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!!