Raspberry Pi Forums

hi

can I use rpi as a logic analyzer???

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

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

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

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

hamza wrote: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

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 ~ $

mahjongg wrote: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.

hamza wrote: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&

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

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

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

hamza wrote: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).

joan wrote:

hamza wrote: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.....

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.

Thank u joan...its working correctly now

I hope the time mesuearment is accurate.

hamza wrote: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.

joan wrote:

hamza wrote: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.