Input capture issue

[guillaumetiffin]

Hello,

I'm using MQX 4.0 with K60.

I would like to use input capture on Rising edge or falling edged.

I can't succeed to have counting.

Here is the code :

//Enable FlexTimer 3 Clock

    SIM_SCGC3 |= SIM_SCGC3_FTM3_MASK;; /* Enable clock for FTM3 */

PORTE_PCR10|= (0|PORT_PCR_ISF_MASK|PORT_PCR_MUX(6));

// FTM0_CH5

FTM3_MODE |= FTM_MODE_WPDIS_MASK;

FTM3_CNT = 0;

//reset the counter to zero

FTM3_MOD = 0xffff ;

//Set the overflow rate

FTM3_CNTIN = 0;

//Set the Counter Initial Value to 0

FTM3_MODE |= FTM_MODE_FTMEN_MASK;

// FLEX Timer0 configuration

FTM3_SC |= (FTM_SC_PS(0)| FTM_SC_CLKS(1));

// TOF=0 TOIE=0 CPWMS=0 CLKS=01 (system clock)  (divide by 1)

FTM3_C1SC = 0;

/* Clear channel status and control register */

FTM3_C2SC = 0;

/* Clear channel status and control register */

FTM3_C3SC = 0;

/* Clear channel status and control register */

FTM3_C4SC = 0;

/* Clear channel status and control register */

FTM3_C5SC = 0;

/* Clear channel status and control register */

FTM3_C6SC = 0;

/* Clear channel status and control register */

FTM3_C7SC = 0;

/* Clear channel status and control register */

FTM3_C5SC |= (0|FTM_CnSC_ELSA_MASK | FTM_CnSC_CHIE_MASK);

FTM3_MODE |= FTM_MODE_FTMEN_MASK;

FTM3_COMBINE = 0;

FTM3_QDCTRL = 0;

//Enable the counter to run in the BDM mode

FTM3_CONF |= FTM_CONF_BDMMODE(0);

Can you help me please ?

Regards,

Guillaume

[guillaumetiffin]

Hello, Mark and Soledad.

I will give you more details on waht I want to obtain.

I want to use the FTM 3 to count pulse on the channel 5.

I already have the FTM1 and FTM2 cofidured with quadrature mode.

When I configure the FTM3 in input capture mode, when I read the C5V register (for the channel 5), I always have 0.

I want to read the register periodically and reset it when I have read it.

I checked the signal which is on the GPIO and the signal is good.

The cofigured register seems to be correct. But the register still remain at 0.

I didn't found any documentation on it.

Is there something wrong in my code?

Regards,

Guillaume

[soledad]

Hi,

Please check the attached file, this may helps!!!

Have a great day,
Sol

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[mjbcswitzerland]

Guillaume

There is another discussion at the moment about this: Callback Overhead in KL03 running at 48 Mhz

With code that you can copy.

Regards

Mark

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