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248 lines
9.2 KiB
248 lines
9.2 KiB
.. _disco_l475_iot1_board: |
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ST Disco L475 IOT01 (B-L475E-IOT01A) |
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#################################### |
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Overview |
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The B-L475E-IOT01A Discovery kit for IoT node allows users to develop |
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applications with direct connection to cloud servers. |
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The Discovery kit enables a wide diversity of applications by exploiting |
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low-power communication, multiway sensing and ARM |reg| Cortex |reg|-M4 core-based |
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STM32L4 Series features. |
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This kit provides: |
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- 64-Mbit Quad-SPI (Macronix) Flash memory |
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- Bluetooth |reg| V4.1 module (SPBTLE-RF) |
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- Sub-GHz (868 or 915 MHz) low-power-programmable RF module (SPSGRF-868 or SPSGRF-915) |
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- Wi-Fi |reg| module Inventek ISM43362-M3G-L44 (802.11 b/g/n compliant) |
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- Dynamic NFC tag based on M24SR with its printed NFC antenna |
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- 2 digital omni-directional microphones (MP34DT01) |
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- Capacitive digital sensor for relative humidity and temperature (HTS221) |
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- High-performance 3-axis magnetometer (LIS3MDL) |
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- 3D accelerometer and 3D gyroscope (LSM6DSL) |
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- 260-1260 hPa absolute digital output barometer (LPS22HB) |
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- Time-of-Flight and gesture-detection sensor (VL53L0X) |
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- 2 push-buttons (user and reset) |
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- USB OTG FS with Micro-AB connector |
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- Expansion connectors: |
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- Arduino |trade| Uno V3 |
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- PMOD |
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- Flexible power-supply options: |
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- ST LINK USB VBUS or external sources |
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- On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability: |
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- mass storage, virtual COM port and debug port |
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.. image:: img/disco_l475_iot1.jpg |
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:align: center |
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:alt: Disco L475 IoT1 |
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More information about the board can be found at the `Disco L475 IoT1 website`_. |
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Hardware |
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The STM32L475VG SoC provides the following hardware IPs: |
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- Ultra-low-power with FlexPowerControl (down to 120 nA Standby mode and 100 uA/MHz run mode) |
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- Core: ARM |reg| 32-bit Cortex |reg|-M4 CPU with FPU, frequency up to 80 MHz, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1) |
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- Clock Sources: |
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- 4 to 48 MHz crystal oscillator |
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- 32 kHz crystal oscillator for RTC (LSE) |
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- Internal 16 MHz factory-trimmed RC ( |plusminus| 1%) |
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- Internal low-power 32 kHz RC ( |plusminus| 5%) |
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- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by |
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LSE (better than |plusminus| 0.25 % accuracy) |
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- 3 PLLs for system clock, USB, audio, ADC |
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- RTC with HW calendar, alarms and calibration |
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- Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors |
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- 16x timers: |
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- 2x 16-bit advanced motor-control |
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- 2x 32-bit and 5x 16-bit general purpose |
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- 2x 16-bit basic |
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- 2x low-power 16-bit timers (available in Stop mode) |
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- 2x watchdogs |
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- SysTick timer |
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- Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V |
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- Memories |
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- Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection |
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- Up to 128 KB of SRAM including 32 KB with hardware parity check |
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- External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories |
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- Quad SPI memory interface |
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- 4x digital filters for sigma delta modulator |
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- Rich analog peripherals (independent supply) |
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- 2x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 uA/MSPS |
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- 2x 12-bit DAC, low-power sample and hold |
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- 2x operational amplifiers with built-in PGA |
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- 2x ultra-low-power comparators |
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- 18x communication interfaces |
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- USB OTG 2.0 full-speed, LPM and BCD |
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- 2x SAIs (serial audio interface) |
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- 3x I2C FM+(1 Mbit/s), SMBus/PMBus |
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- 6x USARTs (ISO 7816, LIN, IrDA, modem) |
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- 3x SPIs (4x SPIs with the Quad SPI) |
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- CAN (2.0B Active) and SDMMC interface |
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- SWPMI single wire protocol master I/F |
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- 14-channel DMA controller |
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- True random number generator |
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- CRC calculation unit, 96-bit unique ID |
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- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell |trade| |
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More information about STM32L475VG can be found here: |
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- `STM32L475VG on www.st.com`_ |
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- `STM32L475 reference manual`_ |
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Supported Features |
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================== |
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The Zephyr Disco L475 IoT board configuration supports the following hardware features: |
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+-----------+------------+-------------------------------------+ |
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| Interface | Controller | Driver/Component | |
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+===========+============+=====================================+ |
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| NVIC | on-chip | nested vector interrupt controller | |
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+-----------+------------+-------------------------------------+ |
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| UART | on-chip | serial port-polling; | |
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| | | serial port-interrupt | |
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+-----------+------------+-------------------------------------+ |
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| PINMUX | on-chip | pinmux | |
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+-----------+------------+-------------------------------------+ |
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| GPIO | on-chip | gpio | |
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+-----------+------------+-------------------------------------+ |
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| FLASH | on-chip | flash memory | |
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+-----------+------------+-------------------------------------+ |
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| I2C | on-chip | i2c | |
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+-----------+------------+-------------------------------------+ |
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| SPI | on-chip | spi | |
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+-----------+------------+-------------------------------------+ |
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| PWM | on-chip | pwm | |
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+-----------+------------+-------------------------------------+ |
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| WATCHDOG | on-chip | independent watchdog | |
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+-----------+------------+-------------------------------------+ |
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| DAC | on-chip | DAC Controller | |
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+-----------+------------+-------------------------------------+ |
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| ADC | on-chip | adc | |
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+-----------+------------+-------------------------------------+ |
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| QSPI NOR | on-chip | off-chip flash | |
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+-----------+------------+-------------------------------------+ |
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| die-temp | on-chip | die temperature sensor | |
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+-----------+------------+-------------------------------------+ |
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Other hardware features are not yet supported on this Zephyr port. |
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The default configuration can be found in the defconfig file: |
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``boards/st/disco_l475_iot1/disco_l475_iot1_defconfig`` |
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Connections and IOs |
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=================== |
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Disco L475 IoT Board has 8 GPIO controllers. These controllers are responsible for pin muxing, |
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input/output, pull-up, etc. |
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Available pins: |
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--------------- |
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For detailed information about available pins please refer to `STM32 Disco L475 IoT1 board User Manual`_. |
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Default Zephyr Peripheral Mapping: |
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---------------------------------- |
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- UART_1 TX/RX : PB6/PB7 (ST-Link Virtual Port Com) |
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- UART_4 TX/RX : PA0/PA1 (Arduino Serial) |
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- I2C1 SCL/SDA : PB8/PB9 (Arduino I2C) |
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- I2C2 SCL/SDA : PB10/PB11 (Sensor I2C bus) |
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- I2C3 SCL/SDA : PC0/PC1 |
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- SPI1 NSS/SCK/MISO/MOSI : PA2/PA5/PA6/PA7 (Arduino SPI) |
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- SPI3 SCK/MISO/MOSI : PC10/PC11/PC12 (BT SPI bus) |
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- PWM_2_CH1 : PA15 |
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- USER_PB : PC13 |
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- LD2 : PA5 |
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- ADC12_IN5 : PA0 |
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- ADC123_IN3 : PC2 |
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- ADC123_IN4 : PC3 |
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- ADC12_IN13 : PC4 |
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- ADC12_IN14 : PC5 |
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- DAC1_OUT1 : PA4 |
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System Clock |
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------------ |
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Disco L475 IoT System Clock could be driven by internal or external oscillator, |
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as well as main PLL clock. By default System clock is driven by PLL clock at 80MHz, |
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driven by 16MHz high speed internal oscillator. |
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Serial Port |
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----------- |
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Disco L475 IoT board has 6 U(S)ARTs. The Zephyr console output is assigned to UART1. |
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Default settings are 115200 8N1. |
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Programming and Debugging |
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************************* |
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Applications for the ``disco_l475_iot1`` board configuration can be built and |
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flashed in the usual way (see :ref:`build_an_application` and |
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:ref:`application_run` for more details). |
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Flashing |
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======== |
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Disco L475 IoT board includes an ST-LINK/V2-1 embedded debug tool |
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interface. This interface is supported by the openocd version |
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included in the Zephyr SDK since v0.9.2. |
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Flashing an application to Disco L475 IoT |
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----------------------------------------- |
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Here is an example for the :ref:`hello_world` application. |
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Connect the Disco L475 IoT to your host computer using the USB port, then |
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run a serial host program to connect with your Nucleo board. For example: |
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.. code-block:: console |
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$ minicom -D /dev/ttyACM0 |
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Then build and flash the application: |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: disco_l475_iot1 |
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:goals: build flash |
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You should see the following message on the console: |
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.. code-block:: console |
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$ Hello World! arm |
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Debugging |
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========= |
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You can debug an application in the usual way. Here is an example for the |
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:ref:`hello_world` application. |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: disco_l475_iot1 |
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:maybe-skip-config: |
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:goals: debug |
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.. _Disco L475 IoT1 website: |
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https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-eval-tools/stm32-mcu-eval-tools/stm32-mcu-discovery-kits/b-l475e-iot01a.html |
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.. _STM32 Disco L475 IoT1 board User Manual: |
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https://www.st.com/resource/en/user_manual/dm00347848.pdf |
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.. _STM32L475VG on www.st.com: |
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https://www.st.com/en/microcontrollers-microprocessors/stm32l475vg.html |
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.. _STM32L475 reference manual: |
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https://www.st.com/resource/en/reference_manual/dm00083560.pdf
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