AM263Px MCU+ SDK: EQEP frequency measurement

| AM263Px MCU+ SDK 26.00.00 |

EQEP frequency measurement

# 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 | am263px-cc, am263px-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 ...
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!!