序，根据键值触发相应的事件。
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//按键端口初始化
void Key_Init(void){
GPIO_InitTypeDef GPIO_InitStructure;
//开启按键端口（PA）的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
//扫描按键
int Key_Scan(void)
{
int Down_Value=0;
/*检测是否有按键按下*/
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_8) == 0 )
{
delay_ms(20);
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_8) == 0 )
{
if(k1_shortpress_happen==0)
{
k1_shortpress_happen = 1;
key1_shortpress_Flag = 1;
key1_timing=0;
}
if(k1_shortpress_happen==1)
{
if(key1_timing > 3000)
{
Down_Value = 2; //长按生效标志位
k1_shortpress_happen = 0;
k1_LongPress_Flag=1;
}
}
}
}
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_8)==1)
{
key1_shortpress_Flag = 0;
if(k1_shortpress_happen==1)
{
k1_shortpress_happen = 0;
if(k1_doublepress_happen==0)
{
k1_doublepress_happen = 1;
key1_doublepress_Flag=1;
key1_doublepress_timing = 0;
}
else
{
if(key1_doublepress_timing < 300)
{
k1_doublepress_happen = 0;
Down_Value = 0; //短按生效标志位
}
}
}
else if(k1_doublepress_happen == 1)
{
if(key1_doublepress_timing > 300)
{
if(k1_LongPress_Flag==1)
{
k1_LongPress_Flag=0;
}
else
{
Down_Value = 1; //双击生效标志位
}
k1_doublepress_happen = 0;
key1_doublepress_Flag = 0;
}
}
else if(k1_longpress_happen==1)
{
k1_longpress_happen = 0;
}
}
}
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