The STM32MP15x series is the flagship of ST’s first-generation MPUs, famous for its Dual-Core architecture. Unlike the single-core MP13x, this series is designed for high-end industrial HMI, smart home hubs, and edge computing where you need 3D graphics and real-time control simultaneously.  

## 1. STM32MP15x Series Theory

The MP15x (specifically the MP157) is the most powerful in this family. Its architecture is built on three pillars:

The "Brain" (Application): Dual Arm® Cortex®-A7 cores (up to 800 MHz). This runs OpenSTLinux, handling the heavy lifting like WiFi stacks, complex GUIs, and database management.  

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The "Reflex" (Real-Time): An Arm® Cortex®-M4 core (209 MHz). This core acts like a built-in microcontroller (MCU). It handles motor control, low-latency sensors, and power management without needing the Linux side to wake up.  

The "Artist" (Graphics): A dedicated Vivante® 3D GPU supporting OpenGL® ES 2.0. This allows for smooth smartphone-like animations and 3D rendering that the MP13x cannot do.  

## 2. STM32MP157x-EV1 (Evaluation Board)

This is the "Everything and the Kitchen Sink" board. It is a large, professional development platform used when you want to test every single feature the chip offers.

Motherboard/Daughterboard Setup: It consists of a large baseboard (MB1262) and a smaller MPU daughterboard.

Display: Massive 5.5" 720p (720x1280) MIPI DSI display with a capacitive touchscreen.

Storage: Includes eMMC and NAND Flash on board, plus a microSD slot.  

Industrial I/O: Features CAN FD, specialized motor control connectors, SPDIF (Digital Audio), and a Smartcard reader.  

Camera: Includes a 5-megapixel 8-bit camera module.  

Best For: Engineering teams designing high-end industrial products who need to prototype complex hardware layouts and high-resolution screens.

## 3. STM32MP157x-DK2 (Discovery Kit 2)

The DK2 is the most popular board for individual developers and small teams. It is compact, affordable, and "breadboard-friendly."

Display: A smaller 4" WVGA (480x800) MIPI DSI display.  

Connectivity: Unlike the DK1, the DK2 adds Wi-Fi and Bluetooth Low Energy (BLE) modules directly on the board.  

Video Output: Includes an HDMI port, allowing you to plug it into a standard monitor.

Expansion: Features both Arduino Uno V3 and Raspberry Pi 40-pin headers. This allows you to use almost any existing shield or HAT.  

Power: Powered via USB Type-C.  

Best For: Prototyping "Smart Home" devices, portable gadgets, or learning how to bridge the gap between Linux and Real-Time M4 code.

## Key Comparison Table

FeatureSTM32MP157x-EV1 (Evaluation)STM32MP157x-DK2 (Discovery)

PriceHigh (Professional)Low (Developer friendly)

SizeLarge, desktop-styleCompact, handheld-style

Display5.5" HD (720p)4.0" (480x800)

NetworkingGigabit EthernetGigabit Ethernet + WiFi/BT

ExpansionMotor control, SmartcardArduino & Raspberry Pi headers

Graphics3D GPU Enabled3D GPU Enabled

  

Both boards use the same OpenSTLinux Distribution.

Starter Package: Flash a microSD card and see a desktop environment on the screen in minutes.

Developer Package: Use STM32CubeIDE to write code for the M4 core and STM32CubeMX to configure the pins and clock tree for the A7 cores.

HMI Theory: Because of the Vivante GPU, you can use high-end frameworks like Qt or TouchGFX to create very smooth, high-frame-rate user interfaces.