TIM1_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; //MOE=1且定时器不工作时,CHx和CHxN的输出状态 TIM1_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; //MOE=0且定时器不工作时,CHx和CHxN的输出状态(详情看用户手册,一般都是ENABLE,不用深究) TIM1_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; //BDTR寄存器写保护等级,防止软件错误误写。 TIM1_BDTRInitStructure.TIM_DeadTime = DEADTIME; //设置死区时间 TIM1_BDTRInitStructure.TIM_Break = TIM_Break_Enable; //使能TIM1刹车输入(BKIN),要把BKIN引脚拉低才有PWM输出 TIM1_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High; //刹车输入(BKIN)输入高电平有效 TIM1_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable; //刹车有效标志只能被软件清除,不能被自动清除 TIM_BDTRConfig(TIM1, &TIM1_BDTRInitStructure);
时间: 2024-04-24 12:21:14 浏览: 178
这段代码是配置STM32的定时器TIM1的BDTR寄存器的设置。下面是对代码中各个参数的解释:
- `TIM_OSSRState_Enable`:当MOE(主输出使能)为1且定时器不工作时,保持通道x和通道xN的输出状态。
- `TIM_OSSIState_Enable`:当MOE为0且定时器不工作时,保持通道x和通道xN的输出状态。一般情况下都是启用该功能,具体请参考用户手册。
- `TIM_LOCKLevel_1`:设置BDTR寄存器的写保护等级,以防止误写。
- `DEADTIME`:设置死区时间,用于在切换PWM信号的两个输出通道之间产生一个延迟。
- `TIM_Break_Enable`:使能TIM1的刹车输入(BKIN),要将BKIN引脚拉低才能产生PWM输出。
- `TIM_BreakPolarity_High`:刹车输入(BKIN)为高电平有效。
- `TIM_AutomaticOutput_Disable`:刹车有效标志只能被软件清除,不能自动清除。
最后一行代码`TIM_BDTRConfig(TIM1, &TIM1_BDTRInitStructure);`是将上述配置应用到TIM1的BDTR寄存器,以实现相应的设置。根据具体需求,可以根据该代码模板进行相应的修改和调整。
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void TIM4_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_Initstructure; TIM_TimeBaseInitTypeDef TIM_TimeBasestructure; TIM_ocInitTypeDef TIM_OCInitStructure; //TIM4/GPIOA/AFIO CLK enable RCC_APB1PeriphclockCmd (RCC_APBlPeriph_TIM4,ENABLE); Rcc_APB2PeriphclockCmd(Rcc_APB2Periph_GPIOB , ENABLE); Rcc_APB2PeriphClockCmd (RCC_APB2Periph_AFIO ,ENABLE); //set PB6(TIM4_CHl) PB7(TIM4_CH2) as AF output mode for PRM output GPIO_Initstructure.GPIO_Pin = GPIO_Pin_6 l GPIO_Pin_7; GPIO_Initstructure.GPIO_Mode = GPIo_Mode_AF_PP; GPIO_Initstructure.GPIo_Speed = GPIo_Speed_5OMHz; GPIO_Init(GPIOB,&GPIO_Initstructure); //TIM4 base config TIM_TimeBasestructure.TIM_Period = arr; TIM_TimeBasestructure.TIM_Prescaler = psc; TIM_TimeBasestructure.TIM_C1ockDivision = 0; TIM_TimeBasestructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit (TIM4,&TIM_TimeBasestructure) ; //PWM of TIM4_CHl config TIM_OCInitstructure.TIM_OCMode = TIM_OcMode_PWM1; TIM_OCInitstructure.TIM_Outputstate = TIM_Outputstate_Enable; TIM_OcInitstructure.TIM_Pulse = 0; TIM_OCInitstructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init (TIM4,&TIM_OCInitStructure) ; TIM_OClpreloadConfig(TIM4,TIM_OCPreload_Enable); // PWM of TIM4_CH2 config TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWMl; TIM_OCInitstructure.TIM_Outputstate = TIM_Outputstate_Enable; TIM_OCInitStructure.TIM_Pulse =0; TIM_OCInitstructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC2Init (TIM4,&TIM_OCInitStructure) ; TIM_OC2PreloadConfig(TIM4,TIM_OCPreload_Enable) ; //TIM4 preload enable TIM_ARRPreloadconfig (TIM4,ENABLE); //MOE enable for advanced TIMl or TIM8 TIM_Ctr1PWMOutputs (TIM4,ENABLE); //TIM4 enable TIM_Cmd (TIM4,ENABLE);
这是一段STM32的代码,用于初始化TIM4定时器和PWM输出。其中,通过GPIO_InitTypeDef结构体初始化GPIOB的PB6和PB7引脚,将它们设置为复用推挽输出模式(AF_PP)。通过TIM_TimeBaseInitTypeDef结构体初始化TIM4的时基参数,包括周期(arr)、预分频器(psc)、时钟分频等。接下来通过TIM_ocInitTypeDef结构体初始化TIM4的PWM输出参数,包括输出模式(TIM_OcMode_PWM1)、输出使能(TIM_Outputstate_Enable)、PWM脉宽(TIM_Pulse)、极性(TIM_OCPolarity_High)等。最后通过TIM_Cmd函数使能TIM4定时器,并通过TIM_Ctr1PWMOutputs函数使能定时器的PWM输出。
给这段程序加注释TIM15->CR2 = TIM_CR2_MMS_2|TIM_CR2_MMS_0; // TRGO trigger = oc2 TIM15->CCR1 = ADC_CHANGEOVR/4; TIM15->CCR2 = ADC_CHANGEOVR; TIM15->CCR3 = 0; TIM15->CCR4 = 0; TIM15->SMCR = 0; TIM15->CCMR1 = TIM_CCMR1_OC1M | TIM_CCMR1_OC1PE |TIM_CCMR1_OC2M ;//| TIM_CCMR1_OC2PE ; TIM15->CCMR2 = 0; TIM15->CCER = TIM_CCER_CC1E | TIM_CCER_CC1P| TIM_CCER_CC2E |TIM_CCER_CC2P; TIM15->DIER = TIM_DIER_CC1IE; TIM15->EGR = 0; TIM15->BDTR = 0;//TIM_BDTR_AOE|TIM_BDTR_MOE;
答:这段程序是给定时器TIM15进行初始化设置的,注释中的代码表示使用TIM15的定时器输出触发OC2,并且使用ADC_CHANGEOVR/4作为CC1的比较值,使用ADC_CHANGEOVR作为CC2的比较值,其他通道的比较值为0。TIM15的SMCR设置为0,CCMR1用于配置CC1和CC2的输出模式和预装载,CCMR2没有配置。CCER开启CC1和CC2的比较输出,并且设置极性为反相输出。DIER使能CC1的比较中断,EGR事件清零。BDTR没有设置任何参数。
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