STM32定时器的频率配置(共7页).doc

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1、精选优质文档-倾情为你奉上STM32定时器的频率配置STM32 定时器产生不同频率的PWM 平时记性实在太差，调试完的程序，过两天又忘了，往往需要一阵子才能想起来，有时以前的资料找不到了，更是恼火，不得不重复到网上搜索。刚刚调试成功了一个类型的程序，立刻记下来，呵呵，不要又忘记了。 STM32产生PWM是非常的方便的，要需要简单的设置定时器，即刻产生！当然，简单的设置对于新手来产，也是麻烦的，主要包括：（1）使能定时器时钟：RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);（2）定义相应的GPIO： /* PA2,3,4,5,6输出-Key

2、_Up,Key_Down,Key_Left,Key_Right,Key_Ctrl */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; /下拉接地，检测输入的高电平GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /50M时钟速度GPIO_Init(GPIOA, &GPIO_InitStructure);/* PA7用于发出PWM波,即

3、无线数据传送 */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /50M时钟速度GPIO_Init(GPIOA, &GPIO_InitStructure);（3）如果是产生PWM（频率不变，占空比可变），记得打开PWM控制，在TIM_Configuration()中。TIM_Cmd(TIM3,ENABLE);/* TIM1 Main Output Enable */T

4、IM_CtrlPWMOutputs(TIM1,ENABLE);利用定时器产生不同频率的PWM 有时候，需要产生不同频率的PWM，这个时候，设置与产生相同PWM的程序，有关键的不一样。（一） 设置的原理 利用改变定时器输出比较通道的捕获值，当输出通道捕获值产生中断时，在中断中将捕获值改变，这时， 输出的I/O会产生一个电平翻转，利用这种办法，实现不同频率的PWM输出。（二）关键设置在定时器设置中：TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);在中断函数中： if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RE

5、SET) TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); capture = TIM_GetCapture2(TIM3); TIM_SetCompare2(TIM3, capture + Key_Value);一个定时器四个通道，分别产生不同频率（这个例子网上也有）vu16 CCR1_Val = 32768;vu16 CCR2_Val = 16384;vu16 CCR3_Val = 8192;vu16 CCR4_Val = 4096; void TIM_Configuration(void)TIM_TimeBaseInitTypeDef TIM_TimeBas

6、eStructure;TIM_OCInitTypeDef TIM_OCInitStructure;/* TIM2 clock enable */RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);/* -TIM2 Configuration: Output Compare Toggle Mode:TIM2CLK = 36 MHz, Prescaler = 0x2, TIM2 counter clock = 12 MHz CC1 update rate = TIM2 counter clock / CCR1_Val = 366.2 HzCC2

7、update rate = TIM2 counter clock / CCR2_Val = 732.4 Hz CC3 update rate = TIM2 counter clock / CCR3_Val = 1464.8 Hz CC4 update rate = TIM2 counter clock / CCR4_Val = 2929.6 Hz - */* Time base configuration */TIM_TimeBaseStructure.TIM_Period = 65535; TIM_TimeBaseStructure.TIM_Prescaler = 2; TIM_TimeBa

8、seStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);/* Channel 1 Configuration in PWM mode */TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; /PWM模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enab

9、le; /正向通道有效TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;/反向通道无效TIM_OCInitStructure.TIM_Pulse = CCR1_Val; /占空时间TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; /输出极性TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; /互补端的极性 TIM_OCInitStructure.TIM_OCIdleState = TIM

10、_OCIdleState_Set;TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM2,&TIM_OCInitStructure); /通道1TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);TIM_OCInitStructure.TIM_Pulse = CCR2_Val; /占空时间TIM_OC2Init(TIM2,&TIM_OCInitStructure); /通道2TIM_OC2PreloadConfig(TIM2, TIM_OCPre

11、load_Disable);TIM_OCInitStructure.TIM_Pulse = CCR3_Val; /占空时间TIM_OC3Init(TIM2,&TIM_OCInitStructure); /通道3TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);TIM_OCInitStructure.TIM_Pulse = CCR4_Val; /占空时间TIM_OC4Init(TIM2,&TIM_OCInitStructure); /通道4TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);/* T

12、IM2 counter enable */TIM_Cmd(TIM2,ENABLE);/* TIM2 Main Output Enable */TIM_CtrlPWMOutputs(TIM2,ENABLE); /* TIM IT enable */TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);void GPIO_Configuration(void)GPIO_InitTypeDef GPIO_InitStructure;/*允许总线CLOCK,在使用GPIO之前必须允许相应端的时钟.从S

13、TM32的设计角度上说,没被允许的端将不接入时钟,也就不会耗能,这是STM32节能的一种技巧,*/RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);/* PA2,3,4,5,6,7输出-LED1,LED2,LED3,LED4,

14、LED5,LED6 */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; /开漏输出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /50M时钟速度GPIO_Init(GPIOA, &GPIO_InitStructure);/* PB0,1输出-LED7,LED8*/GPIO_InitStructure.G

15、PIO_Pin = GPIO_Pin_0|GPIO_Pin_1;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; /开漏输出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /50M时钟速度GPIO_Init(GPIOB, &GPIO_InitStructure);/* PA0,1-KEY_LEFT,KEY_RIGHT*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;GPIO_InitStructure.GPIO_Mode = GPIO_M

16、ode_IPU; /上拉输入GPIO_Init(GPIOA, &GPIO_InitStructure);/* PC13-KEY_UP*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; /上拉输入GPIO_Init(GPIOC, &GPIO_InitStructure);/* PB5-KEY_DOWN*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IP

17、U; /上拉输入GPIO_Init(GPIOB, &GPIO_InitStructure);/* GPIOA Configuration:TIM2 Channel1, 2, 3 and 4 in Output */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,

18、&GPIO_InitStructure);void NVIC_Configuration(void)NVIC_InitTypeDef NVIC_InitStructure;/* Configure one bit for preemption priority */NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStructure.N

19、VIC_IRQChannelSubPriority=1;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure);u16 capture = 0;extern vu16 CCR1_Val;extern vu16 CCR2_Val;extern vu16 CCR3_Val;extern vu16 CCR4_Val;void TIM2_IRQHandler(void)/* TIM2_CH1 toggling with frequency = 183.1 Hz */if (TIM_GetITStatus(T

20、IM2, TIM_IT_CC1) != RESET) TIM_ClearITPendingBit(TIM2, TIM_IT_CC1 );capture = TIM_GetCapture1(TIM2);TIM_SetCompare1(TIM2, capture + CCR1_Val );/* TIM2_CH2 toggling with frequency = 366.2 Hz */if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);capture = TIM_GetCap

21、ture2(TIM2); TIM_SetCompare2(TIM2, capture + CCR2_Val); /* TIM2_CH3 toggling with frequency = 732.4 Hz */if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET) TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);capture = TIM_GetCapture3(TIM2); TIM_SetCompare3(TIM2, capture + CCR3_Val);/* TIM2_CH4 toggling with freque

22、ncy = 1464.8 Hz */if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET) TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);capture = TIM_GetCapture4(TIM2); TIM_SetCompare4(TIM2, capture + CCR4_Val);一个定时器一个通道，产生不同频率其它的设置都一样，就是在主函数中修改一个参数，然后在定时器中断中，根据这个参数，改变频率。#include stm32libstm32f10x.h#include hal.hvolatile u16 Key

23、_Value=1000; /用于保存按键相应的PWM波占空比值int main(void)ChipHalInit();ChipOutHalInit();while(1) if( (!Get_Key_Up)&(!Get_Key_Down)&(!Get_Key_Left)&(!Get_Key_Right)&(!Get_Key_Ctrl) ) Key_Value=12000; else if(Get_Key_Up) /按键前进按下 ,对应1kHz Key_Value=6000; else if(Get_Key_Down) /按键后退按下 ,对应2kHz Key_Value=3000; Delay_M

24、s(20); /10ms延时 if(Get_Key_Left) /按键左转按下,对应3kHz Key_Value=2000; else if(Get_Key_Right) /按键右转按下,对应4kHz Key_Value=1500; Delay_Ms(20); /10ms延时 if(Get_Key_Ctrl) /按键控制按下,对应5kHz Key_Value=1200; Delay_Ms(20); /10ms延时 extern volatile u16 Key_Value;u16 capture=0;void TIM3_IRQHandler(void)/* TIM2_CH2 toggling

25、with frequency = 366.2 Hz */if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET) TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);capture = TIM_GetCapture2(TIM3); TIM_SetCompare2(TIM3, capture + Key_Value); void TIM3_Configuration(void)TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;TIM_OCInitTypeDef TIM_OCInitStru

26、cture;/* TIM2 clock enable */RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);/*TIM1时钟配置*/TIM_TimeBaseStructure.TIM_Prescaler = 5; /预分频(时钟分频)72M/6=12MTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /向上计数TIM_TimeBaseStructure.TIM_Period = 65535; /装载值选择最大TIM_TimeBaseStructure.TIM_ClockD

27、ivision = TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);/* Channel 1 Configuration in PWM mode */TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; /PWM模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; /正向通道有效TIM_OCInitSt

28、ructure.TIM_OutputNState = TIM_OutputNState_Disable;/反向通道无效TIM_OCInitStructure.TIM_Pulse = Key_Value; /占空时间TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; /输出极性TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; /互补端的极性 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;TIM_O

29、CInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC2Init(TIM3,&TIM_OCInitStructure); /通道2TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);/* TIM1 counter enable */TIM_Cmd(TIM3,ENABLE);/* TIM1 Main Output Enable */TIM_CtrlPWMOutputs(TIM1,ENABLE); TIM_ITConfig(TIM3, TIM_IT_CC2 , ENABLE); 注意：在计算PWM频率的时候，TIMx的时钟都是72Mhz，分频后，因为翻转两次才能形成一个PWM波，因为，PWM的频率是捕获改变频率的1/2。专心-专注-专业