AM263Px MCU+ SDK  11.00.00
EPWM UPDOWN-Count Action Qualifier

Table of Contents

Introduction

This example configures ePWM0, ePWM1 and ePWM2 (ePWM2, ePWM3 and ePWM4 in case of AM261x-LP) to produce an waveform with independent modulation on ePWMxA and ePWMxB. The TB counter is in up-down count mode for this example.

The compare values CMPA and CMPB are modified within the ePWM's ISR.

ISR Configuration

  1. INTXbar0, INTXbar1 and INTXbar2 are set for EPWM0INT, EPWM1INT and EPWM2INT (EPWM2INT, EPWM3INT and EPWM4INT in case of AM261x-LP)
  2. App_epwmIntrISR_x service this interrupts
    • Updates the CMPA and CMPB compare values at every 10'th interrupt as follows:
      • If CMPA/B is increasing, check if it reached max value. If not, increase CMPA/B else, change direction and decrease CMPA/B
      • If CMPA/B is decreasing, check if it reached min value. If not, decrease CMPA/B else, change direction and increase CMPA/B

EPWM Asymetric Waveform with Independent Modulation using UP-DOWN-Count mode

External Connections

  • EPWM0_A and EPWM0_B pin can be connected to an oscilloscope to view the waveform.
  • EPWM1_A and EPWM1_B pin can be connected to an oscilloscope to view the waveform.
  • EPWM2_A and EPWM2_B pin can be connected to an oscilloscope to view the waveform.

AM263X-CC or AM263PX-CC or AM261X-SOM

When using AM263x-CC, AM263Px-CC or AM261x-SOM with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)

  • Capture waveform on HSEC Pin 49 for epwm0_A
  • Capture waveform on HSEC Pin 51 for epwm0_B
  • Capture waveform on HSEC Pin 53 for epwm1_A
  • Capture waveform on HSEC Pin 55 for epwm1_B
  • Capture waveform on HSEC Pin 50 for epwm2_A
  • Capture waveform on HSEC Pin 52 for epwm2_B

AM263X-LP or AM263PX-LP

  • Capture waveform on boosterpack header J6/J8 Pin 11 for epwm0_A
  • Capture waveform on boosterpack header J6/J8 Pin 59 for epwm0_B
  • Capture waveform on boosterpack header J2/J4 Pin 37 for epwm1_A
  • Capture waveform on boosterpack header J2/J4 Pin 38 for epwm1_B
  • Capture waveform on boosterpack header J2/J4 Pin 39 for epwm2_A
  • Capture waveform on boosterpack header J2/J4 Pin 40 for epwm2_B

AM261X-LP

  • Capture waveform on boosterpack header J2/J4 Pin 40 for epwm2_A
  • Capture waveform on boosterpack header J2/J4 Pin 39 for epwm2_B
  • Capture waveform on boosterpack header J2/J4 Pin 38 for epwm3_A
  • Capture waveform on boosterpack header J2/J4 Pin 37 for epwm3_B
  • Capture waveform on boosterpack header J2/J4 Pin 36 for epwm4_A
  • Capture waveform on boosterpack header J2/J4 Pin 35 for epwm4_B

Supported Combinations

Parameter Value
CPU + OS r5fss0-0 nortos
Toolchain ti-arm-clang
Board am263px-cc, am263px-lp
Example folder examples/drivers/epwm/epwm_updown_aq

Steps to Run the Example

  • When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
  • When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
  • Establish connections as mentioned in External Connections section
  • Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

EPWM

Sample Output

Shown below is a sample output when the application is run,

EPWM Action Qualifier Module Test Started ...
EPWM Action Qualifier using UPDOWN-Count mode Example runs for 30 Secs
EPWM Action Qualifier Module Test Passed!!
All tests have passed!!