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import struct
class XSVFParser(object):
def __init__(self):
self._handlers = {
0x00: self.XCOMPLETE ,
0x01: self.XTDOMASK ,
0x02: self.XSIR ,
0x03: self.XSDR ,
0x04: self.XRUNTEST ,
0x07: self.XREPEAT ,
0x08: self.XSDRSIZE ,
0x09: self.XSDRTDO ,
0x0a: self.XSETSDRMASKS,
0x0b: self.XSDRINC ,
0x0c: self.XSDRB ,
0x0d: self.XSDRC ,
0x0e: self.XSDRE ,
0x0f: self.XSDRTDOB ,
0x10: self.XSDRTDOC ,
0x11: self.XSDRTDOE ,
0x12: self.XSTATE ,
0x13: self.XENDIR ,
0x14: self.XENDDR ,
0x15: self.XSIR2 ,
0x16: self.XCOMMENT ,
0x17: self.XWAIT ,
}
def tdomask(self):
return self._xtdomask
def read_byte(self):
return self.read_bytes(1)[0]
def read_bytes(self, n):
c = self._f.read(n)
if len(c) == n:
return c
else:
raise RuntimeError('unexpected end of file')
def read_bits(self, n):
length_bytes = (n + 7) >> 3
return self.read_bytes(length_bytes)
def read_u32(self):
return struct.unpack('>I', self.read_bytes(4))[0]
def parse(self, f, debug=False):
self._f = f
self._debug = debug
self._xcomplete = False
self._xenddr = None
self._xendir = None
self._xruntest = 0
self._xsdrsize = None
self._xtdomask = None
self._commands = []
while self._xcomplete == False:
self.read_instruction()
self._f = None
return self._commands
def read_instruction(self):
instruction_id = self.read_byte()
if instruction_id in self._handlers:
instruction_handler = self._handlers[instruction_id]
result = instruction_handler()
if result is not None:
self._commands.append(result)
else:
raise RuntimeError('unexpected instruction 0x%02x' % instruction_id)
def XCOMPLETE(self):
self._xcomplete = True
def XTDOMASK(self):
length_bits = self._xsdrsize
self._xtdomask = self.read_bits(length_bits)
def XSIR(self):
length_bits = self.read_byte()
tdi = self.read_bits(length_bits)
if self._debug:
print('XSIR tdi=%d:%s' % (length_bits, tdi.hex()))
return {
'type': 'xsir',
'tdi': {
'length': length_bits,
'data': tdi
},
}
def XSDR(self):
length_bits = self._xsdrsize
tdi = self.read_bits(length_bits)
if self._debug:
print('XSDR tdi=%d:%s' % (length_bits, tdi.hex()))
return {
'type': 'xsdr',
'tdi': {
'length': length_bits,
'data': tdi,
},
}
def XRUNTEST(self):
self._xruntest = self.read_u32()
if self._debug:
print('XRUNTEST number=%d' % self._xruntest)
def XREPEAT(self):
repeat = self.read_byte()
# print('XREPEAT times=%d' % repeat)
def XSDRSIZE(self):
self._xsdrsize = self.read_u32()
def XSDRTDO(self):
length_bits = self._xsdrsize
tdi = self.read_bits(length_bits)
tdo_mask = self._xtdomask
self._tdo_expected = (length_bits, self.read_bits(length_bits))
wait = self._xruntest
if wait == 0:
end_state = self._xenddr
else:
end_state = 1 # Run-Test/Idle
if self._debug:
print('XSDRTDO tdi=%d:%s tdo_mask=%d:%s tdo_expected=%d:%s end_state=%u wait=%u' % (
length_bits, tdi.hex(),
length_bits, tdo_mask.hex(),
self._tdo_expected[0], self._tdo_expected[1].hex(),
end_state,
wait,
))
return {
'type': 'xsdrtdo',
'tdi': {
'length': length_bits,
'data': tdi
},
'tdo_mask': {
'length': length_bits,
'data': tdo_mask,
},
'tdo_expected': {
'length': self._tdo_expected[0],
'data': self._tdo_expected[1],
},
'end_state': end_state,
'wait': wait,
}
def XSETSDRMASKS(self):
raise RuntimeError('unimplemented')
def XSDRINC(self):
raise RuntimeError('unimplemented')
def XSDRB(self):
raise RuntimeError('unimplemented')
def XSDRC(self):
raise RuntimeError('unimplemented')
def XSDRE(self):
raise RuntimeError('unimplemented')
def XSDRTDOB(self):
raise RuntimeError('unimplemented')
def XSDRTDOC(self):
raise RuntimeError('unimplemented')
def XSDRTDOE(self):
raise RuntimeError('unimplemented')
def XSTATE(self):
state = self.read_byte()
if self._debug:
print('XSTATE %u' % state)
return {
'type': 'xstate',
'state': state,
}
def XENDIR(self):
self._xendir = self.read_byte()
def XENDDR(self):
self._xenddr = self.read_byte()
def XSIR2(self):
raise RuntimeError('unimplemented')
def XCOMMENT(self):
raise RuntimeError('unimplemented')
def XWAIT(self):
wait_state = self.read_byte()
end_state = self.read_byte()
wait_time = self.read_u32()
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