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39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
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class MerlinMessage:
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urdi: int # unsigned 4 bytes (32bit) int 0...2^32
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func: int # unsigned 1 byte int 0...255
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arg: int # unsigned 1 byte int 0...255
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leadingMarker = ord('<')
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trailingMarker = ord('>')
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def __init__(self, urdi, func, arg):
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self.urdi = urdi
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self.func = func
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self.arg = arg
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@classmethod
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def parseRaw(cls, rawData: bytearray) -> 'MerlinMessage':
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if len(rawData) < 8:
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return None
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if rawData[0] != cls.leadingMarker or rawData[-1] != cls.trailingMarker:
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return None
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urdi = int.from_bytes(rawData[1:5], byteorder = 'big')
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func = int(rawData[5])
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arg = int(rawData[6])
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return cls(urdi, func, arg)
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@property
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def rawData(self) -> bytearray:
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msg = bytearray(8)
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msg[0] = self.leadingMarker
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msg[1] = (self.urdi >> 24) & 0xFF
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msg[2] = (self.urdi >> 16) & 0xFF
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msg[3] = (self.urdi >> 8) & 0xFF
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msg[4] = self.urdi & 0xFF
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msg[5] = self.func;
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msg[6] = self.arg;
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msg[7] = self.trailingMarker
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return msg
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