STM32L476G Discovery
Overview
The STM32L476G Discovery board features an ARM Cortex-M4 based STM32L476VG MCU with a wide range of connectivity support and configurations. Here are some highlights of the STM32L476G Discovery board:
STM32L476VGT6 microcontroller featuring 1 Mbyte of Flash memory, 128 Kbytes of RAM in LQFP100 package
On-board ST-LINK/V2-1 supporting USB re-enumeration capability
Three different interfaces supported on USB:
Virtual com port
Mass storage
Debug port
LCD 24 segments, 4 commons in DIP 28 package
Seven LEDs:
LD1 (red/green) for USB communication
LD2 (red) for 3.3 V power on
LD3 Over current (red)
LD4 (red), LD5 (green) two user LEDs
LD6 (green), LD7 (red) USB OTG FS LEDs
Pushbutton (reset)
Four directions Joystick with selection
USB OTG FS with micro-AB connector
SAI Audio DAC, Stereo with output jack
Digital microphone, accelerometer, magnetometer and gyroscope MEMS
128-Mbit Quad-SPI Flash memory
MCU current ammeter with 4 ranges and auto-calibration
Connector for external board or RF-EEPROM
- Four power supply options:
ST-LINK/V2-1
USB FS connector
External 5 V
CR2032 battery (not provided)
More information about the board can be found at the STM32L476G Discovery website.
Hardware
The STM32L476VG SoC provides the following hardware features:
Ultra-low-power with FlexPowerControl (down to 130 nA Standby mode and 100 uA/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)
3 PLLs for system clock, USB, audio, ADC
RTC with HW calendar, alarms and calibration
LCD 8 x 40 or 4 x 44 with step-up converter
Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
- 16x timers:
2x 16-bit advanced motor-control
2x 32-bit and 5x 16-bit general purpose
2x 16-bit basic
2x low-power 16-bit timers (available in Stop mode)
2x watchdogs
SysTick timer
Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
- Memories
Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
Up to 128 KB of SRAM including 32 KB with hardware parity check
External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
Quad SPI memory interface
4x digital filters for sigma delta modulator
- Rich analog peripherals (independent supply)
3x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 uA/MSPS
2x 12-bit DAC, low-power sample and hold
2x operational amplifiers with built-in PGA
2x ultra-low-power comparators
- 18x communication interfaces
USB OTG 2.0 full-speed, LPM and BCD
2x SAIs (serial audio interface)
3x I2C FM+(1 Mbit/s), SMBus/PMBus
6x USARTs (ISO 7816, LIN, IrDA, modem)
3x SPIs (4x SPIs with the Quad SPI)
CAN (2.0B Active) and SDMMC interface
SWPMI single wire protocol master I/F
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 STM32L476VG can be found here:
Supported Features
The stm32l476g_disco 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.
stm32l476g_disco/stm32l476xx target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
STM32 ADC3 |
|
CAN |
on-chip |
STM32 CAN controller1 |
|
Clock control |
on-chip |
STM32 RCC (Reset and Clock controller)1 |
|
on-chip |
STM32 HSE Clock1 |
||
on-chip |
Generic fixed-rate clock provider2 |
||
on-chip |
STM32 MSI Clock1 |
||
on-chip |
STM32 LSE Clock1 |
||
on-chip |
STM32L4/L5 main PLL1 |
||
on-chip |
STM32 Microcontroller Clock Output (MCO)1 |
||
Counter |
on-chip |
STM32 counters9 |
|
DAC |
on-chip |
STM32 family DAC1 |
|
DMA |
on-chip |
STM32 DMA controller (V2)2 |
|
Flash controller |
on-chip |
STM32 Family flash controller1 |
|
GPIO & Headers |
on-chip |
STM32 GPIO Controller8 |
|
I2C |
on-chip |
STM32 I2C V2 controller3 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
on-chip |
STM32 External Interrupt Controller1 |
||
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Memory controller |
on-chip |
STM32 Battery Backed RAM1 |
|
MMC |
on-chip |
STM32 SDMMC Disk Access1 |
|
MTD |
on-chip |
STM32 flash memory1 |
|
PHY |
on-chip |
This binding is to be used by all the usb transceivers which are built-in with USB IP1 |
|
Pin control |
on-chip |
STM32 Pin controller1 |
|
Power management |
on-chip |
STM32 power controller1 |
|
PWM |
on-chip |
STM32 PWM9 |
|
QSPI |
on-chip |
STM32 QSPI Controller1 |
|
Reset controller |
on-chip |
STM32 Reset and Clock Control (RCC) Controller1 |
|
RNG |
on-chip |
STM32 Random Number Generator1 |
|
RTC |
on-chip |
STM32 RTC1 |
|
Sensors |
on-chip |
STM32 family TEMP node for production calibrated sensors with two calibration temperatures1 |
|
on-chip |
STM32 VREF+1 |
||
on-chip |
STM32 VBAT1 |
||
Serial controller |
on-chip |
||
on-chip |
STM32 LPUART1 |
||
on-chip |
STM32 UART2 |
||
SMbus |
on-chip |
STM32 SMBus controller3 |
|
SPI |
on-chip |
STM32 SPI controller with embedded Rx and Tx FIFOs3 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
on-chip |
STM32 timers11 |
||
on-chip |
STM32 low-power timer (LPTIM)2 |
||
USB |
on-chip |
STM32 OTGFS controller1 |
|
Watchdog |
on-chip |
STM32 watchdog1 |
|
on-chip |
STM32 system window watchdog1 |
Connections and IOs
STM32L476G Discovery Board has 8 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
For more details please refer to STM32L476G Discovery board User Manual.
Default Zephyr Peripheral Mapping:
UART_2_TX : PD5
UART_2_RX : PD6
LD4 : PB2
LD5 : PE8
System Clock
STM32L476G Discovery System Clock could be driven by an internal or external oscillator, as well as the main PLL clock. By default the System clock is driven by the PLL clock at 80MHz, driven by 16MHz high speed internal oscillator.
Serial Port
STM32L476G Discovery board has 6 U(S)ARTs. The Zephyr console output is assigned to UART2. Default settings are 115200 8N1.
Programming and Debugging
STM32L476G Discovery board includes an ST-LINK/V2-1 embedded debug tool interface.
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 STM32L476G Discovery
Connect the STM32L476G Discovery to your host computer using the USB port, then run a serial host program to connect with your Discovery board. For example:
$ minicom -D /dev/ttyACM0
Then, build and flash in the usual way. Here is an example for the Hello World application.
# From the root of the zephyr repository
west build -b stm32l476g_disco 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 stm32l476g_disco samples/hello_world
west debug