Function description

AN3298

14/27

Doc ID 18098 Rev 1

3

Function description

This section describes the most important STM8S DALI slave library functions for the user.

3.1

I/O pin driver layer functions

The I/O pin driver layer implements hardware dependent functions (designed for use with

STM8 devices and the DALI transceiver board).

3.1.1

stm8_interrupt_vector.c

This file contains the interrupt vector table. The I/O pin driver layer occupies six interrupt

vectors:

EXTI_PORTx_IRQHandler (five vectors)

The EXTI_PORTx_IRQHandler set of five vectors is for all GPIO pins (where x = A, B, C, D,

and E). They:

●

Detect DALI RX line changes

●

Allow the user to select any pin as a DALI RX line (because all GPIO vectors are

occupied).

TIM4_UPD_OVF_IRQHandler

This vector is for timer 4 overflow/update. It:

●

Controls the reception and transmission timing

●

Produces precise timer ticks for the DALI stack layer

3.1.2

stm8_it.c,

stm8_it.h

These files contain two interrupt service routines (ISR):

@interrupt void EXTI_PORTx_IRQHandler (void)

This ISR:

●

Calls receiving routines if there is a voltage level change on the DALI RX pin

●

Detects the start of the DALI packet. This ISR is inactive during DALI packet reception.

It is activated after DALI packet reception.