STM32生成互补PWM波（输出前均为低电平）
u32 TIM1_PWM_Init(u32 Frequency,u16 DeadTime,u8 PulseNum)
{
//此部分需手动修改IO口设置
u32 arr=0;
u16 SetTime=0;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_BDTRInitTypeDef TIM_BDTRStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //TIM1时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能PORTA时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); //使能PORTA时钟
GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1); //GPIOA8复用为定时器1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_TIM1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_TIM1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_TIM1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_TIM1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11; //GPIOA8
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA8
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_Init(GPIOB,&GPIO_InitStructure);
TIM_DeInit(TIM1);
arr=SystemCoreClock/Frequency;
TIM_TimeBaseStructure.TIM_Prescaler=0; //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=arr-1; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter=PulseNum;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1
TIM_SelectOnePulseMode(TIM1,TIM_OPMode_Single);
//初始化TIM1 Channel1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性低
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High ;//互补输出极性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//指定空闲状态下的TIM输出比较的引脚状态。
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;//指定空闲状态下的TIM互补输出比较的引脚状态。
TIM_OCInitStructure.TIM_Pulse = arr/2;
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OC4Init(TIM1, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OC2Init(TIM1, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OC3Init(TIM1, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1 4OC1
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器
if(DeadTime<755)
{
SetTime=DeadTime/5.95;
}
else if(DeadTime>761&&DeadTime<1511)
{
SetTime=DeadTime/11.9-64+128;
}
else if(DeadTime>1511&&DeadTime<2973)
{
SetTime=DeadTime/47.2-32+192;
}
else if(DeadTime>3020&&DeadTime<5947)
{
SetTime=DeadTime/94.4-32+224;
}
TIM_BDTRStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Enable;// 自动输出功能使能??
TIM_BDTRStructure.TIM_Break=TIM_Break_Disable; //失能刹车输入
TIM_BDTRStructure.TIM_BreakPolarity=TIM_BreakPolarity_High; //刹车输入管脚极性高?
TIM_BDTRStructure.TIM_DeadTime=SetTime; //输出打开和关闭状态之间的延时
TIM_BDTRStructure.TIM_LOCKLevel=TIM_LOCKLevel_OFF; // 锁电平参数: 不锁任何位
TIM_BDTRStructure.TIM_OSSIState=TIM_OSSIState_Disable; //设置在空闲模式下非工作状态选项
TIM_BDTRStructure.TIM_OSSRState=TIM_OSSRState_Disable; //设置在运行模式下非工作状态选项
TIM_BDTRConfig(TIM1,&TIM_BDTRStructure);
TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_Cmd(TIM1, DISABLE);//使能TIM1
return arr;
}
void SetPulseNum(u8 PulseNum) //设置脉冲个数
{
TIM1->RCR = PulseNum;
TIM_GenerateEvent(TIM1,TIM_EventSource_Update);
}
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //溢出中断
{
if(StartPWM_Flag) //开始产生PWM波形
{
if(Count1==Tim3Count) //定时间隔产生PWM波形
{
if(FirstEntryFlag!=0) //由于首次是复用模式，所以不用更改模式。
IOModeEnable();
TIM_Cmd(TIM1, ENABLE); //打开定时器1
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); //允许定时器4更新中断
TIM_Cmd(TIM2,ENABLE); //打开定时器4
Count1=0;
FirstEntryFlag=1;
}
else
{
Count1++;
}
}
}
TIM_ClearITPendingBit(TIM3,TIM_IT_Update); //清除中断标志位
}
void TIM2_IRQHandler(void)
{
//定时时间到
if(TIM_GetITStatus(TIM2,TIM_IT_Update)==SET) //溢出中断
{
TIM1->CR1 &= (uint16_t)~TIM_CR1_CEN; //关闭定时器1操作
IOModeDisable(); //IO模式
}
TIM_ClearITPendingBit(TIM2,TIM_IT_Update); //清除中断标志位
}