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.

`mimxrt685_aud_evk/mimxrt685s/cm33` target

On-target memory for this board target: 3 MiB of RAM, 64 MiB of Flash.

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33F CPU1	`arm,cortex-m33f`
ADC	on-chip	LPC LPADC1	`nxp,lpc-lpadc`
ARM architecture	on-chip	LPC Flexcomm node7	`nxp,lpc-flexcomm`
Audio	on-chip	NXP DMIC1	`nxp,dmic`
Clock control	on-chip	LPC SYSCON & CLKCTL IP node2	`nxp,lpc-syscon`
Comparator	on-chip	NXP Kinetis ACMP (Analog CoMParator)1	`nxp,kinetis-acmp`
Counter	on-chip	Driver that uses the NXP LPC RTC High resolution counter1	`nxp,lpc-rtc-highres`
	on-chip	NXP MCUX Standard Timer/Counter5	`nxp,lpc-ctimer`
	on-chip	NXP Multirate Timer1	`nxp,mrt`
	on-chip	NXP Multirate Timer Channel4	`nxp,mrt-channel`
CRC	on-chip	NXP LPC CRC device1	`nxp,lpc-crc`
DMA	on-chip	NXP LPC DMA controller2	`nxp,lpc-dma`
GPIO & Headers	on-chip	LPC GPIO1	`nxp,lpc-gpio`
GPIO & Headers	on-chip	LPC GPIO port device6	`nxp,lpc-gpio-port`
Hardware information	on-chip	NXP LPC 128-bit Unique identifier1	`nxp,lpc-uid`
I2C	on-chip	LPC I2C1	`nxp,lpc-i2c`
I3C	on-chip	NXP MCUX I3C controller1	`nxp,mcux-i3c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	NXP Pin interrupt and pattern match engine (PINT)1	`nxp,pint`
Interrupt controller	on-chip	ARMv8-M NVIC (Nested Vectored Interrupt Controller)1	`arm,v8m-nvic`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
Mailbox	on-chip	NXP i.MX Message Unit as Zephyr MBOX1	`nxp,mbox-imx-mu`
Miscellaneous	on-chip	NXP i.MX RTxxx DSP control driver (i.MX RT600 HiFi 4 DSP)1	`nxp,rt600-dsp-ctrl`
MMU / MPU	on-chip	ARMv8-M MPU (Memory Protection Unit)1	`arm,armv8m-mpu`
MTD	on-board	NXP FlexSPI NOR1	`nxp,imx-flexspi-nor`
MTD	on-board	Flash node1	`soc-nv-flash`
Pin control	on-chip	LPC I/O Pin Configuration (IOCON)1	`nxp,lpc-iocon`
Pin control	on-chip	RT600/RT500 Pin Controller1	`nxp,rt-iocon-pinctrl`
PWM	on-chip	NXP SCTimer PWM1	`nxp,sctimer-pwm`
Reset controller	on-chip	NXP RSTCTL Peripheral reset controller2	`nxp,rstctl`
RNG	on-chip	Kinetis TRNG (True Random Number Generator)1	`nxp,kinetis-trng`
RTC	on-chip	NXP LPC RTC1	`nxp,lpc-rtc`
SDHC	on-chip	NXP imx USDHC controller2	`nxp,imx-usdhc`
Serial controller	on-chip	LPC USART1	`nxp,lpc-usart`
SPI	on-chip	NXP FlexSPI controller1	`nxp,imx-flexspi`
SPI	on-chip	NXP LPC SPI controller1	`nxp,lpc-spi`
SRAM	on-chip	Generic on-chip SRAM2	`mmio-sram`
Timer	on-chip	NXP OS Timer on i.MX-RT5xx/6xx1	`nxp,os-timer`
Timer	on-chip	ARMv8-M System Tick1	`arm,armv8m-systick`
USB	on-chip	NXP LPCIP3511 USB device mode1	`nxp,lpcip3511`
USB	on-chip	NXP USB High Speed PHY1	`nxp,usbphy`
Watchdog	on-chip	LPC Windowed Watchdog Timer2	`nxp,lpc-wwdt`

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	attach	debugserver	reset	rtt
jlink	✅	✅	✅	✅	✅	✅
linkserver	✅ (default)	✅ (default)	✅	✅

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.

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

Install the J-Link Debug Host Tools and make sure they are in your search path.

west flash -r jlink
west debug -r jlink

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