AN4101

LIN demonstration software

Doc ID 23127 Rev 1

15/21

lin

This module contains the LIN driver state machine described in Section 4.2.1: LIN state

machine.

adc

This module contains the ADC initialization routine, and the function for reading a converted

value on the ADC channel 8, mapped on the PE7 port.

can

This module contains the CAN communication functions which are used only by a hidden

test mode, and are not used in this demonstration software.

stm8s_it

This module contains the following interrupt routines:

●

External interrupt of the port E routine, and update of the UserButton1/UserButton2

software flag, when a falling edge is detected on the PE2/PE1 ports

●

CAN receive interrupt routine, which is not activated in the demonstration software (test

mode only)

●

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

Section 4.2.2: LINUART interrupt

●

ADC2 interrupt routine, which reads the converted value and stores it in the

Conversion_Value variable

●

TIM4 interrupt routine, which sets timebase ticks for LIN, CAN (not used in the

demonstration software), application, and L99PM62GXP watchdog refresh

7.2.3

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.

The following driver modules are used:

●

stm8s_exti.c, for the external interrupts on port E (USER1 and USER2 buttons)

●

stm8s_adc2.c, for converting the RV1 trimmer value

●

stm8s_can.c, for the CAN test mode (not used in the demonstration software)

●

stm8s_clk.c, for configuring clocks and enabling HSE

●

stm8s_gpio.c, for initializing, reading and updating all ports

●

stm8s_spi.c, for SPI communication with the L99PM62GXP device

●

stm8s_tim4.c, for generating a 1 ms timebase

●

stm8s_uart3.c, for initializing LINUART

Note:

LINUART is described as UART3 in the RM0016 STM8S and STM8A reference manual.