1.. _nucleo_l452re_board: 2 3ST Nucleo L452RE 4################ 5 6Overview 7******** 8 9The Nucleo L452RE(-P) boards feature an ARM Cortex-M4 based STM32L452RE MCU 10with a wide range of connectivity support and configurations. There are two variants: 11 12- ST Nucleo L452RE 13- ST Nucleo L452RE-P 14 15Here some highlights of these boards: 16 17- STM32 microcontroller in LQFP64 package 18- Arduino Uno V3 connectivity 19- On-board ST-LINK/V2-1 debugger/programmer with SWD connector 20- Flexible board power supply: 21 22 - USB VBUS or external source(3.3V, 5V, 7 - 12V) 23 - Power management access point 24 25- Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3) 26- One push-button: RESET 27 28.. image:: img/nucleo_l452re_p.jpg 29 :align: center 30 :alt: Nucleo L452RE-P 31 32The main difference between the ST Nucleo L452RE and the L452RE-P (note the missing 33"-P" at the end) lays in the External Switched Mode Power Supply (SMPS) included in 34the P series. 35 36More information about the boards can be found at the `Nucleo L452RE website`_ and 37the `Nucleo L452RE-P website`_. 38 39Hardware 40******** 41 42The STM32L452RE SoC provides the following hardware IPs: 43 44- Ultra-low-power with FlexPowerControl (down to 28 nA Standby mode and 84 45 |micro| A/MHz run mode) 46- Core: ARM |reg| 32-bit Cortex |reg| -M4 CPU with FPU, frequency up to 80 MHz, 47 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1) 48- Clock Sources: 49 50 - 4 to 48 MHz crystal oscillator 51 - 32 kHz crystal oscillator for RTC (LSE) 52 - Internal 16 MHz factory-trimmed RC ( |plusminus| 1%) 53 - Internal low-power 32 kHz RC ( |plusminus| 5%) 54 - Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by 55 LSE (better than |plusminus| 0.25 % accuracy) 56 - 2 PLLs for system clock, USB, audio, ADC 57 58- RTC with HW calendar, alarms and calibration 59- Up to 3 capacitive sensing channels: support touchkey, linear and rotary touch sensors 60- 12x timers: 61 62 - 1x 16-bit advanced motor-control 63 - 1x 32-bit and 3x 16-bit general purpose 64 - 2x 16-bit basic 65 - 2x low-power 16-bit timers (available in Stop mode) 66 - 2x watchdogs 67 - SysTick timer 68 69- Up to 26 fast I/Os, most 5 V-tolerant 70- Memories 71 72 - Up to 512 KB single bank Flash, proprietary code readout protection 73 - 160 KB of SRAM including 32 KB with hardware parity check 74 - Quad SPI memory interface 75 76- Rich analog peripherals (independent supply) 77 78 - 1x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 79 |micro| A/MSPS 80 - 2x 12-bit DAC, low-power sample and hold 81 - 1x operational amplifiers with built-in PGA 82 - 2x ultra-low-power comparators 83 84- 17x communication interfaces 85 - USB 2.0 full-speed crystal less solution with LPM and BCD 86 - 1x SAI (serial audio interface) 87 - 4x I2C FM+(1 Mbit/s), SMBus/PMBus 88 - 3x USARTs (ISO 7816, LIN, IrDA, modem) 89 - 1x UART (LIN, IrDA, modem) 90 - 1x LPUART (Stop 2 wake-up) 91 - 3x SPIs (and 1x Quad SPI) 92 - CAN (2.0B Active) and SDMMC interface 93 - IRTIM (Infrared interface) 94 95- 14-channel DMA controller 96- True random number generator 97- CRC calculation unit, 96-bit unique ID 98- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell* 99 100 101More information about STM32L452RE can be found here: 102 103- `STM32L452RE on www.st.com`_ 104- `STM32L452 reference manual`_ 105 106Supported Features 107================== 108 109The Zephyr nucleo_l452re board configuration supports the following hardware features: 110 111+-----------+------------+-------------------------------------+ 112| Interface | Controller | Driver/Component | 113+===========+============+=====================================+ 114| NVIC | on-chip | nested vector interrupt controller | 115+-----------+------------+-------------------------------------+ 116| UART | on-chip | serial port-polling; | 117| | | serial port-interrupt | 118+-----------+------------+-------------------------------------+ 119| PINMUX | on-chip | pinmux | 120+-----------+------------+-------------------------------------+ 121| GPIO | on-chip | gpio | 122+-----------+------------+-------------------------------------+ 123| I2C | on-chip | i2c | 124+-----------+------------+-------------------------------------+ 125| PWM | on-chip | pwm | 126+-----------+------------+-------------------------------------+ 127| CAN | on-chip | can | 128+-----------+------------+-------------------------------------+ 129 130.. note:: CAN feature requires CAN transceiver 131 132Other hardware features are not yet supported on this Zephyr port. 133 134The default configuration can be found in the defconfig file: 135``boards/arm/nucleo_l452re/nucleo_l452re_defconfig`` 136 137 138Connections and IOs 139=================== 140 141Nucleo L452RE Board has 6 GPIO controllers. These controllers are responsible for pin muxing, 142input/output, pull-up, etc. 143 144Available pins: 145--------------- 146.. image:: img/nucleo_l452re_pinout.jpg 147 :align: center 148 :alt: Nucleo L452RE Pinout 149 150.. image:: img/nucleo_l452re_p_pinout.jpg 151 :align: center 152 :alt: Nucleo L452RE-P Pinout 153 154For more details please refer to `ST Nucleo L452RE User Manual`_ or 155`ST Nucleo L452RE-P User Manual`_. 156 157Default Zephyr Peripheral Mapping: 158---------------------------------- 159 160- UART_1_TX : PA9 161- UART_1_RX : PA10 162- UART_2_TX : PA2 163- UART_2_RX : PA3 164- I2C_1_SCL : PB8 165- I2C_1_SDA : PB7 166- PWM_2_CH1 : PA0 167- SPI_NSS : PB6 168- SPI_SCK : PA5 169- SPI_MISO : PA6 170- SPI_MOSI : PA7 171- CAN_TX : PA11 172- CAN_RX : PA12 173- LD2 : PA5 174 175System Clock 176------------ 177 178Nucleo L452RE System Clock could be driven by internal or external oscillator, 179as well as main PLL clock. By default System clock is driven by PLL clock at 80MHz, 180driven by 16MHz high speed internal oscillator. 181 182Serial Port 183----------- 184 185Nucleo L452RE board has 3 U(S)ARTs. The Zephyr console output is assigned to UART2. 186Default settings are 115200 8N1. 187 188 189Programming and Debugging 190************************* 191 192Applications for the ``nucleo_l452re`` board configuration can be built and 193flashed in the usual way (see :ref:`build_an_application` and 194:ref:`application_run` for more details). 195 196Flashing 197======== 198 199Nucleo L452RE board includes an ST-LINK/V2-1 embedded debug tool 200interface. This interface is supported by the openocd version 201included in the Zephyr SDK since v0.9.2. 202 203Flashing an application to Nucleo L452RE 204---------------------------------------- 205 206Connect the Nucleo L452RE to your host computer using the USB port, 207then run a serial host program to connect with your Nucleo board. 208 209.. code-block:: console 210 211 $ minicom -D /dev/ttyACM0 212 213Now build and flash an application. Here is an example for 214:ref:`hello_world`. 215 216.. zephyr-app-commands:: 217 :zephyr-app: samples/hello_world 218 :board: nucleo_l452re 219 :goals: build flash 220 221You should see the following message on the console: 222 223.. code-block:: console 224 225 $ Hello World! arm 226 227 228Debugging 229========= 230 231You can debug an application in the usual way. Here is an example for the 232:ref:`hello_world` application. 233 234.. zephyr-app-commands:: 235 :zephyr-app: samples/hello_world 236 :board: nucleo_l452re 237 :maybe-skip-config: 238 :goals: debug 239 240.. _Nucleo L452RE website: 241 https://www.st.com/en/evaluation-tools/nucleo-l452re.html 242 243.. _Nucleo L452RE-P website: 244 https://www.st.com/en/evaluation-tools/nucleo-l452re-p.html 245 246.. _ST Nucleo L452RE User Manual: 247 https://www.st.com/resource/en/user_manual/dm00105823.pdf 248 249.. _ST Nucleo L452RE-P User Manual: 250 https://www.st.com/resource/en/user_manual/dm00387966.pdf 251 252.. _STM32L452RE on www.st.com: 253 https://www.st.com/en/microcontrollers-microprocessors/stm32l452re.html 254 255.. _STM32L452 reference manual: 256 https://www.st.com/resource/en/reference_manual/dm00151940.pdf 257
