STM32学习笔记（十五）- 库函数 定时器定时中断 OLED显示中断

1.复制文件

链接：https://pan.baidu.com/s/1EzsuQJsNGrgCzg7-fo8v4A?pwd=f2mu 
提取码：f2mu

2.相关知识

1.初始化定时器的大致思路

1.这里用定时中断，所以开启RCC内部时钟

2.选择时基单元的时钟源

3.配置时基单元

4.配置输出中断控制，允许更新中断输出到NVIC

5.配置NVIC，在NVIC中打开定时器中断的通道，并分配一个优先级

6.运行控制，更新计数器

2.相关函数

在timer.h文件中

//恢复缺省配置
void TIM_DeInit(TIM_TypeDef* TIMx);

//时基单元初始化
void TIM_TimeBaseInit(TIM_TypeDef* TIMx, TIM_TimeBaseInitTypeDef*TIM_TimeBaseInitStruct);

//把结构体参数赋一个默认值
void TIM_TimeBaseStructInit(TIM_TimeBaseInitTypeDef* TIM_TimeBaseInitStruct);

//使能计数器
void TIM_Cmd(TIM_TypeDef* TIMx, FunctionalState NewState);

//使能中断输出信号
void TIM_ITConfig(TIM_TypeDef* TIMx, uint16_t TIM_IT, FunctionalState NewState);


//时基单元的时钟选择部分 时钟源
void TIM_InternalClockConfig(TIM_TypeDef* TIMx);    //选择内部时钟

void TIM_ITRxExternalClockConfig(TIM_TypeDef* TIMx, uint16_t TIM_InputTriggerSource);    

void TIM_TIxExternalClockConfig(TIM_TypeDef* TIMx, uint16_t TIM_TIxExternalCLKSource, uint16_t TIM_ICPolarity, uint16_t ICFilter);

void TIM_ETRClockMode1Config(TIM_TypeDef* TIMx, uint16_t TIM_ExtTRGPrescaler, uint16_t TIM_ExtTRGPolarity,uint16_t ExtTRGFilter);    //外部时钟模式1

void TIM_ETRClockMode2Config(TIM_TypeDef* TIMx, uint16_t TIM_ExtTRGPrescaler, 
uint16_t TIM_ExtTRGPolarity, uint16_t ExtTRGFilter);    //外部时钟模式2

//单独配置ETR引脚的预分频器，极性，滤波器
void TIM_ETRConfig(TIM_TypeDef* TIMx, uint16_t TIM_ExtTRGPrescaler, uint16_t TIM_ExtTRGPolarity,uint16_t ExtTRGFilter);

//预分频值
void TIM_PrescalerConfig(TIM_TypeDef* TIMx, uint16_t Prescaler, uint16_t TIM_PSCReloadMode);

//改变计数器的计数模式
void TIM_CounterModeConfig(TIM_TypeDef* TIMx, uint16_t TIM_CounterMode);

//自动重装器预分频功能配置
void TIM_ARRPreloadConfig(TIM_TypeDef* TIMx, FunctionalState NewState);

//给计数器写入一个值
void TIM_SetCounter(TIM_TypeDef* TIMx, uint16_t Counter);

//给自动重装器写入一个值
void TIM_SetAutoreload(TIM_TypeDef* TIMx, uint16_t Autoreload);

//获取当前计数器的值
uint16_t TIM_GetCounter(TIM_TypeDef* TIMx);

//获取当前的预分频器的值
uint16_t TIM_GetPrescaler(TIM_TypeDef* TIMx);

//获取标志位和清除标志位
FlagStatus TIM_GetFlagStatus(TIM_TypeDef* TIMx, uint16_t TIM_FLAG);

void TIM_ClearFlag(TIM_TypeDef* TIMx, uint16_t TIM_FLAG);

ITStatus TIM_GetITStatus(TIM_TypeDef* TIMx, uint16_t TIM_IT);

void TIM_ClearITPendingBit(TIM_TypeDef* TIMx, uint16_t TIM_IT);

2.工程

1.在System新建Timer.c和Timer.h文件

2.代码部分

Timer.c

#include "stm32f10x.h"                  // Device header

//定时器初始化
void Timer_Init(void)
{
	//开启时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	//选择时钟源
	TIM_InternalClockConfig(TIM2);
	
	//配置时基单元
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;	//选择分频
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 10000 - 1;		//ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1;	
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	//清除标志位，避免刚初始化就进入中断
	TIM_ClearFlag(TIM2, TIM_FLAG_Update);
	
	//配置输出中断控制
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
	
	//配置NVIC
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStructure);
	
	//运动控制
	TIM_Cmd(TIM2, ENABLE);
}

/*void TIM2_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
	{
		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
	}
}*/

Timer.h

#ifndef _TIMER_H
#define _TIMER_H

void Timer_Init(void);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Timer.h"

uint16_t NUM;

int main(void)
{
	OLED_Init();
	Timer_Init();
	
	OLED_ShowString(1, 1, "NUM:");
	OLED_ShowString(2, 1, "CNT:");
	
	while(1)
	{
		OLED_ShowNum(1, 5, NUM, 5);
		OLED_ShowNum(2, 5, TIM_GetCounter(TIM2), 5);
	}
}

void TIM2_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
	{
		NUM++;
		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
	}
}