Hi,
I am new to QT and i am trying to do a small GUI with QT on
OMAP3530.
I started with some sample programs. I created a button and when i
press the button using the touch screen lcd display it inturn executes the
demo application which comes with the OMAP3530 board. This is working
fine. The demo application configures FBDEV drivers i.e " fb0 " for
getting the output displayed on the lcd screen.
Problem: I tried to do the same with the decodecombo application and i
am not able to do that. It is giving different types of errors like " page
allocation failure ", " could not allocate buffers ".
I tried the same with a sample codec of mine which
uses V4L2 drivers for configuring video and no fb0 drivers it does not
run. It is failing to display the output of my codec and it is showing the
touch screen module on the screen. It is failing at the condition which is
before the copying of my data to display buffer.
ret = ioctl(display_fd,
VIDIOC_DQBUF, &buf);
if(ret<0) {
perror("VIDIOC_DQBUF"); return -1; }
I read somewhere that touch screen display uses fb0
drivers for configuring. I noticed that when i use an application with fb0
drivers it is working fine and when i use V4L2 drivers i am not able to
run my applicaion using GUI.
Anyone who have worked on this or know about this please
let me know hoe to do this.
Thanks and Regards,
Ravi Dev Chalanti
Tata Consultancy Services
Mailto: [email protected]
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