中心对齐波形出不来

1万 · 2019-3-4 13:28

TIM1 PWM
源代码：
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;                         //基本结构体变量定义
TIM_OCInitTypeDef  TIM_OCInitStructure;                   //输出结构体变量定义
TIM_BDTRInitTypeDef  TIM_BDTRInitStructure;                                  //死区刹车结构体变量定义

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

// PA8 9 10 PB 13 14 15 复用
{
      GPIO_InitTypeDef GPIO_InitStructure;

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

      __bic(BIT_16(8)|BIT_16(9)|BIT_16(10), GPIOA->ODR);  //缺省输出

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13 | GPIO_Pin_14| GPIO_Pin_15;
      GPIO_Init(GPIOB,&GPIO_InitStructure);
      __bis(BIT_16(13)|BIT_16(14)|BIT_16(15), GPIOB->ODR);  //缺省输出
}

TIM_DeInit(TIM1);

TIM_TimeBaseStructure.TIM_Prescaler = 0;                                        //TIM基本初始化
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned2;//中央对齐计数模式
TIM_TimeBaseStructure.TIM_Period = 128*2;                                        //PWM 16K
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;                   //TIM输出通道初始化
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse =128;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

TIM_OC1Init(TIM1,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse =128/2;
TIM_OC2Init(TIM1,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse =128/2*3;
TIM_OC3Init(TIM1,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;                   //TIM输出通道4初始化，用来触发AD注入采样
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_Pulse =128;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC4Init(TIM1,&TIM_OCInitStructure);

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;       //死区刹车初始化
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 4;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;       //如打开，开机无输出且状态紊乱？？？？
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;

TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);  //使能捕获比较寄存器预装载（通道1）

TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);       //使能捕获比较寄存器预装载（通道2）

TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);       //使能捕获比较寄存器预装载（通道3）

TIM_SelectInputTrigger(TIM1, TIM_TS_ITR2);       //输入触发源选择TIM3

//TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Trigger);//从模式选择触发

TIM_CtrlPWMOutputs(TIM1,ENABLE);

TIM_Cmd(TIM1,ENABLE);
}