Appendix - source code examples

AN2719

20/22

6.2.1

Program flow

In the main.c file is the main program loop - in function main(). At the beginning is the basic

MCU initialization: GPIO pins (LED diodes, buttons), CPU clock, interrupts. Then the main

testing loop begins - it consists of the ADC initialization and series of steps (methods).

Each test step contains a write to the LCD display to display information about the running

test and then contains the test routine itself. The test routines are provided in listed files -

each file for each method. To continue from one test to the next, the user must press a

button (joystick select button on evaluation board). After all tests are done, then the ADC is

reconfigured to higher speed and the test loop runs again.

Tests are:

●

TestADCAveraging();

–

ADC in single mode

–

averaging method applied

●

TestADCWhiteNoise();

–

ADC in continuous mode

–

averaging method applied

●

TestADCDigitalFilter50Hz();

–

ADC in single mode

–

external timer trigger

–

simple comb 50 Hz filter applied

●

TestADCFFT();

–

ADC in single mode

–

external timer trigger

–

16-point FFT applied

●

TestADCCalibration();

–

ADC in single mode

–

software start

–

simple linear model applied (offset and gain calibrated)

6.2.2

Hardware and software requirements

To run the project example you must have installed STVD (min. version 3.5.0) and Cosmic

compiler for STM8 family. Both tools are free for download from STMicroelectronics and

Cosmic websites.

The hardware requirement is to have STM8 evaluation board with STM8S - 128K chip

installed. Instead of a real STM8 chip you can use STice emulator.