ST Nucleo F446RE¶
The Nucleo F446RE board features an ARM Cortex-M4 based STM32F446RE MCU with a wide range of connectivity support and configurations. Here are some highlights of the Nucleo F446RE board:
- STM32 microcontroller in QFP64 package
- 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
- Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3)
- Two push-buttons: USER and RESET
More information about the board can be found at the Nucleo F446RE website.
Nucleo F446RE provides the following hardware components:
- STM32F446RET6 in LQFP64 package
- ARM® 32-bit Cortex®-M4 CPU with FPU
- Adaptive real-time accelerator (ART Accelerator)
- 180 MHz max CPU frequency
- VDD from 1.7 V to 3.6 V
- 512 KB Flash
- 128 KB SRAM
- 10 General purpose timers
- 2 Advanced control timers
- 2 basic timers
- USB OTG Full Speed and High Speed
- Quad SPI(1)
- Camera Interface
- GPIO(50) with external interrupt capability
- 12-bit ADC(3) with 16 channels
- 12-bit DAC with 2 channels
More information about STM32F446RE can be found here:
The Zephyr nucleo_f446re board configuration supports the following hardware features:
|NVIC||on-chip||nested vector interrupt controller|
Other hardware features are not yet supported on this Zephyr port.
The default configuration can be found in the defconfig file:
Connections and IOs¶
Nucleo F446RE Board has 8 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
Default Zephyr Peripheral Mapping:¶
- UART_1_TX : PB6
- UART_1_RX : PB7
- UART_2_TX : PA2
- UART_2_RX : PA3
- USER_PB : PC13
- LD2 : PA5
- I2C1_SDA : PB9
- I2C1_SCL : PB8
- I2C2_SDA : PB3
- I2C2_SCL : PB10
- I2C3_SDA : PB4
- I2C3_SCL : PA8
Nucleo F446RE 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 84MHz, driven by an 8MHz high-speed external clock.
Nucleo F446RE board has 2 UARTs and 4 USARTs. The Zephyr console output is assigned to UART2. Default settings are 115200 8N1.
Programming and Debugging¶
Nucleo F446RE board includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in the Zephyr SDK.
Flashing an application to Nucleo F446RE¶
Here is an example for the Hello World application.
Run a serial host program to connect with your Nucleo board.
$ minicom -b 115200 -D /dev/ttyACM0
Build and flash the application:
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world mkdir build & cd build # Use cmake to configure a Ninja-based build system: cmake -GNinja -DBOARD=nucleo_f446re .. # Now run ninja on the generated build system: ninja ninja flash
You should see the following message on the console:
$ Hello World! arm
You can debug an application in the usual way. Here is an example for the Hello World application.
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world # If you already made a build directory (build) and ran cmake, just 'cd build' instead. mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world # If you already made a build directory (build) and ran cmake, just 'cd build' instead. mkdir build & cd build # Use cmake to configure a Ninja-based build system: cmake -GNinja -DBOARD=nucleo_f446re .. # Now run ninja on the generated build system: ninja debug