Bindings to Velleman K8055 dll https://github.com/jputcu/bindings-K8055
|Latest on Hackage:||0.1.2|
This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.
This library allows you to control the Velleman K8055, a usb experiment interface board.
The board has:
- 5 digital inputs
- 2 analog inputs
- 8 digital outputs
- 2 analog outputs
How is works
Velleman provides a
K8055D.dll, so this is a Windows-only solution, to interact with the board.
A FFI interface has been written to interact with the dll functions.
For this I had to create a definition file
K8055D.def and run
dlltool -k -d K8055D.def -l K8055D.dll.a.
My first attempt at interfacing this board was using
bindings-libusb. After getting is to work
on Linux I was unable to compile it on Windows. Because my solution should work on Windows
I chose to interface the existing dll.
I haven't given up on the my first solution, it's still the cleanest way to go, having no K8055 specific, native library dependencies and being platform-independent.
As mentioned earlier, we need the
K8055D.dll. This can be obtained by downloading the official
Velleman K8055 SDK. Extract it and put the dll,
DLL_v188.8.131.52/K8055D.dll, somewhere in PATH,
Then all you need to do is install the cabal package:
cabal install Bindings-K8055
Press a button, digital in, an run the following code:
import Bindings.K8055 main :: IO () main = withDevice Card1 (readAllDigital >>= print)
Or using ghci:
> import Bindings.K8055 > withDevice Card1 (readAllDigital >>= print) 0