Mercurial > templog
annotate server/ts.py @ 332:05c1249da994
- Move crc16 to utils and fix it
- Fix main.c crc calculation
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 07 Jun 2012 20:26:50 +0800 |
parents | 5de3fc71ce48 |
children | dbbd503119ba |
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1 #!/usr/bin/env python2.7 |
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2 |
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3 BTADDR = "00:12:03:27:70:88" |
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4 SLEEP_TIME = 180 |
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5 # time that the bluetooth takes to get going? |
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6 EXTRA_WAKEUP = 0 |
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7 |
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8 FETCH_TRIES = 3 |
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9 |
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10 # avoid turning off the bluetooth etc. |
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11 TESTING = True |
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12 |
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13 import sys |
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14 #import httplib |
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15 import time |
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16 import traceback |
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17 |
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18 from utils import monotonic_time, retry, readline, crc16 |
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19 |
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20 lightblue = None |
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21 try: |
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22 import lightblue |
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23 except ImportError: |
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24 import bluetooth |
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25 |
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26 def get_socket(addr): |
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27 if lightblue: |
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28 s = lightblue.socket() |
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29 s.connect((addr, 1)) |
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30 s.settimeout(3) |
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31 else: |
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32 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM ) |
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33 s.connect((addr, 1)) |
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34 |
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35 s.setblocking(False) |
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36 |
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37 return s |
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38 |
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39 |
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40 @retry() |
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41 def fetch(sock): |
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42 print "fetch" |
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43 sock.send("fetch\n") |
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44 |
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45 crc = 0 |
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46 |
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47 lines = [] |
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48 l = readline(sock) |
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49 if l != 'START\n': |
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50 print>>sys.stderr, "Bad expected START line '%s'\n" % l.rstrip('\n') |
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51 return None |
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52 crc = crc16(l, crc) |
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53 lines.append(l) |
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54 |
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55 while True: |
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56 l = readline(sock) |
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57 |
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58 crc = crc16(l, crc) |
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59 |
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60 if l == 'END\n': |
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61 break |
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62 |
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63 lines.append(l) |
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64 |
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65 print lines |
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66 |
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67 l = readline(sock) |
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68 recv_crc = None |
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69 try: |
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70 k, v = l.rstrip('\n').split('=') |
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71 print k,v |
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72 if k == 'CRC': |
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73 recv_crc = int(v) |
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74 if recv_crc < 0 or recv_crc > 0xffff: |
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75 recv_crc = None |
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76 except ValueError: |
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77 pass |
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78 |
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79 if recv_crc is None: |
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80 print>>sys.stderr, "Bad expected CRC line '%s'\n" % l.rstrip('\n') |
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81 return None |
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82 |
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83 if recv_crc != crc: |
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84 print>>sys.stderr, "Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc) |
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85 return None |
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86 |
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87 return ''.join(lines) |
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88 |
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89 @retry() |
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90 def turn_off(sock): |
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91 if TESTING: |
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92 return None |
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93 sock.send("btoff\n"); |
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94 # read newline |
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95 l = readline(sock) |
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96 if not l: |
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97 print>>sys.stderr, "Bad response to btoff\n" |
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98 return None |
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99 |
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100 off, next_wake = l.rstrip().split(':') |
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101 if off != 'Off': |
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102 print>>sys.stderr, "Bad response to btoff '%s'\n" % l |
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103 |
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104 return int(next_wake) |
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105 |
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106 def do_comms(sock): |
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107 print "do_comms" |
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108 d = None |
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109 # serial could be unreliable, try a few times |
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110 for i in range(FETCH_TRIES): |
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111 d = fetch(sock) |
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112 if d: |
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113 break |
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114 time.sleep(1) |
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115 if not d: |
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116 return |
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117 |
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118 res = send_results() |
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119 if not res: |
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120 return |
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121 |
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122 clear_meas(sock) |
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123 |
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124 next_wake = turn_off(sock) |
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125 sock.close() |
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126 return next_wake |
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127 |
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128 testcount = 0 |
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129 |
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130 def sleep_for(secs): |
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131 until = monotonic_time() + secs |
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132 while True: |
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133 length = until - monotonic_time() |
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134 if length <= 0: |
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135 return |
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136 time.sleep(length) |
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137 |
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138 def main(): |
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139 |
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140 while True: |
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141 sock = None |
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142 try: |
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143 sock = get_socket(BTADDR) |
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144 except Exception, e: |
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145 print>>sys.stderr, "Error connecting:" |
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146 traceback.print_exc(file=sys.stderr) |
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147 sleep_time = SLEEP_TIME |
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148 if sock: |
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149 next_wake = None |
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150 try: |
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151 next_wake = do_comms(sock) |
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152 except Exception, e: |
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153 print>>sys.stderr, "Error in do_comms:" |
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154 traceback.print_exc(file=sys.stderr) |
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155 if next_wake: |
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156 sleep_time = min(next_wake+EXTRA_WAKEUP, sleep_time) |
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157 |
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158 if TESTING: |
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159 print "Sleeping for %d" % sleep_time |
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160 sleep_for(sleep_time) |
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161 |
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162 if __name__ == '__main__': |
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163 main() |