FTM0 Operation

[prahsman]

I want to use FTM0 on the K70 to generate a 60Hz pulse. My code is in the attachment. The issue is nothing comes out on the PTD6 pin. I've checked the register values using a debugger and they all show correct except FTM0_C6V and C7V which show all zeros. Any ideas as to what is wrong?

Original Attachment has been moved to: FTM-Handler.c.txt.zip

[pavel_krenek]

Hi Keen,

I little bit try some settings on FTM in COMBINE mode. The following setting is functional. I used your settings and little modification. Very important is using pwmload after any of changing of value regiter and also use software trigger.

     // Disable clock, prescaler = /128; up counter

  FTM0_SC = FTM_SC_PS(7);

  FTM0_MODE = (FTM_MODE_FTMEN_MASK);  //enable all regs

  FTM0_QDCTRL &= ~FTM_QDCTRL_QUADEN_MASK;

  FTM0_C6SC = 8;             //ELSB = 1, ELSA = 0       

  FTM0_CNTIN = 0;            //initial counter value

  FTM0_COMBINE &= ~FTM_COMBINE_DECAPEN0_MASK;

  FTM0_COMBINE = FTM_COMBINE_COMBINE3_MASK;  //combine ch 6 & 7

  FTM0_OUTINIT = 0;          //initial output = low

  FTM0_MOD = FTM_MOD_VALUE;  //final count

  FTM0_C6V = channel_val0;  //count at which output goes high

  FTM0_PWMLOAD |= FTM_PWMLOAD_CH6SEL_MASK;

  FTM0_C7V = channel_val1;  //count at which output goes low

  FTM0_PWMLOAD |= FTM_PWMLOAD_CH7SEL_MASK;

  FTM0_SC |= FTM_SC_CLKS(1); //enable by selecting sys clk

  FTM0_SYNC |= FTM_SYNC_SWSYNC_MASK;

I hope, this help,

regards,

Pavel