mpkh 发布的帖子

# This work is licensed under the MIT license.
# Copyright (c) 2013-2023 OpenMV LLC. All rights reserved.
# https://github.com/openmv/openmv/blob/master/LICENSE
#
# Timer Control Example
#
# This example shows how to use a timer for callbacks.

import time,pyb,machine
from pyb import LED,Pin,Timer,PWM


LEDR = LED(1)
LEDG = LED(2)
LEDB = LED(3)

#pwm = PWM(Pin("P7"), freq=50, duty=0)
#pwm.duty(7)

## we will receive the timer object when being called
# Note: 回调函数不允许分配内存
def tick(tim):
    LEDR.toggle()

tim = Timer(14, freq=10) 
tim.callback(tick)  

tim = Timer(4, freq=1000)  # Frequency in Hz.
ch1 = tim.channel(1, Timer.PWM, pin=Pin("P7"), pulse_width_percent=50)

#tim.init(freq=100)
#tim = Timer(2, freq=1000)  # 设置定时器在1000Hz触发
#chA = tim.channel(1, Timer.ENC_A, pin=Pin("P6"))
#chB = tim.channel(4, Timer.ENC_B, pin=Pin("P5"))


# 初始化编码器
#encoder1 = pyb.Encoder(pyb.Pin('P5'), pyb.Pin('P6'))

# 读取编码器的旋转位置
#position1 = encoder1.position()

while True:
    time.sleep_ms(500)
#    LEDB.toggle()

使用machine 导入PWM也会提示同样的问题，IDE版本4.1.5，OpenMV固件版本OpenMV v4.5.3; MicroPython v1.22-omv.r17;

例程方法输出50Hz,可调脉冲在1ms 到2ms,但占空比数值在5-10左右，可调区间太小，使用PWM 16位提示无法加载该PWM模块？
还有就是看了手册说可以读取编码器值，但请问这个操作如和，英文版复制的例程，提示无该模块，导入失败，需要安装还是怎么操作？