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i.MX RT1050 Crossover MCU with Arm® Cortex®-M7 core

For more details about the board visit the NXP board website. Details about the chip can be found here.

Flashing the kernel

Prerequisites:

  • NXP MCUXpresso SDK software

    The crt_emu_cm_redlink binary for flashing the board is not added to the PATH in a standard MCUXpresso installation. Due to the version- and OS-dependent paths, this has to be done manually. It will be located in paths such as

    • on macOS: /Applications/MCUXpressoIDE_11.1.1_3241/ide/plugins/com.nxp.mcuxpresso.tools.bin.macosx_11.1.0.202002241259/binaries/
    • on Debian-based Linux distributions: /usr/local/mcuxpressoide-11.1.1_3241/ide/plugins/com.nxp.mcuxpresso.tools.bin.linux_10.3.1.201811211038/binaries/

    Please add these directories to your path, like so:

    export PATH=$PATH:<the directory containing crt_emu_cm_redlink>`

  • for the flash-app target: gcc-arm-none-eabi

To compile Tock and flash the kernel onto the board, run make flash. Its output should look something like:

$ make flash
    Finished release [optimized + debuginfo] target(s) in 0.02s
   text	   data	    bss	    dec	    hex	filename
  82365	      0	  16384	  98749	  181bd	/home/USER/tock/target/thumbv7em-none-eabi/release/imxrt1050-evkb
crt_emu_cm_redlink \
	--flash-load-exec "/home/USER/tock/target/thumbv7em-none-eabi/release/imxrt1050-evkb.elf" \
	-p MIMXRT1052xxxxB --ConnectScript RT1050_connect.scp \
	--flash-driver= -x . --flash-dir /Flash --flash-hashing
Ns: MCUXpresso IDE RedlinkMulti Driver v11.3 (Mar 30 2021 17:55:57 - crt_emu_cm_redlink build 18)
Wc(03). No cache support.
Nc: Found chip XML file in ./MIMXRT1052xxxxB.xml
Nc: Restarted LinkServer process (PID 22344).

Running an app

Apps are built out-of-tree. Once an app is built, you can use arm-none-eabi-objcopy with --update-section to create an ELF image with your app(s) included.

$ arm-none-eabi-objcopy  \
    --update-section .apps=../../../libtock-c/examples/c_hello/build/cortex-m7/cortex-m7.tbf \
    target/thumbv7em-none-eabi/debug/imxrt1050-evkb.elf \
    target/thumbv7em-none-eabi/debug/imxrt1050-evkb-app.axf

Conveniently, the Makefile also offers a target which will integrate the tbf app bundle into the ELF image prior to flashing it to the board:

$ make flash-app APP=../../../libtock-c/examples/c_hello/build/cortex-m7/cortex-m7.tbf

Advanced debugging

If you want to run a program step by step, set breakpoints or other advanced debugging features, you can follow the steps below:

First step: Import a Hello World example project from the SDK and build the project. This way you will have the following file hierarchy in the Project Explorer Tab:

image info

Second step: Copy the app image from target/thumbv7em-none-eabi/debug/imxrt1050-evkb-app.axf to the Debug folder in MCU Expresso (via drag and drop):

image info

Next, flash the example program once in order to generate the LinkServer Debug file, like this:

image info

Next step, modify the LinkServer Debug, like this:

  • From Search Project, select the imxrt1050-evkb-app.axf file you copied earlier
  • Check the "Disable auto build" option
  • Press Apply and Continue

image info

Finally, press debug to run the code on the board and enjoy!