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annotate usb488.py @ 60:4558e5ccd775

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Honour timeout passed into ask()
author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 08 Jan 2021 14:04:18 +1030
parents dd27521002a5
children 29bcef559283
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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 # http://sdpha2.ucsd.edu/Lab_Equip_Manuals/usbtmc_usb488_subclass_1_00.pdf
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36 #
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37
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38 import usb
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39 from functools import reduce
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41 #
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42 # The usual SCPI commands are wrapped before being sent.
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43 #
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44 # Write:
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45 # Offset Field Size Value Description
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46 # 0 MsgID 1 0x01 DEV_DEP_MSG_OUT
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47 # 1 bTag 1 0x01 Varies with each transfer
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48 # 2 bTagInverse 1 0xfe Inverse of previous field
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49 # 3 Reserved 1 0x00
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50 # 4 TransferSize 4 0x06
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51 # 5 .. 0x00
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52 # 6 .. 0x00
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53 # 7 .. 0x00
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54 # 8 bmTransferAttr 1 0x01 1 == end of msg
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55 # 9 Reserved 1 0x00
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56 # 10 Reserved 1 0x00
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57 # 11 Reserved 1 0x00
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58 # 12 Msg itself 1 0x2a '*'
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59 # 13 1 0x49 'I'
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60 # 14 1 0x44 'D'
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61 # 15 1 0x4e 'N'
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62 # 16 1 0x3f '?'
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63 # 17 1 0x0a '\n'
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64 # 18-19 Alignment 2 0x0000 Bring into 4 byte alignment
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65 #
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66 #
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67 # Send a read request:
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68 # Offset Field Size Value Description
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69 # 0 MsgID 1 0x02 REQUEST_DEV_DEP_MSG_IN
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70 # 1 bTag 1 0x02 Varies with each transfer
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71 # 2 bTagInverse 1 0xfd Inverse of previous field
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72 # 3 Reserved 1 0x00
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73 # 4 TransferSize 4 0x64
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74 # 5 .. 0x00
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75 # 6 .. 0x00
0
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76 # 7 .. 0x00
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77 # 8 bmTransferAttr 1 0x00
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78 # 9 Term char 1 0x00
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79 # 10 Reserved 1 0x00
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80 # 11 Reserved 1 0x00
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81
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82 # No libusb versions of these available
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83 USB_CLASS_APP_SPECIFIC = 254
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84 USB_SUBCLASS_TMC = 3
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85 USB_PROTOCOL_488 = 1
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86
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87 # USB488 message IDs
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88 DEV_DEP_MSG_OUT = 1
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89 REQUEST_DEV_DEP_MSG_IN = 2
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90 DEV_DEP_MSG_IN = 2
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91
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92 class USB488Device(object):
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93 def __init__(self, vendor = None, product = None, serial = None, path = None):
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94 """Search for a USB488 class device, if specified vendor,
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95 product, serial and path will refine the search"""
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96
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97 busses = usb.busses()
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98
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99 #
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100 # Search for the device we want
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101 #
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102 found = False
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103 for bus in busses:
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104 for dev in bus.devices:
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105 # Skip ones that don't match
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106 if vendor != None and dev.idVendor != vendor:
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107 continue
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108 if product != None and dev.idProduct != product:
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109 continue
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110 if serial != None and dev.idSerialNumber != serial:
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111 continue
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112 if path != None and dev.filename != path:
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113 continue
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114
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115 # The libusb examples say you can check for device
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116 # class and then open, however in that case you can't
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117 # find the endpoint number which seems pretty useless
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118 # unless you want to hard code everything.
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119 for confidx in range(len(dev.configurations)):
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120 for iface in dev.configurations[confidx].interfaces:
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121 for altif in iface:
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122 # Check if this is a USB488 capable interface
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123 if altif.interfaceClass == USB_CLASS_APP_SPECIFIC and \
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124 altif.interfaceSubClass == USB_SUBCLASS_TMC and \
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125 altif.interfaceProtocol == USB_PROTOCOL_488:
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126 found = True
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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 found:
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135 break
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136 if not found:
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137 raise BaseException("Could not find a suitable USB device")
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138
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139 # Open the device and claim the USB interface that supports the spec
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140 handle = dev.open()
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141 handle.setConfiguration(dev.configurations[confidx].value)
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142 handle.claimInterface(altif.interfaceNumber)
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143 handle.setAltInterface(altif.alternateSetting)
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144 self.dev = dev
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145 self.handle = handle
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146
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147 # Get some info for humans
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148 try:
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149 self.vendname = handle.getString(dev.iManufacturer, 1024)
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150 except ValueError:
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151 self.vendname = None
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152 try:
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153 self.prodname = handle.getString(dev.iProduct, 1024)
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154 except ValueError:
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155 self.prodname = None
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156 try:
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157 self.serial = handle.getString(dev.iSerialNumber, 1024)
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158 except ValueError:
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159 self.serial = None
0
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160
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161 # Determine the endpoints for each operation type
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162 self.intrep = self.bulkinep = self.bulkoutep = None
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163
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164 for ep in altif.endpoints:
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165 if ep.type == usb.ENDPOINT_TYPE_INTERRUPT and \
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166 ep.address & usb.ENDPOINT_IN == usb.ENDPOINT_IN:
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167 self.intrep = ep.address
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ad5942d22f78 Use BaseException rather than strings.
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168
0
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169 if ep.type == usb.ENDPOINT_TYPE_BULK:
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170 if ep.address & usb.ENDPOINT_IN == usb.ENDPOINT_IN:
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171 self.bulkinep = ep.address
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172 else:
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173 self.bulkoutep = ep.address
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174 self.maxPacket = ep.maxPacketSize
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175
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176 # Required for 488.2 devices, optional otherwise
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177 if self.intrep == None:
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178 print("Can't find interrupt endpoint")
0
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179
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180 # Data from the scope (mandatory)
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181 if self.bulkinep == None:
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182 raise BaseException("Can't find bulk-in endpoint")
0
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183
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184 # Data to the scope (mandatory)
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185 if self.bulkoutep == None:
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186 raise BaseException("Can't find bulk-out endpoint")
0
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187
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188 self.tag = 1
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189
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190 def __str__(self):
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191 rtn = "Mfg: %s Prod: %s" % (self.vendname, self.prodname)
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192 if self.serial != "":
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193 rtn += " S/N: " + self.serial
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194
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195 return rtn
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196
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197 def incrtag(self):
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198 self.tag = (self.tag + 1) % 255
0
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199 if self.tag == 0:
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200 self.tag += 1
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201
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202 def write(self, data):
12
5ff9130cc953 This code isn't scope specific.
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203 """Send data (string) to the instrument"""
1
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parents: 0
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204
56
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205 orddata = list(map(ord, data))
1
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206 # The device needs a \n at the end, enfore this
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207 if orddata[-1] != '\n':
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208 orddata += [ord('\n')]
0
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209 datalen = len(orddata)
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210
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211 # Build the packet
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212 pkt = [ DEV_DEP_MSG_OUT, self.tag, ~self.tag & 0xff, 0x00,
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213 datalen & 0xff, datalen >> 8 & 0xff, datalen >> 16 & 0xff,
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214 datalen >> 24 & 0xff, 1, 0, 0, 0 ]
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215
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216 # Add the data
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217 pkt = pkt + orddata
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218
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219 # Align to 4 bytes
58
0684a20cc5c3 Fix for Python 3
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diff changeset
220 alignlen = ((len(pkt) // 4) + 1) * 4
0
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221 pkt = pkt + [0] * (alignlen - len(pkt))
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222
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223 # Bump the tag
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224 self.incrtag()
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225
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226 # Split it up into maxPacket sized chunks and send..
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227 while len(pkt) > 0:
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228 chunk = pkt[0:self.maxPacket]
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229 pkt = pkt[self.maxPacket:]
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230
1
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parents: 0
diff changeset
231 #print "Sending %s bytes of data: %s" % (len(chunk), chunk)
0
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232 wrote = self.handle.bulkWrite(self.bulkoutep, chunk)
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233 if wrote != len(chunk):
55
ad5942d22f78 Use BaseException rather than strings.
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parents: 23
diff changeset
234 raise BaseException("Short write, got %d, expected %d" % (wrote, len(chunk)))
0
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235
23
876d951bbcc0 Redo timeout in a more sensible way (also change it to 100ms)
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diff changeset
236 def read(self, timeout = None):
5
51d1fc44a753 Add variable timeout for reads.
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parents: 4
diff changeset
237 """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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parents: 4
diff changeset
238
23
876d951bbcc0 Redo timeout in a more sensible way (also change it to 100ms)
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parents: 12
diff changeset
239 if timeout == None:
59
dd27521002a5 Change default timeout to 500msec
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diff changeset
240 timeout = 0.5
dd27521002a5 Change default timeout to 500msec
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 58
diff changeset
241
5
51d1fc44a753 Add variable timeout for reads.
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parents: 4
diff changeset
242 # Mangle into milliseconds
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parents: 4
diff changeset
243 _timeout = int(timeout * 1000.0)
0
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244
1
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
245 # Maximum we accept at once
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parents: 0
diff changeset
246 # Was 2^31 - 1 but that seems to make things take too long to
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
247 # read (perhaps libusb tries to malloc it..)
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
248 datalen = 10240
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
249 data = []
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
250
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
251 while True:
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
252 # Ask the device to send us something
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parents: 0
diff changeset
253 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
254 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
255 datalen >> 24 & 0xff, 0, 0, 0, 0]
0
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parents:
diff changeset
256
1
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
257 # Expected tag
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
258 exptag = self.tag
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
259
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
260 # Bump tag
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
261 self.incrtag()
0
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parents:
diff changeset
262
1
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
263 # Send it
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
264 #print "Sending " + str(pkt)
5
51d1fc44a753 Add variable timeout for reads.
Daniel O'Connor <darius@dons.net.au>
parents: 4
diff changeset
265 wrote = self.handle.bulkWrite(self.bulkoutep, pkt, _timeout)
1
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
266 if wrote != len(pkt):
56
91b476ebc0f2 Run through 2to3
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parents: 55
diff changeset
267 print("Short write, got %d, expected %d" % (wrote, len(pkt)))
0
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268
1
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parents: 0
diff changeset
269 #print "Reading.."
5
51d1fc44a753 Add variable timeout for reads.
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parents: 4
diff changeset
270 read = self.handle.bulkRead(self.bulkinep, datalen, _timeout)
1
e2089824735a Make the read support work properly & check what the device gives us.
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parents: 0
diff changeset
271 #print "Read %s bytes: %s" % (len(read), str(read))
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parents: 0
diff changeset
272
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
273 if read[0] != DEV_DEP_MSG_IN:
55
ad5942d22f78 Use BaseException rather than strings.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 23
diff changeset
274 raise BaseException("Unexpected Msg ID, got %s expected %d" % (read[0], DEV_DEP_MSG_IN))
1
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
275 if read[1] != exptag:
55
ad5942d22f78 Use BaseException rather than strings.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 23
diff changeset
276 raise BaseException("Unexpected tag, got %d expected %d" % (read[1], exptag))
1
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
277 if read[2] != ~exptag & 0xff:
55
ad5942d22f78 Use BaseException rather than strings.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 23
diff changeset
278 raise BaseException("Unexpected tag inverse, got %d expected %d" % (read[1], ~exptag & 0xff))
0
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diff changeset
279
1
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
280 actualdata = read[4] | read[5] << 8 | read[6] << 16 | read[7] << 24
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
281 #print "Computed datalen is %d" % (actualdata)
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
282 data += read[12:12 + actualdata]
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
283 if read[8] & 0x01:
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
284 #print "Breaking out due to EOM"
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Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
285 break
e2089824735a Make the read support work properly & check what the device gives us.
Daniel O'Connor <darius@dons.net.au>
parents: 0
diff changeset
286
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287 # Stringify result for easier consumption
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288 result = reduce(lambda x, y: x+y, list(map(chr, data)))
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289 # Trim off \n if present
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290 if result[-1] == '\n':
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291 result = result[0:-1]
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292
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293 return result
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294
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295 def ask(self, s, timeout = None):
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296 self.write(s)
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297 return self.read(timeout = timeout)
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298
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299 def isConnected(self):
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300 """Check if the device is present"""
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301
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302 # libusb makes it very hard (at least on FreeBSD) to determine if we're still connected.
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303 # This is a reasonable proxy..
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304 try:
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305 self.handle.getString(self.dev.iManufacturer, 100)
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306 except USBError as e:
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307 return False
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308
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309 return True
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310