Hi,

I just bought a PhidgetTextLCD Display 20x2 and want to write an ANSI C program in the PhidgetSCB2 to allow me to write texts in the PhidgetTextLCD. I have the PhidgetSBC2 connected to PhidgetTextLCD via USB. I found an example program for the LCD (TextLCD-simple.c) in your corporate website in "Programming Resource" (phidget21-c-examples_2.1.8.20120514.tar.gz).

When I complie the programing, I get the following error.

root@xter:/usr/uCLCD# gcc x.c -lphidget21
x.c: In function 'display_properties':
x.c:53: warning: passing argument 2 of 'CPhidget_getDeviceID' from incompatible pointer type
/usr/include/phidget21.h:122: note: expected 'enum CPhidget_DeviceID *' but argument is of type 'enum CPhidget_DeviceClass **'
x.c:64: warning: comparison between pointer and integer
root@xter:/usr/uCLCD#

I have not amended the program in any shape or form except for renaming it from "TextLCD-simple.c" to "x.c"

I have attached the "x.c" file in this post.

Is there anything wrong I am doing that I might have blind sighted? Thanks.

Yes there was a typo in our sample code.

You can fix the problem by replacing

with

in the display properties function.

Thanks for identifying the problem.

Hi Fraser,

Thanks for your prompt reply. I have made the changes but I still get one more warning. The warning is as shown below.

root@xter:/usr/uCLCD# gcc x.c -lphidget21
x.c: In function 'display_properties':
x.c:53: warning: passing argument 2 of 'CPhidget_getDeviceID' from incompatible pointer type
/usr/include/phidget21.h:122: note: expected 'enum CPhidget_DeviceID *' but argument is of type 'enum CPhidget_DeviceClass *'
root@xter:/usr/uCLCD#

I have attached the modified "x.c" code.

Thanks.

make sure you use CPhidget_DeviceID not CPhidget_DeviceClass as well as remove the * from name

Oops! My bad as soon as I changed "CPhidget_DeviceClass" to "CPhidget_DeviceID", worked like a charm.

Thanks a bunch!