FTM input clock source limitation

[aroste]

Hi,

I have a K60 and I used until now the internal bus clock for my timing.

I changed to use the FTM_CLKIN1 input as clock source and it works for my timer FTM1.  I have a 10Mhz 0.1ppm clock to generates a 10khz. => OK

Now I want to enable the FTM0 also with the same input clock source but PE doesn't allow me to do that. It says the clock source is already in use.  But I need it as it is the accurate clock source.

I supposed that this clock source can be use by any FTM flex timer

Could someone help with that? 

I wasn't able to find any limitation about that.

BR

-stéphan-

[aroste]

HI Pavel,

Thanks for your answer.  So it means it is an error in PE that causes this error? 

This is annoying since for those timers I use PE to generate my code.

I can maybe set another input, generates the files and correct them manually after that.  It's tricky since I will need to restore my update in case I modify a setting with PE.

BR

stéphan-

[pavel_krenek]

Actually I did not tested in PE but I think you have to set the SIM module via PE and after that should be available the external clock for any of flex timer module.

Regards,

Pavel

[aroste]

Hi,

I come late with an answer.

So I finally found the workaround.  I created the timer with PE, and just after the init call I have to set manually the SIM_SOPT4 because PE doesn't handle it properly.

	if (EventStruct.Out10Khz_UserDatas.DeviceDatas == NULL)
	{

        printf("FAILED to setup 10khz output!");

		_task_block();
	}
	else
	{
		// Missing from PE code generation !!!
		/* SIM_SOPT4: FTM1CLKSEL=1 */
		SIM_SOPT4 |= SIM_SOPT4_FTM1CLKSEL_MASK;
	}

[pavel_krenek]

Hi Stephan,

One external clock source can be used as input clock source for all flextimer modules. It depends only on setting on the register SOPT4. There are two external FTM_CLKINx pins that can be selected by any FTM module via the SOPT4 register in the SIM module.

I hope that help.

Pavel