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Problems compiling native extensions on Raspbian. Detail currently unknown. Should roll a Raspbian SD and attempt to fix.

Requires Ruby-dev, also? Or fails with /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf

How do i use parity with the raspberry?

Hi, I noticed the method #serialFlush is missing from the ruby library, it seems to me that the wrapper for the underlying C method is as well (but C and C lib wrapping is something completely obscure to me as far as now).
Is there any ruby way to flush the data coming from the serial?

Thanks for help
Andrea

Hi,

Got a small issue when installing WiringPi-Ruby, all compilation and gem installation went well (except the include path to the WiringPi headers were wrong (?)).
But when I tried running it I got 'Undefined symbol' for wiringPiSetup, after checking with nm,
none of the WiringPi functions were "linked" inside the .so.
But all this seems "normal" as neither the Makefile nor any other files have anything related to libwiringpi.a;
which makes me think that I've done something wrong...

I ended up modifying the Makefile created by ruby :/ to explicitly link to libwiringpi..
Looks like everything works now, but I still feel like something is wrong :/

Thanks for your work !

There's an update to the wiringpi library that auto-detects the revision of raspberry pi and adapts the pin number mappings to take into account the changed pinout of the header. Any plan to upgrade? I just looked at what it might take to do a pullup request, but I'm not familiar enough with swig and the ruby to c interface to do it with confidence...

Hello

I hope this is the right place to ask:
Gordons wiring_pi implementation does support the use of a hd44780 display ( https://projects.drogon.net/raspberry-pi/wiringpi/lcd-library/ )
Is it poossible to use it with this gem too? I have written a little ruby daemon, and it would be awesome to access the display directly without calling an external phyton script or something like that.

Greetings
Dakky

I have implemented a small pure-ruby-library(150 lines) for spi-access.

usage:

require "wiringpi/spi"
spi = WiringPi::Spi.new("/dev/spidev0.0",speed: 1000000)
result = spi.dataRW([1,2,3,0,4],delay: 100,bytedelay: 10)
spi.close

The lib requires the package ruby-1.9x and ruby-ffi, both is available in rapbian wheezy

Do you think its worth to integrate it into this project?

con:

• no c-wrapper -> maybe less performant
• the interface is more OO and is different to wiringPi -> is this a pro?
  -...

pro:

• pure ruby, easy to extend (even in live system)
• no dependency to wiringPi
• the current features of the c-winrinPi-spi was not enough for my use case
  -...

By the way, the same arguments also count for any other functionality of wiringPi ;-))

Am i doing somehting wrong? or is this just a bug?

irb(main):007:0> require 'wiringpi2'
=> false
irb(main):008:0> s = WiringPi::SPI.new(0,500000)
NameError: uninitialized constant WiringPi::SPI::Wiringpi
        from /var/lib/gems/1.9.1/gems/wiringpi2-2.0.1/lib/wiringpi/spi.rb:6:in `initialize'
        from (irb):8:in `new'
        from (irb):8
        from /usr/bin/irb:12:in `<main>'
irb(main):009:0>

LoadError: /root/.gem/ruby/2.0.0/gems/wiringpi-1.1.0/lib/wiringpi/wiringpi.so: undefined symbol: digitalRead - /root/.gem/ruby/2.0.0/gems/wiringpi-1.1.0/lib/wiringpi/wiringpi.so
from /usr/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:36:in require' from /usr/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:36:inrequire'
from /root/.gem/ruby/2.0.0/gems/wiringpi-1.1.0/lib/wiringpi.rb:1:in <top (required)>' from /usr/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:60:inrequire'
from /usr/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:60:in rescue in require' from /usr/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb:35:inrequire'
from (irb):1
from /usr/bin/irb:12:in `

When running the following Ruby file as root:

#!/usr/bin/env ruby

require 'wiringpi'
io = WiringPi::GPIO.new(WPI_MODE_GPIO)
pin = 18
range = (15..255).to_a
range += range.reverse

def sleep_func(i)
  sleep(0.004) if (i > 150)
  sleep(0.005) if (i > 125) &&  (i < 151)
  sleep(0.007) if (i > 100) &&  (i < 126)
  sleep(0.010) if (i > 75)  &&  (i < 101)
  sleep(0.014) if (i > 50)  &&  (i < 76)
  sleep(0.018) if (i > 25)  &&  (i < 51)
  sleep(0.019) if (i > 1)   &&  (i < 26)
end

loop do 
  range.each do |i|
    io.pwmWrite pin, ((i/255.0) * 1000).to_i
    sleep_func i
  end

  sleep 1
end

I get this error:

/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in 'require': cannot load such file -- wiringpi
(LoadError)
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in 'require' 
from ./pulse.rb:3:in '{main}' 

The squiggly brackets are <>. The markdown didn't like them, hehe.

I read Gadgetoid's issue and dutifully installed ruby-dev, but the same error still occurs.
Not sure if it's bad coding, bad installing or something else. I'm a bit of a 'Ruby Newby', so please forgive me if I'm being stupid :)