STM32 TIMERS #4. INPUT CAPTURE || Frequency and Width 

bro send that code please my code live expression shows 0 always

bro same issues bro.. can you solve this ?

You can first only enable the rising edge interrupt. Once it is detected and callback is called, enable falling edge also.

I am feeding it manually. We need some signal to test the IC right, the signal come from the output of another timer.

Yes timer1's output is connected to the timer2's pin. Ic capture callback is not triggered by tim1, its triggered by tim2

@@ControllersTech Thank you, now I understand!

I don't know about this. Never faced such issue

Faced similar problem, My error was divide by zero. I was dividing a number by zero due to poor initialization.

You should connect PA8 and PA0, to provide signał which makes interupt. That important fact is not mentioned in the film.

You should connect PA8 and PA0, to provide signał which makes interupt. That important fact is not mentioned in the film.

Yes ofcourse

Haha right. Actually we can do something about it, but i didn't included that part. Or else the code would be a bit complicated.. Anyway like i said i will release another video using DMA, and such things are taken care in it..

A sine wave will be squared up by the schmidt-trigger input of the processor. Externally it will be a sine wave, but the processor will see a square wave.

The TIMCLOCK and PRESCALAR is used for calculating the input frequency. Basically we capture the counter value of timer2 for 2 triigers. Then we find the difference in the counter values and this difference is equivalent to the input frequency. But here we need to convert the difference we got, to the frequency or time equivalent. To do so, we need to know at what rate our counter is running. That's why we use the clock of tim2. For eg- if counter is running at 1000hz, then the difference of 10 means the frequency is 100hz. And if the counter is running at 1MHz, then the same difference of 10 means the freq is 100khz. So it depends on the counter rate and hence we use the values of the timer, which is actually capturing.

Nothing

Its already present on the channel. Atleast search for things before asking about it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ti_1ZwRolU4.html

You should use external interrupt for this. Set the interrupt to both rising and falling edges. Define a 32 bit variable in the main file and desfine it as an external variable in the interrupt.c file. Increment the variable in the systick handler. When the interrupt is triggerd due to rising edge, reset the varibale. And when it is triggered due to falling edge, measure its value.

Can you please give some more insight currently interrupt for rising and falling edge is configured.

Thanks

You should connect PA8 and PA0, to provide signał which makes interupt. That important fact is not mentioned in the film.

Lets assume the pulse goes high when you press the button and low when you release it. Just measure the width between the high and low pulse. Then program your controller as per that width. If (width > 300ms) then long press triggered.

Read the description..

No. It's just premiere..

@@ControllersTech thanks a lot for your valuable videos sir. Thanks for your efforts

What time ? Point the timeline

@@ControllersTech it 2:57 you choose INTERNAL CLOCK, but CLOCK CONFIG you use HSE

Thats the clock for the timer. It is clocked by the APB clock.

@@ControllersTech i know , but when we use Timer always choose INTERNAL CLOCK ? , beacause i dont use INTERNAL CLOCK it no problem

Vhoosing the type of clock changes the timer operation mode. You can read more about it in the reference manual of your controller