ST SensorTile.box PRO
Overview
The STEVAL-MKBOXPRO (SensorTile.box PRO) features an ARM Cortex-M33 based STM32U585AI MCU and is a ready-to-use box kit for wireless IoT and wearable sensor platforms to help using and developing apps based on remote motion and environmental sensor data.
The SensorTile.box PRO board fits into a small plastic box with a long-life rechargeable battery, and communicates with a standard smartphone through its Bluetooth interface, providing data coming from the sensors.
More information about the board can be found at the SensorTile.box PRO website [1].
Supported Features
The SensorTile.box PRO provides motion, environmental, and audio sensor data through either the BLE or USB protocols to a host application running on a smartphone/PC to implement applications such as:
Pedometer optimized for belt positioning
Baby crying detection with Cloud AI learning
Barometer / environmental monitoring
Vehicle / goods tracking
Vibration monitoring
Compass and inclinometer
Sensor data logger
(see Motion and environmental sensors section for the complete lists of available sensors on board)
Hardware
The STM32U585xx devices are an ultra-low-power microcontrollers family (STM32U5 Series) based on the high-performance Arm|reg| Cortex|reg|-M33 32-bit RISC core. They operate at a frequency of up to 160 MHz.
Ultra-low-power with FlexPowerControl (down to 300 nA Standby mode and 19.5 uA/MHz run mode)
Core: ARM® 32-bit Cortex® -M33 CPU with TrustZone® and FPU.
Performance benchmark:
1.5 DMPIS/MHz (Drystone 2.1)
651 CoreMark® (4.07 CoreMark® /MHZ)
Security and cryptography
Arm® TrustZone® and securable I/Os memories and peripherals
Flexible life cycle scheme with RDP (readout protection) and password protected debug
Root of trust thanks to unique boot entry and secure hide protection area (HDP)
Secure Firmware Installation thanks to embedded Root Secure Services
Secure data storage with hardware unique key (HUK)
Secure Firmware Update support with TF-M
2 AES coprocessors including one with DPA resistance
Public key accelerator, DPA resistant
On-the-fly decryption of Octo-SPI external memories
HASH hardware accelerator
Active tampers
True Random Number Generator NIST SP800-90B compliant
96-bit unique ID
512-byte One-Time Programmable for user data
Active tampers
Clock management:
4 to 50 MHz crystal oscillator
32 kHz crystal oscillator for RTC (LSE)
Internal 16 MHz factory-trimmed RC ( ±1%)
Internal low-power 32 kHz RC ( ±5%)
2 internal multispeed 100 kHz to 48 MHz oscillators, including one auto-trimmed by LSE (better than ±0.25 % accuracy)
3 PLLs for system clock, USB, audio, ADC
Internal 48 MHz with clock recovery
Power management
Embedded regulator (LDO)
Embedded SMPS step-down converter supporting switch on-the-fly and voltage scaling
RTC with HW calendar and calibration
Up to 136 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
Up to 17 timers and 2 watchdogs
2x 16-bit advanced motor-control
2x 32-bit and 5 x 16-bit general purpose
4x low-power 16-bit timers (available in Stop mode)
2x watchdogs
2x SysTick timer
ART accelerator
8-Kbyte instruction cache allowing 0-wait-state execution from Flash and external memories: up to 160 MHz, MPU, 240 DMIPS and DSP
4-Kbyte data cache for external memories
Memories
2-Mbyte Flash memory with ECC, 2 banks read-while-write, including 512 Kbytes with 100 kcycles
786-Kbyte SRAM with ECC OFF or 722-Kbyte SRAM including up to 322-Kbyte SRAM with ECC ON
External memory interface supporting SRAM, PSRAM, NOR, NAND and FRAM memories
2 Octo-SPI memory interfaces
Rich analog peripherals (independent supply)
14-bit ADC 2.5-Msps, resolution up to 16 bits with hardware oversampling
12-bit ADC 2.5-Msps, with hardware oversampling, autonomous in Stop 2 mode
12-bit DAC, low-power sample and hold
2 operational amplifiers with built-in PGA
2 ultra-low-power comparators
Up to 22 communication interfaces
USB Type-C / USB power delivery controller
USB OTG 2.0 full-speed controller
2x SAIs (serial audio interface)
4x I2C FM+(1 Mbit/s), SMBus/PMBus
6x USARTs (ISO 7816, LIN, IrDA, modem)
3x SPIs (5x SPIs with dual OCTOSPI in SPI mode)
1x FDCAN
2x SDMMC interface
16- and 4-channel DMA controllers, functional in Stop mode
1 multi-function digital filter (6 filters)+ 1 audio digital filter with sound-activity detection
CRC calculation unit
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
True Random Number Generator (RNG)
Graphic features
Chrom-ART Accelerator (DMA2D) for enhanced graphic content creation
1 digital camera interface
Mathematical co-processor
CORDIC for trigonometric functions acceleration
FMAC (filter mathematical accelerator)
More information about STM32U585AI can be found here:
Motion and environmental sensors
LSM6DSV16X 6-axis inertial measurement unit (lsm6dsv16x datasheet [4])
LIS2MDL 3-axis magnetometer (lis2mdl datasheet [5])
LPS22DF Altimeter / pressure sensor (lps22df datasheet [6])
LIS2DU12 3-axis accelerometer (lis2du12 datasheet [7])
HTS221 Humidity sensor (hts221 datasheet [8])
STTS22H Digital temperature sensor (stts22hh datasheet [9])
MP23db01HP Microphone / audio sensor (mp23db01hp datasheet [10])
Connections and IOs
4x user LEDs
led0 (Green)
led1 (Red - shared with BLE)
led2 (Yellow)
led3 (Blue)
4x buttons/switch
User BT1 button, available to user application
User BT2 / boot0 button, available to user application but useful to let the SensorTile.box PRO enter DFU mode if found pressed after h/w reset (see rst button and Programming and Debugging section)
rst button, used to reset the board (not available on case)
power switch, used to Power on/off the board
System Clock
SensorTile.box PRO System Clock could be driven by internal or external oscillator, as well as main PLL clock. By default, the System clock is driven by the PLL clock at 80MHz, driven by the 16MHz external oscillator. The system clock can be boosted to 120MHz. The internal AHB/APB1/APB2 AMBA buses are all clocked at 80MHz.
Serial Port
The SensorTile.box PRO has 4 U(S)ARTs. The UART4 is connected to JTAG/SWD connector and may be used as console.
USB interface
SensorTile.box PRO can be connected as a USB device to a PC host through its USB-C connector. The final application may use it to declare SensorTile.box PRO device as belonging to a certain standard or vendor class, e.g. a CDC, a mass storage or a composite device with both functions.
Console
There are two possible options for Zephyr console output:
through USB as USB CDC/ACM class. This is the default case present in the board dts file and is enabled by
CONFIG_BOARD_SERIAL_BACKEND_CDC_ACM
.
/ {
chosen {
zephyr,console = &cdc_acm_uart0;
};
};
&zephyr_udc0 {
cdc_acm_uart0: cdc_acm_uart0 {
compatible = "zephyr,cdc-acm-uart";
};
};
through UART4 which is available on SWD connector (JP2). In this case a JTAG adapter can be used to connect SensorTile.box PRO and have both SWD and console lines available.
To enable console and shell over UART:
in your prj.conf, override the board’s default configuration by setting
CONFIG_BOARD_SERIAL_BACKEND_CDC_ACM=n
add an overlay file named
<board>.overlay
:
/ {
chosen {
zephyr,console = &uart4;
zephyr,shell-uart = &uart4;
};
};
Console default settings are 115200 8N1.
Programming and Debugging
There are two alternative methods of flashing ST Sensortile.box Pro board:
Using DFU software tools
This method requires to enter STM32U585 ROM bootloader DFU mode by powering up (or reset) the board while keeping the BOOT0 button pressed. No additional hardware is required except a USB-C cable. This method is fully supported by Flash & Debug Host Tools. You can read more about how to enable and use the ROM bootloader by checking the application note AN2606 [11] (STM32U585xx section).
Using SWD hardware tools
This method requires to connect additional hardware, like a ST-LINK/V3 embedded debug tool, to the board SWD connector.
DFU flashing
Install dfu-util
It is recommended to use at least v0.9 of dfu-util. The package available in Debian and Ubuntu can be quite old, so you might have to build dfu-util from source. Information about how to get the source code and how to build it can be found at the DFU-UTIL website [12]
Flash an Application to SensorTile.box PRO
While pressing the BOOT0 button, connect the USB-C cable to the USB OTG SensorTile.box PRO port and to your computer. The board should be forced to enter DFU mode.
Check that the board is indeed in DFU mode:
$ sudo dfu-util -l
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2019 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
Found DFU: [0483:df11] ver=2200, devnum=74, cfg=1, intf=0, path="2-2", alt=2, name="@OTP Memory /0x1FFF7000/01*0001Ke", serial="204A325D574D"
Found DFU: [0483:df11] ver=2200, devnum=74, cfg=1, intf=0, path="2-2", alt=1, name="@Option Bytes /0x1FF00000/01*040 e/0x1FF01000/01*040 e", serial="204A325D574D"
Found DFU: [0483:df11] ver=2200, devnum=74, cfg=1, intf=0, path="2-2", alt=0, name="@Internal Flash /0x08000000/512*0004Kg", serial="204A325D574D"
You should see following confirmation on your Linux host:
$ dmesg
usb 2-2: new full-speed USB device number 74 using xhci_hcd
usb 2-2: New USB device found, idVendor=0483, idProduct=df11
usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-2: Product: STM32 BOOTLOADER
usb 2-2: Manufacturer: STMicroelectronics
usb 2-2: SerialNumber: 204A325D574D
You can build and flash the provided sample application (ST SensorTile.box Pro on-board sensors test) that reads sensors data and outputs values on the console.