EQEP frequency measurement

Table of Contents

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

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

• Connect EPWM0A to EQEP2A (EPWM simulates EQEP signal)
• Connect J3 Pin 24 (EPWM0A) to J3 Pin 28 (EQEP2A)

Supported Combinations

Parameter	Value
CPU + OS	a53ss0-0 nortos
	r5fss0-0 freertos
	c75ss0-0 freertos
Toolchain	arm.gnu.aarch64-none
	ti-arm-clang
	ti-c7000
Board	am62ax-sk
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

See Also

EQEP

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!!