Nucleo L412RB-P

Overview

The Nucleo L412RB board features an ARM Cortex-M4 based STM32L412RB MCU with a wide range of connectivity support and configurations. Here are some highlights of the Nucleo L412RB board:

STM32 microcontroller in LQFP64 package
1 user LED shared with ARDUINO®
1 user and 1 reset push-buttons
32.768 kHz crystal oscillator
Two types of extension resources:
- Arduino Uno V3 connectivity
- ST morpho extension pin headers for full access to all STM32 I/Os
On-board ST-LINK debugger/programmer with USB re-enumeration capability: mass storage, Virtual COM port and debug port
Flexible power-supply options: ST-LINK, USB VBUS, or external sources
- USB VBUS or external source(3.3V, 5V, 7 - 12V)
- Power management access point
Board specific features
- External SMPS to generate Vcore logic supply
- 24 MHz HSE
- Board connectors:
  - External SMPS experimentation dedicated connector
  - Micro-AB or Mini-AB USB connector for the ST-LINK
  - MIPI® debug connector
- Arm® Mbed Enabled™ compliant

More information about the board can be found at the Nucleo L412RB-P website.

Hardware

Nucleo L412RB-P provides the following hardware components:

STM32L412RBT6 in LQFP64 package
Ultra-low-power with FlexPowerControl
- 1.71 V to 3.6 V power supply
- -40 °C to 85/125 °C temperature range
- 300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
- 16 nA Shutdown mode (4 wakeup pins)
- 32 nA Standby mode (4 wakeup pins)
- 245 nA Standby mode with RTC
- 0.7 µA Stop 2 mode, 0.95 µA with RTC
- 79 µA/MHz run mode (LDO Mode)
- 28 µA/MHz run mode (@3.3 V SMPS Mode)
- Batch acquisition mode (BAM)
- 4 µs wakeup from Stop mode
- Brown out reset (BOR)
- Interconnect matrix
Core: Arm® 32-bit Cortex® -M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™ ) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS and DSP instructions
Performance benchmark
- 1.25 DMIPS/MHz (Drystone 2.1)
- 273.55 CoreMark® (3.42 CoreMark/MHz @ 80 MHz)
Energy benchmark
- 442 ULPMark-CP®
- 165 ULPMark-PP®
Clock Sources:
- 4 to 48 MHz crystal oscillator
- 32 kHz crystal oscillator for RTC (LSE)
- Internal 16 MHz factory-trimmed RC ( ±1%)
- Internal low-power 32 kHz RC ( ±5%)
- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
- Internal 48 MHz with clock recovery
- PLL for system clock
Up to 52 fast I/Os, most 5 V-tolerant
RTC with HW calendar, alarms and calibration
Up to 12 capacitive sensing channels: support touchkey, linear and rotary touch sensors
10x timers:
- 1x 16-bit advanced motor-control
- 1x 32-bit and 2x 16-bit general purpose
- 1x 16-bit basic
- 2x low-power 16-bit timers (available in Stop mode)
- 2x watchdogs
- SysTick timer
Memories
- 128 KB single bank Flash, proprietary code readout protection
- 40 KB of SRAM including 8 KB with hardware parity check
- Quad SPI memory interface with XIP capability
Rich analog peripherals (independent supply)
- 2x 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 µA/Msps
- 2x operational amplifiers with built-in PGA
- 1x ultra-low-power comparator
- Accurate 2.5 V or 2.048 V reference voltage buffered output
12x communication interfaces - USB 2.0 full-speed crystal less solution with LPM and BCD - 3x I2C FM+(1 Mbit/s), SMBus/PMBus - 3x USARTs (ISO 7816, LIN, IrDA, modem) - 1x LPUART (Stop 2 wake-up) - 2x SPIs (and 1x Quad SPI) - IRTIM (Infrared interface)
14-channel DMA controller
True random number generator
CRC calculation unit, 96-bit unique ID
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
All packages are ECOPACK2 compliant

Note: the current board revision is C. (MB1319C)

More information about STM32L412RB can be found here:

Supported Features

The nucleo_l412rb_p board supports the hardware features listed below.

on-chip / on-board: Feature integrated in the SoC / present on the board.
2 / 2: Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo: Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

`nucleo_l412rb_p/stm32l412xx` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M4F CPU1	`arm,cortex-m4f`
ADC	on-chip	STM32 ADC1 1	`st,stm32-adc`
Clock control	on-chip	STM32 RCC (Reset and Clock controller)1	`st,stm32-rcc`
	on-chip	STM32 HSE Clock1	`st,stm32-hse-clock`
	on-chip	Generic fixed-rate clock provider2 1	`fixed-clock`
	on-chip	STM32 MSI Clock1	`st,stm32-msi-clock`
	on-chip	STM32 LSE Clock1	`st,stm32-lse-clock`
	on-chip	STM32L4/L5 main PLL1	`st,stm32l4-pll-clock`
	on-chip	STM32 Microcontroller Clock Output (MCO)1	`st,stm32-clock-mco`
Counter	on-chip	STM32 counters4	`st,stm32-counter`
DMA	on-chip	STM32 DMA controller (V2)2	`st,stm32-dma-v2`
Flash controller	on-chip	STM32 Family flash controller1	`st,stm32-flash-controller`
GPIO & Headers	on-chip	STM32 GPIO Controller4	`st,stm32-gpio`
GPIO & Headers	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	`arduino-header-r3`
I2C	on-chip	STM32 I2C V2 controller1 2	`st,stm32-i2c-v2`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	ARMv7-M NVIC (Nested Vectored Interrupt Controller)1	`arm,v7m-nvic`
Interrupt controller	on-chip	STM32 External Interrupt Controller1	`st,stm32-exti`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
MTD	on-chip	STM32 flash memory1	`st,stm32-nv-flash`
MTD	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
PHY	on-chip	This binding is to be used by all the usb transceivers which are built-in with USB IP1	`usb-nop-xceiv`
Pin control	on-chip	STM32 Pin controller1	`st,stm32-pinctrl`
Power management	on-chip	STM32 power controller1	`st,stm32-pwr`
PWM	on-chip	STM32 PWM1 3	`st,stm32-pwm`
QSPI	on-chip	STM32 QSPI Controller1	`st,stm32-qspi`
Reset controller	on-chip	STM32 Reset and Clock Control (RCC) Controller1	`st,stm32-rcc-rctl`
RNG	on-chip	STM32 Random Number Generator1	`st,stm32-rng`
RTC	on-chip	STM32 RTC1	`st,stm32-rtc`
Sensors	on-chip	STM32 family TEMP node for production calibrated sensors with two calibration temperatures1	`st,stm32-temp-cal`
	on-chip	STM32 VREF+1	`st,stm32-vref`
	on-chip	STM32 VBAT1	`st,stm32-vbat`
Serial controller	on-chip	STM32 USART3	`st,stm32-usart`
Serial controller	on-chip	STM32 LPUART1	`st,stm32-lpuart`
SMbus	on-chip	STM32 SMBus controller3	`st,stm32-smbus`
SPI	on-chip	STM32 SPI controller with embedded Rx and Tx FIFOs1 1	`st,stm32-spi-fifo`
SRAM	on-chip	Generic on-chip SRAM description1	`mmio-sram`
Timer	on-chip	ARMv7-M System Tick1	`arm,armv7m-systick`
	on-chip	STM32 timers1 4	`st,stm32-timers`
	on-chip	STM32 low-power timer (LPTIM)2	`st,stm32-lptim`
USB	on-chip	STM32 USB controller1	`st,stm32-usb`
Watchdog	on-chip	STM32 watchdog1	`st,stm32-watchdog`
Watchdog	on-chip	STM32 system window watchdog1	`st,stm32-window-watchdog`

Connections and IOs

Nucleo L412RB-P Board has 5 GPIO controllers (Ports A, B, C, D and H). These controllers are responsible for pin muxing, input/output, pull-up, etc.

Available pins:

For more details please refer to ST Nucleo L412RB-P User Manual.

Default Zephyr Peripheral Mapping:

LPUART1 TX/RX : PA2/PA3
I2C1 SCL/SDA : PB8/PB7 (Arduino I2C)
SPI2 CS/SCK/MISO/MOSI : PA11/PB13/PB14/PB15 (Arduino SPI)
UART1 TX/RX : PA9/PA10
PWM_2_CH1 : PA0
USER_PB : PC13
LD4 : PB13

Note: SPI2 CS pin (PB12) is not located on the Arduino connector.

System Clock

Nucleo L412RB-P System Clock could be driven by internal or external oscillator, as well as main PLL clock. By default System clock is driven by PLL clock at 80MHz, driven by 16MHz high speed internal oscillator.

Serial Port

Nucleo L412RB-P board has 3 U(S)ARTs and 1 LPUART. The Zephyr console output is assigned to LPUART1. Default settings are 115200 8N1.

Programming and Debugging

Nucleo L412RB-P board includes an ST-LINK/V2-1 embedded debug tool interface.

Applications for the nucleo_l412rb_p 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 runner, so its installation is required.

Alternatively, OpenOCD or JLink can also be used to flash the board using the --runner (or -r) option:

$ west flash --runner openocd
$ west flash --runner jlink

Flashing an application to Nucleo L412RB-P

Connect the Nucleo L412RB-P to your host computer using the USB port, then run a serial host program to connect with your Nucleo board.

$ minicom -D /dev/ttyACM0

Now build and flash an application. Here is an example for Hello World.

# From the root of the zephyr repository
west build -b nucleo_l412rb_p samples/hello_world
west flash

You should see the following message on the console:

$ Hello World! nucleo_l412rb_p

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 nucleo_l412rb_p samples/hello_world
west debug