TRK-MPC5604P eTimer Quadrature

simbasoft — Sat, 01 Mar 2014 01:17:30 GMT

Hello,

I have created a simple setup with the TRK-MPC5604P EVB to test the eTimer quadrature function. The quadrature encoder is a simple rotary encoder I'm rotating it by hand. The encoder quadrature signals are connected to the PA0/PA1 pins. Electrically I'm able to scope the quadrature signal, it looks OK. But the counter does not count.

Any hints what is wrong and/or missing?

Thank you in advance.

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Here is the code:

void initAndRunEtimer(void) {

SIU.PCR[0].R = 0x0103; // PA0, eTimer_0, ETC[0]
SIU.PCR[1].R = 0x0103; // PA1, eTimer_0, ETC[1]

ETIMER_0.CHANNEL[0].COMP1.R =0xFFFF;

ETIMER_0.CHANNEL[0].COMP2.R = 0x0000;

ETIMER_0.CHANNEL[0].LOAD.R = 0x0000;

ETIMER_0.CHANNEL[0].CNTR.R = 0x0000;

ETIMER_0.CHANNEL[0].CTRL.R = 0x8000;

ETIMER_0.CHANNEL[0].CTRL2.R = 0x0000;

ETIMER_0.CHANNEL[0].CTRL3.R = 0x0000;

ETIMER_0.CHANNEL[0].STS.R = 0x0000;

ETIMER_0.CHANNEL[0].INTDMA.R = 0x0000;

ETIMER_0.CHANNEL[0].CMPLD1.R = 0x0000;

ETIMER_0.CHANNEL[0].CMPLD2.R = 0x0000;

ETIMER_0.CHANNEL[0].CCCTRL.R = 0x0000;

ETIMER_0.CHANNEL[0].FILT.R = 0x0000;

ETIMER_0.DREQ[0].R = 0x0000;

ETIMER_0.DREQ[1].R = 0x0000;

ETIMER_0.DREQ[2].R = 0x0000;

ETIMER_0.DREQ[3].R = 0x0000;

ETIMER_0.DREQ[4].R = 0x0000;

ETIMER_0.WDTOH.R = 0xFFFF;

ETIMER_0.WDTOL.R = 0xFFFF;

ETIMER_0.ENBL.R = 0x0001;

}

As soon as I rotate the encoder I get the following ETIMER_0.CHANNEL[0].STS Bit Field Values:

Not Implemented bits[ 15:10 ] = 0

WDF bits[ 9:9 ] = 1 Event occurred

RCF bits[ 8:8 ] = 0 No event

ICF2 bits[ 7:7 ] = 0 No event

ICF1 bits[ 6:6 ] = 0 No event

IEHF bits[ 5:5 ] = 1 Event occurred

IELF bits[ 4:4 ] = 1 Event occurred

TOF bits[ 3:3 ] = 0 No event

TCF2 bits[ 2:2 ] = 0 No event

TCF1 bits[ 1:1 ] = 0 No event

TCF bits[ 0:0 ] = 0 No event

Re: TRK-MPC5604P eTimer Quadrature

PetrS — Mon, 03 Mar 2014 12:25:04 GMT

Hi,

you have to select also proper primary and secondary source in CTRL register.

So with ETIMER_0.CHANNEL[0].CTRL.R = 0x8001 setting it should work.

Regards,

Petr

Re: TRK-MPC5604P eTimer Quadrature

simbasoft — Tue, 04 Mar 2014 13:18:09 GMT

Thank you for the quick response, Petr! That solved it.

topic Re: TRK-MPC5604P eTimer Quadrature in MPC5xxx

TRK-MPC5604P eTimer Quadrature

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Re: TRK-MPC5604P eTimer Quadrature