Mercurial > avr_jtag

annotate py_avrjtag/cmd_proto.py @ 12:68ecd42850d3

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Start shifting when TAP transiting from CAP to SHIFT states. - It assumes last bit is shifted when transiting from SHIFT states to EXIT1.
author Thinker K.F. Li <thinker@branda.to>
date Tue, 24 Feb 2009 18:53:16 +0800
parents cc106f278d7d
children
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
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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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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61f27549de57 Support TRST.
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7 CPCMD_TRST = 5
61f27549de57 Support TRST.
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8 CPCMD_PONG = 6
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9 CPCMD_DATA = 7
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10 CPCMD_ACK = 8
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11 CPCMD_NAK = 9
4
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12
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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13 def csum_add(csum, c):
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14 return (((csum << 3) | (csum >> 5)) ^ c) & 0xff
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15
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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16 class cmd(object):
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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17 OFF_SEQ = 2
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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18 OFF_DSZ = 3
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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19 OFF_CODE = 4
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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20 FRAME_OVERHEAD = 5
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21
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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22 def __init__(self, seq=0, code=0, data=''):
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cc106f278d7d Get identify of components
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23 if len(data) >= 255:
cc106f278d7d Get identify of components
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24 raise ValueError, 'data length (%d) >= 255' % (len(data))
4
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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25 self.seq = seq
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26 self.code = code
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27 self.data = data
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28 pass
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29
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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30 def to_frame(self):
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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31 csum = 0
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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32 csum = csum_add(0, self.code)
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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33 for c in self.data:
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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34 csum = csum_add(csum, ord(c))
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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35 pass
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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36 csum = csum_add(csum, 0)
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37
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38 frame = struct.pack('BBBBB', ord('J'), ord('C'), self.seq,
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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39 len(self.data) + 1, self.code)
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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40 frame = frame + self.data + chr(csum)
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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41 return frame
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42
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43 def from_frame(self, frame):
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44 if frame[:2] != 'JC':
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45 return -1
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46
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47 csum = 0
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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48 for c in frame[self.OFF_CODE:]:
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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49 csum = csum_add(csum, ord(c))
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50 pass
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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51 if csum:
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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52 return -1
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53
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54 data_sz = ord(frame[self.OFF_DSZ])
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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55 if data_sz != (len(frame) - self.FRAME_OVERHEAD):
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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56 return -1
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57
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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58 if not data_sz:
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59 return -1
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60
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61 self.seq = ord(frame[self.OFF_SEQ])
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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62 self.code = ord(frame[self.OFF_CODE])
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63 self.data = frame[self.OFF_CODE + 1:-1]
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64 pass
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65
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66 def __repr__(self):
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67 return '<%s {seq: %d, code: %d, data: %s}>' % \
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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68 (self.__class__.__name__, self.seq, self.code, repr(self.data))
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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69 pass
6b1594fb668f Improve performance of jtag.c and test it with Python scripts.
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70
8
074e860d7d31 jtagdev is a desktop client to communicate with jtag device through Arduino.
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71 def prepend_nbits(nbits, data):
074e860d7d31 jtagdev is a desktop client to communicate with jtag device through Arduino.
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72 r = chr(nbits & 0xff) + chr(nbits >> 8) + data
074e860d7d31 jtagdev is a desktop client to communicate with jtag device through Arduino.
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73 return r