221 lines
7.2 KiB
ReStructuredText
221 lines
7.2 KiB
ReStructuredText
.. _stm32l476g_disco_board:
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ST STM32L476G Discovery
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########################
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Overview
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********
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The STM32L476G Discovery board features an ARM Cortex-M4 based STM32L476VG MCU
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with a wide range of connectivity support and configurations. Here are
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some highlights of the STM32L476G Discovery board:
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- STM32L476VGT6 microcontroller featuring 1 Mbyte of Flash memory, 128 Kbytes of RAM in LQFP100 package
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- On-board ST-LINK/V2-1 supporting USB re-enumeration capability
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- Three different interfaces supported on USB:
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- Virtual com port
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- Mass storage
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- Debug port
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- LCD 24 segments, 4 commons in DIP 28 package
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- Seven LEDs:
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- LD1 (red/green) for USB communication
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- LD2 (red) for 3.3 V power on
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- LD3 Over current (red)
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- LD4 (red), LD5 (green) two user LEDs
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- LD6 (green), LD7 (red) USB OTG FS LEDs
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- Pushbutton (reset)
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- Four directions Joystick with selection
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- USB OTG FS with micro-AB connector
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- SAI Audio DAC, Stereo with output jack
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- Digital microphone, accelerometer, magnetometer and gyroscope MEMS
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- 128-Mbit Quad-SPI Flash memory
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- MCU current ammeter with 4 ranges and auto-calibration
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- Connector for external board or RF-EEPROM
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- Four power supply options:
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- ST-LINK/V2-1
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- USB FS connector
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- External 5 V
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- CR2032 battery (not provided)
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.. image:: img/stm32l476g_disco.jpg
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:width: 450px
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:align: center
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:height: 394px
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:alt: STM32L476G Discovery
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More information about the board can be found at the `STM32L476G Discovery website`_.
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Hardware
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********
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The STM32L476VG SoC provides the following hardware features:
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- Ultra-low-power with FlexPowerControl (down to 130 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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- LCD 8 x 40 or 4 x 44 with step-up converter
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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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- 3x 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 STM32L476VG can be found here:
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- `STM32L476VG on www.st.com`_
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- `STM32L476 reference manual`_
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Supported Features
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==================
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The Zephyr stm32l476g_disco 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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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/arm/stm32l476g_disco/stm32l476g_disco_defconfig``
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Connections and IOs
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===================
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STM32L476G Discovery 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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For mode details please refer to `STM32L476G Discovery board User Manual`_.
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Default Zephyr Peripheral Mapping:
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----------------------------------
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- UART_2_TX : PD5
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- UART_2_RX : PD6
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- LD4 : PB2
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- LD5 : PE8
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System Clock
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------------
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STM32L476G Discovery System Clock could be driven by an internal or external oscillator,
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as well as the main PLL clock. By default the System clock is driven by the 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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STM32L476G Discovery board has 6 U(S)ARTs. The Zephyr console output is assigned to UART2.
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Default settings are 115200 8N1.
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Programming and Debugging
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*************************
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Flashing
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========
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STM32L476G Discovery board includes an ST-LINK/V2-1 embedded debug tool interface.
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This interface is supported by the openocd version included in Zephyr SDK.
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Flashing an application to STM32L476G Discovery
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-----------------------------------------------
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Connect the STM32L476G Discovery to your host computer using the USB
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port, then run a serial host program to connect with your Discovery
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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 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: stm32l476g_disco
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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: stm32l476g_disco
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:maybe-skip-config:
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:goals: debug
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.. _STM32L476G Discovery website:
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http://www.st.com/en/evaluation-tools/32l476gdiscovery.html
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.. _STM32L476G Discovery board User Manual:
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http://www.st.com/resource/en/user_manual/dm00172179.pdf
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.. _STM32L476VG on www.st.com:
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http://www.st.com/en/microcontrollers/stm32l476vg.html
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.. _STM32L476 reference manual:
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http://www.st.com/resource/en/reference_manual/DM00083560.pdf
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