NUCLEO-L476RG Input Capture Is Not Capturing

[Rogers.Gary]

Hello:

Using IAR EWARM 7.8 for these tests. IAR provides working HAL examples for the STM32F4 Discovery boards. They have a specific example for both input capture, and PWM capture on the STM32F4 Discovery. Both examples work....both capture a 2KHz square wave in to the pins (PA9,PC7) for each example.

Over to the NUCLEO-L476RG. IAR provides an example for that, both timer input capture and PWM capture. Supposed to be ready to go and "tested". Ditto for CubeMX examples, under cube's folder version "STM32Cube_FW_L4_V1.13.0". Neither of those sources work on the Nucleo board...and I have two boards that are new.

I put a LED toggle in the interrupt TIMx_IRQHandler. Never lights it.

What gives....anyone tried these "tested" examples? Why would HAL work on the old Discovery board, and not on the Nucleo board?

Thanks....

[Tesla DeLorean]

Sure you've got it connected to the right pin? PA9 D8 on the Shield header.

[waclawek.jan · Accepted solution]

My crystal cube is completely hazy on this, but here are a few tips:

• make a basic loopdelay-based blinky with the LED. Blinks?
• write a simple copy from the input pin to the LED pin. Works?
• write a blinky with the timer/interrupt. Works?
• if by now the original example still does not work, read out and check the relevant TIM and GPIO registers content.

JW

[Rogers.Gary]

Hi Clive, Jan:

Thanks for taking the time to respond. It was me....guilty. The sig gen was adding a DC offset and causing convulsions on the capture. Once I discovered this, all is well.

Last night I tried reposting on another topic (cubeMX) it kept messaging something like "Check your internet connection"....apparently, every time I clicked "OK", it checked my connection by reposting the same thing, 6 times. Then I got locked out....something about search pages getting re-indexed. After some searching, looks like ST has some work to do on this new website.

Gary

[Amel NASRI]

Hi @Rogers.Gary​ ,

Thanks for coming back to update us on the status of your question.

Please submit any feedback you have regarding the Community platform in @About this community​  space.

-Amel

[Brian Kling]

Could you let me know Gary, what browser were you using?

[Rogers.Gary]

Thanks for asking....

it was Firefox Quantum 62.0.3 (64-bit) - yes, cache was flushed.

However, thinking it might be the issue, I had similar results on IE.

Gary

[Rogers.Gary]

Gee, you wouldn't happen to have one of those Teas instrument crystal balls, would you? I heard they impair vision really bad. 8=)

[Rogers.Gary]

Hi, what is "@About this community" space. Some kind of twitter feed or email? Anyhow...I replied to Brian. BTW - Still gettin that "Check your internet connection message right now even.......3 times in 2 mins

[Amel NASRI]

I am referring to this community space: https://community.st.com/s/group/0F90X000000AXs0SAG/about-this-community where we gather all platform related questions/feedback.

-Amel