VeriFone MX800 Series - Dspsetbrightness()

DEVICE DRIVERS
dspSetBrightness()
M
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800 SERIES PROGRAMMERS GUIDE 131
dspSetBrightness()
Allows the display brightness to be adjusted. If direction is 1, the brightness will be
increased. If direction is 0 the brightness will be decreased. There are 32 discrete
brightness settings. The brightness can be adjusted significantly by repeated calls
to dspSetBrightness. On power up, the brightness is set to 16 (of 32 steps).
The environment variable, *BACKLIGHT should be set (value: 1-32) if the
backlight is to be permanently changed from default.
Prototype
short dspSetBrightness(short direction);
Return Values
NOTE
When the brightness is set to 0, the backlight will turn off.
0OK
<0 Brightness at max/min setting