STM32输出不同频率PWM

STM32一定时器产生不同频率的PWM(转载)2011-05-0512:07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，3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：使能定时器时钟：RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);定义相应的GPIO：/*PA2,3,4,5,6输出->Key_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);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);/*TIM1MainOutputEnable*/TIM_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。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。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)!=RESET){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)vu16CCR1_Val=32768;vu16CCR2_Val=16384;vu16CCR3_Val=8192;vu16CCR4_Val=4096;voidTIM_Configuration(void){TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;TIM_OCInitTypeDefTIM_OCInitStructure;/*TIM2clockenable*/RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);/*TIM2Configuration:OutputCompareToggleMode:TIM2CLK=36MHz,Prescaler=0x2,TIM2counterclock=12MHzCC1updaterate=TIM2counterclock/CCR1_Val=366.2HzCC2updaterate=TIM2counterclock/CCR2_Val=732.4HzCC3updaterate=TIM2counterclock/CCR3_Val=1464.8HzCC4updaterate=TIM2counterclock/CCR4_Val=2929.6Hz*//*Timebaseconfiguration*/TIM_TimeBaseStructure.TIM_Period=65535;TIM_TimeBaseStructure.TIM_Prescaler=2;TIM_TimeBaseStructure.TIM_ClockDivision=0;TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);/*Channel1ConfigurationinPWMmode*/TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Toggle;//PWM模式2TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//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_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_OCPreload_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);/*TIM2counterenable*/TIM_Cmd(TIM2,ENABLE);/*TIM2MainOutputEnable*///TIM_CtrlPWMOutputs(TIM2,ENABLE);/*TIMITenable*/TIM_ITConfig(TIM2,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);}voidGPIO_Configuration(void){GPIO_InitTypeDefGPIO_InitStructure;/*允许总线CLOCK,在使用GPIO之前必须允许相应端的时钟.从STM32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,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.GPIO_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_Mode_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_IPU;//上拉输入GPIO_Init(GPIOB,&GPIO_InitStructure);/*GPIOAConfiguration:TIM2Channel1,2,3and4inOutput*/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);}voidNVIC_Configuration(void){NVIC_InitTypeDefNVIC_InitStructure;/*Configureonebitforpreemptionpriority*/NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure);}u16capture=0;externvu16CCR1_Val;externvu16CCR2_Val;externvu16CCR3_Val;externvu16CCR4_Val;voidTIM2_IRQHandler(void){/*TIM2_CH1togglingwithfrequency=183.1Hz*/if(TIM_GetITStatus(TIM2,TIM_IT_CC1)!=RESET){TIM_ClearITPendingBit(TIM2,TIM_IT_CC1);capture=TIM_GetCapture1(TIM2);TIM_SetCompare1(TIM2,capture+CCR1_Val);}/*TIM2_CH2togglingwithfrequency=366.2Hz*/if(TIM_GetITStatus(TIM2,TIM_IT_CC2)!=RESET){TIM_ClearITPendingBit(TIM2,TIM_IT_CC2);capture=TIM_GetCapture2(TIM2);TIM_SetCompare2(TIM2,capture+CCR2_Val);}/*TIM2_CH3togglingwithfrequency=732.4Hz*/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_CH4togglingwithfrequency=1464.8Hz*/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〃stm32lib\\stm32f10x.h〃#include〃hal.h〃volatileu16Key_Value=1000;//用于保存按键相应的PWM波占空比值intmain(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;}elseif(Get_Key_Down)//按键后退按下，对应2kHz{Key_Value=3000;}Delay_Ms(20);//10ms延时if(Get_Key_Left)//按键左转按下，对应3kHz{Key_Value=2000;}elseif(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}}}externvolatileu16Key_Value;u16capture=0;voidTIM3_IRQHandler(void){/*TIM2_CH2togglingwithfrequency=366.2Hz*/if(TIM_GetITStatus(TIM3,TIM_IT_CC2)!=RESET){TIM_ClearITPendingBit(TIM3,TIM_IT_CC2);capture=TIM_GetCapture2(TIM3);TIM_SetCompare2(TIM3,capture+Key_Value);}}voidTIM3_Configuration(void){TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;TIM_OCInitTypeDefTIM_OCInitStructure;/*TIM2clockenable*/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_ClockDivision=TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_RepetitionCounter=0x0;TIM_TimeBaseInit(TIM3,&TIM_Time