TMS320F28379D: QCLK of eQEP edge capture module

Part Number: TMS320F28379D

Tool/software:

Hello experts ,

Can you please tell me the actual value of QCLK which is the Unit position event frequency clock in (MHz)

Looking into the driverlib function "EQEP_setCaptureConfig" description:

//*****************************************************************************
//
//! Configures eQEP module edge-capture unit.
//!
//! \param base is the base address of the eQEP module.
//! \param capPrescale is the prescaler setting of the eQEP capture timer clk.
//! \param evntPrescale is the prescaler setting of the unit position event
//! frequency.
//!
//! This function configures the operation of the eQEP module edge-capture
//! unit.  The \e capPrescale parameter provides the configuration of the eQEP
//! capture timer clock rate. It determines by which power of 2 between 1 and
//! 128 inclusive SYSCLKOUT is divided. The macros for this parameter are in
//! the format of EQEP_CAPTURE_CLK_DIV_X, where X is the divide value. For
//! example, \b EQEP_CAPTURE_CLK_DIV_32 will give a capture timer clock
//! frequency that is SYSCLKOUT/32.
//!
//! The \e evntPrescale parameter determines how frequently a unit position
//! event occurs. The macro that can be passed this parameter is in the format
//! EQEP_UNIT_POS_EVNT_DIV_X, where X is the number of quadrature clock
//! periods between unit position events. For example,
//! \b EQEP_UNIT_POS_EVNT_DIV_16 will result in a unit position event
//! frequency of QCLK/16.
//!
//! \return None.
//
//*****************************************************************************

In the last line it says "For example, EQEP_UNIT_POS_EVNT_DIV_16 will result in a unit position event
frequency of QCLK/16."

But what is QCLK in the first place?

If i configure the function like this:

EQEP_setCaptureConfig(obj->qepHandle, EQEP_CAPTURE_CLK_DIV_128, EQEP_UNIT_POS_EVNT_DIV_32);

The capture timer clock will be SYSCLKOUT/128, if the system clock is 200 MHz, then this would be 200/128 = 1.56 MHz.

But what would the Unit position event frequency be?

Looking into the TRM i found this , but it dosn't help be calculate the value of QCLK.(unless it means 4 * 200 / 32 = 25 MHz?)

Kindly help!