.. zephyr:board:: max32655evkit

Overview

The MAX32655 evaluation kit (EV kit) provides a platform for evaluation capabilities of the MAX32655 microcontroller, which is an advanced system-on-chip (SoC). It features an Arm® Cortex®-M4F CPU for efficient computation of complex functions and algorithms, integrated power management (SIMO), and the newest generation Bluetooth® 5.0 Low Energy (Bluetooth LE), long-range radio for wearable and hearable device applications.

The Zephyr port is running on the MAX32655 MCU.

.. image:: img/max32655evkit_img1.jpg :align: center :alt: MAX32655 EVKIT Front

.. image:: img/max32655evkit_img2.jpg :align: center :alt: MAX32655 Back

Hardware

MAX32655 MCU:
- Ultra-Low-Power Wireless Microcontroller
  - Internal 100MHz Oscillator
  - Flexible Low-Power Modes with 7.3728MHz System Clock Option
  - 512KB Flash and 128KB SRAM (Optional ECC on One 32KB SRAM Bank)
  - 16KB Instruction Cache
- Bluetooth 5.2 LE Radio
  - Dedicated, Ultra-Low-Power, 32-Bit RISC-V Coprocessor to Offload Timing-Critical Bluetooth Processing
  - Fully Open-Source Bluetooth 5.2 Stack Available
  - Supports AoA, AoD, LE Audio, and Mesh
  - High-Throughput (2Mbps) Mode
  - Long-Range (125kbps and 500kbps) Modes
  - Rx Sensitivity: -97.5dBm; Tx Power: +4.5dBm
  - Single-Ended Antenna Connection (50Ω)
- Power Management Maximizes Battery Life
  - 2.0V to 3.6V Supply Voltage Range
  - Integrated SIMO Power Regulator
  - Dynamic Voltage Scaling (DVS)
  - 23.8μA/MHz Active Current at 3.0V
  - 4.4μA at 3.0V Retention Current for 32KB
  - Selectable SRAM Retention + RTC in Low-Power Modes
- Multiple Peripherals for System Control
  - Up to Two High-Speed SPI Master/Slave
  - Up to Three High-Speed I2C Master/Slave (3.4Mbps)
  - Up to Four UART, One I2S Master/Slave
  - Up to 8-Input, 10-Bit Sigma-Delta ADC 7.8ksps
  - Up to Four Micro-Power Comparators
  - Timers: Up to Two Four 32-Bit, Two LP, TwoWatchdog Timers
  - 1-Wire® Master
  - Up to Four Pulse Train (PWM) Engines
  - RTC with Wake-Up Timer
  - Up to 52 GPIOs
- Security and Integrity
  - Available Secure Boot
  - TRNG Seed Generator
  - AES 128/192/256 Hardware Acceleration Engine
External devices connected to the MAX32655 EVKIT:
- Color TFT Display
- Audio Stereo Codec Interface
- Digital Microphone
- A 128Mb QSPI flash

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

+-----------+---------------+-----------------------------------------------------------------------+ | Name | Signal | Usage | +===========+===============+=======================================================================+ | JP1 | VREGI | Connect/Disconnect VREGIO power | +-----------+---------------+-----------------------------------------------------------------------+ | JP2 | P0_24 | Enable/Disable LED1 | +-----------+---------------+-----------------------------------------------------------------------+ | JP3 | P0_25 | Enable/Disable LED2 | +-----------+---------------+-----------------------------------------------------------------------+ | JP4 | P2_6/ P2_7 | Connect/Disconnect the USB to serial UART to GPIO P2_6 (LPUART_RX) | +-----------+---------------+-----------------------------------------------------------------------+ | JP5 | P2_7/ P0_1 | Connect/Disconnect the USB to serial UART to GPIO P2_7 (LPUART_TX) | +-----------+---------------+-----------------------------------------------------------------------+ | JP6 | P0_2 | Connect/Disconnect the USB to serial UART to GPIO P0_2 (UART0_CTS) | +-----------+---------------+-----------------------------------------------------------------------+ | JP7 | P0_3 | Connect/Disconnect he USB to serial UART to GPIO P0_3 (UART0_RTS) | +-----------+---------------+-----------------------------------------------------------------------+ | JP8 | VREGI | Select VDDIO_EN power source (3V3 or coin cell) | +-----------+---------------+-----------------------------------------------------------------------+ | JP9 | VDDIOH_EN | Select VDDIOH_EN power source 3V3/VREGI | +-----------+---------------+-----------------------------------------------------------------------+ | JP10 | VDDIOH | Connect/Disconnect VDDIOH power | +-----------+---------------+-----------------------------------------------------------------------+ | JP11 | VDDIO_EN | Select VDDIO_EN power source 1V8/VREGO_A | +-----------+---------------+-----------------------------------------------------------------------+ | JP12 | VDDIO | Connect/Disconnect VDDIO power | +-----------+---------------+-----------------------------------------------------------------------+ | JP13 | VDDA_EN | Select VDDA_EN power source 1V8/VREGO_A | +-----------+---------------+-----------------------------------------------------------------------+ | JP14 | VDDA | Connect/Disconnect VDDA power | +-----------+---------------+-----------------------------------------------------------------------+ | JP15 | VCOREA_EN | Select VCOREA_EN power source 1V1/VREGO_C | +-----------+---------------+-----------------------------------------------------------------------+ | JP16 | VCOREA | Connect/Disconnect VCOREA power | +-----------+---------------+-----------------------------------------------------------------------+ | JP17 | VCOREB_EN | Select VCOREB_EN power source 1V1/VREGO_B | +-----------+---------------+-----------------------------------------------------------------------+ | JP18 | VCOREB | Connect/Disconnect VCOREB power | +-----------+---------------+-----------------------------------------------------------------------+ | JP19 | BLE_LDO | Connect/Disconnect BLE_LDO power | +-----------+---------------+-----------------------------------------------------------------------+ | JP20 | VREF | Select VREF power source VDDIO/VDDIOH | +-----------+---------------+-----------------------------------------------------------------------+ | JP21 | I2C0_PU | Select I2C0_PU power source VDDIO/VDDIOH | +-----------+---------------+-----------------------------------------------------------------------+ | JP22 | I2C1_PU | Select I2C1_PU power source VDDIO/VDDIOH | +-----------+---------------+-----------------------------------------------------------------------+ | JP23 | BOARD RESET | Connect/Disconnect RV JTAG NRESET from the BOARD RESET circuitry | +-----------+---------------+-----------------------------------------------------------------------+

Programming and Debugging

.. zephyr:board-supported-runners::

Flashing

The MAX32655 MCU can be flashed by connecting an external debug probe to the SWD port. SWD debug can be accessed through the Cortex 10-pin connector, JH3. Logic levels are fixed to VDDIO (1.8V).

Once the debug probe is connected to your host computer, then you can simply run the west flash command to write a firmware image into flash. To perform a full erase, pass the --erase option when executing west flash.

.. note::

This board uses OpenOCD as the default debug interface. You can also use a Segger J-Link with Segger's native tooling by overriding the runner, appending --runner jlink to your west command(s). The J-Link should be connected to the standard 2*5 pin debug connector (JW3) using an appropriate adapter board and cable.

Debugging

Please refer to the Flashing_ section and run the west debug command instead of west flash.

Dual Core Support

An experimental board ID for the secondary RISC-V core is available with ID max32655evkit/max32655/m4.

The primary Arm core uses Kconfig options, :kconfig:option:CONFIG_MAX32_SECONDARY_RV32 to enable the secondary RISC-V core. The devicetree chosen property zephyr,code-rv32-partition, is used to determine the address for the RV32 core to start executing.

:zephyr:code-sample:sysbuild_hello_world supports building the Arm and RISC-V images:

.. zephyr-app-commands:: :zephyr-app: samples/sysbuild/hello_world :board: max32655evkit/max32655/m4 :west-args: -T sample.sysbuild.hello_world :goals: build :compact:

Currently, flashing both images requires using the JLink runner with a connected JLink device:

.. zephyr-app-commands:: :zephyr-app: samples/sysbuild/hello_world :board: max32655evkit/max32655/m4 :flash-args: -r jlink :goals: flash :compact:

To view the console for the RV32 core using the USB connection on the kit, move jumpers JP4 and JP5 to their "LP" positions.

References

MAX32655EVKIT web page_
zero-riscy user manual_

.. _MAX32655EVKIT web page: https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/max32655evkit.html#eb-overview

.. _zero-riscy user manual: https://pulp-platform.org/docs/user_manual.pdf