Hi, I need some input about a very simple application I'm about to make.

I need to poll the accelerometer, Carl Loodberg (is he a user here?) pointed me to this code snippet -> http://blog.medallia.com/2007/08/iph...source_co.html

I have installed the iPhone toolchain and tested it with a simple Hello World test.
But when I compile the code snippet from the link above I get these errors:

/usr/local/bin/arm-apple-darwin-ld: Undefined symbols:
_IOHIDEventGetFloatValue
_IOHIDEventGetType
_IOHIDEventSystemCopyMatchingServices
_IOHIDEventSystemCreate
_IOHIDEventSystemOpen
_IOHIDServiceSetProperty
_IOMasterPort
collect2: ld returned 1 exit status


Where are the IOHIDEvent calls defined? I guess I just neeed to load another headerfile?

ld errors are not related to headers, you may be missing a framework in your Makefile.

There is a good accelerometer demo in the lucasnewman motion demo app.

IIRC, those functions are in the IOKit framework, adding a "-framework UIKit" to the linker command should make it work.

Originally Posted by nop144666

IIRC, those functions are in the IOKit framework, adding a "-framework UIKit" to the linker command should make it work.

Cheers I'll try that.

EDIT: JUst checked my Makefile - I use that allready :/

That may be a problem with the declaration of the functions... Try adding a extern "C" before them if you are compiling in C++ or Obj-C++... I'm using Obj-C and the following Makefile, and it works ok:

CC=arm-apple-darwin-gcc
LD=$(CC)
LDFLAGS=-lobjc -framework CoreFoundation -framework CoreGraphics -framework GraphicsServices -framework Foundation -framework IOKit -framework UIKit -framework LayerKit

all: Grav

Grav: main.o GravApplication.o
$(LD) $(LDFLAGS) -o $@ $^

%.o: %.m
$(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@

clean:
rm -f *.o Grav

Originally Posted by nop144666

That may be a problem with the declaration of the functions... Try adding a extern "C" before them if you are compiling in C++ or Obj-C++... I'm using Obj-C and the following Makefile, and it works ok:

CC=arm-apple-darwin-gcc
LD=$(CC)
LDFLAGS=-lobjc -framework CoreFoundation -framework CoreGraphics -framework GraphicsServices -framework Foundation -framework IOKit -framework UIKit -framework LayerKit

all: Grav

Grav: main.o GravApplication.o
$(LD) $(LDFLAGS) -o $@ $^

%.o: %.m
$(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@

clean:
rm -f *.o Grav

Cheers, I'll take a look at it as soon as my 1.1.2 update is working..

Could you post your program here for us to have a look?

Already posted it here:
http://hackint0sh.org/forum/showpost...2&postcount=31

The outputs from the accelerometer - am I right in saying that it is percentage of 2G?
The datasheet says it is either 2G og 8G - if it is 2G, then it makes perfect sense that the Z axis hovers around 0.48 here where I am. (0.96G).

Am I correct on this?

Ok, I really need to know the samplerate of AcceleratedInx to get on with it (and to avoid using the ugly direct way)