STM32定时器中断实验

ID:297022 · 发表于 2018-3-26 00:00

mian函数

#include "stm32f10x.h"
#include "usart.h"
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "timer.h"
#include "key.h"
#include "timer.h"
#define up 1
#define down 0

int main(void)
{
u8  key = 0;
u8  key1 = 0;
u8  num0 = 0;
u8  num1 = 0;
u8  num2 = 0;
u8  speed = 1;
u16 arrLowest = 189;
u16  arrMax= 409;
u16 arr =299;
u16 psc = 359;
LED_Init();
delay_init();
KEY_Init();
DJ_Init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200); //串口初始化为115200
TIM3_Int_Init(arr,psc);//10Khz的计数频率，计数到100为10ms （arr+1）*（psc+1）/72
while(1)
{
      key = KEY_Scan(0);
      if(key == KEY0_PRES)
      {
         if(num0 == 0)
         {
            num0 = 1;
            LED1=0;
            GPIO_ResetBits(GPIOB,GPIO_Pin_6);
         }
         else
         {
            num0 = 0;
            LED1=1;
            GPIO_SetBits(GPIOB,GPIO_Pin_6);
         }
      }
      if(key == KEY1_PRES)
      {
         if(num2 == 0)
         {
            GPIO_SetBits(GPIOG,GPIO_Pin_9);
            num2 = 1;
         }
         else
         {
            GPIO_ResetBits(GPIOG,GPIO_Pin_9);
            num2 = 0;
         }
      }
      while(key == WKUP_PRES)
      {
         if(speed == down)
         {
            arr+=2;
            TIM3_Int_Init(arr,psc);
            delay_ms(50);
            key1 = KEY_Scan(0);
            if(arr > arrMax)
            {
                  speed = up;
            }
            if(key1 == WKUP_PRES)//关闭变速
            {
                  LED1 = 0;
                  key = 0;
            }
         }
         if(speed == up)
         {
            arr-=2;
            TIM3_Int_Init(arr,psc);
            delay_ms(50);
            if(arr < arrLowest)
            {
                  speed = down;
            }
            key1 = KEY_Scan(0);
            if(key1 == WKUP_PRES)
            {
                  LED1 = 0;
                  key = 0;
            }
         }
      }
}
}

#include "timer.h"
#include "led.h"
void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
//定时器TIM3初始化
TIM_TimeBaseStructure.TIM_Period = arr;//自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler = psc;//预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //使能指定的TIM3中断,允许更新中断
//中断优先级NVIC设置
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;//TIM3中断
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//响应优先级
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM3,ENABLE);//使能TIMx
}
void TIM3_IRQHandler(void)//TIM3中断函数
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update) != RESET)//检查TIM3更新中断发生与否
{
      TIM_ClearITPendingBit(TIM3,TIM_IT_Update);//清除TIMx更新中断标志
      LED0=!LED0;
}
}

void DJ_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);//使能GPIOB
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG,ENABLE);//使能GPIOG
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;//推挽输出
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_4;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStruct);
GPIO_SetBits(GPIOB,GPIO_Pin_6);
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;//推挽输出
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOG,&GPIO_InitStruct);
GPIO_SetBits(GPIOG,GPIO_Pin_9);
}

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