FTM0 clock configuration problem

leandro_f_rocco — Sat, 23 Mar 2019 16:05:44 GMT

Hi, I am using MCUXpresso IDE and FRDM-K64F board.

I am trying to configure four PWM channels using FTM0 at a frequency of 50hz. My definitions are the following:

#define FTM_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_McgFixedFreqClk)

#define FTM_MODULE FTM0
#define PWM_CH0 0U
#define PWM_CH1 1U
#define PWM_CH2 2U
#define PWM_CH3 3U

And my configuration code is the following:

ftm_config_t ftmInfo;
ftm_chnl_pwm_signal_param_t ftmParam[4];

   ftmParam[0].chnlNumber = (ftm_chnl_t)PWM_CH0;
   ftmParam[0].level = kFTM_HighTrue;
   ftmParam[0].dutyCyclePercent = 5U;
   ftmParam[0].firstEdgeDelayPercent = 0U;

   ftmParam[1].chnlNumber = (ftm_chnl_t)PWM_CH1;
   ftmParam[1].level = kFTM_HighTrue;
   ftmParam[1].dutyCyclePercent = 5U;
   ftmParam[1].firstEdgeDelayPercent = 0U;

   ftmParam[2].chnlNumber = (ftm_chnl_t)PWM_CH2;
   ftmParam[2].level = kFTM_HighTrue;
   ftmParam[2].dutyCyclePercent = 5U;
   ftmParam[2].firstEdgeDelayPercent = 0U;

   ftmParam[3].chnlNumber = (ftm_chnl_t)PWM_CH3;
   ftmParam[3].level = kFTM_HighTrue;
   ftmParam[3].dutyCyclePercent = 5U;
   ftmParam[3].firstEdgeDelayPercent = 0U;

   FTM_GetDefaultConfig(&ftmInfo);
   FTM_Init(FTM_MODULE, &ftmInfo);
   FTM_SetupPwm(FTM_MODULE, ftmParam, 4U, kFTM_EdgeAlignedPwm, 50U, FTM_SOURCE_CLOCK);
   FTM_StartTimer(FTM_MODULE, kFTM_FixedClock);

My problem is that the definition FTM_SOURCE_CLOCK is equal to 32552, but looking at my clock settings, the value of FTM_SOURCE_CLOCK should be 390625.

Below, is my clocks configurations. Can you help me with this problem?

Thanks.

Re: FTM0 clock configuration problem

Alice_Yang — Wed, 27 Mar 2019 09:06:57 GMT

Hello Leandro Fabián Rocco ,

I test on my side, configure the MCGFFCLK to 390.625KHZ, then get the freq using:

CLOCK_GetFreq(kCLOCK_McgFixedFreqClk);

the result is the same with Config tool:

You can send your project to me, I will help to check it .

Hope it helps,

Have a great day,
TIC

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FTM0 clock configuration problem

Re: FTM0 clock configuration problem