Mercurial > avr_jtag
comparison py_avrjtag/cp_tditdo.py @ 4:6b1594fb668f
Improve performance of jtag.c and test it with Python scripts.
- cp_tditdo.py send bits to TDI and hope it will feed back from TDO.
- Expand loops in jtag.c to improve performance.
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Sun, 22 Feb 2009 12:54:45 +0800 |
| parents | |
| children |
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| 3:e410832c3280 | 4:6b1594fb668f |
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| 1 import cmd_proto | |
| 2 | |
| 3 def cp_tms(seq, nbits, data): | |
| 4 nbits_bytes = chr(nbits & 0xff) + chr(nbits >> 8) | |
| 5 cmd = cmd_proto.cmd(seq, cmd_proto.CPCMD_SHIFT_TDI_TDO, | |
| 6 nbits_bytes + data) | |
| 7 frame = cmd.to_frame() | |
| 8 return frame | |
| 9 | |
| 10 def get_reply(fo): | |
| 11 import fcntl, os | |
| 12 import time | |
| 13 | |
| 14 reply = '' | |
| 15 fcntl.fcntl(fo.fileno(), fcntl.F_SETFL, os.O_NONBLOCK) | |
| 16 while True: | |
| 17 try: | |
| 18 s = os.read(fo.fileno(), 256) | |
| 19 except OSError: | |
| 20 time.sleep(0.13) | |
| 21 try: | |
| 22 s = os.read(fo.fileno(), 256) | |
| 23 except OSError: | |
| 24 break | |
| 25 pass | |
| 26 reply = reply + s | |
| 27 pass | |
| 28 return reply | |
| 29 | |
| 30 if __name__ == '__main__': | |
| 31 import sys | |
| 32 | |
| 33 if len(sys.argv) != 2: | |
| 34 print >> sys.stderr, 'Usage: prog <port device>' | |
| 35 sys.exit(1) | |
| 36 pass | |
| 37 | |
| 38 port = sys.argv[1] | |
| 39 | |
| 40 fo = open(port, 'r+b') | |
| 41 cmd_str = cp_tms(12, 37, 'hello') | |
| 42 fo.write(cmd_str) | |
| 43 fo.flush() | |
| 44 | |
| 45 frame = get_reply(fo) | |
| 46 cmd = cmd_proto.cmd() | |
| 47 r = cmd.from_frame(frame) | |
| 48 if r: | |
| 49 print 'frame error %s' % (repr(frame)) | |
| 50 else: | |
| 51 print repr(cmd) | |
| 52 pass | |
| 53 pass | |
| 54 |