Hardware requirements

  • Mini/micro USB cable

  • FRDM-K22F board

  • Personal Computer

Board settings

No special is needed.

Prepare the Demo

  1. Connect a mini USB cable between the PC host and the OpenSDA USB port on the board.

  2. Connect the analog signal source’s output to the input of used-defined comparator’s channel (defined as “DEMO_CMP_USER_CHANNEL” in source code.)

  3. Open a serial terminal on PC for OpenSDA serial device with these settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  4. Download the program to the target board.

  5. Reset the SoC and run the project.

Running the demo

When the demo runs successfully, the log would be seen on the OpenSDA terminal like:

CMP interrupt Example

Then change CMP analog input, and watch the change of LED. - CMP0_IN0 (Jump J1-16) connected to VCC=3.3V(Jump J25-4): LED GREEN on - CMP0_IN0 (Jump J1-16) connected to GND(Jump J2-14): LED GREEN off