MIMXRT685-AUD-EVK

Overview

The i.MX RT600 is a crossover MCU family optimized for 32-bit immersive audio playback and voice user interface applications combining a high-performance Cadence Tensilica HiFi 4 audio DSP core with a next-generation Cortex-M33 core. The i.MX RT600 family of crossover MCUs is designed to unlock the potential of voice-assisted end nodes with a secure, power-optimized embedded processor.

The MIMXRT685-AUD-EVK board is an audio-focused evaluation kit for the i.MX RT685 crossover MCU, featuring a CS42448 audio codec and multiple audio interfaces.

Hardware

  • MIMXRT685SFVKB Cortex-M33 (300 MHz, 4.5 MB on-chip SRAM) core processor with Cadence Xtensa HiFi4 DSP

  • Onboard, high-speed USB, Link2 debug probe with CMSIS-DAP protocol (supporting Cortex M33 debug only)

  • High speed USB port with micro A/B connector for the host or device functionality

  • UART, I2C and SPI port bridging from i.MX RT685 target to USB via the on-board debug probe

  • 64 MB Macronix Quad SPI Flash operating at 1.8 V

  • NXP PCA9420UK PMIC

  • User LEDs

  • Reset and User buttons

  • CS42448 audio codec

For more information about the MIMXRT685 SoC and MIMXRT685-AUD-EVK board, see these references:

Supported Features

The mimxrt685_aud_evk board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

The MIMXRT685 SoC has IOCON registers, which can be used to configure the functionality of a pin.

Name

Function

Usage

PIO0_2

USART

USART RX

PIO0_1

USART

USART TX

PIO0_14

GPIO

GREEN LED

PIO0_26

GPIO

BLUE LED

PIO0_31

GPIO

RED LED

PIO1_1

GPIO

SW1

PIO0_10

GPIO

SW2

System Clock

The MIMXRT685-AUD-EVK is configured to use the OS Event timer as a source for the system clock.

Serial Port

The MIMXRT685 SoC has 8 FLEXCOMM interfaces for serial communication. One is configured as USART for the console and the remaining are not used.

Programming and Debugging

The mimxrt685_aud_evk board supports the runners and associated west commands listed below.

flash debug

Build and flash applications as usual (see Building an Application and Run an Application for more details).

Configuring a Debug Probe

A debug probe is used for both flashing and debugging the board. This board is configured by default to use the LPC-Link2.

  1. Install the LinkServer Debug Host Tools and make sure they are in your search path. LinkServer works with the default CMSIS-DAP firmware included in the on-board debugger.

linkserver is the default runner for this board

west flash
west debug

Configuring a Console

Connect a USB cable from your PC to the debug USB port, and use the serial terminal of your choice (minicom, putty, etc.) with the following settings:

  • Speed: 115200

  • Data: 8 bits

  • Parity: None

  • Stop bits: 1

Flashing

Here is an example for the Hello World application. This example uses the LinkServer Debug Host Tools as default.

# From the root of the zephyr repository
west build -b mimxrt685_aud_evk/mimxrt685s/cm33 samples/hello_world
west flash

Open a serial terminal, reset the board (press the RESET button), and you should see the following message in the terminal:

***** Booting Zephyr OS v4.x.x *****
Hello World! mimxrt685_aud_evk/mimxrt685s/cm33

Debugging

Here is an example for the Hello World application. This example uses the LinkServer Debug Host Tools as default.

# From the root of the zephyr repository
west build -b mimxrt685_aud_evk/mimxrt685s/cm33 samples/hello_world
west debug

Open a serial terminal, step through the application in your debugger, and you should see the following message in the terminal:

***** Booting Zephyr OS v4.x.x *****
Hello World! mimxrt685_aud_evk/mimxrt685s/cm33

Support Resources for Zephyr