Raspberry Pi Forums

davenull

so you probably missed to count the "2" additionally, as it's a prime number, even if even

number of primes 0-100000 is 9592

davenull

wieso "Getrolle" ? meine Frage war doch, welche preiswerten nach eigener Erfahrung funktionieren. Antwort: alle funktionieren. Dann probiert und gewagt: - Eins funktioniert überhaupt nicht (Hama), - und beim anderen fehlt die <>| Taste, was definitiv nichts mit einem "alten Layout" zu tun hat, denn ...

davenull

but on Windows, to show up 1 internet site by Firefox , this lasts just a couple of seconds (depending on internet traffic), while by identical WiFi stick, at the same time, simultaneously or shortly one after the other, in the same home network, by Iceweasel on the Raspi it lasts about 1 minute !!!...

davenull

ps, I'm using 50µs (!) loops or (!) wiringPi pinchange events for my attempts on Raspi, but the code basically works already by 250µs (!) loops on Arduino! OTOH, on Arduino Due, implementing a Timer IRQ is just these 3 lines in setup() / main(), that's it : #include <DueTimer.h> Timer1.attachInterru...

davenull

I have no idea how I had to implement a change callback method, I don't understand it, I'm just using libs so far, ready to use.

At least I understand the simple methods of wiringPi.

davenull

ps, this is how I started until I finally failed after finishing this muddled-up different pin numbering thing): // encoder test // pigpio, pinchange IRQs #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <math.h> #include <fcntl.h> #include <string.h> #include <sys/ioctl.h> #inclu...

davenull

thanks for your input! You are right, I'm using the code on my Arduinos by timer interrupts already by myself, nevertheless many Arduino users trigger it as well by pinchange interrupts. But I agree, IMO a timer interrupt would be better to be used for it. But how to change my existing code to make ...

davenull

haha, nächstes Problem:
auf der Tastatur sind die 3 Zeichen
<
>
|
nicht vorhanden!
Ist das zu fassen? Stattdessen ist da eine mit [Fn] bezeichnete Funktions-Taste (neben dem [Y] ), ohne dass die 3 betr. Zeichen irgendwo anders dann auftauchen....

ooohh neeee!

davenull

if you could help me to implement this snippet into a quicker pigpio wrap using interrupts, that would be really a big favour! this is the wiringPi pseudo-pinchange-interrupt-handler: wiringPiISR( pinenc0A, INT_EDGE_BOTH, updateEncoders); wiringPiISR( pinenc0B, INT_EDGE_BOTH, updateEncoders); wiring...

davenull

is Go accessable by gcc C/C++ and the Geany IDE ? (as I actually understood, it wouldn't be...) Finally all my programs are coded in C and edited and compiled and built via Geany! (the display task of course is just an infinitesimal tiny part of the whole project, just in order to display all the ca...

davenull

the encoder maths itself is an approved algorithm to handle all the possible high/low or low/high Qab transitions which indeed works extremely quick and reliably on either platform, even on Arduino Unos. volatile long motenc[2]; volatile int8_t ISRab[2]; // 1/2 resolution int8_t enctab[16] = {0, 0,0...

davenull

ok, I give up. for the Raspi B+ for 2 encoder motors simultaneously I must state: - simple GPIO readings by pigpio in dedicated threads at repetitive 20-50µs loops is the same as for wiringPi : ok for very slow rotations (1 rev in 3 sec) , but faulty at ~10x regular speed = 4 rev./sec. http://www.mi...

davenull

a few questions... pigpio is installed, test ok. so for the encoder lib, 1st, again: how to download and how to install the lib "rotary_encoder.h" for system-wide use in either working directory? 2nd, for my setup using 2 encoder motors simultaneously: the pins are: // motor 0 #define pinenc0A 4 #de...

davenull

@ gkreidl:
jawoll, mit den Maus-Einstellungen in cmdline.txt klappt es jetzt!
Danke für den Tipp!

davenull

thank you! encoder functions never are running alone on the Pi, there are lots of parallel tasks I have to run simultaneously. Later, at the final end, even plus 1 quick UART send/receive task ( 64 bytes at 115200 continuously, interfacing a Arduino IO Multiplexer Expansion shield) The same it's for...

davenull

32 GB I got for EUR 9,90
8 GB I got for 4 EUR

both class 10

is that expensive or peanuts? I don't know.

davenull

sorry, FTM it's too complicated.
additionally it's not just about polling pins, but processing the calculations in real-time additionally.

I think I'll stick to Gordon Henderson's wiringPi.

Otherwise don't hezitate to port it and show me how to do it, please.

davenull

thank you, I did what I could (and what I could understand), I followed Gordon's advices, but pigpio is too weird and I don't know what to do with it. If one could port my code to pigpio instead of wiringPi, I gladly took the chance, but tbh, currently that is beyond my skills. FTM, the Raspi's enco...

davenull

I admit, my English is poor.

But you can convince me if you show me how to count all 360 degrees for fast rotations >= 4 revolutions/sec, feat. multitasking additionally for parallel running tasks.

Otherwise, the performance of the Raspi is too poor FTM.

davenull

well, for the application it actually IS too slow, because for slow rotation speed it counts all 360 for 1 revolution, and for quick rotation speed it looses 60 of 360 and counts just 300 of 360. Finally the application performance is what counts. Of course I see, that the reason is that we don't ha...

davenull

first attempt failed, 2nd attempt by pin change interrupt, 1/2 resolution, wiringPiISR() using INT_EDGE_BOTH. for very slow rotation the counting is working, now at 1 revolution == 360 counts == 360° as it should, (1 revolution in 3 sec) but again too slow for regular rotation speed , then lot of co...

davenull

yes, to do that and not get reading errors at higher speed is the point...
(the pigpio code viewtopic.php?p=662694#p662694 I don't understand, admittedly)

davenull

Python? I never use Python and don't understand a single word of that. But as I wrote above, the issue is just about getting the double resolution when using Gordon's code. Servos are no option, I need strong motors by high torque, and I already have them all. tbh, I would prefer to have the encoder...

davenull

ok, thank you, if all other approaches fail, I'll keep that in my mind. as I wrote (edited): tbh, I would prefer to have the encoder reading in simple threads in my own program, like Gordon did. in case of need In case of need, I'd take the 1/4 resolution (180 counts/rev.) by Gordon's code if there ...

davenull

is this running and compatible to wiringPi and pthread and openVG and my UART messaging tasks? Note that different sensor readings have to be processed additionally, all compiled and built by Geany IDE. tbh, I would prefer to have the encoder reading in simple threads in my own program, like Gordon ...

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