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Bug in HRPWM in Piccolo ?

sunil barot
Intellectual 580 points

HRPWM messes up the PWM in the following condition.

I took the example "Example_2803xHRPWM_PrdUp_SFO_V6" for CCVV4 and changed following lines.

(*ePWM[j]).TBCTL.bit.HSPCLKDIV = TB_DIV2;
    (*ePWM[j]).TBCTL.bit.CLKDIV = TB_DIV2;     

It does not work right if the clock is slowed down by 4 or more. The counter goes beyond TBPRD.

Can somebody confirm that ? Is HRPWM suppose to work at full speed only ?

  • 0
    TI__Guru* 91175 points

    sunil barot said:

    HRPWM messes up the PWM in the following condition.

    I took the example "Example_2803xHRPWM_PrdUp_SFO_V6" for CCVV4 and changed following lines.

    (*ePWM[j]).TBCTL.bit.HSPCLKDIV = TB_DIV2;
        (*ePWM[j]).TBCTL.bit.CLKDIV = TB_DIV2;     

    It does not work right if the clock is slowed down by 4 or more. The counter goes beyond TBPRD.

    Can somebody confirm that ? Is HRPWM suppose to work at full speed only ?

    Sunil,

    Please refer to the HRPWM configuration checklist  (section 2.3.4.1 High-Resolution Period Configuration) in the HRPWM reference guide ( www.ti.com/lit/SPRUGE8)

    Item 3, bullet 2 indicates TBCLK must be set equal SYSCLKOUT.

    Regards,

    Lori