Hardware requirements

  • Type-C USB cable

  • FRDM-MCXW23 Board

  • Personal Computer

Board settings

MASTER_BOARD(I2C1)    CONNECTS TO      SLAVE_BOARD(I2C2)
Pin Name   Board Location     Pin Name   Board Location
I2C_SCL    J2-1               I2C_SCL    J2-6
I2C_SDA    J2-2               I2C_SDA    J2-7

Prepare the Demo

  1. Connect a USB cable between the host PC and the FRDM board J10.

  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.

==FreeRTOS I2C example start.==
This example use one i2c instance as master and another as slave on one board.
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  

I2C slave transfer completed successfully. 

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  

This time , slave will send data: :
0xff  0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  
0xf7  0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  
0xef  0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  
0xe7  0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  

Master received data :
0xff  0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  
0xf7  0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  
0xef  0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  
0xe7  0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  


End of FreeRTOS I2C example.