Introduction

Diagram featuring the DeadBand working in EPWM

Example Description

The Example sets up the following EPMWs to showcase the Deadband features, as follows,

CONFIG_EPWM0 : Deadband disabled (Reference)
CONFIG_EPWM1 : Deadband Active High
CONFIG_EPWM2 : Deadband Active Low
CONFIG_EPWM3 : Deadband Active High Complimentary
CONFIG_EPWM4 : Deadband Active Low Complimentary
CONFIG_EPWM5 : Deadband Output Swap i.e., (switch A and B outputs)

CONFIG_EPWM6 : Deadband On Rising and Falling edges.

The sequence of operations to obtain the deadband occur in the following manner,

Input (EPWMx_A or EPWMx_B) is selected for operation
Rising edge delay operation (if selected)
Falling edge delay operation (if selected)
Inversion of the RED / FED output (if selected)
Output Swap (if selected)

Note :

All the EPWM in the example are synced with CONFIG_EPWM0 as its Counter reaches 0 and all EPMWs start counting up from 0 when sync pulse reaches.

EPWM DeadBand Example Block Diagram

External Connections

AM263X-CC

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

CONFIG_EPWM0 output on HSEC PIN 49 (EPWM0_A)
CONFIG_EPWM0 output on HSEC PIN 51 (EPWM0_B)
CONFIG_EPWM1 output on HSEC PIN 53 (EPWM1_A)
CONFIG_EPWM1 output on HSEC PIN 55 (EPWM1_B)
CONFIG_EPWM2 output on HSEC PIN 50 (EPWM2_A)
CONFIG_EPWM2 output on HSEC PIN 52 (EPWM2_B)
CONFIG_EPWM3 output on HSEC PIN 54 (EPWM3_A)
CONFIG_EPWM3 output on HSEC PIN 56 (EPWM3_B)
CONFIG_EPWM4 output on HSEC PIN 153 (EPWM13_A)
CONFIG_EPWM4 output on HSEC PIN 154 (EPWM13_B)
CONFIG_EPWM5 output on HSEC PIN 159 (EPWM15_A)
CONFIG_EPWM5 output on HSEC PIN 160 (EPWM15_B)
CONFIG_EPWM6 output on HSEC PIN 57 (EPWM4_A)
CONFIG_EPWM6 output on HSEC PIN 59 (EPWM4_B) Early Access:AM263Px-CC E1 EPWM 15_A/15_B doesn't have a pinout so insted used EPWM 5_A/5_B ie: CONFIG_EPWM5 output on HSEC PIN 61 (EPWM5_A) and CONFIG_EPWM5 output on HSEC PIN 63 (EPWM5_B)

AM263X-LP

Probe the following

CONFIG_EPWM0 output on PIN J2/4 11 (EPWM0_A)
CONFIG_EPWM0 output on PIN J6/8 59 (EPWM0_B)
CONFIG_EPWM1 output on PIN J2/4 37 (EPWM1_A)
CONFIG_EPWM1 output on PIN J2/4 38 (EPWM1_B)
CONFIG_EPWM2 output on PIN J2/4 39 (EPWM2_A)
CONFIG_EPWM2 output on PIN J2/4 40 (EPWM2_B)
CONFIG_EPWM3 output on PIN J6/8 77 (EPWM3_A)
CONFIG_EPWM3 output on PIN J6/8 78 (EPWM3_B)
CONFIG_EPWM4 output on PIN J6/8 79 (EPWM13_A)
CONFIG_EPWM4 output on PIN J6/8 80 (EPWM13_B)
CONFIG_EPWM5 output on PIN J2/4 34 (EPWM15_A)
CONFIG_EPWM5 output on PIN J5/7 45 (EPWM15_B)
CONFIG_EPWM6 output on PIN J2/4 35 (EPWM14_A)
CONFIG_EPWM6 output on PIN J2/4 36 (EPWM14_B)

Supported Combinations

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

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

Sample Output

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

EPWM DeadBand Test Started ...
EPWM DeadBand Example runs for 5 Secs
    Rising Edge timestamp of Reference waveform  :          502
    Rising Edge timestamp of Deadband Active High output B  :   502     (Same as Reference Rising Edge Timestamp)
    Rising Edge timestamp of Deadband Active High output A  :   902     (Reference Rising Edge Timestamp + Rising Edge Delay)
    Falling Edge timestamp of Reference waveform :          3502
    Falling Edge timestamp of Deadband Active High output A :   3502    (Same as Reference Falling Edge Timestamp)
    Falling Edge timestamp of Deadband Active High output B :   3702    (Reference Falling Edge Timestamp + Falling Edge Delay)
    Observed Rising Edege Delay :   400
    Observed Falling Edege Delay :  200
EPWM DeadBand Test Passed!!
All tests have passed!!

EPWM DeadBand Example Sample Capture

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