DHSBC STM32MP2x

The DHSBC STM32MP25 board is the official DHCOS STM32MP25x reference design!

Introduction

Reference design for secure industrial IoT devices based on STM32MP25

• Single Board Computer based on solderable, pin-compatible DHCOS STM32MP25 SOM
• Industrial grade, 10+ years available
• Mainline Linux support (also for Vivante GPU)
• Security Features e.g. Secure Boot / Storage
• Connectivity: Gbit Ethernet, WiFi/BT
• Multimedia: 3D GPU, display, video, camera
• STPMIC25 supports low power modes

Technical Details

STM32MP255C 2x ARM Cortex-A35 with 1.2 GHz 1x ARM Cortex-M33 up to 400 MHz PMIC STPMIC25D LPDDR4 32-bit 4 Gbyte @ 1200 MHz eMMC Flash 16 Gbyte NOR Flash 4 Mbyte, Quad SPI interface EEPROM 4 kbyte microSD socket RTC temp. compensated RV-3032-C7 USB Host 1x type A, 2.0 high-speed USB Type-C 1x USB-C 3.2 Gen 1x1 with DisplayPort alt. mode support WiFi / Bluetooth Tri band 2.4 GHz, 5 GHz and 6 GHz for IEEE802.11a/b/g/n/ac/ax Bluetooth® v5.4 BR/EDR/LE Antenna: U-FL connector Ethernet 2x 10 / 100 / 1000 Mbit/s, IEEE 802.3-compliant

LVDS 1x Dual Link, 2x 4-lane LVDS connector MIPI-CSI2 1x 2-lanes connector TPM (Trusted Platform Module)2.0 device ST33KTPM2I Push-Buttons Power and reset Battery Socket CR1216, CR1220 and CR1225 Boot Mode 4 bit boot mode switch Debug Interface JTAG interface via tag-connect Supply 5 VDC, USB Type-C power supply port Dimensions 85 x 56 mm Raspberry Pi 40-pin Expansion 2 x UART 1 x I2C 1 x I2S 1 x SPI 2 x PWM 2 x CAN up to 28 x GPIOs

IMPORTANT INFORMATIONS

• The DHSBC DisplayPort functionality has not yet been implemented at this time. The test image is a headless image. If you want to connect a display, please contact DH electronics. We can offer a 10" LVDS test kit, or you can connect your own LVDS display and we will assist with implementation.

Documentation

• Getting-Started with DHSBC STM32MP25
• DHCOS STM32MP2x User Manual IMPORTANT: Please have a look at chapter 27. Hardware design checklist

Design Files

• DHSBC STM32MP25 Schematic
• DHCOS STM32MP2x 3D STEP file
• DHSBC STM32MP2 3D STEP file

Software

• Build your own Yocto LTS via kas (GitHub)

Note: Please use dh-stm32mp25-dhcos-dhsbc.yml configuration.

• Yocto BSP meta layer (Github)

Note: Currently, for the DHCOS STM32MP2, we use the 'meta-dhsom-stm32-wip-bsp' (work in progress) layer. The STM32MP2 will later be integrated into the meta-dhsom-stm32-bsp layer.

Useful instructions

Setup new board and install image files via USB (dfu and ums mode) / U-Boot recovery via DFU

• DHSBC STM32MP2 DFU and UMS usage

How to connect to WiFi network

Establish connection

$ wpa_passphrase "SSID" > /etc/wpa_supplicant.conf

-> In the next step, please enter the password

$ rfkill unblock all

$ wpa_supplicant -B -i wlansom0 -c /etc/wpa_supplicant.conf

Disconnect

$ ip link set wlansom0 down

Use GPIOs

To list available GPIOs, use the gpioinfo command:

$ gpioinfo

       gpiochip0 - 16 lines:
       line   0:       "DHSBC_HW-CODE_0"       input consumer="kernel"
       line   1:       "DHSBC_HW-CODE_1"       input
       line   2:       "DHSBC_HW-CODE_2"       input
       line   3:       "PA3"                   input
       line   4:       "DHCOS-E"               input
       line   5:       "DHCOS-J"               input
       line   6:       "PA6"                   input
       line   7:       "PA7"                   input
       ...

To set a GPIO as Output-High:

$ gpioset "LABLE"=1

To set a GPIO as Output-Low:

$ gpioset "LABLE"=0

To get current state of a GPIO:

$ gpioget "LABLE"

Configure systemd network configuration

Find configuration files:

find /usr -name \*wlansom0\*

find /usr -name \*ethsom0\*

find /usr -name \*ethsom1\*

systemd network configuration:

• systemd-networkd documentation
• systemd.network — Network configuration

Links

• DH DHCOS STM32MP2x
• DH DHSBC STM32MP25
• STM32 MPU wiki
• STM32MP23 resources
• STM32MP25 resources