STM32TIM模塊產(chǎn)生PWM

這個是STM32的PWM輸出模式，STM32的TIM1模塊是增強型的定時器模塊，天生就是為電機控制而生，可以產(chǎn)生3組6路PWM，同時每組2路PWM為互補，并可以帶有死區(qū)，可以用來驅(qū)動H橋。

　　下面的代碼，是利用TIM1模塊的1、2通道產(chǎn)生一共4路PWM的代碼例子，類似代碼也可以參考ST的固件庫中相應example

本文引用地址：http://www.ex-cimer.com/article/201612/325026.htm
C語言:TIM1模塊產(chǎn)生PWM，帶死區(qū)

//Step1.開啟TIM和相應端口時鐘
//啟動GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,
ENABLE);
//啟動AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//啟動TIM1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
//Step2. GPIO做相應設置，為AF輸出
//PA.8/9口設置為TIM1的OC1輸出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//PB.13/14口設置為TIM1_CH1N和TIM1_CH2N輸出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//Step3. TIM模塊初始化
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
//TIM1基本計數(shù)器設置（設置PWM頻率）
//頻率=TIM1_CLK/(ARR+1)
TIM_BaseInitStructure.TIM_Period = 1000-1;
TIM_BaseInitStructure.TIM_Prescaler = 72-1;
TIM_BaseInitStructure.TIM_ClockDivision = 0;
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
//啟用ARR的影子寄存器（直到產(chǎn)生更新事件才更改設置）
TIM_ARRPreloadConfig(TIM1, ENABLE);
//TIM1_OC1模塊設置（設置1通道占空比）
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 120;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
//啟用CCR1寄存器的影子寄存器（直到產(chǎn)生更新事件才更改設置）
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
//TIM2_OC2模塊設置（設置2通道占空比）
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 680;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
//啟用CCR2寄存器的影子寄存器（直到產(chǎn)生更新事件才更改設置）
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

//死區(qū)設置
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 0x90; //這里調(diào)整死區(qū)大小0-0xff
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

//TIM1開啟
TIM_Cmd(TIM1, ENABLE);
//TIM1_OC通道輸出PWM（一定要加）
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

　　其實，PWM模塊還可以有很多花樣可以玩，比方在異常時（如CPU時鐘有問題），可以緊急關閉輸出，以免發(fā)生電路燒毀等嚴重事故