can I use rpi as a logic analyzer???

[hamza]

hi

can I use rpi as a logic analyzer???

[buja]

Check this: http://abyz.co.uk/rpi/pigpio/piscope.html

[B.Goode]

https://www.vellemanstore.com/en/oscill ... spberry-pi

[hamza]

Thank u buja
I followed all steps..step by step...but nothing is working...
When I type sudo pigpio
The error is comnand not found...
What is the problem??
Becouse I installed it or rpi 2b

[hamza]

Thank u goode..but I think the rpi is enough to read signal without additional componants.

[mahjongg]

as long as the signals are digital, and stay below 3.3V (or you will blow up the PI which is NOT 5V tolerant).

also, there are very cheap 8-channel USB logic analyzers these day that sell for just $8 or so from Chinese sites, including windows software, they work, I have used them. They are clones of the Salea logic analyzer, but for a tenth of the price, Here is one of them: http://www.dx.com/nl/p/logic-analyzer-w ... i_GRVf4beA

[joan]

Thank u buja
I followed all steps..step by step...but nothing is working...
When I type sudo pigpio
The error is comnand not found...
What is the problem??
Becouse I installed it or rpi 2b

sudo pigpiod

[hamza]

thank u

I followed all steps,but still not working....plz advice

pi@raspberrypi ~/PIGPIO $ gcc -o foobar foobar.c -lpigpio -lrt -lpthread
gcc: error: foobar.c: No such file or directory
pi@raspberrypi ~/PIGPIO $ sudo ./foobar
sudo: ./foobar: command not found
pi@raspberrypi ~/PIGPIO $ sudo pigpiod
2015-10-28 20:07:01 initInitialise: Can't lock /var/run/pigpio.pid
Can't initialise pigpio library
pi@raspberrypi ~/PIGPIO $ cd
pi@raspberrypi ~ $ sudo pigpiod
2015-10-28 20:07:48 initInitialise: Can't lock /var/run/pigpio.pid
Can't initialise pigpio library
pi@raspberrypi ~ $

[hamza]

as long as the signals are digital, and stay below 3.3V (or you will blow up the PI which is NOT 5V tolerant).

also, there are very cheap 8-channel USB logic analyzers these day that sell for just $8 or so from Chinese sites, including windows software, they work, I have used them. They are clones of the Salea logic analyzer, but for a tenth of the price, Here is one of them: http://www.dx.com/nl/p/logic-analyzer-w ... i_GRVf4beA

thank you but I quick solution becouse I have no time for sample delevery issue.

[joan]

thank u

I followed all steps,but still not working....plz advice

pi@raspberrypi ~/PIGPIO $ gcc -o foobar foobar.c -lpigpio -lrt -lpthread
gcc: error: foobar.c: No such file or directory
pi@raspberrypi ~/PIGPIO $ sudo ./foobar
sudo: ./foobar: command not found
pi@raspberrypi ~/PIGPIO $ sudo pigpiod
2015-10-28 20:07:01 initInitialise: Can't lock /var/run/pigpio.pid
Can't initialise pigpio library
pi@raspberrypi ~/PIGPIO $ cd
pi@raspberrypi ~ $ sudo pigpiod
2015-10-28 20:07:48 initInitialise: Can't lock /var/run/pigpio.pid
Can't initialise pigpio library
pi@raspberrypi ~ $

Try

sudo killall piscope
sudo killall pigpiod
sudo rm /var/run/pigpio.pid

Any of all of the above may return errors. Ignore them.

Then

sudo pigpiod
piscope&

[hamza]

thank you...its working now but the screen is pink...i think there is something wrong!!!@!!!!!

[joan]

I have no idea. Send some events to see if the screen updates.

E.g. from the command line enter the following command

pigs pwm 4 128 mils 1000 pwm 4 0

[hamza]

sorry there is no update or any change..just pink or blue screen.

[joan]

sorry there is no update or any change..just pink or blue screen.

I don't know why you have funny colours.

You still don't seem to be starting things properly.

Try

sudo killall piscope
sudo killall pigpiod
sudo rm /var/run/pigpio.pid

Any of all of the above may return errors. Ignore them.

Then

sudo pigpiod
piscope&

(NOT sudo pigpiod & piscope).

[hamza]

sorry there is no update or any change..just pink or blue screen.

I don't know why you have funny colours.

You still don't seem to be starting things properly.

Try

sudo killall piscope
sudo killall pigpiod
sudo rm /var/run/pigpio.pid

Any of all of the above may return errors. Ignore them.

Then

sudo pigpiod
piscope&

(NOT sudo pigpiod & piscope).

Thank you but still same problem.....

[joan]

I don't normally run piscope on the Pi.

I just did

wget abyz.co.uk/rpi/pigpio/piscope.tar
tar xvf piscope.tar
cd PISCOPE
make hf
make install

on a Pi2.

It works fine on the Pi2.

piscope.gif (58.76 KiB) Viewed 5546 times

[hamza]

Thank u joan...its working correctly now

I hope the time mesuearment is accurate.

[joan]

Thank u joan...its working correctly now

I hope the time mesuearment is accurate.

The default sampling rate at 5µs intervals should get relative timings accurate to +/- 10µs. That is good enough for almost everything I do on the Pi.

For anything else I'd used a Saleae 8-channel logic analyser dongle clone. They sample at up to 24 MHz.

[hamza]

Thank u joan...its working correctly now

I hope the time mesuearment is accurate.

The default sampling rate at 5µs intervals should get relative timings accurate to +/- 10µs. That is good enough for almost everything I do on the Pi.

For anything else I'd used a Saleae 8-channel logic analyser dongle clone. They sample at up to 24 MHz.

Thank u ..you are great man.