B-G474E-DPOW1 Discovery

Overview

The B-G474E-DPOW1 Discovery kit is a digital power solution and a complete demonstration and development platform for the STMicroelectronics STM32G474RET6 microcontroller. Leveraging the new HRTimer-oriented features, 96 Kbytes of embedded RAM, math accelerator functions and USB-PD 3.0 offered by STM32G474RET6, the B-G474E-DPOW1 Discovery kit, based on the USB 2.0 FS Type-C™ connector interface, helps the user to prototype applications with digital power such as a buck-boost converter, RGB power LED lighting or a class-D audio amplifier. The B-G474E-DPOW1 Discovery kit does not require any separate probe, as it integrates the STLINK-V3E debugger and programmer.

  • STM32G474RET6 Arm® Cortex®-M4 core-based microcontroller, featuring 512 Kbytes of Flash memory and 128 Kbytes of SRAM, in LQFP64 package

  • USB Type-C™ with USB 2.0 FS interface compatible with USB-PD 3.0

  • RGB power LED for a bright lighting

  • Digital power buck-boost converter with internal or external Input voltage and with onboard resistor loads

  • Audio Class-D amplifier capable

  • 4 user LEDs

  • 3 LEDs for power and ST-LINK communication

  • 4-direction joystick with a selection button

  • Reset push-button

  • Board connectors:

    • USB Type-C™

    • USB Micro-B

    • 2 x 32-pin header, 2.54 mm pitch, daughterboard extension connector for breadboard connection

  • Flexible power-supply options: ST-LINK USB VBUS or USB Type-C™ VBUS or external source

  • On-board STLINK-V3E debugger/programmer with USB re-enumeration capability: mass storage, Virtual COM port, and debug port

More information about the board can be found at the B-G474E-DPOW1 website [1].

More information about STM32G474RE can be found here:

Supported Features

The Zephyr b_g474e_dpow1 board configuration supports the following hardware features:

Interface

Controller

Driver/Component

NVIC

on-chip

nested vector interrupt controller

UART

on-chip

serial port-polling; serial port-interrupt

GPIO

on-chip

gpio

USB

on-chip

usb

UCPD

on-chip

ucpd

WATCHDOG

on-chip

independent watchdog

Other hardware features are not yet supported in this Zephyr port.

The default configuration can be found in the defconfig file: boards/st/b_g474e_dpow1/b_g474e_dpow1_defconfig

Connections and IOs

Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as input (with or without pull-up or pull-down), or as peripheral alternate function. Most of the GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current capable except for analog inputs.

Default Zephyr Peripheral Mapping:

  • UART_3 TX/RX : PC10/PC11 (ST-Link Virtual Port Com)

  • BUTTON (JOY_SEL) : PC13

  • BUTTON (JOY_LEFT) : PC4

  • BUTTON (JOY_DOWN) : PC5

  • BUTTON (JOY_RIGHT) : PB2

  • BUTTON (JOY_UP) : PB10

  • LED (DOWN BLUE) : PA15

  • LED (LEFT ORANGE) : PB1

  • LED (UP RED) : PB5

  • LED (RIGHT GREEN) : PB7

  • USB DM : PA11

  • USB DP : PA12

  • UCPD CC2 : PB4

  • UCPD CC1 : PB6

For more details please refer to B-G474E-DPOW1 Discovery board User Manual [3].

Programming and Debugging

The B-G474E-DPOW1 Discovery board includes an ST-LINK/V3E embedded debug tool interface.

Applications for the b_g474e_dpow1 board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

The board is configured to be flashed using west STM32CubeProgrammer [5] runner, so its installation is required.

$ west flash

Flashing an application to the B_G474E_DPOW1

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b b_g474e_dpow1 samples/basic/blinky
west flash

You will see the LED blinking every second.

Debugging

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b b_g474e_dpow1 samples/hello_world
west debug

References