Structure of final user application

AN3298

10/27

Doc ID 18098 Rev 1

2

Structure of final user application

The final user application uses the DALI slave library and so, consists of the following three

layers:

●

Main user application

●

DALI stack layer

●

I/O pin driver layer

2.1

User application

The structure of the user application is shown in Figure 4. It is comprised completely of

STVD project files. The application code is in one source file, "main.c", in which the whole

user ballast control is implemented. This code calls the DALI slave library functions.

The user application example included in the DALI slave library package is designed to work

with the “STM8S discovery kit” and “DALI transceiver board”. The STM8S discovery kit is a

small printed circuit board (PCB) with an integrated STM8S105C6T6 device which

demonstrates STM8S capabilities. The DALI transceiver board is connected to the STM8S

discovery kit as a physical layer extension. It provides voltage level conversion and optical

isolation between the DALI bus and the STM8S discovery kit (according to the DALI

specification requirements).

Figure 4.

Structure of user application

The main task of the user application is to initialize the DALI stack and to implement the light

intensity control function (callback function). This function is ballast dependent. The user

application also periodically controls some event flags. If the DALI slave library sets an event

flag and it indicates a pending event, the user application must call the appropriate service

routines (from the DALI slave library) to execute the necessary commands.