FTM Issue

yashkumar — Fri, 22 Sep 2017 17:00:11 GMT

Hi ,

I am working on FTM module for S32K148 controller. I have initialize the module as Free running counter .as below.

Init_FTM0()
{
  PCC->PCCn[PCC_FLEXTMR0_INDEX] &= 0xFFFFFFFF ^ PCC_PCCn_CGC_MASK; 
  PCC->PCCn[PCC_FLEXTMR0_INDEX] |= PCC_PCCn_PCS(6);  
  PCC->PCCn[PCC_FLEXTMR0_INDEX] |= PCC_PCCn_CGC_MASK; 
  FTM0->MODE |= FTM_MODE_FTMEN_MASK;                  
  FTM0->MOD = 40000;                                 
  FTM0->CNTIN = 0x00;
  FTM0->SC |= FTM_SC_TOIE_MASK   | FTM_SC_PS(0)  FTM_SC_CLKS(3);  
  /* Enable IRQ for FTM0 Over Flow Interrupt */
  NVIC->ISER[(104/32)] = (1 << (104 % 32));    
}
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In handler i am just clearing the TOF flag and then toggling the LED as below:

//!Handler For FTM0
void FTM0_IRQHandler (void)
{
    if( FTM0->SC & FTM_SC_TOF_MASK )
    {
        /* Clear TOF flag */
        FTM0->SC &= 0xFFFFFFFF ^ FTM_SC_TOF_MASK;  
        /* Toggle LED */
         PTD->PTOR |= 1<<0;
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

In the above case each time counter over flow the 40000 , interrupt will trigger and control will come to FTM0_IRQHandler () .

now , i want that after the first time when interrupt trigger and FTM0_IRQHandler execute,My FTM0 module got stop after serving the ISR. And Never trigger again. Means not only IRQ but alos FTM0 become disable .So i modified the IRQHandler as below :

//!Handler For FTM0
void FTM0_IRQHandler (void)
{
    if( FTM0->SC & FTM_SC_TOF_MASK )
    {
        /* Clear TOF flag */
        FTM0->SC &= 0xFFFFFFFF ^ FTM_SC_TOF_MASK;  
        /* Toggle LED */
        PTD->PTOR |= 1<<0;
        FTM0->MODE  &= (~FTM_MODE_FTMEN_MASK);
     /* Disable the IRQ for OverFlow */
     NVIC_ICER[104/32] = NVIC_ICER[110/32]& (1<< (104 % 32));
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

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But , durring debugging i am seeing the counter is still running and FTM0->CNT still increment . I want that it stop.

Could you please , help me here. actually i am little bit confuse which bit should use to stop the FTM0 Module after serving the interrupt.

Thanks!

Re: FTM Issue

razva_tilimpea — Mon, 25 Sep 2017 10:19:32 GMT

Hi,

If you want to stop the counter you should set SC->CLKS to 0.

Best regards,

Razvan

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Re: FTM Issue