Hardware requirements

  • Type-C USB cable

  • FRDM-MCXL255 board

  • Personal Computer

Board settings

MASTER_BOARD        CONNECTS TO         SLAVE_BOARD
Pin Name     Board Location     Pin Name     Board Location
LPI2C0_SCL   J5-5               LPI2C0_SCL   J5-5
LPI2C0_SDA   J5-6               LPI2C0_SDA   J5-6
GND          J5-8               GND          J5-8

AON:

MASTER_BOARD        CONNECTS TO         SLAVE_BOARD
Pin Name     Board Location     Pin Name     Board Location
AON__I2C0_SCL   J2-9            AON__I2C0_SCL    J2-9
AON__I2C0_SDA   J2-7            AON__I2C0_SDA    J2-7
GND             J2-14           GND              J2-14

Make sure you have solder bridges SJ1 and SJ2 set to

  • 2-1 for the main core (cm33)

  • 2-3 for AON core (cm0+)

Prepare the Demo

Note: MCUXpresso IDE project default debug console is semihost

  1. Connect a Type-C USB cable between the host PC and the MCU-Link port(J16) on the target 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. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

The following message shows in the terminal if the example runs successfully.

LPI2C board2board polling example -- Master transfer.
Master will send data :
0x 0  0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7
0x 8  0x 9  0x a  0x b  0x c  0x d  0x e  0x f
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f

Receive sent data from slave :
0x 0  0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7
0x 8  0x 9  0x a  0x b  0x c  0x d  0x e  0x f
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f


End of LPI2C example .