FDI LP3180, User Manual, Page: 37 / 40

FDI
NXP LPC3180 Demo
User’s Manual
FDI
Rev 2 Page 37 9/7/2007
12. FBIO_CONTRASTMINUS
a. Purpose: Decrements the screen’s contrast adjustment by 1. If the
contrast adjustment is at its lowest possible value, this command has no
effect.
b. Arguments: None
c. Returns: 1 on failure, 0 on success
d. Example:
if (ioctl(fbfd, FBIO_CONTRASTMINUS)) {
printf("Error decreasing screen contrast.\n");
exit(1);
}
13. FBIO_BRIGHTNESSPLUS
a. Purpose: Increments the screen’s brightness adjustment by 1. If the
brightness adjustment is at its highest possible value, this command has no
effect.
b. Arguments: None
c. Returns: 1 on failure, 0 on success
d. Example:
if (ioctl(fbfd, FBIO_BRIGHTNESSPLUS)) {
printf("Error increasing screen brightness.\n");
exit(1);
}
14. FBIO_BRIGHTNESSMINUS
a. Purpose: Decrements the screen’s brightness adjustment by 1. If the
brightness adjustment is at its lowest possible value, this command has no
effect.
b. Arguments: None
c. Returns: 1 on failure, 0 on success
d. Example:
if (ioctl(fbfd, FBIO_BRIGHTNESSMINUS)) {
printf("Error decreasing screen brightness.\n");
exit(1);
}
NOTE: In addition to the IOCTL commands above, the IOCTL calls
FBIOGET_FSCREENINFO and FBIOGET_VSCREENINFO are also available through
the generic Linux framebuffer interface.