Question

求STM32的PWM控制直流电机

Answer 1

void pwm_ARRPreloadConfig(void)
{

PrescalerValue = (uint16_t) (SystemCoreClock /TIM2_rate) - 1; //设定的是定时器的频率，要设定pwm的频率为50hz要乘以对
//应的arr值
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; //TIM_Prescaler 设置了用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_Period = PWM_ARR; //设置了在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); //pwm3已经调好可以用 PB0
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable); //pwm4已经调好可以用 PB1
TIM_ARRPreloadConfig(TIM2, ENABLE);

TIM_Cmd(TIM2, ENABLE);
}

Answer 2

哈哈，改暂空比呗，pwm配置中都有的，我之前是用系统滴答定时器不断改变pwm初值，然后调用函数重新配置pwm。既然搞定了，分就给我吧！

Answer 3

加个开关电路就行了,如果要正反转加个H桥,简单

Answer 4

STM32是什么意思？？