基于stm32的数字频率计设计代码

只看该作者 · 2018-11-8 10:19

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

u32 CNT;
u32 fq;
u32 count=0;

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

TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值    计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_ITConfig(  //使能或者失能指定的TIM中断
TIM3, //TIM2
TIM_IT_Update  |  //TIM 中断源
TIM_IT_Trigger, //TIM 触发中断源
ENABLE  //使能
);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIMx外设

}

void TIM3_IRQHandler(void) //TIM3中断
{
   if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
   TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
LED1=!LED1;
CNT=TIM_GetCounter(TIM2);
   fq=CNT+65536*count;
   TIM_SetCounter(TIM2,0);
count=0;
}
}

u32 FanHui(void)
{
return fq;
}

void TIM2_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
     NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

   TIM_ITRxExternalClockConfig(TIM2,TIM_TS_ITR3);       //设置TIM2内部出发为外部时钟模式
TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted,0);//配置TIM2外部时钟模式2
TIM_SetCounter(TIM2,0);

NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  //TIM3中断
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
   NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

   TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

TIM_Cmd(TIM2,ENABLE);                               //使能TIM2

}

void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2,TIM_IT_Update) != RESET)
{
   TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
++count;
}
}

//定时器5通道1输入捕获配置

TIM_ICInitTypeDef  TIM5_ICInitStructure;

void TIM5_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIOA时钟

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;  //PA0 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);    //PA0 下拉

//初始化定时器5 TIM5
TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

//初始化TIM5输入捕获参数
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
  TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
  TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
  TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;    //配置输入分频,不分频
  TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
  TIM_ICInit(TIM5, &TIM5_ICInitStructure);

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

  TIM_Cmd(TIM5,ENABLE ); //使能定时器5

}

u8  TIM5CH1_CAPTURE_STA=0; //输入捕获状态
u16 TIM5CH1_CAPTURE_VAL; //输入捕获值

//定时器5中断服务程序
void TIM5_IRQHandler(void)
{

if((TIM5CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
{
if(TIM5CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM5CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM5CH1_CAPTURE_VAL=0XFFFF;
}else TIM5CH1_CAPTURE_STA++;
}
}

   if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
if(TIM5CH1_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM5CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获
}
else    //还未开始,第一次捕获上升沿
{
TIM5CH1_CAPTURE_STA=0; //清空
TIM5CH1_CAPTURE_VAL=0;
     TIM_SetCounter(TIM5,0);
TIM5CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
   TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}

  TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位

}