ChibiOS Free Embedded RTOS

I was able to get frequency this way inside a function that needs this to perform PID calculations:

now = chTimeNow();
sampleFreq = 1.0 / ((now-lastupdate) / (CH_FREQUENCY / 1.0));
lastupdate = now;


However my code is running so fast that I'm getting always 1000Hz or 500Hz(only 1 ...

There is an example using DMA data to update TIM CCR from ST STM32F4 DSP lib. Maybe it could suit your requirement.

/**
@page TIM_DMA TIM DMA example

@verbatim
******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
* @file TIM/DMA/readme.txt
* @author MCD ...

Wow ! It is simple as you said.
Thank you very much for your help.

Hi,

Do you have any code snippets to show how to use this time measurement driver?

Thanks.

Thanks very much Giovanni.

I think I found my mistake. I set APB2 at 168MHz so I should use the frequency that makes the prescaler an integer.
Initially I thought that I could use any frequency that is less than APB2 and the prescaler calculation will take care of it. Obviously, if I use 20MHz, the ...

Hi,

I 'm not sure if you have come across this issue. It seems that I couldn't use more than 2 MHz for clock frequency when config the PWM.

I tried to create PWM signal of 10kHz frequency with complementary output + dead time so I config PWM as below (using 20MHz pwm clock frequency). But it ...