AM62X-RESTRICTED-SW: The TZ function setting for AM62X PWM does not work

Hi, I will take a look, allow a day or two to come back to you

Paula

Hi,any update?

Hi Ye, sorry for my late reply.

After code inspection, one thing that you can try is to enable TZ0 at the beginning and configure Trip Actions to see if output works, something like below snipped code

    /* Configure trip zone Submodule */
    /* Enable TZ0 input as trip source for cycle-by-cycle trip */
    EPWM_tzTripEventEnable(gEpwm0BaseAddr, EPWM_TZ_EVENT_CYCLE_BY_CYCLE, 0U);
    /* Configure trip actions - force outputs low on trip */
    EPWM_tzTriggerTripAction(gEpwm0BaseAddr, PWMSS_EPWM_TZCTL_TZA_LOW_STATE, EPWM_OUTPUT_CH_A);
    EPWM_tzTriggerTripAction(gEpwm0BaseAddr, PWMSS_EPWM_TZCTL_TZB_LOW_STATE, EPWM_OUTPUT_CH_B);

FYI, we have an example EPWM TZ for AM243x in our MCU+SDK: AM243x MCU+ SDK: EPWM trip zone 

AM243x example is a bit different as it doesn't configure Trip Action, it is more a SW PWM functionality test (GPIO High -> TZ triggers -> Semaphores/ISR -> clear and increase counters -> next loop iteration).

Another main difference I observed was in AM243x's EPWM TZ code uses SOC_allowEpwmTzReg() function for temporarily enabling writes. This SOC function is not in AM62x SOC driver, so probably not needed.

In any case, there are some differences, but still, it is a working example if you want to take a look.

thank you,

Paula

Hi, I downloaded and read the AM243x examples, but they aren't referenceable because the drive library functions are all different. Could you please help write and test the TZ code based on the AM62x routine? This project is extremely urgent, and we're only blocking at this point. Thank you.

According to the requirements of TI's domestic FAE, I have made the modifications based on the TI routine with minimal changes. The three screenshots show the modifications compared to the original TI routine. Regarding the memory, I found that the registers related to TZ have not been modified correctly. The attachment includes the program package and memory information. I checked the register datasheet again and found no further configurable items.

4213.epwm_duty_cycle_sync_am62x-sk_m4fss0-0_freertos_ti-arm-clang.zipPWM0.dat

Please directly provide me with a usable configuration that only enables the TZ function, and just tell me directly how to configure it.

sync status from customer.

customer expects us to support them ASAP as they will get new PCB design and try to verify this feature in next week.

would you please help check the code change and register dump? then give suggestions? Customer hope TI can verify this feature on TI EVM then provide to them.

thanks a lot!

yong

Ye, Yong, I will start working in reproducing it. Please bear with me if I have further questions

Paula

Dear Anxiao.

would you please check if you need TZ event interrupt in your application?

Dear Paula.

I found there is no TZ interrupt number generated by sysconfig tool.

Also, I think TZ event interrupt only can route to ICSSM0 and GIC (A53), see below table in TRM. 

so this interrupt can not be routed to M4F, right?

thanks a lot!

yong

Hi Yong, your understanding is correct.

Thank you

Paula

We don't need the interrupt function; we only require the TZ-triggered PWM shutdown function (CBC). Please promptly conduct tests and verification based on TI's DV board. Thank you.