Hardware requirements

• Mini/micro USB cable

• FRDM-K22F board

• Personal Computer

Board settings

connect input signal to J1-14

Prepare the Demo

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

2. Open a serial terminal with these settings:

   • 115200 baud rate

   • 8 data bits

   • No parity

   • One stop bit

   • No flow control

3. Download the program to the target board.

4. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.

Running the demo

These instructions are displayed/shown on the terminal window:

FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed

Capture value C(n)V=3

Capture value C(n+1)V=5a8

Input signals pulse width=24 us