topic Re: KE04 FTM OUTPUT COMPARE MODE in Kinetis Microcontrollers

KE04 FTM OUTPUT COMPARE MODE

jun1 — Wed, 16 Oct 2019 07:57:04 GMT

HI.

Thank you for your kindness.

I ask a question about the title. A sample source and Waveform screenshot attached.
(This is a modified version of SDK_2.6.0_MKE04Z128xxx4 \ boards \ frdmke06z \ driver_examples \ ftm \ output_compare)

・ Question
Modified to not output from the port. I set the FTM output port (PTC0 in this example) to GPIO output and toggle it with an FTM interrupt, but I can't. The neighboring PTC1 toggles, so I think the GPIO settings are correct.
What is missing?
According to the manual, if ELSnB: ELSnA = 00, the pin-channel pins not used for FTM are returned to general-purpose I / O or other peripheral device control.

Thank you.

jun.

Re: KE04 FTM OUTPUT COMPARE MODE

nxf56274 — Wed, 16 Oct 2019 08:36:24 GMT

Hi,

Maybe the parameter is "kFTM_ToggleOnMatch"

Re: KE04 FTM OUTPUT COMPARE MODE

jun1 — Wed, 16 Oct 2019 13:22:39 GMT

Hi.

Sorry for lack of explanation. If it is that parameter, it will toggle output, but all I want is timer interrupt and I don't want FTM port output. I want to do port output at another timing in another task. What should I do in this case? Is it possible to access GPIO corresponding to FTM with software?

jun

Re: KE04 FTM OUTPUT COMPARE MODE

jun1 — Wed, 16 Oct 2019 13:35:02 GMT

Hi.

Thank you for your answer.

There was not enough explanation. I don't need output port access and just want to use FTM as a timer interrupt. I want to use FTM1 channels 0 and 1 for MODBUS T1.5 and T3.5 timers. Can the output compare mode be used for these two timers?

Jun

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Re: KE04 FTM OUTPUT COMPARE MODE

nxf56274 — Thu, 17 Oct 2019 00:49:58 GMT

Hi,

In function "BOARD_InitPins" , did you set the PTC0 as a FTM channel? If so, please comment it.

Re: KE04 FTM OUTPUT COMPARE MODE

jun1 — Thu, 17 Oct 2019 01:48:59 GMT

Hi.

Commented out but the same. Can't toggle. Attach the source.
Can I update GPIO with software even in FTM output compare mode?

jun.

Re: KE04 FTM OUTPUT COMPARE MODE

nxf56274 — Thu, 17 Oct 2019 03:26:38 GMT

Hi,

The second parameter is the pin number. PTC0 should set 0 , not 1u<<1. "1<<1" is PTC2

Re: KE04 FTM OUTPUT COMPARE MODE

jun1 — Thu, 17 Oct 2019 03:45:29 GMT

Hi.

Thank you for pointing out the mistake.
it is complete.

best regard.

jun.