Editing Instrument control package
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Latest revision | Your text | ||
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{| class="wikitable" style="text-align:center" | {| class="wikitable" style="text-align:center" | ||
|- | |- | ||
! !! Linux !! | ! !! Linux !! Windows (Cygwin) !! Windows (native) !! FreeBSD !! Mac OS X | ||
|- | |- | ||
! Serial | ! Serial | ||
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! i2c | ! i2c | ||
| bgcolor="green" | v0.1.0 || - || - || bgcolor="skyblue" | stalled || - | | bgcolor="green" | v0.1.0 || - || - || bgcolor="skyblue" | stalled || - | ||
|- | |- | ||
! TCP | ! TCP | ||
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{{Code|Check for interface support|<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code|Check for interface support|<syntaxhighlight lang="octave" style="font-size:13px"> | ||
pkg load instrument-control | pkg load instrument-control | ||
if | if (exist("serial") == 3) | ||
disp("Serial: Supported") | disp("Serial: Supported") | ||
else | else | ||
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#similarly with: | #similarly with: | ||
# | #exist("parallel") == 3 | ||
# | #exist("i2c") == 3 | ||
</syntaxhighlight>}} | </syntaxhighlight>}} | ||
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To be able to use GPIB on windows, the linux-gpib library needs to be 'faked'. This can be done by copying the following script and run it in a bash-terminal. | To be able to use GPIB on windows, the linux-gpib library needs to be 'faked'. This can be done by copying the following script and run it in a bash-terminal. | ||
< | <source lang="bash"> | ||
#!/bin/bash | #!/bin/bash | ||
# fake_linux_gpib.sh, Kire Pûdsje, Dec 2017 | # fake_linux_gpib.sh, Kire Pûdsje, Dec 2017 | ||
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#cleanup | #cleanup | ||
rm -f ${NI_DEF_FILE} | rm -f ${NI_DEF_FILE} | ||
</ | </source> | ||
== MacOS == | == MacOS == | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
In the example case the temperature sensor is connected to the i2c-ch341-usb device, | In the example case the temperature sensor is connected to the i2c-ch341-usb device, as as sufficient permissions to access the device as a user. | ||
Accoridng to the datasheet, the temperature device uses address 0x40, so create a i2c device using the linux device and address: | |||
<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | ||
i2cdev = i2c("/dev/i2c-1", 0x40) | i2cdev = i2c("/dev/i2c-1", 0x40) | ||
}} | |||
To read the | To read the termaturem register 0xF3 must be addressed and read (2 bytes of data): | ||
<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | ||
TEMP_MEASURE_NOHOLD = hex2dec("F3"); | TEMP_MEASURE_NOHOLD = hex2dec("F3"); | ||
fwrite (i2cdev, uint8([TEMP_MEASURE_NOHOLD])); | fwrite (i2cdev, uint8([TEMP_MEASURE_NOHOLD])); | ||
pause (0.02); | pause (0.02); | ||
data = fread (i2cdev, 3); | data = fread (i2cdev, 3); | ||
}} | |||
The data | The data needs to be converted to a 16 bit value and the unused part masked out. | ||
<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | ||
value = uint16(data(1))*256 + uint16(data(2)); | value = uint16(data(1))*256 + uint16(data(2)); | ||
value = bitand (value, hex2dec("FFFC")); | value = bitand (value, hex2dec("FFFC")); | ||
temp_Code = double(value); | temp_Code = double(value); | ||
}} | |||
Now convert the temperature to degrees C and display: | Now convert the temperature to degrees C and display: | ||
<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | ||
C = (175.72*temp_Code/65536)-46.85; | C = (175.72*temp_Code/65536)-46.85; | ||
printf ("temperature read %f C\n", C); | printf ("temperature read %f C\n", C); | ||
}} | |||
== TCP == | == TCP == | ||
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# Convert uint8 array to string, | # Convert uint8 array to string, | ||
char(data) | char(data) | ||
# close | # close usbtmc session | ||
vxi11_close(t0) | vxi11_close(t0) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
}} | }} | ||
=== Limitations === | === Limitations === | ||
For now, | For now, | ||
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* Every read or write command opens and closes a new gpib session, since the linux-gpib session pointer is only valid for single command. | * Every read or write command opens and closes a new gpib session, since the linux-gpib session pointer is only valid for single command. | ||
[[Category:Octave Forge]] | |||
[[Category:Octave Forge |