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CCS/TMS320F28379D: ePMW setting for ADC timing

kyungin nam
Intellectual 490 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE

Tool/software: Code Composer Studio

For ADC, I have a code as follow in 'examples_setup.h'

=========================================================

#define CPU_FRQ_200MHZ 1

#define ADC_SAMPLING_FREQ 25000.0L

#define EPWM_HSPCLKDIV 1

#define EPWM1_PERIOD 2000

#define EPWM1_DUTY_CYCLE 1000

#define EPWM2_PERIOD 200000

#define EPWM2_DUTY_CYCLE 100000

=========================================================

Does ADC use EPWM1 and EPWM2 both? or just use EPWM1?

 

Also, In case of using sampling frequency as 26kHz,

I calculated EPWM DUTY CYCLE and PERIOD values and they are not exact integer.(ex:1290.1229)

In that case, should I use just '1290' instead of '1290.1229'?

  • 0
    TI__Expert 5940 points
    Hello,

    EPWM1 to EPWM12 can be used as the trigger for the ADC SOC configuration.

    The TBPRD and CMPx registers should be set to integer values. If more resolution is required, I recommend using the HRPWM peripheral and configuring the TBPRDHR and CMPxHR registers appropriately.

    If you haven’t already, you can refer to the ADC and HRPWM chapters of the TRM for more details and the device support directory in C2000Ware or controlSUITE for example projects.

    Regards,
    Elizabeth
  • 0 in reply to Elizabeth Joy
    Intellectual 490 points

    Thank you.

    In your reply, ePWM12 means ePWM2?

  • 0 in reply to kyungin nam
    TI__Expert 5940 points
    I mean EPWM1 to EPWM12, as in EPWM1, EPWM2, .., EPWM12 can be used.

    Regards,
    Elizabeth
  • 0 in reply to Elizabeth Joy
    Intellectual 490 points
    Dear Elizabeth,

    Thank you for your reply.

    Also, as you said, I'm trying to find adc_hrpwm example in 'ControlSUITE'.

    And. I think I cannot find it.

    Would you mind if I ask you the title of example code?

    Thank you.
    Sincerely
  • 0 in reply to kyungin nam
    TI__Expert 5940 points
    You could take a look at adc_soc_epwm, hrpwm_duty_sfo_v8, and hrpwm_prdupdown_sfo_v8 examples as a starting point to better understand the possible functionalities of these modules and how you can use them for your project.

    Regards,
    Elizabeth