EPWM HR duty cycle SFO

Table of Contents

• Introduction
• External Connections
  • AM263X-CC
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example modifies the MEP control registers to show edge displacement for high-resolution duty cycle with ePWM in Up count mode due to the HRPWM control extension of the respective ePWM module.

Block diagram

External Connections

• EPWM0_A/B pin can be connected to an oscilloscope to view the waveform.

AM263X-CC

When using AM263x-CC with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)

• Connect HSEC 49 for epwm0_A
• Connect HSEC 51 for epwm0_B

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am263x-cc, am263x-lp
Example folder	examples/drivers/epwm/hrpwm_duty_cycle_sfo/

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 High Resolution Duty Cycle Test Started ...
Please observe pins HSEC 49 and HSEC 51.
High Resolution duty cycle 4.00 percent. (positive width = 20.000 nanoseconds)
EPWM0 CMP = 4, CMPHR = 0
 
Calibration... Running...
 
High Resolution duty cycle 4.15 percent. (positive width = 20.750 nanoseconds)
EPWM0 CMP = 4, CMPHR = 38
 
Calibration... Running...
 
High Resolution duty cycle 4.30 percent. (positive width = 21.500 nanoseconds)
EPWM0 CMP = 4, CMPHR = 76
 
Calibration... Running...
 
High Resolution duty cycle 4.45 percent. (positive width = 22.250 nanoseconds)
EPWM0 CMP = 4, CMPHR = 115
 
Calibration... Running...
 
High Resolution duty cycle 4.60 percent. (positive width = 23.000 nanoseconds)
EPWM0 CMP = 4, CMPHR = 153
 
Calibration... Complete
SFO status=1 , MEP_ScaleFactor=45
 
High Resolution duty cycle 4.75 percent. (positive width = 23.750 nanoseconds)
EPWM0 CMP = 4, CMPHR = 192
 
Calibration... Running...
 
High Resolution duty cycle 4.90 percent. (positive width = 24.500 nanoseconds)
EPWM0 CMP = 4, CMPHR = 230
 
…

Expected output