在单片机中,中断是一个非常重要的内容,几乎在每一块的内容中都可能会用到中断,换句话说,只要是某个寄存器在一定条件作用下可以置一个标志位,那么这个标志位就可以作为触发中断的条件,在ADC,USART等中,中断甚至可能会影响程序的功能,下面就是我所学习的关于STM32中中断以及外部中断的知识。
以及我所写的对射式红外传感器计次的程序。
#include "stm32f10x.h" // Device header
#include "OLED.h"
#include "CountSensor.h"
int main(void)
{
OLED_Init();
CountSensor_Init();
OLED_ShowString(1,1,"NUM:");
CountSensorGetNum();
while (1)
{
OLED_ShowNum(1,5,CountSensorGetNum(),6);
}
}
#include "stm32f10x.h" // Device header
uint16_t CountSensorNUM=0;
void CountSensor_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_14;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource14);
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line=EXTI_Line14;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_InitStructure);
}
uint16_t CountSensorGetNum(void)
{
return CountSensorNUM;
}
void EXTI15_10_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line14)==SET)
{
CountSensorNUM++;
EXTI_ClearITPendingBit(EXTI_Line14);
}
}
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