一、前言
分享2024第一篇文章，总用到各种定时器，普通定时器都还简单一些，将普通定时器使用其他功能后使用高级定时器1去做定时功能反而遇到一些小问题，这里分享出来，在扩展记录一下pwm使用。
二、环境
stm32f103vxxx
kiel5
三、正文
话不多说，上代码
#include "timer.h"
#include "usart.h"
long ticket1,ticket2,ticket3,ticket4;
long number1,number2,number3,number4;
unsigned int onesecond=0;
unsigned int modeflag=0;
//外部中断0服务程序
void EXTIX_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);//使能PORTA,PORTE时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //设置输入,外部有上拉，无需在上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIOE2,3,4
//GPIOC.0 中断线以及中断初始化配置 下降沿触发
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource0);
EXTI_InitStructure.EXTI_Line=EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
//GPIOC.1 中断线以及中断初始化配置 下降沿触发
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource1);
EXTI_InitStructure.EXTI_Line=EXTI_Line1;
EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
//GPIOC.2 中断线以及中断初始化配置 下降沿触发
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource2);
EXTI_InitStructure.EXTI_Line=EXTI_Line2;
EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
//GPIOC.3 中断线以及中断初始化配置 下降沿触发
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource3);
EXTI_InitStructure.EXTI_Line=EXTI_Line3;
EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
EXTIX_NVIC_Init(DISABLE);
}
//是否开启外部引脚中断
//0:DISABLE 1:ENABLE;
void EXTIX_NVIC_Init(FunctionalState status)
{
NVIC_InitTypeDef NVIC_InitStructure;
//NVIC
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //使能按键WK_UP所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01; //抢占优先级2，
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = status;//0:DISABLE 1:ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; //使能按键KEY2所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01; //抢占优先级2，
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; //子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = status;//0:DISABLE 1:ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn; //使能按键KEY2所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01; //抢占优先级2，
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; //子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = status;//0:DISABLE 1:ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn; //使能按键KEY2所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01; //抢占优先级2，
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; //子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = status;//0:DISABLE 1:ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure);
ticket1=0;
ticket2=0;
ticket3=0;
ticket4=0;
}
//外部中断0服务程序
void EXTI0_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志位
number1++;
}
//外部中断2服务程序
void EXTI1_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line1); //清除LINE1上的中断标志位
number2++;
}
//外部中断3服务程序
void EXTI2_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line2); //清除LINE2上的中断标志位
number3++;
}
//外部中断4服务程序
void EXTI3_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line3); //清除LINE3上的中断标志位
number4++;
}
//通用定时器1中断初始化
//arr：自动重装值。
//psc：时钟预分频数
//这里使用的是定时器1
void TIM1_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //时钟使能
//定时器TIM3初始化
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
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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_TimeBaseStructure.TIM_RepetitionCounter = 0;//加上这句，否则定时器1不好使，很慢
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //使能指定的TIM1中断,允许更新中断
//中断优先级NVIC设置
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器
TIM_Cmd(TIM1, ENABLE); //使能TIMx
}
//定时器1中断服务程序
unsigned int ledflag=0;
void TIM1_UP_IRQHandler(void) //TIM3中断
{
if(TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查TIM1更新中断发生与否
{
//定时标志
ledflag++;
//串口接收等待
if(g_Uart1_Timer>0)//如果开始接收，进行计数判断超时
g_Uart1_Timer++;
if(g_Uart2_Timer>0)//如果开始接收，进行计数判断超时
g_Uart2_Timer++;
//pwm采集
onesecond++;
if(onesecond>200){
onesecond=0;
modeflag++;
if(modeflag>4)
modeflag=0;
if(modeflag==0)EXTIX_NVIC_Init(ENABLE);
else if(modeflag==2)EXTIX_NVIC_Init(DISABLE);
ticket1=number1;
number1=0;
ticket2=number2;
number2=0;
ticket3=number3;
number3=0;
ticket4=number4;
number4=0;
}
TIM_ClearITPendingBit(TIM1, TIM_IT_Update ); //清除TIMx更新中断标志
}
}
void TIM2_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能定时器2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
//GPIO_PinRemapConfig(GPIO_Remap_TIM2, ENABLE); //Timer2部分重映射
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //TIM2_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
//初始化TIM2
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
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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(TIM2, &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TIM2 Channel 2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse = 0;//初始状态占空比为0
TIM_OC2Init(TIM2, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM2 OC2
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR2上的预装载寄存器
TIM_Cmd(TIM2, ENABLE); //使能TIM2
}
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
//GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM3_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
//初始化TIM3
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
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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
//初始化TIM3 Channel 2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse = 0;//初始状态占空比为0
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIM3
}
void TIM4_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //使能定时器4时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
//GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer4部分重映射
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM4_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
//初始化TIM4
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
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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(TIM4, &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TIM4 Channel 1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse = 0;//初始状态占空比为0
TIM_OC1Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM4 OC2
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM4在CCR2上的预装载寄存器
TIM_Cmd(TIM4, ENABLE); //使能TIM4
}
void TIM5_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能定时器5时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
//GPIO_PinRemapConfig(GPIO_Remap_TIM5, ENABLE); //Timer5部分重映射
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //TIM5_CH1 TIM5_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
//初始化TIM5
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
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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(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 Channel 1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_Pulse = 0;//初始状态占空比为0
TIM_OC1Init(TIM5, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM5 OC2
TIM_OC1PreloadConfig(TIM5, TIM_OCPreload_Enable); //使能TIM5在CCR2上的预装载寄存器
TIM_Cmd(TIM5, ENABLE); //使能TIM5
}
//TIM5 CH1--1
//TIM2 CH2--2
//TIM3 CH2--3
//TIM4 CH1--4
//只能设置0~100K频率，一个定时器设置一种频率
void Signal_0_100K(char num,int freq)
{
long arr,psc;
if(freq==0){
arr=0;psc=71;
}
else if(freq>=1&&freq<=1000){
arr=10000/freq;psc=7199;
}
else if(freq>1000&&freq<=100000){
arr=1000000/freq;psc=71;
}
else{
arr=0;psc=71;
}
if(num==1){//设置PMW1
TIM_DeInit(TIM5);
TIM_SetCounter(TIM5,0);
TIM5_PWM_Init(arr-1,psc);
TIM_SetCompare1(TIM5,arr/2);
}
else if(num==2){//设置PMW2
TIM_DeInit(TIM2);
TIM_SetCounter(TIM2,0);
TIM2_PWM_Init(arr-1,psc);
TIM_SetCompare2(TIM2,arr/2);
}
else if(num==3){//设置PMW3
TIM_DeInit(TIM3);
TIM_SetCounter(TIM3,0);
TIM3_PWM_Init(arr-1,psc);
TIM_SetCompare1(TIM3,arr/2);
}
else if(num==4){//设置PMW4
TIM_DeInit(TIM4);
TIM_SetCounter(TIM4,0);
TIM4_PWM_Init(arr-1,psc);
TIM_SetCompare3(TIM4,arr/2);
}
}
#ifndef __TIMER_H
#define __TIMER_H
#include "sys.h"
extern long ticket1,ticket2,ticket3,ticket4;
extern unsigned int ledflag;
extern unsigned int modeflag;
void EXTIX_Init(void);//外部中断初始化
void EXTIX_NVIC_Init(FunctionalState status);
void TIM1_Int_Init(u16 arr,u16 psc);
void TIM2_PWM_Init(u16 arr,u16 psc);
void TIM3_PWM_Init(u16 arr,u16 psc);
void TIM4_PWM_Init(u16 arr,u16 psc);
void TIM5_PWM_Init(u16 arr,u16 psc);
void Signal_0_100K(char num,int freq);
#endif
main.c
TIM1_Int_Init(49,7199);//10Khz的计数频率，计数到50为5ms
EXTIX_Init();//初始化外部终端计数采集频率
Signal_0_100K(1,0);//PWM输出0
Signal_0_100K(2,0);//PWM输出0
Signal_0_100K(3,0);//PWM输出0
Signal_0_100K(4,0);//PWM输出0
四、结语
定时器1使用定时功能要有TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
