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AN3128
Multi-input embedded GUI library
Doc ID 16918 Rev 5
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3.4
Library architecture
Library architecture is thought out and developed in two separate layers:
●
API layer
●
HAL layer
This layer architecture improves the code re-usability splitting the application programming
interface code (fully portable and re-usable) from the hardware abstraction layer code
(hardware dependent and written upon the LCD library).
Figure 5.
Firmware library architecture
3.4.1
API layer
The application programming interface layer allows the final application to use the library as
a black-box. The library firmware encapsulation feature and exported API allow a full control
of the LCD and touchscreen without knowing, in-depth, LCD registers and SPI/I2C
read/write operation steps for the LCD and touchscreen respectively.
●
The API layer includes the following files:
–
graphicObject.h
–
graphicObject.c
–
graphicObjectTypes
–
cursor.c
–
cursor.h
See Section 4.1 for a more detailed description.
3.4.2
HAL layer
The hardware abstraction layer is directly built into the specific LCD firmware library and
allows the build-upon layers, like the API layer, to implement its functions without knowing,
in-depth, the LCD, MCU and touchscreen controller used. This improves the library code re-



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