LIN demonstration software

AN4178

10/13

Doc ID 23745 Rev 1

4.3.2

Software modules

main

This module contains the initialization routines and the main loop.

appli

This module contains the application’s main tasks:

●

reading the status of the USER1 and USER2 buttons, and updating the corresponding

signals in the LIN frame that will be sent to the STM8AF LIN master board

●

updating the status of the LEDs according to the signals read in the LIN frame received

from the STM8AF LIN slave board

If the LIN communication is broken, the application will switch on the red LD3 LED.

l99pm62drv

This module contains the driver for the L99PM62GXP device, which is controlled by the

STM8AF microcontroller through SPI.

If the L99PM62GXP device reports an error to the STM8AF through SPI, the software will

switch on the red LD3 LED. The other LEDs will give additional information as follows:

●

LD4 on: SPI error

●

●

LD6 on: thermal shutdown

lin

This module contains the LIN driver state machine described in Section 3.2.1: LIN state

machine.

stm8l15x_it

This module contains the following interrupt routines:

●

External interrupt of the pin1 routine, and update of the UserButton1 software flag,

when a falling edge is detected on the PE1 port

●

External interrupt of the pin2 routine, and update of the UserButton2 software flag,

when a falling edge is detected on the PE2 port

●

TIM4 interrupt routine, setting timebase ticks for LIN, CAN (not used in demonstration

software), application, and L99PM62GXP watchdog refresh

●

LINUART receive/error interrupt routine, which implements the algorithm described in

Section 3.2.2: LINUART interrupt

4.3.3

STM8S/A standard peripheral library modules

The demonstration software is based on the STM8S/A standard peripheral library version

2.1.0, dated November 2011.