Hardware requirements

  • Mini/micro USB cable

  • FRDM-K32L3A6 board

  • Personal Computer

Board settings

No special settings are required. If download M0+ core project, need to let MCU boot from M0+ core. By default, MCU will boot from M4 core, it can be configured to boot from M0+ core. To do so, bitfield BOOT_CORE in FTFE_FOPT register needs to be set to 0. The register needs to be set to 0xFFFFFFBF. Below, steps how to access (program, read, erase) the FOPT register using J-Link Commander are listed:

  1. Connect J12 on board to PC using USB cable.

  2. Connect J7 on board to PC using Jlink.

  3. Open Jlink Command, input follow instructions, please make sure FTFE_FOPT value are 0xFFFFFFFF before doing below steps, and new configuration will become active after power-on-reset: w1 0x40023007 0x43 // FCCOB0: CMD_PROGRAM_ONCE (IFR) w1 0x40023006 0x84 // FCCOB1: IFR Index of the FOPT w1 0x40023005 0x00 // FCCOB2: Not used w1 0x40023004 0x00 // FCCOB3: Not used w1 0x4002300B 0xFF // FCCOB4: Record byte 0 value –> FOPT (Bit31:Bit24) w1 0x4002300A 0xFF // FCCOB5: Record byte 1 value –> FOPT (Bit23:Bit16) w1 0x40023009 0xFF // FCCOB6: Record byte 2 value –> FOPT (Bit15:Bit8) w1 0x40023008 0xBF // FCCOB7: Record byte 3 value –> FOPT (Bit7:Bit0) w1 0x40023000 0x80 // Trigger operation

  4. More details can be found on webpage https://wiki.segger.com/K32W#Boot_ROM.

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port 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 log below shows the output of the hello world demo in the terminal window:

hello world.