Explain values of ICU

[ruslanpopov]

Using PWM-ICU example for STM32F100 and Tectu's Servo Library, I create own test application:
https://github.com/RaD/armka_demos/blob ... ter/main.c

Then I have connected PWM output (PB9) with ICU input (PA0) with a wire.

Following values in disconnected state:

Code: Select all

Period: 708 Width: 676

Following values in connected state:

Code: Select all

Period: 1 Width: 1

Just don't understand how to use them. I think that Period has to be about 36000 and width about 12000.

How to check that PWM frequency is 36kHz?

[ruslanpopov]

This question is important for me, answer please.

[Giovanni]

I don't understand your question well.

If you connect a PWM output to an ICU input the ICU driver returns exactly the same values you put in the PWM driver. The PWM-ICU application demonstrates this.

I would check if your pins are:
1) Unconnected on your board.
2) Programmed using the correct alternate function number.

How to check that PWM frequency is 36kHz?

Using a frequency meter or an oscilloscope.

Giovanni