Introduction

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

Figure 1a. Block diagram

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.

Figure 1b. Implementation details

External connections

Connect ePWM0A to eQEP0A (EPWM simulates eQEP signal)

AM263X-CC or AM263PX-CC

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

Connect HSEC Pin 49 (ePWM0A) to HSEC Pin 102 (eQEP0A)

AM263X-LP or AM263PX-LP

Connect J2 Pin 11 (ePWM0A) to J25 Pin 1 (eQEP0A)

Supported Combinations

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

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
View the UART console logs for results

Sample Output

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

EQEP Frequency Measurement Test Started ...
Please ensure EPWM to EQEP loopback is connected...
Please wait 10 seconds ...
Expected frequency = 10000 Hz, Measured frequency = 10000 Hz
EQEP Frequency Measurement Test Passed!!
All tests have passed!!

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