新手求助，想用pwm主从模式生成相位，频率，占空比可调的2个波

1148168526 · 发表于 2022-11-24 12:53:00

网上找了个资料，相位没变化，求助求助！
网上代码如下：
void TIM3_PWMShiftInit(void)
{
   TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStruct;
GPIO_InitTypeDef  GPIO_InitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;

/**********************TIM3 GPIO配置*****************************/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_13;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB,&GPIO_InitStruct);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIOA,&GPIO_InitStruct);

/**********************初始化TimBase结构体*************************/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); //开启TIM时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1; //定时器不分频
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = 1799;    //频率 = 72000000/PSC/(ARR+1) = 40KHz
TIM_TimeBaseInitStruct.TIM_Prescaler = 0;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);
/**********************初始化TIM3 OC结构体*************************/
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 600;                //TIM3 CH3占空比：600/（ARR+1）=33.3%
TIM_OC3Init(TIM3,&TIM_OCInitStruct);

//TIM1 CH1pwm输出配置
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStruct.TIM_Pulse=600;                //TIM1 CH1占空比：600/（ARR+1）=33.3%
TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_Low;       //设置输出极性
TIM_OCInitStruct.TIM_OutputNState=TIM_OutputNState_Disable;//禁止互补端输出,缺失此语句无法调节输出极性
TIM_OC1Init(TIM1,&TIM_OCInitStruct);

/**************************配置移相触发**************************/
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2;  //PWM2与Toggle模式可触发移相，其他模式不可
TIM_OCInitStruct.TIM_Pulse = 600-2;          //约需2个定时器周期触发，移相：360*600/(ARR+2)= 120度
TIM_OC2Init(TIM1,&TIM_OCInitStruct);          //需要CH2上升沿触发如果无法触发移相请更改CH2输出极性

/**************************配置主从模式*************************/
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_OC2Ref);  //TIM1 OC2触发从定时器
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);

TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0);    //ITRO触发
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Trigger);

TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);             //高级定时器pwm输出使能，一定要记得打开

}