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create a gap between two pwm signals

Martin Valencia
Guru 15175 points
Other Parts Discussed in Thread: HALCOGEN

I saw "RM46x 16/32-Bit RISC Flash Microcontroller Technical Reference Manual"(pag 767) that RM46 can generate a PWM signal three phases,


 I tried to generate epwm modules of Hercules RM46, but I can't configure the EPWM modules as master or slave, because I not find in the HALCoGen, the correct instructions for configuration

 try setting the HALCoGen, but I have not the result I want

I wonder if anyone has a sample code to synchronize two modules EPWM!!

  • 0
    TI__Guru 59540 points
    Hi Martin,

    I have forwarded your questions to one of our ePWM experts. They should get back with you shortly.
  • 0
    Guru 13625 points

    Hi Martin,

    I was able to sync of pwm with the following settings.

    When shifting the PWM phase, I have been used function below.

    etpwm.c : etpwmEnableCounterLoadOnSync()

    Regards,

    FSSer

  • 0 in reply to Sh.Sasaki
    TI__Mastermind 49120 points
    Hi Martin,

    The etpwmEnableCounterLoadOnSync() is the right function to use to create a phase delay between two PWMs. Were you able to create phase-shifted PWMs usign synchronized ePWM modules? Let me know if you need further help.

    Regards,
    Sunil
  • 0 in reply to Sh.Sasaki
    Guru 15175 points

    thank you very much for answering and excuse the delay regarding my answer, apparently notifications responses are failing immediately aplicare your response, thanks for the help!

  • 0 in reply to Sunil Oak
    Guru 15175 points
    thank you very much for your reply and I apologize for my delayed response, apparently in my account notifications E2E is failing, I'll have to talk to the supervisor for a solution, I thought no one had answered me, now aplicare advice immediately , thx
  • 0 in reply to Sh.Sasaki
    Guru 15175 points

    6011.ETPWM.rar

    implement the new settings, but failed the gap, I send my setup, maybe I'm leaving out some important detail 

    try to generate a signal of 60Hz, so I had to alter the VCLK4

    this way I get

    the code in the main program is:

    void main(void)
    {
    /* USER CODE BEGIN (3) */
    etpwmInit();


    etpwmEnableCounterLoadOnSync(etpwmREG2,35535,COUNT_UP);
    while(1);
    /* USER CODE END */
    }

  • 0 in reply to Martin Valencia
    Guru 15175 points

    First it is necessary to make these configurations:

    Then supplemented with the codes:

    int main(void)
    {
    /* USER CODE BEGIN (3) */
    etpwmDeadBandConfig_t pwm_deadband_config; // declarate variable
    etpwmInit();

    /*Setting of the offset angle between the generated PWMs*/
    etpwmSetSyncOut(etpwmREG1, SyncOut_CtrEqZero);
    etpwmSetSyncOut(etpwmREG2, SyncOut_EPWMxSYNCI); //SyncOut_CtrEqZero);

    etpwmDisableCounterLoadOnSync(etpwmREG1);
    etpwmEnableCounterLoadOnSync(etpwmREG2, 8300, COUNT_DOWN); // setting angle phase


    /*Dead Band Configuration*/
    pwm_deadband_config.halfCycleEnable = false;
    pwm_deadband_config.inputmode = PWMA_RED_PWMB_FED;
    pwm_deadband_config.outputmode = PWMB_FED_PWMA_RED;
    pwm_deadband_config.polarity = Invert_PWMB;
    /*Iniciando la carga de los valor de la banda muerta 1000---> 510 microsegundos*/
    etpwmSetDeadBandDelay(etpwmREG1, 1000, 1000);
    etpwmEnableDeadBand(etpwmREG1, pwm_deadband_config);
    etpwmSetDeadBandDelay(etpwmREG2, 1000, 1000);
    etpwmEnableDeadBand(etpwmREG2, pwm_deadband_config);

    while (1)
    ;
    /* USER CODE END */

    return 0;
    }

    Video of Aplicattion Here:

    Regards 

    Martin Valencia Alejo