HP3562A/__init__.py

Mon, 04 Feb 2008 19:49:48 +0100

author
David Douard <david.douard@logilab.fr>
date
Mon, 04 Feb 2008 19:49:48 +0100
changeset 39
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permissions
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1 """
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2 HP3562A
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3 =======
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4
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5 Module for communicating with the HP 3562A Digital Signal Analyzer.
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6
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7 Subpackages
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8 -----------
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9
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10
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11 Constants
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12 ---------
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13
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14 """
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15 import struct
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16 import re
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17 import pygpib as gpib
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18 import numpy
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19
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20 ########################################
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21 # HP3562A internal binary types decoders
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22
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23 def decode_float(s):
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24 if len(s) == 4:
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25 i1, i2, e = struct.unpack('>hbb', s)
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26 i2 = i2 * 2**(-23)
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27 return (i1/32768. + i2)*2**e
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28 else:
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29 i1, i2, i3, i4, e = struct.unpack('>hhhbb', s)
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30 if i2 < 0:
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31 i2 = (i2+32768.)*2**(-15)
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32 else:
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33 i2 = i2*2**(-15)
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34 if i3 < 0:
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35 i3 = (i3+32768.)*2**(-30)
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36 else:
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37 i3 = i3*2**(-15)
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38 i4 = i4 * 2**(-38)
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39 return (i1+i2+i3+i4)*2**(e-15)
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40
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41 # def decode_float(s):
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42 # assert len(s) in [4,8]
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43 # # exponential term
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44 # e = ord(s[-1])
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45 # if e & 0x80:
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46 # e = e - 256
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47
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48 # # mantissa
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49 # m = [ord(x) for x in s[:-1]]
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50 # M = 0.
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51 # for i in range(len(s)-1):
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52 # #M += m[i]<<(i*8)
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53 # M += float(m[i])/2**((i+1)*8)
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54 # # XXX how do we deal negative numbers?
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55 # #if m[0] & 0x80:
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56 # # M = M - 2^(len(s))
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57 # return M * 2**(e+1)
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58
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59 def decode_string(s):
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60 nb = ord(s[0])
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61 s = s[1:nb+2]
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62 r = ""
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63 # XXX why do we need to do this? It's not described in the manual...
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64 for c in s:
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65 r += chr(ord(c) & 0x7F)
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66 return r
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67
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68
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69 ###
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70 # Some useful functions
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71 def format_header(header, head_struct, columns=80):
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72 """
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73 Pretty print a data block (trace, state or coord)
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74 """
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75 bool_re = re.compile(r'((?P<before>.*) )?(?P<flag>\w+/\w+)( (?P<after>.*))?')
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76
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77 todisp = []
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78 for row in head_struct:
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79 key = row[0]
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80 typ = row[1]
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81 if typ is None:
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82 continue
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83 val = header.get(key, "N/A")
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84 if isinstance(val, basestring):
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85 val = repr(val)
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86 elif typ is bool and isinstance(val, typ):
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87 m = bool_re.match(key)
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88 if m:
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89 d = m.groupdict()
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90 key = ""
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91 if d['before']:
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92 key += d['before']
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93 if d['after']:
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94 key += d['after']
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95 key = key.capitalize()
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96 val = d['flag'].split('/')[not val]
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97 else:
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98 val = str(val)
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99 else:
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100 val = str(val)
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101 todisp.append((key+":", val))
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102 maxk = max([len(k) for k, v in todisp])
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103 maxv = max([len(v) for k, v in todisp])
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104 fmt = "%%-%ds %%-%ds"%(maxk, maxv)
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105 w = maxk+maxv+4
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106 ncols = columns/w
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107 if ncols:
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108 nrows = len(todisp)/ncols
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109 else:
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110 nrows = len(todisp)
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111 res = ""
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112 for i in range(nrows):
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113 res += "| ".join([fmt%todisp[j*nrows+i] for j in range(ncols)]) + "\n"
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114 return res
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115
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116 def decode_header(data, header_struct, idx=0):
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117 d = data
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118 if d[idx:].startswith('#'):
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119 # we have a preliminary header here...
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120 typ = d[idx:idx+2]
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121 assert typ == "#A"
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122 idx += 2
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123 totlen = struct.unpack('>h', d[idx:idx+2])[0]
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124 idx += 2
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125 tt=0
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126 header = {}
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127 for i, (nam, dtype, fmt, nbytes) in enumerate(header_struct):
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128 if dtype is None:
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129 idx += nbytes
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130 continue
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131 elif dtype == str:
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132 val = decode_string(d[idx:])
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133 else:
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134 if fmt:
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135 v = struct.unpack('>'+fmt, d[idx: idx+nbytes])[0]
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136 if isinstance(dtype, dict):
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137 val = dtype.get(int(v), "N/A")
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138 else:
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139 val = dtype(v)
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140 else:
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141 val = dtype(d[idx: idx+nbytes])
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142 header[nam] = val
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143 idx += nbytes
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144 return header, idx
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145
16
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146 def read_trace(data, idx, nelts):
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147 assert len(data[idx:]) >= (nelts*4), "data[idx:] is too small (%s for %s)"%(len(data[idx:]), (nelts*4))
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148 resu = []
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149 for i in range(nelts):
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150 resu.append(decode_float(data[idx: idx+4]))
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151 idx += 4
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152 return numpy.array(resu, dtype=float)
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153
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154 #####################
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155 # HP3562A constants
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156
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157 # GPIB buffer size is 3x80 characters lines
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158 class STATUS_BYTE(gpib.Constants):
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159 # HP3562A Status Byte, as returned by a serial poll
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160 _constants = [(0x40, "RQS", "Request Service"), # when sent in response to a serial poll
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161 (0x20, "ERR", "GPIB error"),
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162 (0x10, "RDY", "ready to accept GPIB commands"),
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163 ]
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164
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165 conditions = [(0, "NSR", "No service requested"),
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166 (1, "USRQ1", "User SRQ #1"),
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167 (2, "USRQ1", "User SRQ #2"),
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168 (3, "USRQ1", "User SRQ #3"),
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169 (4, "USRQ1", "User SRQ #4"),
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170 (5, "USRQ1", "User SRQ #5"),
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171 (6, "USRQ1", "User SRQ #6"),
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172 (7, "USRQ1", "User SRQ #7"),
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173 (8, "USRQ1", "User SRQ #8"),
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174 (9, "EOD", "End of disk action"),
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175 (10, "EOP", "End of plot action"),
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176 (11, "STCH", "Instrument status changed"), # any change in
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177 # the status register sets this condition
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178 (12, "PWR", "Power on"),
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179 (13, "KEY", "Key pressed"),
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180 (14, "DCP", "Device clear plotter (listen)"),
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181 # ...
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182 ]
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183 def __init__(self):
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184 super(STATUS_BYTE, self).__init__()
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185 self._conditions = dict([(x[0], x[1]) for x in self.conditions])
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186 self._rev_conditions = dict([(x[1], x[0]) for x in self.conditions])
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187 self._long_conditions = dict([(x[0], x[2]) for x in self.conditions])
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188
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189 def byte_condition(self, byte):
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190 byte = byte & 0x8F
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191 return self._conditions.get(byte, "N/A")
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192
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193 class IS_REGISTER(gpib.Constants):
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194 _constants = [(0x01, "MEASP", "measeurement pause"),
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195 (0x02, "ASQP", "Auto sequence pause"),
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196 (0X04, "EOM", "End of measurement, capture or throughput"),
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197 (0x08, "EOAS", "End of auto sequence"),
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198 (0x10, "SWPR", "Sweep point ready"),
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199 (0x20, "CH1OV", "Channel 1 overrange"),
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200 (0x40, "CH2OV", "Channel 2 overrange"),
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201 (0X80, "CH1HR", "Channel 1 half range"),
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202 (0x100, "CH2HR", "Channel 2 half range"),
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203 (0x200, "SFALT", "Source falt"),
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204 (0x400, "RUNL", "Reference unlock"),
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205 (0x800, "RMKT", "Remote marker knob turn"),
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206 (0x1000, "REKT", "Remote entry knob turn"),
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207 (0x2000, "ASRC", "Asctive Status Register changed"),
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208 (0x4000, "PWRF", "Power-on test failed"),
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209 ]
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210
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211 class StatusQuery(gpib.Constants):
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212 _command = "STA?"
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213 _constants = [(0x01, "N/A", "Not used"),
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214 (0x02, "N/A", "Not used"),
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215 (0x04, "KEY", "Key pressed"),
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216 (0x08, "N/A", "Not used"),
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217 (0x10, "RDY", "Ready"),
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218 (0x20, "ERR", "Error"),
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219 (0x40, "RQS", "Request"),
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220 (0x80, "MOS", "Message on screen"),
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221 (0x100, "MEASP", "measeurement pause"),
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222 (0x200, "ASQP", "Auto sequence pause"),
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223 (0X400, "EOM", "End of measurement, capture or throughput"),
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224 (0x800, "EOAS", "End of auto sequence"),
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225 (0x1000, "SWPR", "Sweep point ready"),
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226 (0x2000, "CH1OV", "Channel 1 overrange"),
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227 (0x4000, "CH2OV", "Channel 2 overrange"),
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228 (0x8000, "MAOV", "Math overflow"),
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229 ]
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230 class ActivityStatysRegister(gpib.Constants):
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231 _command = "AS?"
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232 _constants = [(0x01, "CKFL", "Check fault log"),
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233 (0x02, "FITR", "Filling time record"),
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234 (0x04, "FLTR", "Filters settings"),
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235 (0x08, "CFTP", "Curve fir in progress"),
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236 (0x10, "MSSM", "Missed sample"),
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237 (0x20, "TMPR", "Timed preview"),
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238 (0x40, "ACDA", "Accept date"),
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239 #...
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240 ]
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241
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242

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