STM32学习笔记六TIM 待补充.docx
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STM32学习笔记六TIM待补充
STM32学习笔记(六)----TIM(待补充)
1、使能TIM时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM*,ENABLE);
2、基础设置
TIM_TimeBaseStructure.TIM_Period计数值
TIM_TimeBaseStructure.TIM_Prescaler预分频,此值+1为分频的除数
TIM_TimeBaseStructure.TIM_ClockDivision=0时钟因子待做进一步说明
TIM_TimeBaseStructure.TIM_RepetitionCounter=0待做进一步说明
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up向上计数
TIM_CounterMode_Dowm向下计数
TIM_CounterMode_CenterAligned1中心对齐方式1
TIM_CounterMode_CenterAligned2中心对齐方式2
TIM_CounterMode_CenterAligned3中心对齐方式3
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
3、通道设置
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输出比较&PWM通道
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Timing输出比较时间模式(输出引脚冻结无效)
TIM_OCMode_Active输出比较主动模式(匹配时设置输出引脚为有效电平,当计数值为比较/捕获寄存器值相同时,强制输出为高电平)
TIM_OCMode_Inactive;输出比较非主动模式(匹配时设置输出引脚为无效电平,当计数值为比较/捕获寄存器值相同时,强制输出为低电平)
TIM_OCMode_Toggle输出比较触发模式(翻转。
当计数值与比较/捕获寄存器值相同时,翻转输出引脚的电平)
TIM_OCMode_PWM1向上计数时,当TIMx_CNT<TIMx_CCR*时,输出电平有效,否则为无效
向下计数时,当TIMx_CNT>TIMx_CCR*时,输出电平无效,否则为有效
TIM_OCMode_PWM2与PWM1模式相反
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Disable禁止OC*输出
TIM_OutputState_Enable开启OC*输出到对应引脚
TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Disable互补输出使能。
关闭OC*N输出
TIM_OutputNState_Enable互补输出使能。
开启OC*N输出到对应的引脚
TIM_OCInitStructure.TIM_Pulse比较/PWM通道的值
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;极性为正
TIM_OCPolarity_Low极必为负
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;极性为正
TIM_OCNPolarity_Low极必为负
TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set当MOE=0时,如果实现了OC*N,则死区后OC*=1
TIM_OCIdleState_Reset当MOE=0时,如果实现了OC*N,则死区后OC*=0
TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCIdleNState_Set当MOE=0时,死区后OC*N=1
TIM_OCIdleNState_Reset当MOE=0时,死区后OC*N=0
TIM_OC1Init(TIM2,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Disable);禁止OC1重装载,即TIM*_CCR*的数一经写入立即生效,否则要在下一个更新事件到来后才被装入寄存器TIM_CtrlPWMOutputs(TIM1,ENABLE);如果使用PWM模式,则此句一定不能省
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输入捕获通道
TIM_ICInitStructure.TIM_Channel=TIM_Channel_1
TIM_Channel_2
TIM_Channel_3
TIM_Channel_4
TIM_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising输入/捕获上升沿有效
TIM_ICPolarity_Falling输入/捕获下降沿有效
TIM_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTIIC*输入引脚选择,针对IC1/IC2有不同的定义
TIM_ICSelection_IndirectTI
TIM_ICSelection_TRC
TIM_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1输入模式下,捕获端口上的每一次边沿都触发一次捕获
TIM_ICPSC_DIV2输入模式下,每2次事件触发一次捕获
TIM_ICPSC_DIV4输入模式下,每4次事件触发一次捕获
TIM_ICPSC_DIV8输入模式下,每8次事件触发一次捕获
TIM_ICInitStructure.TIM_ICFilter=捕获采样频率,详见TIM*_CCMR->IC*F说明
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死区设置
TIM_BDTRInitStructure.TIM_OSSRState=TIM_OSSRState_Enable
TIM_OSSRState_Disable
TIM_BDTRInitStructure.TIM_OSSRIState=TIM_OSSRIState_Enable
TIM_OSSRIState_Disable
TIM_BDTRInitStructure.TIM_LOCKLevel=TIM_LOCKLevel_OFF
TIM_LOCKLevel_1
TIM_LOCKLevel_2
TIM_LOCKLevel_3
TIM_BDTRInitStructure.TIM_DeadTime=这里调整死区大小0-0xff
TIM_BDTRInitStructure.TIM_Break=TIM_Break_Enable
TIM_Break_Disable
TIM_BDTRInitStructure.TIM_BreakPolarity=TIM_BreakPolarity_Low
TIM_BreakPolarity_High
TIM_BDTRInitStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Enable
TIM_AutomaticOutPut_Disable4、配置中断
5、开启TIM
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例:
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
TIM_OCInitTypeDefTIM_OCInitStructure;
u16CCR1_Val=60000;
u16CCR2_Val=40000;
u16CCR3_Val=20000;
u16CCR4_Val=10000;/*TIM2clockenable*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
/*基础设置*/
TIM_TimeBaseStructure.TIM_Period=65535;//计数值
TIM_TimeBaseStructure.TIM_Prescaler=7200-1;//预分频,此值+1为分频的除数
TIM_TimeBaseStructure.TIM_ClockDivision=0x0;//
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);/*比较通道1*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Inactive;//输出比较非主动模式
TIM_OCInitStructure.TIM_Pulse=CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//极性为正
TIM_OC1Init(TIM2,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Disable);//禁止OC1重装载,其实可以省掉这句,因为默认是4路都不重装的./*比较通道2*/
TIM_OCInitStructure.TIM_Pulse=CCR2_Val;TIM_OC2Init(TIM2,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Disable);/*比较通道3*/
TIM_OCInitStructure.TIM_Pulse=CCR3_Val;TIM_OC3Init(TIM2,&TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM2,TIM_OCPreload_Disable);/*比较通道4*/
TIM_OCInitStructure.TIM_Pulse=CCR4_Val;TIM_OC4Init(TIM2,&TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM2,TIM_OCPreload_Disable);/*使能预装载*/
TIM_ARRPreloadConfig(TIM2,ENABLE);
/*预先清除所有中断位*/
TIM_ClearITPendingBit(TIM2,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4|TIM_IT_Update);
/*4个通道和溢出都配置中断*/
TIM_ITConfig(TIM2,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4|TIM_IT_Update,ENABLE);/*允许TIM2开始计数*/
TIM_Cmd(TIM2,ENABLE);