mbox API AMP sample

Overview

This sample demonstrates the use of the DSP domains on supported NXP i.MX RTxxx platforms in an asymmetric multiprocessing (AMP) scenario. It’s a sample with separate projects for Cortex-M and DSP domains, that are built together into a single resulting image using Sysbuild. The Cortex-M domain is responsible for setting up the DSP domain (clock and power setup, code load and start) and sending a simple message using the mbox API (which maps to the MU peripheral on the devices covered). The DSP domain is programmed to print a “hello world” message to the chosen console UART and to receive the sent message, printing it out as it is received.

Building and Running

This sample can be built and started on supported boards as follows:

west build -b <board> -o --sysbuild samples/boards/nxp/adsp/rtxxx/amp_mbox
west flash -r jlink

Currently, these boards are supported: - mimxrt685_evk/mimxrt685s/cm33

The use of J-Link firmware on integrated debug probes of those boards or a standalone J-Link probe is desired as the J-Link probes have the ability to directly debug the Xtensa-based DSP cores.

Sample output

*** Booting Zephyr OS build v4.1.0-1858-g6bd0a62b0bde ***
Hello World! mimxrt685_evk/mimxrt685s/cm33
[ARM] Starting DSP...
*** Booting Zephyr OS build v4.1.0-1858-g6bd0a62b0bde ***
[DSP] Hello World! mimxrt685_evk/mimxrt685s/hifi4
[DSP] Button pressed!