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board provides a thin board support package for imxrt-hal. The package provides cross-board compatibility for all imxrt-hal hardware examples. It supports imxrt-hal development and testing, and is not intended as a general BSP.

board supports

  • Teensy 4.0 and Teensy 4.1 boards with the teensy4 feature.
  • the IMXRT1010EVK board with the imxrt1010evk feature.
  • the IMXRT1060EVK board with the imxrt1060evk feature.
  • the Cortex M7 on the IMXRT1170EVK board with the imxrt1170evk-cm7 feature.

A board may only support a subset of all examples. To understand which examples are supported by your board, consult the CI testing matrix.

Board configurations

Each board configures its supported hardware based on its pinout. To understand your board's configuration, see the relevant module in src/. You'll want this information to understand which pins are configured as LPUART TX and RX pins, which pin is the LED, etc.

Boards may share configurations, like baud rates and timer resolutions. Consult a board module to understand if it's sharing these configurations.

board plays tricks so that a single RTIC application can compile and run across all supported boards. This means that the RTIC examples are coupled to the board package, and interrupts like BOARD_CONSOLE may look peculiar. Make sure you're familiar with RTIC before deeply studying these examples.

Building hardware examples

Hardware examples for imxrt-hal depend on board and a board selection. This section describes how to build an example for your board. It focuses on building examples for the Teensy 4, but the concept generalizes for all supported boards.

To build the hal_led example for a Teensy 4, run the command from the repo's root:

cargo build --example=hal_led --features=board/teensy4 --target=thumbv7em-none-eabihf

Generally, you select the example with --example, and specify the board with --features=board/[your-board]. To build the same example for the IMXRT1010EVK, change --features=board/teensy4 to --features=board/imxrt1010evk.

To build most of the hardware examples for the Teensy 4, run

cargo build --examples --features=board/teensy4 --target=thumbv7em-none-eabihf

As before, change the board feature to select a different board.

Some examples require additional board features. To understand those extra board features, see the top-level Cargo.toml and the required features of each example. For instance, examples with SPI may require an additional feature. To build the SPI example for the Teensy 4, run

cargo build --example=rtic_spi --features=board/teensy4,board/spi --target=thumbv7em-none-eabihf

Note that enabling board/spi for other examples may not be supported. So, you should only include extra board features when building specific examples, as required.

Depending on the target, some debug builds may fail to link due to large data or text regions. Try building these examples with --release to enable size optimizations.

Artifacts are available under target/thumbv7em-none-eabihf/[debug|release]/examples. Keep this in mind when flashing your board.

Flashing hardware examples

The tools required to flash an example depend on the board you're using. This section recommends tooling to flash hardware examples on your board.

NXP IMXRT EVKs

If you're using an NXP IMXRT EVK, you can use either the on-board CMSIS debug access probe (DAP), or an external JTAG / SWD tool. For recommended software support, see the flashing and debugging tool recommendations in the imxrt-rs book.

Teensy 4

If you're using a Teensy 4 board, you'll need all of the following:

  • An objcopy capable of transforming ELF files into Intel HEX. Consider using rust-objcopy provided by cargo-binutils. The rest of this documentation assumes you're using cargo-binutils.
  • Either a build of teensy_loader_cli, or the Teensy Loader Application. The latter is available with the Teensyduino add-ons.

After building your example, use rust-objcopy to convert the program into HEX. For the hal_led example above, that command resembles

rust-objcopy -O ihex target/thumbv7em-none-eabihf/debug/examples/hal_led hal_led.hex

Finally, load the HEX file onto your board using your preferred loader.

Tips and tricks

  • Use the --target-dir option of cargo build to select output directories on a board-by-board basis. This is useful to automatically track artifacts for different boards.
  • If you're using probe-run or pyOCD to flash an EVK, use the tool as a runner. See the Cargo Configuration documentation for more information. Please do not check your runner setting into the repository; consider using environment variables or hierarchical configuration files to configure your runner and any other useful command aliases.

Adding a new board

See the hardware testing section of the CONTRIBUTING guide.