EQEP frequency measurement

Table of Contents

• Introduction
• External Connections
  • AM263X-CC
  • AM263X-LP
• 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 eQEP0A to ePWM0A (simulates eQEP Phase A signal)
• Connect eQEP0B to ePWM0B (simulates eQEP Phase B signal)
• Connect eQEP0I to GPIO48 (simulates eQEP Index Signal)

AM263X-CC

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

• Connect Boosterpack header Pin 11 to eQEP0/SFDM1 Header J24 Pin 1
• Connect Boosterpack header Pin 59 to eQEP0/SFDM1 Header J24 Pin 2
• Connect Boosterpack header Pin 40 to eQEP0/SFDM1 Header J24 Pin 3

AM263X-LP

• Connect eQEP0A to ePWM0A (simulates eQEP Phase A signal)
• Connect eQEP0B to ePWM0B (simulates eQEP Phase B signal)
• Connect eQEP0I to GPIO48 (simulates eQEP Index Signal)
• Connect Boosterpack header J2/J4 Pin 11 to J15 pin 2
• Connect Boosterpack header J6/J8 Pin 59 to J24 pin 3
• Connect Boosterpack header J2/J4 Pin 40 to J24 pin 2

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

See Also

EQEP

Sample Output

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

EQEP Frequency Measurement Test Started ...
EQEP Frequency Measurement Test Failed!!