135 lines
2.7 KiB
Python
135 lines
2.7 KiB
Python
# -*- coding: utf-8 -*-
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from machine import Pin, PWM, Timer
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import utime
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class MorseCodeTransmitter:
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"""摩斯码发送器"""
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# 摩斯码本
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MORSECODEBOOK = {
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"A": ".-",
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"B": "-...",
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"C": "-.-.",
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"D": "-..",
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"E": ".",
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"F": "..-.",
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"G": "--.",
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"H": "....",
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"I": "..",
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"J": ".---",
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"K": "-.-",
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"L": ".-..",
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"M": "--",
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"N": "-.",
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"O": "---",
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"P": ".--.",
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"Q": "--.-",
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"R": ".-.",
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"S": "...",
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"T": "-",
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"U": "..-",
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"V": "...-",
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"W": ".--",
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"X": "-..-",
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"Y": "-.--",
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"Z": "--..",
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"0": "-----",
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"1": ".----",
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"2": "..---",
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"3": "...--",
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"4": "....-",
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"5": ".....",
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"6": "-....",
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"7": "--...",
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"8": "---..",
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"9": "----.",
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}
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# 合法字符集
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CHARACTERSALLOWED = set("ABCDEFGHIJKLMNOPQRSTUVWXYZ 0123456789")
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def __init__(self):
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# 单位时距（单位为毫秒）
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self.unit_time_interval = 120
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# 初始化LED
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self.LED = Pin("LED", Pin.OUT, value=0)
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def emit(self, characters: str) -> bool:
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"""发送摩斯码"""
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"""
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:parma characters: 字符串，数据类型为字符
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"""
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# 检查字符串
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if not all(
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character.upper() in self.CHARACTERSALLOWED for character in characters
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):
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print("allowed: a-z, 0-9, space")
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return False
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# 转为大写
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characters = characters.upper()
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print(f"emitting {characters} ...", end="")
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for character in characters:
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# 单词间隔
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if character == " ":
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utime.sleep_ms(self.unit_time_interval * 7)
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continue
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for code in self.MORSECODEBOOK.get(character):
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# 点亮LED
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self.LED.value(1)
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if code == ".":
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utime.sleep_ms(self.unit_time_interval * 1)
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else:
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utime.sleep_ms(self.unit_time_interval * 3)
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# 熄灭LED
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self.LED.value(0)
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# 符号间隔
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utime.sleep_ms(self.unit_time_interval * 1)
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# 字母间隔
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utime.sleep_ms(self.unit_time_interval * 3)
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print("done")
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return True
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def __enter__(self):
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"""支持上下文管理"""
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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"""退出"""
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self.LED.off()
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if __name__ == "__main__":
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with MorseCodeTransmitter() as transmitter:
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result = transmitter.emit(characters="hello world")
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