stm32通过串口修改PWM波形的频率、占空比、周期的代码

上传者: 41834692 | 上传时间: 2024-01-21 04:26:15 | 文件大小: 17.49MB | 文件类型: ZIP
STM32的PWM波动态调频和调占空比的原理: 1、调节占空比:只要根据设置的TIMx_ARR寄存器的值和所需要的占空比设置TIMx_CCRx寄存器的值即可。例如:TIMx_ARR的值为100,需要占空比为50%,则设置TIMx_CCRx的值为50即可。 2、调频: ①更改预分频器的值,改变计数器的频率 1.频率: PWM的频率 = 时钟频率 / (自动重装载值 + 1) * (预分频值 + 1) TIM1最大时钟频率为72MHZ = 72 000 000 HZ 通过修改Psc和Arr可以输出不同频率的PWM输出 2.占空比 使用函数 TIM_SetComparex(TIM_TypeDef* TIMx, uint16_t Comparex) Compare1(CH1)是用于与TIMx比较的数,相当于用TIMx的一个周期的时间减去这个Compare1,使得TIMx的周期从后面开始的Compare1的时间为TIMx的前部分时间的反向。即若前部分时间为高电平,则Compare1段所在时间为低电平。若前部分时间为低电平,则Compare1段所在时间为高电平。

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