From 3e70cb0892a703888e913ee5a1545f488a22a4a3 Mon Sep 17 00:00:00 2001 From: Yves Date: Sun, 15 Aug 2010 17:08:36 +0200 Subject: foo --- ebus/model/__init__.py | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 ebus/model/__init__.py (limited to 'ebus/model/__init__.py') diff --git a/ebus/model/__init__.py b/ebus/model/__init__.py new file mode 100644 index 0000000..ecdf3bc --- /dev/null +++ b/ebus/model/__init__.py @@ -0,0 +1,92 @@ +class DataField(object): + def __init__(self, name, offset): + self.name = name + self.offset = offset + def value(self,data): + raise NotImplemented() + + class Data1b(DataField): + """ + Beispiel für die Berechnung: + if ((x & 80h) == 80h) // y negativ + y = - [dez(!x) + 1] + else + y = dez(x) + """ + def value(self,data): + x = ord(data[self.offset]) + if x & 0x80 == 0x80: + return (-1) * (0xff^x + 1) + else: + return x + +class Data1c(DataField): + def value(self,data): + return ord(data[self.offset])/2.0 + +class Data2c(DataField): + """ + Beispiel für die Berechnung: + if ((x & 8000h) == 8000h) // y negativ + y = - [dez(High_Byte(!x)) 16 + dez(High_Nibble (Low_Byte (!x))) + + (dez(Low_Nibble (Low_Byte (!x))) +1 ) / 16] + else // y positiv + y = dez(High_Byte(x)) 16 + dez(High_ Nibble (Low Byte (x))) + + dez(Low_ Nibble (Low Byte (x))) / 16 + """ + def value(self,data): + highByte = ord(data[self.offset+1]) + lowByte= ord(data[self.offset]) + if (0x8000 & (highByte<<8 | lowByte)) == 0x8000: + return (-1) * ( (0xff^highByte)*16 + (0xff^(lowByte>>4)) + (0x0ff^(0xf&lowByte) + 1)/16.0 ) + else: + return highByte*16 + (lowByte>>4) + (lowByte&0xf)/16.0 + +class Data2b(DataField): + """ + if ((x&8000h) == 8000h) // y negativ + y = - [dez(High_Byte(!x)) + (dez(Low_Byte(!x)) + 1) / 256] + else // y positiv + y = dez(High_Byte (x)) + dez(Low_Byte (x)) / 256 + """ + def value(self,data): + highByte = ord(data[self.offset+1]) + lowByte= ord(data[self.offset]) + if (0x8000 & (highByte<<8 | lowByte)) == 0x8000: + return (-1) * ((0xff^highByte) + (0xff^lowByte+1)/256.0) + else: + return highByte + lowByte/256.0 + +class Bit(DataField): + def value(self, data): + return ord(data[self.offset]) == 0x1 + +class Word(DataField): + def value(self, data): + lb, hb = data[self.offset], data[self.offset+1] + return ord(lb) + (ord(hb)<<8) + +class Bcd(DataField): + """ + y = dez(High_Nibble(x))*10 + dez(Low_Nibble(x)) + """ + def value(self, data): + byte = ord(data[self.offset]) + return (byte >> 4) * 10 + (byte & 0xf) + +class Byte(DataField): + def value(self, data): + return ord(data[self.offset]) + + +class ByteEnum(DataField): + def __init__(self, name, offset, values): + fields.DataField.__init__(self, name, offset) + self.values = values + + def value(self, data): + value = ord(data[self.offset]) + if self.values.has_key(value): + return self.values[value] + else: + return None -- cgit v1.2.1