ST B_U585I_IOT02A Discovery kit¶
Overview¶
The B_U585I_IOT02A Discovery kit features an ARM Cortex-M33 based STM32U585AI MCU with a wide range of connectivity support and configurations. Here are some highlights of the B_U585I_IOT02A Discovery kit:
STM32U585AII6Q microcontroller featuring 2 Mbyte of Flash memory, 786 Kbytes of RAM in UFBGA169 package
512-Mbit octal-SPI Flash memory, 64-Mbit octal-SPI PSRAM, 256-Kbit I2C EEPROM
USB FS, Sink and Source power, 2.5 W power capability
802.11 b/g/n compliant Wi-Fi® module from MXCHIP
Bluetooth Low Energy from STMicroelectronics
MEMS sensors from STMicroelectronics
2 digital microphones
Relative humidity and temperature sensor
3-axis magnetometer
3D accelerometer and 3D gyroscope
Pressure sensor, 260-1260 hPa absolute digital output barometer
Time-of-flight and gesture-detection sensor
Ambient-light sensor
2 push-buttons (user and reset)
2 user LEDs
- Flexible power supply options:
ST-LINK/V3
USB Vbus
External sources
More information about the board can be found at the B U585I IOT02A Discovery kit website.
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
2 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™
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:
Supported Features¶
The Zephyr b_u585i_iot02a 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 |
PINMUX |
on-chip |
pinmux |
GPIO |
on-chip |
gpio |
The default configuration can be found in the defconfig file:
boards/arm/b_u585i_iot02a/b_u585i_iot02a_defconfig
Connections and IOs¶
B_U585I_IOT02A Discovery kit has 9 GPIO controllers (from A to I). These controllers are responsible for pin muxing, input/output, pull-up, etc.
For mode details please refer to B U585I IOT02A board User Manual.
Default Zephyr Peripheral Mapping:¶
UART_1 TX/RX : PA9/PA10 (ST-Link Virtual Port Com)
LD1 : PH7
LD2 : PH6
user button : PC13
System Clock¶
B_U585I_IOT02A Discovery System Clock could be driven by an internal or external oscillator, as well as the main PLL clock. By default the System clock is driven by the PLL clock at 80MHz, driven by 16MHz high speed internal oscillator.
Serial Port¶
B_U585I_IOT02A Discovery kit has 4 U(S)ARTs. The Zephyr console output is assigned to UART1. Default settings are 115200 8N1.
Programming and Debugging¶
Flashing¶
B_U585I_IOT02A Discovery kit includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in Zephyr SDK.
Flashing an application to B_U585I_IOT02A Discovery kit¶
Connect the B_U585I_IOT02A Discovery kit to your host computer using the USB port, then run a serial host program to connect with your Discovery board. For example:
$ minicom -D /dev/ttyACM0
Then, build and flash in the usual way. Here is an example for the Hello World application.
# From the root of the zephyr repository
west build -b b_u585i_iot02a samples/hello_world
west flash
You should see the following message on the console:
Hello World! arm
Debugging¶
Debugging¶
STM32U5 support is not currently supported in openocd. As a temporary workaround, user can use STMicroelectronics customized version of OpenOCD to debug the the B_U585I_IOT02A Discovery kit. For this you need to fetch this repo and build openocd following the instructions provided in the README of the project. Then, build zephyr project indicating the openocd location in west build command.
Here is an example for the Blinky application.
# From the root of the zephyr repository
west build -b b_u585i_iot02a samples/basic/blinky -- -DOPENOCD="<path_to_openocd>/openocd/src/openocd" -DOPENOCD_DEFAULT_PATH="<path_to_openocd>/openocd/tcl/"
Then, indicate openocd as the chosen runner in flash and debug commands:
# From the root of the zephyr repository
west build -b b_u585i_iot02a samples/basic/blinky -- -r openocd
west flash
# From the root of the zephyr repository
west build -b nucleo_u575zi_q samples/basic/blinky -- -r openocd
west debug