关键代码extern uint8_t keyValue;，我来为大家科普一下关于stm32两个按键控制流水灯方向?以下内容希望对你有帮助!
stm32两个按键控制流水灯方向
关键代码
extern uint8_t keyValue;
void EXTIx_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource2);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource3);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource4);
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);
EXTI_InitStructure.EXTI_Line=EXTI_Line2|EXTI_Line3|EXTI_Line4;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x04;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI2_IRQHandler(void)
{
delay_ms(10);
if(KEY_R==0)
{
keyValue=KEY_R_PRESS;
}
EXTI_ClearITPendingBit(EXTI_Line2);
}
void EXTI3_IRQHandler(void)
{
delay_ms(10);
if(KEY_D==0)
{
keyValue=KEY_D_PRESS;
}
EXTI_ClearITPendingBit(EXTI_Line3);
}
void EXTI4_IRQHandler(void)
{
delay_ms(10);
if(KEY_L==0)
{
keyValue=KEY_L_PRESS;
}
EXTI_ClearITPendingBit(EXTI_Line4);
}
主函数：
uint8_t keyValue=0;
LED_WorkModeTypeDef myLEDWorkMode=LED_MODE1;
int main(void)
{
delay_init(168);
LED_Init();
Key_Init();
EXTIx_Init();
while(1)
{
switch(keyValue)
{
case KEY_L_PRESS:
myLEDWorkMode=LED_MODE1;
break;
case KEY_D_PRESS:
myLEDWorkMode=LED_MODE2;
break;
case KEY_R_PRESS:
myLEDWorkMode=LED_MODE3;
break;
default:
break;
}
if(myLEDWorkMode==LED_MODE1)
{
LED_Mode1(1000);
}
else if(myLEDWorkMode==LED_MODE2)
{
LED_Mode2();
}
else if(myLEDWorkMode==LED_MODE3)
{
LED_Mode3();
}
}
}
,
