topic iMX6 General Purpose Timer in i.MX Processors

iMX6 General Purpose Timer

dirkschäfer — Sat, 06 Feb 2016 14:51:15 GMT

Hello all,

I start the clock for the GPT by writing the bits 20-23 in CCM_CCGR1.

Set the prescaler register to 0, reset the GPT, writing 1<<15 to the control register, waiting until (1<<15) is 0.

Writing 1<<18 + 1<<16 + 1<<9 + 4<<6 + 1

capture on rising edge

restart mode

low frequency clock

enable

The counter register, 0x02098024, stays 0, so the status register.

Did I forgot something?

Many thanks for your help.

igorpadykov — Sun, 07 Feb 2016 11:15:45 GMT

Hi Dirk

one can verify input signal, it should be stable at least for two low frequency clocks

also check attached example from sdk and its description in chapter14.

Best regards

igor

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dirkschäfer — Mon, 08 Feb 2016 09:15:03 GMT

Following IMX6DQRM.PDF

// disable

control= 0;

m_ctlReg.SetValue( control);

// peripheral clock

control |= 1<<6;

m_ctlReg.SetValue( control);

// software reset

control |= (1<<15);

m_ctlReg.SetValue( control);

while( (m_ctlReg.GetValue()&(1<<15)) != 0 );

// remove SWR bit

control &= ~(1<<15);

// Status reset

m_statusReg.SetValue(0x0000003F);

// ENMOD, resets counter & prescaler

control |= 2;

m_ctlReg.SetValue(control);

// start

control |= 1;

m_ctlReg.SetValue(control);

Counter counts.