这里使用STM32F407型号，其它版本可能略有区别
定时器同步可以用来BLDC的HALL、ENCODER、内部时钟相位一致
定时器同步触发：
主定时器配置：
1、TIM_SelectOutputTrigger(TIM_TypeDef* TIMx, uint16_t TIM_TRGOSource);
TIMx：根据数据手册决定，看表76/72，这里我们选择TIM4
?
TIM_TRGOSource：输出触发源选项
TIM_TRGOSource_Reset??
TIM_TRGOSource_Enable?
TIM_TRGOSource_Update?
TIM_TRGOSource_OC1????
TIM_TRGOSource_OC1Ref?
TIM_TRGOSource_OC2Ref?
TIM_TRGOSource_OC3Ref?
TIM_TRGOSource_OC4Ref?
有8个选项，TIM_TRGOSource_OC1～TIM_TRGOSource_OC4Ref是OC输出，这里实验时采用PWM，可以的没问题；这里我们实验选择TIM_TRGOSource_OC1Ref
TIM_TRGOSource_Enable这一项也验证了，可以触发；
至于TIM_TRGOSource_Reset和TIM_TRGOSource_Update? 这两项未能成功验证，反复试了很多方法，还是不行，现象：一上电，就触发了，根本不能控制
具体见手册，如下图
2、void TIM_SelectMasterSlaveMode(TIM_TypeDef* TIMx, uint16_t TIM_MasterSlaveMode);
TIMx：和上面保持一致
TIM_MasterSlaveMode：2个选项
TIM_MasterSlaveMode_Enable?
TIM_MasterSlaveMode_Disable
这里使用TIM_MasterSlaveMode_Enable? 使能主从模式
从定时器配置：
void TIM_SelectInputTrigger(TIM_TypeDef* TIMx, uint16_t TIM_InputTriggerSource);
TIMx：参照表格76/72来确定，这里选择TIM5实验
TIM_InputTriggerSource：
TIM_TS_ITR0??
TIM_TS_ITR1??
TIM_TS_ITR2??
TIM_TS_ITR3??
TIM_TS_TI1F_ED
TIM_TS_TI1FP1
TIM_TS_TI2FP2
TIM_TS_ETRF??
选择输入触发源，TIM_TS_ITR0～ TIM_TS_ITR3是表格76/72来确定的，和主定时器保持一致，这里我们选择TIM_TS_ITR2（即触发源是定时器4）
TIM_TS_TI1F_ED：一般用来bldc霍尔输入来触发的
TIM_TS_TI1FP1 ：
TIM_TS_TI2FP2：这2个检测 编码器信号输入触发的
TIM_TS_ETRF：外部触发
这些验证没有问题
具体参数意义见手册，如下图
void TIM_SelectSlaveMode(TIM_TypeDef* TIMx, uint16_t TIM_SlaveMode);
TIMx：上同
TIM_SlaveMode：
TIM_SlaveMode_Reset??? ：复位
TIM_SlaveMode_Gated???? ：门控
TIM_SlaveMode_Trigger?? ：触发
TIM_SlaveMode_External1? ：外部
从定时器模式选择，这里反复实验验证TIM_SlaveMode_Gated、 TIM_SlaveMode_External1
没有问题
至于TIM_SlaveMode_Reset只对TI1有效，即定时器输入1通道和TIM_SlaveMode_Trigger只对TI2有效，即定时器输入2通道，都是适用于外部信号触发，比如hall，编码器，按键；见下图
?
详细见手册，如下图
详细见手册，如下图
下面示意2种同步代码
代码1：触发输出采用TIM_TRGOSource_Enable?
触发输入采用TIM_SlaveMode_Gated
//从定时器
void ????? Tim5_init(void)
{
?????? TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStre;
?????? NVIC_InitTypeDef NVIC_InitStre;
??????
?????? RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
?????? TIM_ITConfig(TIM5,TIM_IT_Update,DISABLE);
?????? TIM_Cmd(TIM5, DISABLE);
??????
?????? //计数频率100Hz=84/(TIM_Prescaler+1)/(TIM_Period+1)
?????? TIM_TimeBaseInitStre.TIM_Prescaler=84-1;//定时器频率84M/(840)=1us
?????? TIM_TimeBaseInitStre.TIM_Period=50000-1;//周期计数值500 T=200Hz=5ms?
?????? TIM_TimeBaseInitStre.TIM_ClockDivision=0x00;//不分频
?????? TIM_TimeBaseInitStre.TIM_CounterMode=TIM_CounterMode_Up ;
?????? TIM_TimeBaseInitStre.TIM_RepetitionCounter=0;
?????? TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStre);
??????
?????? TIM_SelectSlaveMode(TIM5,TIM_SlaveMode_Gated);
?????? TIM_SelectInputTrigger(TIM5,TIM_TS_ITR2);//设置输入触发源
?????? NVIC_InitStre.NVIC_IRQChannel=TIM5_IRQn;
?????? NVIC_InitStre.NVIC_IRQChannelPreemptionPriority=0x02;
?????? NVIC_InitStre.NVIC_IRQChannelSubPriority=0x01;
?????? NVIC_InitStre.NVIC_IRQChannelCmd=ENABLE;
?????? NVIC_Init(&NVIC_InitStre);//初始化
?????? TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
??????
?????? TIM_ARRPreloadConfig(TIM5, ENABLE);//使能自动装载
?????? TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE);????
?????? TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
??????
?????? TIM_Cmd(TIM5, ENABLE);//使能时钟,
}
//主触发器
void ????? Tim4_init(void)
{
?????? TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStre;
?????? NVIC_InitTypeDef NVIC_InitStre;
??????
?????? RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
?????? TIM_ITConfig(TIM4,TIM_IT_Update,DISABLE);
?????? TIM_Cmd(TIM4, DISABLE);
??????
?????? //计数频率100Hz=84/(TIM_Prescaler+1)/(TIM_Period+1)
?????? TIM_TimeBaseInitStre.TIM_Prescaler=84-1;//定时器频率84M/(840)=1us
?????? TIM_TimeBaseInitStre.TIM_Period=50000-1;//周期计数值500 T=200Hz=5ms?
?????? TIM_TimeBaseInitStre.TIM_ClockDivision=0x00;//不分频
?????? TIM_TimeBaseInitStre.TIM_CounterMode=TIM_CounterMode_Up ;
?????? TIM_TimeBaseInitStre.TIM_RepetitionCounter=0;
?????? TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStre);
??????
?????? TIM_SelectOutputTrigger(TIM4, TIM_TRGOSource_Enable);//设置输入触发源
?????? TIM_SelectMasterSlaveMode(TIM4,TIM_MasterSlaveMode_Enable);//使能主从模式
??????
?????? NVIC_InitStre.NVIC_IRQChannel=TIM4_IRQn;
?????? NVIC_InitStre.NVIC_IRQChannelPreemptionPriority=0x02;
?????? NVIC_InitStre.NVIC_IRQChannelSubPriority=0x03;
?????? NVIC_InitStre.NVIC_IRQChannelCmd=ENABLE;
?????? NVIC_Init(&NVIC_InitStre);//初始化
?????? TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
??????
?????? TIM_ARRPreloadConfig(TIM4, ENABLE);//使能自动装载
?????? TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);????
?????? TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
??????
?????? //TIM_Cmd(TIM4, ENABLE);//使能时钟，不要在这里使能
}
//我这里使用串口指令来使能定时器
Void Main_Time（vodi）
{
TIM_Cmd(TIM4 ENABLE);//在这里使能
}
//定时器5中断服务函数
void TIM5_IRQHandler(void)
{
????????????? ?????? if(TIM_GetITStatus(TIM5,TIM_IT_Update)==SET)
?????? {
GPIO_WriteBit(GPIOA,GPIO_Pin_11,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_11)));//LED
????????????? TIM_ClearITPendingBit(TIM5,TIM_IT_Update);//清除中断
?????? }
}
实验现象是，上电后，定时器5不被触发，led不闪烁
串口指令使能主定时器后，定时器5被触发，led闪烁
代码2：触发输出采用TIM_TRGOSource_OC3Ref
触发输入采用TIM_SlaveMode_Gated
//从定时器
void ????? Tim5_init(void)
{
?????? TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStre;
?????? NVIC_InitTypeDef NVIC_InitStre;
??????
?????? RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
?????? TIM_ITConfig(TIM5,TIM_IT_Update,DISABLE);
?????? TIM_Cmd(TIM5, DISABLE);
??????
?????? //计数频率100Hz=84/(TIM_Prescaler+1)/(TIM_Period+1)
?????? TIM_TimeBaseInitStre.TIM_Prescaler=84-1;//定时器频率84M/(840)=1us
?????? TIM_TimeBaseInitStre.TIM_Period=50000-1;//周期计数值500 T=200Hz=5ms?
?????? TIM_TimeBaseInitStre.TIM_ClockDivision=0x00;//不分频
?????? TIM_TimeBaseInitStre.TIM_CounterMode=TIM_CounterMode_Up ;
?????? TIM_TimeBaseInitStre.TIM_RepetitionCounter=0;
?????? TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStre);
??????
?????? TIM_SelectSlaveMode(TIM5,TIM_SlaveMode_Gated);//从模式配置?
?????? TIM_SelectInputTrigger(TIM5,TIM_TS_ITR3);//设置输入触发源
?????? //TIM_SelectMasterSlaveMode(TIM5,TIM_MasterSlaveMode_Enable);//使能主从模式
??????
?????? NVIC_InitStre.NVIC_IRQChannel=TIM5_IRQn;
?????? NVIC_InitStre.NVIC_IRQChannelPreemptionPriority=0x02;
?????? NVIC_InitStre.NVIC_IRQChannelSubPriority=0x01;
?????? NVIC_InitStre.NVIC_IRQChannelCmd=ENABLE;
?????? NVIC_Init(&NVIC_InitStre);//初始化
?????? TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
??????
?????? TIM_ARRPreloadConfig(TIM5, ENABLE);//使能自动装载
?????? TIM_ITConfig(TIM5,TIM_IT_Update,ENABLE);????
?????? TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
??????
?????? TIM_Cmd(TIM5, ENABLE);//使能时钟 //中断配置
}
//主定时器
void Tim8_init(void)
{
?????? TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStre;
?????? TIM_OCInitTypeDef TIM_OCInitStre;
??????
?????? RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
?????? PV_PEEP_IO_Init();//IO口初始化
??????
?????? //计数频率20kHz=168/(TIM_Prescaler+1)/(TIM_Period+1)
?????? TIM_TimeBaseInitStre.TIM_Prescaler=0;//定时器频率168M/(0+1)
?????? TIM_TimeBaseInitStre.TIM_Period=11200-1;//周期计数值 15k-11200? 一个计数值 改成20kHz-8400
?????? TIM_TimeBaseInitStre.TIM_ClockDivision=0x00;//不分频
?????? TIM_TimeBaseInitStre.TIM_CounterMode=TIM_CounterMode_CenterAligned1;
?????? TIM_TimeBaseInitStre.TIM_RepetitionCounter=0;
?????? TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStre);
??????
?????? TIM_OCInitStre.TIM_OCMode=TIM_OCMode_PWM1;
?????? TIM_OCInitStre.TIM_Pulse=0;//占空比0%
?????? TIM_OCInitStre.TIM_OCPolarity=TIM_OCPolarity_High ;
?????? TIM_OCInitStre.TIM_OutputState=TIM_OutputState_Enable ;
?????? TIM_OCInitStre.TIM_OCIdleState=TIM_OCIdleState_Reset ;
?????? TIM_OC3Init(TIM8, &TIM_OCInitStre);//消音圈
??????
?????? TIM_SelectOutputTrigger(TIM8,TIM_TRGOSource_OC3Ref);//触发输出源OC3
?????? TIM_SelectMasterSlaveMode(TIM8,TIM_MasterSlaveMode_Enable);//使能主从模式
??????
?????? TIM_CtrlPWMOutputs(TIM8, ENABLE);//高级定时器要加这个使能
?????? TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable);
? TIM_Cmd(TIM8, ENABLE);//使能时钟
}
//串口更改占空比
Void Set_CCR(void)
{
TIM8->CCR3=1000;
}
实验现象，开始占空比等于0，定时器5不被触发，led不闪烁；
使用串口发送指令，更改占空比，定时器5被触发，led闪烁