topic Re: Help!! FTM2_C0V does not update. in Kinetis Microcontrollers

Help!! FTM2_C0V does not update.

josegardo — Thu, 13 Mar 2014 11:30:55 GMT

Hello,

I am using the FTM2 in Output Compare mode. This timers get the reference clock through external clock (100 KHz), so it overflows each 655.4ms. I am interested in using the Channel Match interrupt capabilities of this peripheral, but the content of FTM2_C0V is never updated. The reference manual said that this register is updated in the next count of FTM2 after FTM2_C0V was written (in my case, CLKS !=0 and FTMEN=0) but it always remains the same value. Check this simple code:

PE_ISR(FTM2_overflow)

{

FTM2_C0SC &= (uint32_t)~0x80UL; //Clear flag

sendUart(FTM2_C0V); //Print FTM2_C0V value

}

void setTimer(void)

{

FTM2_C0V=0x7FFF;

FTM2_C0SC &= (uint32_t)~0x80UL; //Clear flag to clean previous channel matches

FTM2_C0SC |= (uint32_t)0x40UL; // Channel match interrupt enabled

}

When setTimer function is called, UART send the FTM2_C0V value each 655.4 ms, but this value is always 0x0000 (the default value) instead 0x7FFF.

Thank you

Jose

Re: Help!! FTM2_C0V does not update.

Robinwithu — Thu, 13 Mar 2014 12:22:42 GMT

Hi,

can you tell me which controller you are using?

Thanks and Regards,

Robin

Re: Help!! FTM2_C0V does not update.

josegardo — Thu, 13 Mar 2014 12:39:57 GMT

I am using a Kinetis K30 microcontroller, the MK30DN512ZVLQ10.

Thanks,

Jose

Re: Help!! FTM2_C0V does not update.

Robinwithu — Thu, 13 Mar 2014 13:01:55 GMT

Hi Jose,

can you initilize your FTM_MOD to 0xFFFF , register in first case and see the result.

Regards,

Robin

Re: Help!! FTM2_C0V does not update.

Robinwithu — Thu, 13 Mar 2014 13:13:59 GMT

void setTimer(void)

{

FTM2_MOD=0xFFFF;

FTM2_C0V=0x7FFF;

FTM2_C0SC &= (uint32_t)~0x80UL; //Clear flag to clean previous channel matches

FTM2_C0SC |= (uint32_t)0x40UL; // Channel match interrupt enabled

}

Thanks n Regards,

Robin

Re: Help!! FTM2_C0V does not update.

josegardo — Thu, 13 Mar 2014 16:07:03 GMT

I have tried it but It does not work.

I was able to update the FTM2_C0V value stopping the counter CLKS=00 and the restarting again. But this solution is not valid for me. FTM2 is the synchornization time in a CDMA system and it can not be stopped. This is the code:

{void setTimer(void)

FTM2_SC &=(uint32_t)~0x18UL;

FTM2_C0V=0x7FFF;

FTM2_SC |=(uint32_t)0x18UL;

FTM2_C0SC &= (uint32_t)~0x80UL; //Clear flag to clean previous channel matches

FTM2_C0SC |= (uint32_t)0x40UL; // Channel match interrupt enabled

}

Any other solution?

Thanks,

Jose

Re: Help!! FTM2_C0V does not update.

Robinwithu — Thu, 13 Mar 2014 18:54:40 GMT

Hi Jose,

give me sometime i will look into that.if you will get the solution please post it.

Thanks n Regards,

Robin

Re: Help!! FTM2_C0V does not update.

josegardo — Fri, 14 Mar 2014 09:10:05 GMT

Hi Robin,

I'll do that.

Thanks

Jose

Re: Help!! FTM2_C0V does not update.

Robinwithu — Fri, 14 Mar 2014 09:12:40 GMT

Hi Jose,

so what was problem?

Thanks n Regards,

Robin

Re: Help!! FTM2_C0V does not update.

josegardo — Fri, 14 Mar 2014 10:19:31 GMT

Sorry, I mean that I'll post the solution if I resolve the problem.

Thanks

Re: Help!! FTM2_C0V does not update.

Robinwithu — Fri, 14 Mar 2014 10:36:01 GMT

Hi Jose,

can you mail me your complete code so that i can simulate on my pc.?

my email robinwithu@yahoo.co.in

Thanks n Regards,

Robin

Re: Help!! FTM2_C0V does not update.

josegardo — Mon, 17 Mar 2014 13:31:29 GMT

We have not found out the solution :smileysad:. Anyone can help me?

Re: Help!! FTM2_C0V does not update.

Wlodek_D_ — Mon, 17 Mar 2014 15:03:49 GMT

Dear Jose Garcia Doblado,

Thank you for your post, however please consider moving it to the right community place for better visibility.

For details please see general advice https://community.freescale.com/docs/DOC-99909

Thank you for using Freescale Community.

Regards,

Wlodek_D.