STM32F0 TIM17配置生成PWM控制步进电机

因为步进电机的转速只跟所给的脉冲数相关，而与占空比无关，所以下面的配置就只考虑脉冲数的变化，对于占空比，则不做多考虑，（占空比=TIM_OCInitStructure.TIM_Pulse/TIM_TimeBaseStructure.TIM_Period，如果在初始化后没生成PWM，可能就是给的参数刚好让这两者的比值为0或1）

/* 参数pulse为输出的脉冲数，在这里不能取0，0不能当除数 */
void Timer17_PWM_Config(u16 pulse){
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    u16 TimerPeriod = (SystemCoreClock / pulse) - 1;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM17, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_5);

    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM17, &TIM_TimeBaseStructure);

    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_Low;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
    TIM_OCInitStructure.TIM_Pulse = 100;
    TIM_OC1Init(TIM17, &TIM_OCInitStructure);

    TIM_Cmd(TIM17, ENABLE);
    /*在TIM1,TIM15,TIM16,TIM17必须使用下面的函数使能，否则无法生成pwm*/
    TIM_CtrlPWMOutputs(TIM17,ENABLE);
}

void main() {
    Timer17_PWM_Config(1000);
    while (1) {
    }
}

如果希望脉冲输出为0，能可以通过修改占空比的方法来处理

/* 下面的寄存器操作就是将TIM_OCInitStructure.TIM_Pulse的值设置为0，从而使占空比为0，也就不再输出脉冲，电机也就不转了 */
void TIM_PWM_Stop()
{
    TIM17->CCR1 = 0;
}