PWM 的使用

关于 PWM 详细介绍请参考PWM-API 文档.

1. 使用方法

  • 从 machine 导入 PWM, Timer 模块
from machine import Timer,PWM
  • 创建 Timer 和 PWM
tim = Timer(Timer.TIMER0, Timer.CHANNEL0, mode=Timer.MODE_PWM)
ch = PWM(tim, freq=500000, duty=50, pin=boad_info.LED_G)
  • 改变占空比, 设置的 pin 脚将输出不同占空比的波形
ch.duty(duty)

2. 示例

控制 LED_G 灯亮度

from machine import Timer,PWM
import time
from board import board_info
from fpioa_manager import fm

tim = Timer(Timer.TIMER0, Timer.CHANNEL0, mode=Timer.MODE_PWM)
ch = PWM(tim, freq=500000, duty=50, pin=boad_info.LED_G)
duty=0
dir = True
while True:
    if dir:
        duty += 10
    else:
        duty -= 10
    if duty>100:
        duty = 100
        dir = False
    elif duty<0:
        duty = 0
        dir = True
    time.sleep(0.05)
    ch.duty(duty)
powered by GitbookFile Modify: 2021-01-23 16:30:41

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