ST Nucleo L4A6ZG
Overview
The Nucleo L4A6ZG board features an ARM Cortex-M4 based STM32L4A6ZG MCU with a wide range of connectivity support and configurations. Here are some highlights of the Nucleo L4A6ZG board:
STM32 microcontroller in QFP144 package
USB OTG FS with Micro-AB connector
Two types of extension resources:
Arduino Uno V3 connectivity
ST morpho extension pin headers for full access to all STM32 I/Os
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
8 LEDs: user LEDs (LD1, LD2, LD3), communication LED (LD4), USB power fault(LD5), power LED (LD6), USB FS OTG (LD7, LD8)
2 push buttons: USER and RESET
More information about the board can be found at the Nucleo L4A6ZG website.
Hardware
The STM32L4A6ZG SoC provides the following hardware capabilities:
Ultra-low-power with FlexPowerControl (down to 108 nA Standby mode and 91 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 136 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 320 KB of SRAM including 64 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
20x communication interfaces
USB OTG 2.0 full-speed, LPM and BCD
2x SAIs (serial audio interface)
4x I2C FM+(1 Mbit/s), SMBus/PMBus
5x U(S)ARTs (ISO 7816, LIN, IrDA, modem)
1x LPUART
3x SPIs (4x SPIs with the Quad SPI)
2x CAN (2.0B Active) and SDMMC interface
SWPMI single wire protocol master I/F
IRTIM (Infrared interface)
14-channel DMA controller
True random number generator
CRC calculation unit, 96-bit unique ID
AES and HASH hardware accelerators
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
More information about STM32L4A6ZG can be found here:
Supported Features
The Zephyr nucleo_l4a6zg board configuration supports the following hardware features:
Interface |
Controller |
Driver/Component |
|---|---|---|
AES |
on-chip |
crypto |
FLASH |
on-chip |
flash memory |
GPIO |
on-chip |
gpio |
I2C |
on-chip |
i2c |
NVIC |
on-chip |
nested vector interrupt controller |
PINMUX |
on-chip |
pinmux |
PWM |
on-chip |
pwm |
RTC |
on-chip |
rtc |
SPI |
on-chip |
spi |
UART |
on-chip |
serial port-polling; serial port-interrupt |
WATCHDOG |
on-chip |
System Window Watchdog |
Other hardware features are not yet supported on this Zephyr port.
The default configuration can be found in the defconfig file: boards/st/nucleo_l4a6zg/nucleo_l4a6zg_defconfig
Connections and IOs
Nucleo L4A6ZG Board has 8 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
For more details please refer to STM32 Nucleo-144 board User Manual.
Default Zephyr Peripheral Mapping:
LPUART_1 TX/RX : PG7/PG8 (ST-Link Virtual COM Port)
UART_3 TX/RX : PD8/PD9 (Arduino Serial)
I2C_1 SCL/SDA : PB8/PB7 (Arduino I2C)
SPI_1 SCK/MISO/MOSI/NSS : PA5/PA6/PA7/PD14 (Arduino SPI)
USER_PB : PC13
PWM_15_CH1 : PB14 (Red LED)
LD1 : PC7 (Green LED)
LD2 : PB7 (Blue LED)
LD3 : PB14 (Red LED)
System Clock
Nucleo L4A6ZG system clock could be driven by internal or external oscillator, as well as main PLL clock. By default, system clock is driven by PLL at 80MHz, which is driven by 16MHz high speed internal oscillator (HSI). High speed external oscillator (HSE) is not soldered on the board, so it cannot be used to drive the PLL.
Serial Port
Nucleo L4A6ZG board has 5 UARTs. The Zephyr console output is assigned to LPUART1, which is connected to the onboard ST-LINK/V2-1. Virtual COM port interface. Default settings are 115200 8N1.
Programming and Debugging
Applications for the nucleo_l4a6zg board configuration can be built and
flashed in the usual way (see Building an Application and
Run an Application for more details).
Flashing
Nucleo L4A6ZG board includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the OpenOCD version included in the Zephyr SDK since v0.9.5.
Flashing an application to Nucleo L4A6ZG
Connect the Nucleo L4A6ZG to your host computer using the ST-LINK USB port. Then build and flash an application. Here is an example for the Hello World application.
Run a serial host program to connect with your Nucleo board:
$ minicom -D /dev/ttyUSB0
Then build and flash the application.
# From the root of the zephyr repository
west build -b nucleo_l4a6zg samples/hello_world
west flash
You should see the following message on the console:
Hello World! nucleo_l4a6zg
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_l4a6zg samples/hello_world
west debug