Nucleo L452RE
Overview
The Nucleo L452RE(-P) boards feature an ARM Cortex-M4 based STM32L452RE MCU with a wide range of connectivity support and configurations. There are two variants:
ST Nucleo L452RE
ST Nucleo L452RE-P
Here some highlights of these boards:
STM32 microcontroller in LQFP64 package
Arduino Uno V3 connectivity
On-board ST-LINK/V2-1 debugger/programmer with SWD connector
Flexible board power supply:
USB VBUS or external source(3.3V, 5V, 7 - 12V)
Power management access point
Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3)
One push-button: RESET
The main difference between the ST Nucleo L452RE and the L452RE-P (note the missing “-P” at the end) lays in the External Switched Mode Power Supply (SMPS) included in the P series.
More information about the boards can be found at the Nucleo L452RE website and the Nucleo L452RE-P website.
Hardware
The STM32L452RE SoC provides the following hardware IPs:
Ultra-low-power with FlexPowerControl (down to 28 nA Standby mode and 84 µA/MHz run mode)
Core: ARM® 32-bit Cortex® -M4 CPU with FPU, frequency up to 80 MHz, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1)
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)
2 PLLs for system clock, USB, audio, ADC
RTC with HW calendar, alarms and calibration
Up to 3 capacitive sensing channels: support touchkey, linear and rotary touch sensors
12x timers:
1x 16-bit advanced motor-control
1x 32-bit and 3x 16-bit general purpose
2x 16-bit basic
2x low-power 16-bit timers (available in Stop mode)
2x watchdogs
SysTick timer
Up to 26 fast I/Os, most 5 V-tolerant
Memories
Up to 512 KB single bank Flash, proprietary code readout protection
160 KB of SRAM including 32 KB with hardware parity check
Quad SPI memory interface
Rich analog peripherals (independent supply)
1x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 µA/MSPS
2x 12-bit DAC, low-power sample and hold
1x operational amplifiers with built-in PGA
2x ultra-low-power comparators
17x communication interfaces - USB 2.0 full-speed crystal less solution with LPM and BCD - 1x SAI (serial audio interface) - 4x I2C FM+(1 Mbit/s), SMBus/PMBus - 3x USARTs (ISO 7816, LIN, IrDA, modem) - 1x UART (LIN, IrDA, modem) - 1x LPUART (Stop 2 wake-up) - 3x SPIs (and 1x Quad SPI) - CAN (2.0B Active) and SDMMC interface - 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*
More information about STM32L452RE can be found here:
Supported Features
The Zephyr nucleo_l452re 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 |
I2C |
on-chip |
i2c |
PWM |
on-chip |
pwm |
CAN |
on-chip |
can |
Note
CAN feature requires CAN transceiver
Other hardware features are not yet supported on this Zephyr port.
The default configuration can be found in the defconfig file: boards/st/nucleo_l452re/nucleo_l452re_defconfig
And for Nucleo L452RE-P in this defconfig file: boards/st/nucleo_l452re/nucleo_l452re_stm32l452xx_p_defconfig
Connections and IOs
Nucleo L452RE Board has 6 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
Available pins:
For more details please refer to ST Nucleo L452RE User Manual or ST Nucleo L452RE-P User Manual.
Default Zephyr Peripheral Mapping:
UART_1_TX : PA9
UART_1_RX : PA10
UART_2_TX : PA2
UART_2_RX : PA3
I2C_1_SCL : PB8
I2C_1_SDA : PB7
PWM_2_CH1 : PA0
SPI_NSS : PB6
SPI_SCK : PA5
SPI_MISO : PA6
SPI_MOSI : PA7
CAN_TX : PA11
CAN_RX : PA12
LD2 : PA5
System Clock
Nucleo L452RE 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 L452RE board has 3 U(S)ARTs. The Zephyr console output is assigned to UART2. Default settings are 115200 8N1.
Programming and Debugging
Nucleo L452RE board includes an ST-LINK/V2-1 embedded debug tool interface.
Applications for the nucleo_l452re 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 L452RE
Connect the Nucleo L452RE 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_l452re samples/hello_world
west flash
For Nucleo L452RE-P, use this command instead:
# From the root of the zephyr repository
west build -b nucleo_l452re/stm32l452xx/p samples/hello_world
west flash
You should see the following message on the console:
$ Hello World! arm
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_l452re samples/hello_world
west debug