STM32輸出不同頻率PWM

STM32一定時(shí)器產(chǎn)生不同頻率的PWM(轉(zhuǎn)載)2011-05-0512:07平時(shí)記性實(shí)在太差，調(diào)試完的程序，過兩天又忘了，往往需要一陣子才能想起來，有時(shí)以前的資料找不到了，更是惱火，不得不重復(fù)到網(wǎng)上搜索。剛剛調(diào)試成功了一個(gè)類型的程序，3刻記下來，呵呵，不要又忘記了。STM32產(chǎn)生PWM是非常的方便的，要需要簡單的設(shè)置定時(shí)器，即刻產(chǎn)生！當(dāng)然，簡單的設(shè)置對于新手來產(chǎn)，也是麻煩的，主要包括：使能定時(shí)器時(shí)鐘：RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);定義相應(yīng)的GPIO：/*PA2,3,4,5,6輸出->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，檢測輸入的高電平GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//50M時(shí)鐘速度GPIO_Init(GPIOA,&GPIO_InitStructure);/*PA7用于發(fā)出PWM波，即無線數(shù)據(jù)傳送*/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//50M時(shí)鐘速度GPIO_Init(GPIOA,&GPIO_InitStructure);如果是產(chǎn)生PWM(頻率不變，占空比可變)，記得打開PWM控制，在TIM_Configuration()中。TIM_Cmd(TIM3,ENABLE);/*TIM1MainOutputEnable*/TIM_CtrlPWMOutputs(TIM1,ENABLE);利用定時(shí)器產(chǎn)生不同頻率的PWM有時(shí)候，需要產(chǎn)生不同頻率的PWM，這個(gè)時(shí)候，設(shè)置與產(chǎn)生相同PWM的程序，有關(guān)鍵的不一樣。設(shè)置的原理利用改變定時(shí)器輸出比較通道的捕獲值，當(dāng)輸出通道捕獲值產(chǎn)生中斷時(shí)，在中斷中將捕獲值改變，這時(shí)，輸出的I/O會(huì)產(chǎn)生一個(gè)電平翻轉(zhuǎn)，利用這種辦法，實(shí)現(xiàn)不同頻率的PWM輸出。關(guān)鍵設(shè)置在定時(shí)器設(shè)置中：TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Disable);在中斷函數(shù)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);}一個(gè)定時(shí)器四個(gè)通道，分別產(chǎn)生不同頻率(這個(gè)例子網(wǎng)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;//反向通道無效TIM_OCInitStructure.TIM_Pulse=CCR1_Val;〃占空時(shí)間TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low;〃輸出極性TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;//互補(bǔ)端的極性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;〃占空時(shí)間TIM_OC2Init(TIM2,&TIM_OCInitStructure);〃通道2TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Disable);TIM_OCInitStructure.TIM_Pulse=CCR3_Val;//占空時(shí)間TIM_OC3Init(TIM2,&TIM_OCInitStructure);〃通道3TIM_OC3PreloadConfig(TIM2,TIM_OCPreload_Disable);TIM_OCInitStructure.TIM_Pulse=CCR4_Val;//占空時(shí)間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;/*允許總線CLOCK,在使用GPIO之前必須允許相應(yīng)端的時(shí)鐘.從STM32的設(shè)計(jì)角度上說，沒被允許的端將不接入時(shí)鐘，也就不會(huì)耗能，這是STM32節(jié)能的一種技巧,*/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輸出->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;//開漏輸出GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//50M時(shí)鐘速度GPIO_Init(GPIOA,&GPIO_InitStructure);/*PB0,1輸出->LED7,LED8*/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_OD;//開漏輸出GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//50M時(shí)鐘速度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;//上拉輸入GPIO_Init(GPIOA,&GPIO_InitStructure);/*PC13->KEY_UP*/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;//上拉輸入GPIO_Init(GPIOC,&GPIO_InitStructure);/*PB5->KEY_DOWN*/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;//上拉輸入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);}}一個(gè)定時(shí)器一個(gè)通道，產(chǎn)生不同頻率其它的設(shè)置都一樣，就是在主函數(shù)中修改一個(gè)參數(shù)，然后在定時(shí)器中斷中，根據(jù)這個(gè)參數(shù)，改變頻率。#include〃stm32lib\\stm32f10x.h〃#include〃hal.h〃volatileu16Key_Value=1000;//用于保存按鍵相應(yīng)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)//按鍵前進(jìn)按下，對應(yīng)1kHz{Key_Value=6000;}elseif(Get_Key_Down)//按鍵后退按下，對應(yīng)2kHz{Key_Value=3000;}Delay_Ms(20);//10ms延時(shí)if(Get_Key_Left)//按鍵左轉(zhuǎn)按下，對應(yīng)3kHz{Key_Value=2000;}elseif(Get_Key_Right)//按鍵右轉(zhuǎn)按下，對應(yīng)4kHz{Key_Value=1500;}Delay_Ms(20);//10ms延時(shí)if(Get_Key_Ctrl)//按鍵控制按下，對應(yīng)5kHz{Key_Value=1200;}Delay_Ms(20);//10ms延時(shí)}}}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時(shí)鐘配置*/TIM_TimeBaseStructure.TIM_Prescaler=5;//預(yù)分頻(時(shí)鐘分頻)72M/6=12MTIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上計(jì)數(shù)TIM_TimeBaseStructure.TIM_Period=65535;//裝載值選擇最大TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_RepetitionCounter=0x0;TIM_TimeBaseInit(TIM3,&TIM_Time