k66f FTM synchronization using external hardware trigger

teoman_ustun — Wed, 12 Feb 2020 02:14:38 GMT

Trying to do FTM counter synchronization using hardware trigger 2 (FTMx_FLT0), but had no luck so far. I could generate PWM signals though external hardware trigger does not reset the FTM counter. I also noticed that the FTMx_SYNC[TRIG2] is always 0, even though it is set to 1 in the peripheral.c program generated by MCUxpresso Config Tool.

I also tried manually changing the peripheral register directly in MCUxpresso, but it did not work - it always stays at 0 (zero) level. Any help is appreciated.

Re: k66f FTM synchronization using external hardware trigger

diego_charles — Thu, 13 Feb 2020 21:38:43 GMT

You could refer to the application note Features of the FlexTimer Module

Chapter 3.11.4. Updating the FTM register with hardware control to get a general code example in bare-metal for configuration of the hardware trigger of FTM of Kinetis MCU´s.

The following code configures the PTB3 pin as FTM0_FLT0. The FTM0_FLT0 is the hardware triggering source TRIG2. Every rising edge of trigger source2 launches a new PWM cycle.

Please take a close look at the register level configuration, because of implementation

FTM could vary between your device. , you will need to make sure that the correct bits are enabled.

The bit for hardware trigger 2 is set successfully in the example.

Also, note that the pins for PWM and FTM0_FLT0 must be routed, setting its corresponding alternative, you can use MCUxpresso config tools for that, as you were doing it before.

I hope that this reference helps you out!

Have a great day,
Diego

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topic k66f FTM synchronization using external hardware trigger in Kinetis Microcontrollers

k66f FTM synchronization using external hardware trigger

Re: k66f FTM synchronization using external hardware trigger