记录高级定时器TIM1的配置过程
学习计数模式
通过蜂鸣器鸣叫展示代码
有源蜂鸣器：内部自带震荡体，通电就响
无源蜂鸣器：需要输出PWM
之前Delay初始化的时候，晶振被8分频了，变成9MHz的频率了吗，why？
为啥要先分频呢？小声BB……
给蜂鸣器新建一个Beep.c和Beep.h
Beep.c
#include "Beep.h"void Beep_Init(void){RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF, ENABLE);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//推挽输出GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;GPIO_Init(GPIOF, &GPIO_InitStructure);GPIO_SetBits(GPIOF, GPIO_Pin_0);//置高，蜂鸣器不响}void TIM_UserConfig (uint16_t Period, uint16_t Prescaler){RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);TIM_TimeBaseInitTypeDef TIM_InitStructure;TIM_InitStructure.TIM_Period = Period;TIM_InitStructure.TIM_Prescaler = Prescaler;TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//不分割时钟TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数TIM_InitStructure.TIM_RepetitionCounter = 0;//重复计数次数，就是计数溢出即申请中断TIM_TimeBaseInit(TIM1, &TIM_InitStructure);//初始化定时器TIM_ClearITPendingBit(TIM1, TIM_IT_Update);//清除 TIM1 的中断待处理位，先清除，再开启中断TIM_ITConfig(TIM1, TIM_IT_Update | TIM_IT_Trigger, ENABLE);//开启计数器中断（定时器1，计数|触发中断源，使能）TIM_Cmd(TIM1, ENABLE);//使能计数器NVIC_InitTypeDef NVIC_InitStructure;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//设置中断分组0，主优先级0，抢占优先级3NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;//中断入口NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;NVIC_Init(&NVIC_InitStructure);}void TIM1_UP_IRQHandler(void){//获取中断状态if( TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET )//只要不等于0，就代表进来中断了{GPIO_WriteBit(GPIOF, GPIO_Pin_0, (BitAction)(!GPIO_ReadOutputDataBit(GPIOF, GPIO_Pin_0)));//进入中断，先把这个TIM_IT_Update清零TIM_ClearITPendingBit(TIM1, TIM_IT_Update);}}
Beep.h
#ifndef __BEEP_H__#define __BEEP_H__#include "stm32f10x.h" // Device headervoid Beep_Init(void);void TIM_UserConfig (uint16_t Period, uint16_t Prescaler);#endif
main.c
#include "stm32f10x.h" // Device header#include "Delay.h"#include "LED.h"#include "Beep.h"int main(void){Delay_Init(72);LED_Init();Beep_Init();TIM_UserConfig (1000-1, 7200-1);/* 72M如果7200分频，7200 0000 /7200 = 10000，就是1s计数100001ms计数10个 100us计数1个写1000，就是计数100ms */while(1){}}
蜂鸣器模块接在GPIOF的PIN0上，100ms电平反转一次，0.2s一个周期，鸣叫一次，50%的占空比
这里可以用逻辑分析仪抓取一下PF0引脚的波形……
