MIMXRT1180 how to output a pwm signal on the pin M16 - GPIO_AD_27

[silvio-vallorani]

Hi guys, 

I have a MIMXRT1189CVM8C.
I am not able to output a simple PWM signal from the pin M16 - GPIO_AD_27.

I have attached the screenshots of the MCUXpresso Config Tool which I set.

Can someone help me, please?

[silvio-vallorani]

My new related question is about a function I need to implement, but I can't figure out how to do it cleanly and possibly totally in hardware.

I have a periodic square signal generated by my application.
I need to generate a new periodic square signal that is 8 time more fast and that perfectly sync with the signal above, every it's rise edge.

In the Reference Manual I saw this block diagram:

However, going into more detail about the behavior of PWM_EXT_SYNC I found this block diagram:

It seems that the PWM peripheral is unable to simultaneously generate the PWM signal and synchronize with the external signal, is this true?

Can you help me to find a good solution for my needs?

Thank you very much,

Silvio

[mayliu1]

Hi @silvio-vallorani ,

Thanks for your updated information.

Q: It seems that the PWM peripheral is unable to simultaneously generate the PWM signal and synchronize with the external signal, is this true?

A: The FlexPWM module on i.MX RT1180 can simultaneously generate PWM outputs and synchronize its counter to an external signal.

For more detailed information, I suggest you can refer to this Application Note : AN14196: Flex Pulse Width Modulator (FlexPWM) Usage on MCX N Series | NXP Semiconductors,

especially Section 3.2.2 “Counter Synchronization”, which describes how the FlexPWM counter can be synchronized across modules or via external sources.

Best Regards

MayLiu

[silvio-vallorani]

Thank you @mayliu1 for your reply. I found the problem, it was related to the "fault disable" signals. I tryed to disable the beahviour that involve faults, using the "MCUX Config Tool" is not possible: if I uncheck all the "fault disable" signals, the generated code totally remove the PWM_SetupFaultDisableMap() call and the "fault disable map" register stay to it's all enabled by default. I think this is a buggy beahviour of the tool, beacouse if I uncheck all the "fault disable" signals from the tool and then I manually add the PWM_SetupFaultDisableMap() call with "0" as the mask, I obtain the expected behaviour.
Anyway, on my code I finally leave enabled all the "fault disable" signals and I added XBAR signals to route "InputLogicHigh" on "Flexpwm2Faultx" signals and that's works fine.

Now I have a new question, but I ask it as a separate message below.

[mayliu1]

Hi @silvio-vallorani ,

Thank you so much for your interest in our products and for using our community.

I suggest you can refer to SDK demo "evkmimxrt1180_pwm_cm33".

1: Pin Configuration :

In MCUXpresso Config Tools, set pin M16 (GPIO_AD_27) to function as PWM2_B (submodule 1).

2: Add PWM Initialization Code

Follow the SDK demo for PWM setup. The demo project uses PWM1 submodule 0, submodule 1, and submodule 2 to generate waveforms.
You can adapt the same method for PWM2 Submodule 1.

Best Regards

MayLiu