123 lines
2.7 KiB
Plaintext
123 lines
2.7 KiB
Plaintext
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README
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======
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This is the README file for a port of NuttX to the ST Micro B-G474E-DPOW1
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Discovery kit with STM32G474RE MCU. For more information about this board,
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see:
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https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/b-g474e-dpow1.html
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Contents
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========
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- Status
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- Development Environment
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- Toolchains
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- Debugging
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- Hardware
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- MCU Clocking
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- GPIOs
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- Buttons
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- LEDs
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- RGB Power LED
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- Serial Consoles
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- Configurations
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Status
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======
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This port boots NuttX through to a functional NSH prompt.
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Development Environment
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=======================
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Toolchains
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----------
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An appropriate ARM toolchain is needed, such as the one built with the
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customized NuttX buildroot or the ready-made GNU Tools for Arm Embedded
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Processors.
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Debugging
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---------
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The board incorporates a STLINK-V3E programmer/debugger accessible via the
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Micro-USB Type B connector.
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To debug with OpenOCD and arm-nuttx-eabi-gdb:
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* Use 'make menuconfig' to set CONFIG_DEBUG_SYMBOLS and CONFIG_DEBUG_NOOPT.
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To see debug output, e.g., the "ABCDE" printed in __start(), also set
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CONFIG_DEBUG_FEATURES.
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* Build NuttX.
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* Flash the code using:
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$ openocd -f interface/stlink.cfg -f target/stm32g4x.cfg -c init \
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-c "reset halt" -c "flash write_image erase nuttx.bin 0x08000000"
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* Start GDB with:
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$ arm-nuttx-eabi-gdb -tui nuttx
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* In GDB:
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(gdb) target remote localhost:3333
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(gdb) monitor reset halt
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(gdb) load
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Hardware
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========
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MCU Clocking
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------------
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By default, the MCU on this board is clocked from the MCU's internal HSI
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clock, and only this option is supported by software at this time.
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If software support is added for it, the MCU could be clocked from the
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following other sources: a 24 MHz oscillator on X2, MCO from STLINK-V3E, or
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external clock from connector CN9, pin 26.
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GPIOs
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-----
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Buttons
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-------
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The board has 5 user buttons in the form of a 4-direction "joystick" with a
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selection button (pressing down on the "joystick").
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LEDs
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----
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The board has 4 user LEDs.
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RGB Power LED
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-------------
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The board has a super bright RGB power LED.
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Caution: For eye safety, ensure that the power LED is covered by the
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diffuser that comes installed over it.
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Serial Consoles
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===============
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The MCU's USART3 is connected to the on-board STLINK-V3E and exposed to
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the PC as a Virtual COM Port over the same Micro-USB Type B connection used
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for programming/debugging.
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On Debian Linux, this shows up as /dev/ttyACM0. Other operating systems may
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differ.
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Configurations
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==============
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nsh
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---
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