Hardware requirements

  • Micro USB cable

  • MIMXRT685-AUD-EVK board

  • Personal Computer

Board settings

No special settings are required.

Prepare the Demo

  1. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Launch the debugger in your IDE to begin running the demo.

Running the demo

The log below shows example output of the frequency measure demo in the terminal window:

Capture source: External clock (clk_in) (main system clock reference), reference frequency = 250105263 Hz
Computed frequency value = 23999301 Hz
Expected frequency value = 24000000 Hz

Capture source: RTC32K oscillator (main clock reference), reference frequency = 250105263 Hz
Computed frequency value = 5001265 Hz
Expected frequency value = 5002105 Hz

Capture source: FRO oscillator (main clock reference), reference frequency = 48000000 Hz
Computed frequency value = 52240185 Hz
Expected frequency value = 48000000 Hz