MCUXpresso SDK Documentation
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Hardware requirements

Hardware requirements#

  • Type-C USB cable

  • FRDM-MCXL255 board

  • Personal Computer

Board settings#

LPI2C:

CM33

            MASTEE(I2C0)    connect to  SLAVE(I2C0)
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

CM0PLUS:

MASTER(AON__I2C0)   connect to      SLAVE(AON__I2C0)
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#

  1. Connect a USB Type-C cable between the host PC and the MCU-Link USB 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 lines are printed to the serial terminal when the demo program is executed.

LPI2C board2board polling example -- Slave transfer.

Slave received 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


End of LPI2C example .
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