EPWM trip zone

Table of Contents

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

Introduction

This example configures ePWM1 and ePWM2 as follows

• ePWM1 has TZ1 as one shot trip source
• ePWM2 has TZ1 as cycle by cycle trip source

Initially tie TZ1 high. During the test, monitor ePWM1 or ePWM2 outputs on a scope. Pull TZ1 low to see the effect.

• ePWM1A is on GPIO43
• ePWM2A is on GPIO45

This example also makes use of the Input X-BAR. The external trigger pin is routed to the input X-BAR, from which it is routed to TZ1.

The TZ-Event is defined such that ePWM1A will undergo a One-Shot Trip and ePWM2A will undergo a Cycle-By-Cycle Trip.

External Connections

• GPIO60 is connected to GPIO64.
• EPWM9_A and EPWM10_A 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 FSI header (on ControlCard) pin 6 to pin 7
• Connect FSI header (on ControlCard) pin 8 to scope
• Connect FSI header (on ControlCard) pin 5 to scope

AM263X-LP

Supported Combinations

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

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
• When the trip input TZ is high, 2 EPWMs generate PWM waveforms.
• When trip input is pulled low , 2 EPWMs gets tripped.

See Also

EPWM

Sample Output

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

EPWM Trip Zone Test Started ...
TZ OST interrupt hit 1 times!!
TZ OST interrupt hit 2 times!!
TZ OST interrupt hit 3 times!!
TZ OST interrupt hit 4 times!!
TZ OST interrupt hit 5 times!!
TZ OST interrupt hit 6 times!!
TZ OST interrupt hit 7 times!!
TZ OST interrupt hit 8 times!!
TZ OST interrupt hit 9 times!!
TZ OST interrupt hit 10 times!!
TZ CBC interrupt hit 1 times!!
TZ CBC interrupt hit 2 times!!
TZ CBC interrupt hit 3 times!!
TZ CBC interrupt hit 4 times!!
TZ CBC interrupt hit 5 times!!
TZ CBC interrupt hit 6 times!!
TZ CBC interrupt hit 7 times!!
TZ CBC interrupt hit 8 times!!
TZ CBC interrupt hit 9 times!!
TZ CBC interrupt hit 10 times!!
EPWM Trip Zone Test Passed!!
All tests have passed!!

EPWM Trip Zone waveform