annotate usb488.py @ 41:df1b4d7e988f

Reword text to be clearer.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 28 Sep 2011 13:35:45 +0930
parents 876d951bbcc0
children ad5942d22f78
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1 #!/usr/bin/env python
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2
7
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3 # Copyright (c) 2009
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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27
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28 #
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29 # Spec/info..
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30 #
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31 # http://www.usb.org/developers/devclass_docs/USBTMC_1_006a.zip
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32 # http://svn.openmoko.org/developers/werner/ahrt/host/tmc/README
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33 # http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL&ckey=1189335&lc=eng&cc=US&nfr=-35560.0.00
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34 # linux-2.6.29.3/drivers/usb/class/usbtmc.c
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35 #
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36
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37 import usb
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38
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39 #
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40 # The usual SCPI commands are wrapped before being sent.
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41 #
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42 # Write:
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43 # Offset Field Size Value Description
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44 # 0 MsgID 1 0x01 DEV_DEP_MSG_OUT
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45 # 1 bTag 1 0x01 Varies with each transfer
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46 # 2 bTagInverse 1 0xfe Inverse of previous field
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47 # 3 Reserved 1 0x00
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48 # 4 TransferSize 4 0x06
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49 # 5 .. 0x00
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50 # 6 .. 0x00
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51 # 7 .. 0x00
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52 # 8 bmTransferAttr 1 0x01 1 == end of msg
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53 # 9 Reserved 1 0x00
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54 # 10 Reserved 1 0x00
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55 # 11 Reserved 1 0x00
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56 # 12 Msg itself 1 0x2a '*'
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57 # 13 1 0x49 'I'
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58 # 14 1 0x44 'D'
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59 # 15 1 0x4e 'N'
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60 # 16 1 0x3f '?'
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61 # 17 1 0x0a '\n'
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62 # 18-19 Alignment 2 0x0000 Bring into 4 byte alignment
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63 #
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64 #
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65 # Send a read request:
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66 # Offset Field Size Value Description
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67 # 0 MsgID 1 0x02 REQUEST_DEV_DEP_MSG_IN
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68 # 1 bTag 1 0x02 Varies with each transfer
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69 # 2 bTagInverse 1 0xfd Inverse of previous field
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70 # 3 Reserved 1 0x00
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71 # 4 TransferSize 4 0x64
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72 # 5 .. 0x00
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73 # 6 .. 0x00
0
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74 # 7 .. 0x00
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75 # 8 bmTransferAttr 1 0x00
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76 # 9 Term char 1 0x00
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77 # 10 Reserved 1 0x00
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78 # 11 Reserved 1 0x00
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79
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80 # No libusb versions of these available
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81 USB_CLASS_APP_SPECIFIC = 254
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82 USB_SUBCLASS_TMC = 3
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83 USB_PROTOCOL_488 = 1
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84
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85 # USB488 message IDs
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86 DEV_DEP_MSG_OUT = 1
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87 REQUEST_DEV_DEP_MSG_IN = 2
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88 DEV_DEP_MSG_IN = 2
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89
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90 class USB488Device(object):
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91 def __init__(self, vendor = None, product = None, serial = None, path = None):
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92 """Search for a USB488 class device, if specified vendor,
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93 product, serial and path will refine the search"""
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94
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95 busses = usb.busses()
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96
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97 #
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98 # Search for the device we want
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99 #
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100 found = False
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101 for bus in busses:
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102 for dev in bus.devices:
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103 # Skip ones that don't match
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104 if vendor != None and dev.idVendor != vendor:
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105 continue
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106 if product != None and dev.idProduct != product:
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107 continue
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108 if serial != None and dev.idSerialNumber != serial:
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109 continue
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110 if path != None and dev.filename != path:
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111 continue
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112
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113 # The libusb examples say you can check for device
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114 # class and then open, however in that case you can't
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115 # find the endpoint number which seems pretty useless
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116 # unless you want to hard code everything.
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117 for confidx in xrange(len(dev.configurations)):
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118 for iface in dev.configurations[confidx].interfaces:
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119 for altif in iface:
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120 # Check if this is a USB488 capable interface
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121 if altif.interfaceClass == USB_CLASS_APP_SPECIFIC and \
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122 altif.interfaceSubClass == USB_SUBCLASS_TMC and \
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123 altif.interfaceProtocol == USB_PROTOCOL_488:
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124 found = True
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125 break
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126 if found:
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127 break
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128 if found:
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129 break
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130 if found:
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131 break
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132 if found:
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133 break
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134 if not found:
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135 raise "Could not find a suitable USB device"
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136
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137 # Open the device and claim the USB interface that supports the spec
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138 handle = dev.open()
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139 handle.setConfiguration(dev.configurations[confidx].value)
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140 handle.claimInterface(altif.interfaceNumber)
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141 handle.setAltInterface(altif.alternateSetting)
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142 self.dev = dev
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143 self.handle = handle
0
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144
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145 # Get some info for humans
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146 self.vendname = handle.getString(dev.iManufacturer, 1024)
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147 self.prodname = handle.getString(dev.iProduct, 1024)
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148 self.serial = handle.getString(dev.iSerialNumber, 1024)
0
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149
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150 # Determine the endpoints for each operation type
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151 self.intrep = self.bulkinep = self.bulkoutep = None
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152
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153 for ep in altif.endpoints:
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154 if ep.type == usb.ENDPOINT_TYPE_INTERRUPT and \
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155 ep.address & usb.ENDPOINT_IN == usb.ENDPOINT_IN:
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156 self.intrep = ep.address
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157
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158 if ep.type == usb.ENDPOINT_TYPE_BULK:
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159 if ep.address & usb.ENDPOINT_IN == usb.ENDPOINT_IN:
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160 self.bulkinep = ep.address
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161 else:
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162 self.bulkoutep = ep.address
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163 self.maxPacket = ep.maxPacketSize
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164
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165 # Required for 488.2 devices, optional otherwise
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166 if self.intrep == None:
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167 print "Can't find interrupt endpoint"
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168
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169 # Data from the scope (mandatory)
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170 if self.bulkinep == None:
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171 raise "Can't find bulk-in endpoint"
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172
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173 # Data to the scope (mandatory)
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174 if self.bulkoutep == None:
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175 raise "Can't find bulk-out endpoint"
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176
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177 self.tag = 1
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178
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179 def __str__(self):
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180 rtn = "Mfg: %s Prod: %s" % (self.vendname, self.prodname)
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181 if self.serial != "":
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182 rtn += " S/N: " + self.serial
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183
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184 return rtn
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185
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186 def incrtag(self):
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187 self.tag += 1
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188 if self.tag == 0:
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189 self.tag += 1
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190
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191 def write(self, data):
12
5ff9130cc953 This code isn't scope specific.
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192 """Send data (string) to the instrument"""
1
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193
0
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194 orddata = map(ord, data)
1
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195 # The device needs a \n at the end, enfore this
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196 if orddata[-1] != '\n':
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197 orddata += [ord('\n')]
0
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198 datalen = len(orddata)
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199
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200 # Build the packet
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201 pkt = [ DEV_DEP_MSG_OUT, self.tag, ~self.tag & 0xff, 0x00,
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202 datalen & 0xff, datalen >> 8 & 0xff, datalen >> 16 & 0xff,
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203 datalen >> 24 & 0xff, 1, 0, 0, 0 ]
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204
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205 # Add the data
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206 pkt = pkt + orddata
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207
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208 # Align to 4 bytes
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209 alignlen = ((len(pkt) / 4) + 1) * 4
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210 pkt = pkt + [0] * (alignlen - len(pkt))
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211
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212 # Bump the tag
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213 self.incrtag()
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214
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215 # Split it up into maxPacket sized chunks and send..
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216 while len(pkt) > 0:
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217 chunk = pkt[0:self.maxPacket]
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218 pkt = pkt[self.maxPacket:]
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219
1
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220 #print "Sending %s bytes of data: %s" % (len(chunk), chunk)
0
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221 wrote = self.handle.bulkWrite(self.bulkoutep, chunk)
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222 if wrote != len(chunk):
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223 raise "Short write, got %d, expected %d" % (wrote, len(chunk))
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224
23
876d951bbcc0 Redo timeout in a more sensible way (also change it to 100ms)
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225 def read(self, timeout = None):
5
51d1fc44a753 Add variable timeout for reads.
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226 """Read data from the device, waits for up to timeout seconds for each USB transaction"""
51d1fc44a753 Add variable timeout for reads.
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diff changeset
227
23
876d951bbcc0 Redo timeout in a more sensible way (also change it to 100ms)
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228 if timeout == None:
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229 timeout = 0.1
876d951bbcc0 Redo timeout in a more sensible way (also change it to 100ms)
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230
5
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231 # Mangle into milliseconds
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232 _timeout = int(timeout * 1000.0)
0
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233
1
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234 # Maximum we accept at once
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235 # Was 2^31 - 1 but that seems to make things take too long to
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236 # read (perhaps libusb tries to malloc it..)
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237 datalen = 10240
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diff changeset
238 data = []
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239
e2089824735a Make the read support work properly & check what the device gives us.
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diff changeset
240 while True:
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parents: 0
diff changeset
241 # Ask the device to send us something
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diff changeset
242 pkt = [ REQUEST_DEV_DEP_MSG_IN, self.tag, ~self.tag & 0xff, 0x00,
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
243 datalen & 0xff, datalen >> 8 & 0xff, datalen >> 16 & 0xff,
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
244 datalen >> 24 & 0xff, 0, 0, 0, 0]
0
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245
1
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246 # Expected tag
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247 exptag = self.tag
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diff changeset
248
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249 # Bump tag
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diff changeset
250 self.incrtag()
0
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251
1
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252 # Send it
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253 #print "Sending " + str(pkt)
5
51d1fc44a753 Add variable timeout for reads.
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diff changeset
254 wrote = self.handle.bulkWrite(self.bulkoutep, pkt, _timeout)
1
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parents: 0
diff changeset
255 if wrote != len(pkt):
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
256 print "Short write, got %d, expected %d" % (wrote, len(pkt))
0
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257
1
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diff changeset
258 #print "Reading.."
5
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diff changeset
259 read = self.handle.bulkRead(self.bulkinep, datalen, _timeout)
1
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diff changeset
260 #print "Read %s bytes: %s" % (len(read), str(read))
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parents: 0
diff changeset
261
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parents: 0
diff changeset
262 if read[0] != DEV_DEP_MSG_IN:
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parents: 0
diff changeset
263 raise "Unexpected Msg ID, got %s expected %d" % (read[0], DEV_DEP_MSG_IN)
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
264 if read[1] != exptag:
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
265 raise "Unexpected tag, got %d expected %d" % (read[1], exptag)
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parents: 0
diff changeset
266 if read[2] != ~exptag & 0xff:
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
267 raise "Unexpected tag inverse, got %d expected %d" % (read[1], ~exptag & 0xff)
0
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268
1
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parents: 0
diff changeset
269 actualdata = read[4] | read[5] << 8 | read[6] << 16 | read[7] << 24
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diff changeset
270 #print "Computed datalen is %d" % (actualdata)
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parents: 0
diff changeset
271 data += read[12:12 + actualdata]
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
272 if read[8] & 0x01:
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parents: 0
diff changeset
273 #print "Breaking out due to EOM"
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parents: 0
diff changeset
274 break
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parents: 0
diff changeset
275
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parents: 0
diff changeset
276 # Stringify result for easier consumption
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parents: 0
diff changeset
277 result = reduce(lambda x, y: x+y, map(chr, data))
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
278 # Trim off \n if present
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parents: 0
diff changeset
279 if result[-1] == '\n':
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parents: 0
diff changeset
280 result = result[0:-1]
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parents: 0
diff changeset
281
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
282 return result
0
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diff changeset
283
11
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
diff changeset
284 def isConnected(self):
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diff changeset
285 """Check if the device is present"""
f588f5bc834a Add a method to determine if the device is still connected.
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diff changeset
286
f588f5bc834a Add a method to determine if the device is still connected.
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diff changeset
287 # libusb makes it very hard (at least on FreeBSD) to determine if we're still connected.
f588f5bc834a Add a method to determine if the device is still connected.
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diff changeset
288 # This is a reasonable proxy..
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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289 try:
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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290 self.handle.getString(self.dev.iManufacturer, 100)
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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291 except USBError, e:
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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292 return False
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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293
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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294 return True
f588f5bc834a Add a method to determine if the device is still connected.
Daniel O'Connor <darius@dons.net.au>
parents: 10
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295