09_TIM输入捕获

TIM输入捕获

输入捕获简介

频率测量

输入捕获通道

主从触发模式

输入捕获基本结构

PWMI基本结构

输入捕获模式测频率

接线图

引脚选择

代码

IC.c

#include "stm32f10x.h"                  // Device header

void IC_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); //使能时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	
	//直接使用PA0接口对应TIM2_CH1_ETR
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
	
	TIM_InternalClockConfig(TIM3); //配置内部时钟
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1; //时钟分频
	TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up; //向上计数
	TIM_TimeBaseInitStruct.TIM_Period=65536-1; //自动重装器 ARR
	TIM_TimeBaseInitStruct.TIM_Prescaler=72-1; //预分频器 PSC
	TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStruct); //配置时基单元
	
	TIM_ICInitTypeDef TIM_ICInitStruct;
	TIM_ICInitStruct.TIM_Channel=TIM_Channel_1;
	TIM_ICInitStruct.TIM_ICFilter=0xF;
	TIM_ICInitStruct.TIM_ICPolarity=TIM_ICPolarity_Rising; //上升沿触发
	TIM_ICInitStruct.TIM_ICPrescaler=TIM_ICPSC_DIV1;
	TIM_ICInitStruct.TIM_ICSelection=TIM_ICSelection_DirectTI; //直连通道
	TIM_ICInit(TIM3,&TIM_ICInitStruct); //输入捕获初始化
	
	TIM_SelectInputTrigger(TIM3,TIM_TS_TI1FP1); //触发源选择
	
	TIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset); //从模式选择
	
	TIM_Cmd(TIM3,ENABLE); //启动定时器
}

uint32_t IC_GetFreq(void)
{
	return 1000000/(TIM_GetCapture1(TIM3)+1); //Freq=Fc/N
}

IC.h

#ifndef __IC_H__
#define __IC_H__

void IC_Init(void);
uint32_t IC_GetFreq(void);

#endif

PWM.c

#include "stm32f10x.h"                  // Device header

void PWM_Init(void)
{
	//产生一个频率为1KHz,占空比为50%,分辨率为1%的PWM波形
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //使能时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	
	//直接使用PA0接口对应TIM2_CH1_ETR
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP; //复用推挽输出
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
	
	//使用重定义功能将PA15映射给TIM2_CH1_ETR
//	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //开启AFIO
//	GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2,ENABLE); //引脚重映射配置 PA0->PA15
//	GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE); //JTAG-DP Disabled and SW-DP Enabled,让PA15解除JTDI,变为正常的GPIO口
//	GPIO_InitTypeDef GPIO_InitStruct;
//	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP; //复用推挽输出
//	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_15;
//	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
//	GPIO_Init(GPIOA,&GPIO_InitStruct);
	
	TIM_InternalClockConfig(TIM2); //配置内部时钟
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1; //时钟分频
	TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up; //向上计数
	TIM_TimeBaseInitStruct.TIM_Period=100-1; //自动重装器 ARR
	TIM_TimeBaseInitStruct.TIM_Prescaler=720-1; //预分频器 PSC
	TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;
	TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStruct); //配置时基单元
	
	TIM_OCInitTypeDef TIM_OCInitStruct;
	TIM_OCStructInit(&TIM_OCInitStruct); //给结构体默认初始值
	TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1; //输出比较模式:PWM1
	TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High; //输出比较极性:高电平
	TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable; //输出使能
	TIM_OCInitStruct.TIM_Pulse=0; //捕获比较寄存器 CCR
	TIM_OC1Init(TIM2,&TIM_OCInitStruct); //TIM2的OC1通道初始化
	
	TIM_Cmd(TIM2,ENABLE); //启动定时器
}

/**
  * @brief 设置CCR的值(占空比)
  * @param Compare: uint16_t
  * @retval void
  */
void PWM_SetCompare1(uint16_t Compare)
{
	TIM_SetCompare1(TIM2,Compare);
}

void PWM_SetPrescaler(uint16_t Prescaler)
{
	TIM_PrescalerConfig(TIM2,Prescaler,TIM_PSCReloadMode_Immediate);
}

PWM.h

#ifndef __PWM_H__
#define __PWM_H__

void PWM_Init(void);
void PWM_SetCompare1(uint16_t Compare);
void PWM_SetPrescaler(uint16_t Prescaler);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "PWM.h"
#include "IC.h"

uint8_t i;

int main(void)
{
	OLED_Init();
	PWM_Init();
	IC_Init();
	PWM_SetPrescaler(720-1); //频率Freq=72M/(PSC+1)/100
	PWM_SetCompare1(50); //Duty=CCR/100
	OLED_ShowString(1,1,"Freq:00000Hz");
	while(1)
	{
		OLED_ShowNum(1,6,IC_GetFreq(),5);
	}
}

PWMI模式测频率占空比

IC.c

#include "stm32f10x.h"                  // Device header

void IC_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); //使能时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	
	//直接使用PA0接口对应TIM2_CH1_ETR
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
	
	TIM_InternalClockConfig(TIM3); //配置内部时钟
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1; //时钟分频
	TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up; //向上计数
	TIM_TimeBaseInitStruct.TIM_Period=65536-1; //自动重装器 ARR
	TIM_TimeBaseInitStruct.TIM_Prescaler=72-1; //预分频器 PSC
	TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStruct); //配置时基单元
	
	TIM_ICInitTypeDef TIM_ICInitStruct;
	TIM_ICInitStruct.TIM_Channel=TIM_Channel_1;
	TIM_ICInitStruct.TIM_ICFilter=0xF;
	TIM_ICInitStruct.TIM_ICPolarity=TIM_ICPolarity_Rising; //上升沿触发
	TIM_ICInitStruct.TIM_ICPrescaler=TIM_ICPSC_DIV1;
	TIM_ICInitStruct.TIM_ICSelection=TIM_ICSelection_DirectTI; //直连通道
	TIM_PWMIConfig(TIM3,&TIM_ICInitStruct); //自动配置两个输入捕获初始化,输入一个结构体就行,另一个结构体自动相反配置
	
	TIM_SelectInputTrigger(TIM3,TIM_TS_TI1FP1); //触发源选择
	
	TIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset); //从模式选择
	
	TIM_Cmd(TIM3,ENABLE); //启动定时器
}

uint32_t IC_GetFreq(void)
{
	return 1000000/(TIM_GetCapture1(TIM3)+1); //Freq=Fc/N
}

uint32_t IC_GetDuty(void)
{
	return (TIM_GetCapture2(TIM3)+1)*100/(TIM_GetCapture1(TIM3)+1);
}

IC.h

#ifndef __IC_H__
#define __IC_H__

void IC_Init(void);
uint32_t IC_GetFreq(void);
uint32_t IC_GetDuty(void);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "PWM.h"
#include "IC.h"

uint8_t i;

int main(void)
{
	OLED_Init();
	PWM_Init();
	IC_Init();
	PWM_SetPrescaler(720-1); //频率Freq=72M/(PSC+1)/100
	PWM_SetCompare1(80); //Duty=CCR/100
	OLED_ShowString(1,1,"Freq:00000Hz");
	OLED_ShowString(2,1,"Duty:000%");
	while(1)
	{
		OLED_ShowNum(1,6,IC_GetFreq(),5);
		OLED_ShowNum(2,6,IC_GetDuty(),3);
	}
}