Query on TBCNT on epwm module of AM335x

Veena kudva

Prodigy 160 points

Hi,

I am trying to load a particular count value in the TBCNT register for the EPWM module .

For Example :

HWREGH(SOC_EPWM_1_REGS + EHRPWM_TBCTR) = 0x0000;

When I read back the count value using the following statement,

count = HWREGH(SOC_EPWM_1_REGS + EHRPWM_TBCTR);

I do not see the count value to be zero.

Has anyone faced this issue.

Thanks .

Regards,

Veena

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

What do you read?

0 Veena kudva over 10 years ago in reply to Biser Gatchev-XID

Prodigy 160 points

Hi,

I get some random number.

i am also giving a delay in between the write and read just to be sure the write happens , but no luck.

I am checking the "count" variable in the Debug mode.

Regards,
Veena

0 Biser Gatchev-XID over 10 years ago in reply to Veena kudva

TI__Guru**** 393215 points

From the AM335X TRM Rev. L section 15.2.4.5:

Reading these bits gives the current time-base counter value. Writing to these bits sets the current time-base counter value. The update happens as soon as the write occurs. The write is NOT synchronized to the time-base clock (TBCLK) and the register is not shadowed.

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Query on TBCNT on epwm module of AM335x