STM32 最簡單的邊沿觸發脈衝計數程序

 

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
#include "lcd.h"


extern u8 sign;
extern u16 TIM5CH1_CAPTURE_COUNT;
 int main(void)
 {		 
	delay_init();	    	 //延時函數初始化	  
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 	 //設置NVIC中斷分組2:2位搶佔優先級，2位響應優先級
	uart_init(115200);	 //串口初始化爲115200
 	LED_Init();			     //LED端口初始化
	LCD_Init();			   	    //初始化LCD 	
	KEY_Init();         	//初始化與按鍵連接的硬件接口
  TIM3_Int_Init(4999,7199);	 //72000000/(4999+1)(7199+1)=2Hz----500ms
  TIM5_Int_Init(4999,7199);	 //

	 
	 
	 while(1)
	 {
		 TIM_SetCompare2(TIM3,2500);		   
	     LCD_ShowNum(10,80,TIM5CH1_CAPTURE_COUNT,24,16);
		 LCD_ShowNum(10,120,sign,24,16);
	 }

 }

#include "timer.h"
#include "led.h"
#include "usart.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //時鐘使能

	TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器週期的值	 計數到5000爲500ms
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作爲TIMx時鐘頻率除數的預分頻值  10Khz的計數頻率  
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上計數模式
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
 
	TIM_ITConfig(  //使能或者失能指定的TIM中斷
		TIM3, //TIM2
		TIM_IT_Update  |  //TIM 中斷源
		TIM_IT_Trigger,   //TIM 觸發中斷源 
		ENABLE  //使能
		);
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中斷
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先佔優先級0級
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //從優先級3級
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
	NVIC_Init(&NVIC_InitStructure);  //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器

	TIM_Cmd(TIM3, ENABLE);  //使能TIMx外設
							 
}




void TIM5_Int_Init(u16 arr,u16 psc)
{	  
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  	TIM_ICInitTypeDef TIM5_ICInitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //tim5時鐘使能
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //pa端口使能
	
	

	TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器週期的值	
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作爲TIMx時鐘頻率除數的預分頻值
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置時鐘分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上計數模式
	TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //根據指定的參數初始化TIMx的時間基數單位
	

	TIM5_ICInitStructure.TIM_Channel=TIM_Channel_1;//通道1----CH1----pa0
	TIM5_ICInitStructure.TIM_ICFilter=0x00;//不濾波
	TIM5_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising;//上升沿檢測
	TIM5_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;
	TIM_ICInit(TIM5,&TIM5_ICInitStructure);
	
	TIM_ITConfig(TIM5,TIM_IT_CC1,ENABLE);//允許更新中斷和捕獲中斷
	

	//中斷分組初始化
	NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;  //TIM5中斷
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先佔優先級2級
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //從優先級0級
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
	NVIC_Init(&NVIC_InitStructure);  //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器 
	
	TIM_Cmd(TIM5, ENABLE);  //使能TIMx					 
}

u16 TIM5CH1_CAPTURE_COUNT=0;//輸入捕捉數

//定時器5中斷服務程序
void TIM5_IRQHandler(void)   //TIM3中斷
{
	if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)  //檢查TIM5更新中斷髮生與否
		{
	    TIM5CH1_CAPTURE_COUNT++;
			LED1=!LED1;
		}
		 TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中斷標誌位
}


u8 sign=0;
//定時器3中斷服務程序
void TIM3_IRQHandler(void)   //TIM3中斷
{
	if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //檢查TIM3更新中斷髮生與否
		{
			if(sign++==10)
			{
					TIM5CH1_CAPTURE_COUNT=0;
                    sign=0;				
			}
		}
			TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx的中斷待處理位:TIM 中斷源 
}