Introduction

This example uses the EQEP to measure frequency of a signal generated by ePWM.

The example does the below

Configures EPWM to generate a signal and EQEP to measure frequency of this generated signal (a loopback connection is required).
The application runs for the specified time and the frequency calculation is done using the EPWM ISR.
After the specified time, the application checks if the measured frequency was within range of the generated frequency.

External connections

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

Connect eQEP2A (J25 Pin 1) to ePWM0A (J2/J4 Pin 11) (simulates eQEP Phase A signal)
Connect eQEP2B (J25 Pin 2) to ePWM0B (J6/J8 Pin 59) (simulates eQEP Phase B signal)
Connect eQEP2I (J25 Pin 3) to GPIO48 (J2/J4 Pin 40) (simulates eQEP Index Signal)

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

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
View the UART console logs for results

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

EQEP Frequency Measurement Test Started ...

EQEP Frequency Measurement Test Passed!!