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1、stm32 pwm 输出一定数量脉冲利用定时器PWM模式输出一定数量脉冲 方式：定时器的同步，以一个定时器作为另一个定时器的与分频器方式。 具体代码实现： void Tim4_Slave_Init(void) TIM_DeInit(TIM4); 器，使之进入初始状态 /主要用于复位TIM4定时 /自动重装 TIM_TimeBaseStructure.TIM_Period=pulnum; 载寄存器的值 / void Tim1_PWM_Init(void) CCR1_Val = (timer1_period+1)/2; TIM_SelectInputTrigger(TIM4,TIM_TS_ITR0
2、); TIM_InternalClockConfig(TIM4); TIM4-SMCR = 0X07;/设定从模式控制寄存器 /TIM_UpdateDisableConfig(TIM4,ENABLE); TIM_ARRPreloadConfig(TIM4, ENABLE); TIM_ClearFlag(TIM4,TIM_FLAG_Update); TIM_TimeBaseStructure.TIM_Prescaler=0; /时钟预分频数 /采样分频 TIM_TimeBaseStructure.TIM_ClockDivision=0; TIM_TimeBaseStructure.TIM_Cou
3、nterMode=TIM_CounterMode_Up;/向上溢出 TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure); /清除溢出中断标志 TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE); TIM_Cmd(TIM4,ENABLE);/是否开启时钟 CCR2_Val = (timer1_period+1)/2; /* - TIM1 Configuration: generate 4 PWM signals with 4 different duty cycles: TIM1CLK = 36 MHz, Prescaler =
4、 0x0, TIM1 counter clock = 36 MHz TIM1 ARR Register = 999 = TIM1 Frequency = TIM1 counter clock/(ARR + 1) TIM1 Frequency = 36 KHz. TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 50% TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR)* 100 = 50% TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR)*
5、 100 = 50% TIM1 Channel4 duty cycle = (TIM1_CCR4/ TIM1_ARR)* 100 = 50% - */ /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = timer1_period; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up
6、; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); TIM1-CR1 &= (u16)0x03FD);/ UDIS enable /* PWM1 Mode configuration: Channel1 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR1_Val; TIM_OCInitStructu
7、re.TIM_OCPolarity = TIM_OCPolarity_High; CCR3_Val = (timer1_period+1)/2; CCR4_Val = (timer1_period+1)/2; GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); TIM_OC1Init(TIM1, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); /* PWM1 Mode configuration: Channel2 */ TIM_OCInitStru
8、cture.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR2_Val; TIM_OC2Init(TIM1, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); /* PWM1 Mode configuration: Channel3 */ TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructu
9、re.TIM_Pulse = CCR3_Val; TIM_OC3Init(TIM1, &TIM_OCInitStructure); TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); /* PWM1 Mode configuration: Channel4 */ TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR4_Val; TIM_OC4Init(TIM1, &TIM_OCInitStructure);
10、 TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM1, ENABLE);/apre TIM_SelectOutputTrigger(TIM1,TIM_TRGOSource_Update); /* TIM1 enable counter */ TIM_Cmd(TIM1, ENABLE); /* Main Output Enable */ TIM_CtrlPWMOutputs(TIM1, ENABLE); void TIM4_IRQHandler(void) GPIO_InitTypeDef GPI
11、O_InitStructure; if (TIM_GetITStatus(TIM4,TIM_IT_Update) != RESET) TIM_ClearITPendingBit(TIM4,TIM_IT_Update); /进入中断后把通道GPIO关闭，达到控制脉冲目的 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_11 | GPIO_Pin_13 | GPIO_Pin_14; GPIO_Init(GPIOE, &GPIO_InitStructure); TIM_Cmd(TIM4,DISABLE);/关闭定时器4 GPIO_SetBits(GPIOE, GPIO_Pin_9); GPIO_SetBits(GPIOE, GPIO_Pin_11); GPIO_SetBits(GPIOE, GPIO_Pin_13); GPIO_SetBits(GPIOE, GPIO_Pin_14); GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 当想发送一定脉冲时，配置TIM4ARR寄存器，使能TIM4，即可发送一定数量脉冲
