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import struct
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def reorderBytes(byteStream, format):
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if format == 'ABCD':
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return byteStream
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elif format == 'DCBA':
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return byteStream[::-1]
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elif format == 'BADC':
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return bytes([byteStream[1], byteStream[0], byteStream[3], byteStream[2]])
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elif format == 'CDAB':
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return bytes([byteStream[2], byteStream[3], byteStream[0], byteStream[1]])
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else:
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raise ValueError("Invalid format")
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# 大端模式
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def floatToABCD(value):
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valueByte = struct.unpack('>HH',struct.pack('>f', value))
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return valueByte
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# 小端模式
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def floatToDCBA(value):
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valueByte = struct.unpack('>HH', struct.pack('<f', value))
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return valueByte
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# 单字反转
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def floatToBADC(value):
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valueByte = struct.unpack('<HH', struct.pack('>f', value))
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return valueByte
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# 双字反转
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def floatToCDAB(value):
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valueByte = struct.unpack('<HH', struct.pack('<f', value))
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return valueByte
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def ABCDToFloat(value):
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valueByte = struct.unpack('>f',struct.pack('>HH', value[0], value[1]))
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return valueByte[0]
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# 小端模式
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def DCBAToFloat(value):
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valueByte = struct.unpack('<f', struct.pack('>HH', value[0], value[1]))
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return valueByte[0]
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def BADCToFloat(value):
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valueByte = struct.unpack('>f', struct.pack('<HH', value[0], value[1]))
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return valueByte[0]
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def CDABToFloat(value):
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valueByte = struct.unpack('<f', struct.pack('<HH', value[0], value[1]))
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return valueByte[0]
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def floatToBytes(values, length, order):
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# 判断order是否为ABCD或BADC
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# order = '>' if order in ['ABCD', 'BADC'] else '<'
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# hOrder = '<'if order.byte in ['ABCD', 'DCBA'] else '>'
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# 获取values的长度
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valuesNums = len(values)
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# 将values转换为字节流
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valueByte = struct.pack(f"!{'f' * valuesNums}", *values)
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valueByte = reorderBytes(valueByte, format = order)
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print(ABCDToFloat(struct.unpack('!HH', valueByte)))
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# {'B' * (length - 4 * valuesNums) *[0] * (length - 4 * valuesNums)
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# 返回转换后的字节流
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# return valueByte
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def coilsToBytes(values, length):
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decimalNumbers = []
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binaryNumber = ''.join([str(x) for x in list(reversed(values))])
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zeroNeeded = 0 if len(binaryNumber) % 8 == 0 else 8 - (len(binaryNumber) % 8)
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binaryNumber = '0' * zeroNeeded + binaryNumber
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for i in range(0, len(binaryNumber), 8):
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eightValues = binaryNumber[i:i+8]
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decimalNumbers.append(int(eightValues, 2))
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valueByte = struct.pack("B" * length, *decimalNumbers, *[0] * (length - len(decimalNumbers)))
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return valueByte
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# print(coilsToBytes([1] * 2, 3))
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floatToBytes([3.14], 5, 'ABCD')
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