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- 2018-8-14
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楼主 |
发表于 2018-8-23 18:24:06
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#include "exti.h"
#include "led.h"
#include "key.h"
#include "delay.h"
#include "usart.h"
u8 cnt=0;
u16 frequent;
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//¿aÆôGPIOoí1ü½Åê±Öó¸′óÃ
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //ía2¿ÖD¶Ï£¬Dèòaê1ÄüAFIOê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
//GPIOC.5 ÖD¶ÏÏßòÔ¼°ÖD¶Ï3õê¼»ˉÅäÖÃ
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource7);
EXTI_InitStructure.EXTI_Line=EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//ϽμÑØ′¥·¢
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOC,&GPIO_InitStructure);
}
void TIM_Init(u16 arr,u16 psc) {
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
TIM_TimeBaseInitStructure.TIM_ClockDivision=0;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period=0xffff;
TIM_TimeBaseInitStructure.TIM_Prescaler=0;
TIM_TimeBaseInit(TIM4 ,&TIM_TimeBaseInitStructure);
}
void TIM_IRQnHandler()
{
if(TIM_GetITStatus(TIM4,TIM_IT_Update)!=RESET)
{
cnt=TIM_GetCounter(TIM4);
frequent=cnt;
cnt=0;
}
}
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line7)==SET)
{
EXTI_ClearITPendingBit(EXTI_Line7);
if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_7)==Bit_RESET)
{
cnt=TIM_GetCounter(TIM4);
cnt++;
}
}
}
int main()
{
if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_7)==Bit_RESET)
{
printf("Frequent is %d",frequent);
}
}
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