Mercurial > avr_jtag

annotate py_avrjtag/cmd_proto.py @ 5:eb14cac68cbb

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Transite TAP controller to shift state. - shift commands will transite state machine of TAP controller to shift state before starting shifting.
author Thinker K.F. Li <thinker@branda.to>
date Sun, 22 Feb 2009 13:55:50 +0800
parents 6b1594fb668f
children 61f27549de57
rev   line source
4
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
Thinker K.F. Li <thinker@branda.to>
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1 import struct
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2
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3 CPCMD_PING = 1
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4 CPCMD_SHIFT_TDI = 2
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5 CPCMD_SHIFT_TMS = 3
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6 CPCMD_SHIFT_TDI_TDO = 4
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7 CPCMD_PONG = 5
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8 CPCMD_DATA = 6
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9 CPCMD_ACK = 7
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10 CPCMD_NAK = 8
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11
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12 def csum_add(csum, c):
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13 return (((csum << 3) | (csum >> 5)) ^ c) & 0xff
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14
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15 class cmd(object):
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16 OFF_SEQ = 2
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17 OFF_DSZ = 3
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18 OFF_CODE = 4
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19 FRAME_OVERHEAD = 5
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20
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21 def __init__(self, seq=0, code=0, data=''):
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22 self.seq = seq
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23 self.code = code
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24 self.data = data
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25 pass
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26
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27 def to_frame(self):
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28 csum = 0
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29 csum = csum_add(0, self.code)
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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30 for c in self.data:
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31 csum = csum_add(csum, ord(c))
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32 pass
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33 csum = csum_add(csum, 0)
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34
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35 frame = struct.pack('BBBBB', ord('J'), ord('C'), self.seq,
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36 len(self.data) + 1, self.code)
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37 frame = frame + self.data + chr(csum)
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38 return frame
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39
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40 def from_frame(self, frame):
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41 if frame[:2] != 'JC':
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42 return -1
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43
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44 csum = 0
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45 for c in frame[self.OFF_CODE:]:
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46 csum = csum_add(csum, ord(c))
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47 pass
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48 if csum:
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49 return -1
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50
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51 data_sz = ord(frame[self.OFF_DSZ])
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52 if data_sz != (len(frame) - self.FRAME_OVERHEAD):
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53 return -1
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54
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55 if not data_sz:
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56 return -1
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57
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58 self.seq = ord(frame[self.OFF_SEQ])
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59 self.code = ord(frame[self.OFF_CODE])
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60 self.data = frame[self.OFF_CODE + 1:-1]
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61 pass
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62
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63 def __repr__(self):
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64 return '<%s {seq: %d, code: %d, data: %s}>' % \
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65 (self.__class__.__name__, self.seq, self.code, repr(self.data))
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66 pass
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67