请教一个高级定时器的问题

fairyArm

请教大家一个高级定时器的问题。

[C] 纯文本查看 复制代码

static void TIM1InitP(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_StructInit(&GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);


    TIM_DeInit(TIM1);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  

    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    RCC_ClocksTypeDef  rccClocks;
    RCC_GetClocksFreq(&rccClocks);

    TIM_TimeBaseStructure.TIM_Prescaler = 84; 
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_Period =84-1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(PULSE_0_TIM, &TIM_TimeBaseStructure);

    TIM_OCInitTypeDef  TIM_OCInitStructure;
    TIM_OCStructInit(&TIM_OCInitStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
    TIM_OCInitStructure.TIM_Pulse = (TIM_TimeBaseStructure.TIM_Period+1)/2-1;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCNPolarity_High;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);


    TIM_SelectOnePulseMode(TIM1, TIM_OPMode_Single);
    TIM_Cmd(TIM1,DISABLE);

}

如上图的PWM去驱动 伺服驱动器的时候，发现修改 PSC 和 ARR 的值 并不影响驱动器每分钟的转速。
影响转速的是 RCR。
所以上图中， PSC和ARR，和 RCR 的功用怎么解释？

eric2013

fairyArm

eric2013 发表于 2024-4-11 15:50

谢谢解答！