The display module must then interface to a separate "LCD controller" in the target system via an "LCD display bus". With larger displays, it is common that only "LCD driver" chips are located on the display module. LCD controller variants in the KS07xx family
Newer "LCD controllers" for smaller LCD screens usually have the "LCD driver" logic integrated on the chip.
#CODEVISIONAVR COMMANDS DRIVER#
So it is the "LCD controller" type that determines which LCD driver library package is to be used. The software libraries can only "see" I/O registers and video memory in the "LCD-controller". "LCD drivers" normally interface to an "LCD-controller".Īn "LCD-controller" holds the video image in RAM memory, and provides the normal data bus interface to the microprocessor.
#CODEVISIONAVR COMMANDS UPDATE#
To the signal voltage levels needed by the LCD screen, and to ease the update of a whole pixel matrix line at The job of the driver is both to convert the normal logic signal levels used by the processor system
Inconvenient to use compilation switches, then the library may include separate initialization modules forĭifferent sub-groups of the LCD-controller family members.Īn "LCD driver" chip drives the SEGment and COMmon video scan lines connected to the LCD screen. If differences in, for instance, hardware initialization methods or data and register access methods, makes it These differences are either handled by the LCD-driver library viaĬompiler-configuration switches or they may be ignored because they are not relevant for the However, such differences are mostly concerned with hardware-initialization features. The individual LCD controllers may come from different LCD-controller vendors.Īmong the LCD-controller family members, there may be minor differences in the number ofĬommands supported. The same LCD-driver software can be used with all variants in the LCD-controller family. Members of the same "family", because they are equivalent from a software point of view. LCD controllers that use the same basic command set and register layout are said to be (GUI test on PC with the real display module)
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