Blinky 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), the DSP domain is programmed to write a “hello world” message to the board’s chosen console UART and blink an LED. By pressing an associated button, the blinking can be turned off, demonstrating interrupt servicing and GPIO callbacks on the DSP domain.

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_blinky
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
[CM33] Starting HiFi4 DSP...
*** Booting Zephyr OS build v4.1.0-1858-g6bd0a62b0bde ***
[DSP] Hello World! mimxrt685_evk/mimxrt685s/hifi4
[DSP] Button pressed!