S7 -> IRC5 GI/GO conversions

S7conversions.py

"""
No need for little / big endian byte swapping
this is already done by the group input/output ordening

GI.. expect byte array
..GI return byte array
"""

import struct 

def GIToFloat(gi):
    xx = gi.to_bytes(4, 'little')
    return struct.unpack('f', xx)[0]

def FloatToGO(f):
    xx = struct.pack('f', f)
    return int.from_bytes(xx, 'little')

def GIToInt16(gi):
    return int.from_bytes(gi, 'little')

def Int16ToGO(int16):
    return int16.to_bytes(2, 'little')

def GIToInt32(gi):
    return int.from_bytes(gi, 'little')

def Int32ToGO(int32):
    return int32.to_bytes(4, 'little')


if __name__ == '__main__':
    print('\n')

    GI = b'\x00\x00\xa0B'
    x = GIToFloat(GI)
    print("GI -> Float: %s -> %f" % (GI, x))
    GO = FloatToGO(x)
    print("Float -> GO: %f -> %s" % (x, GO))
    
    GI = b'\x00\x00\xa0B'
    x = GIToInt32(GI)
    print("DWord -> Int32: %s -> %d" % (GI, x))
    GO = Int32ToGO(x)
    print("Int32 -> DWord: %d -> %s" % (x, GO))

    GI = b'\xa0B'
    x = GIToInt16(GI)
    print("Word -> Int16: %s -> %d" % (GI, x))
    GO = Int16ToGO(x)
    print("Int16 -> Word: %d -> %s" % (x, GO))
    print('\n')