AN2979

Software description

Doc ID 15651 Rev 1

5/12

2

Software description

The software provided with this application note describes a way of implementing an A/D

converter (using a timer and analog comparator interrupts).

The application uses four peripherals:

●

CLK: the clock enables and provides the correct clock frequency for the peripherals.

●

COMP: the comparator detects when the input voltage is above the reference voltage

●

TIM2: Timer 2 provides the 2 ms PWM with a duty cycle of 0.25 generating the

capacitor charge and discharge. Timer 2 Capture/compare interrupt routine handles

the conversion.

●

GPIO: the general purpose I/O handles the I/O used.

●

SPI: used to communicate with the LCD.

A generic file param.h contains the parameter values that can be modified in order to re-use

the application and adapt it easily to other conditions.

At the start, the LCD displays “STM8L ADC using COMP”. Then it continously displays the

measured values.

Figure 3.

Application architecture & description

Note:

The software can be compiled with Cosmic and Raisonance compilers. It contains projects

for STVD and Raisonance IDE.

A calibration of some parameters can be optionally set if “#define Calibration” is

uncommented in the param.h file.

param.h

param.c

ai15372

main.c

stm8l10x.h

stm8l10x.h

stm8l10x.h

stm8l10x.h

stm8l10x tim

stm8l10x comp

stm8l10x tim

stm8l10x.comp

stm8l10x cl

stm8l10x api

stm8l10x cl

stm8l10x api

Application layer

API layer

Standard

peripheral drivers

STM8L101x

microcontroller