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!!