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readme
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Readme.md
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Some working code examples for STM32
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# Repository Overview
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====================================
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Built without any third-party library.
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The `stm32samples` repository is a collection of low-level, bare-metal code examples and complete
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projects for various STM32 microcontroller series (F0, F1, F3, F4, G0). It uses CMSIS header files
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from `modm-io/cmsis-header-stm32` for register definitions.
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Supported F0, F1, F3, F4 and G0 series.
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## Project Structure by MCU Series
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### STM32F0 (F030, F042, F072)
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- **3steppersLB** – Controls 3 stepper motors with encoders via USB/CAN bus
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- **blink** – Simple LED toggling
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- **CANbus4BTA** – CAN replacement for PEP-CAN
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- **CANBUS_SSI** – Works with BTA SSI azimuth encoder
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- **Chiller** – Basic chiller temperature controller
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- **F0_testbrd** – Tests STM32F0x2 on custom board
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- **htu21d_nucleo** – Reads HTU-21D sensor on Nucleo-F042K
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- **morze** – Echoes USART1 data as Morse code on TIM3CH1 (PA6)
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- **NUCLEO_SPI** – SSI over SPI on Nucleo-F042K
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- **PL2303_ringbuffer** – USB CDC ACM with ring buffers
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- **QuadEncoder** – Quadrature encoder via timer
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- **Servo** – Controls SG-90 style servos
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- **Socket_fans** – Manages multiple fans
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- **TM1637** – Drives 7‑segment displays
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- **tsys01_nucleo** – Reads two TSYS01 sensors
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- **uart_blink & uart_blink_dma** – USART echo with DMA
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- **usbcan_relay** – Relay board over CAN bus
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- **usbcan_ringbuffer** – USB‑CAN adapter with ring buffers
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- **USBHID** – USB HID keyboard + mouse
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CMSIS-headers:
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### STM32F1 (F103)
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https://github.com/modm-io/cmsis-header-stm32
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- **BMP180, BMP280** – I²C temperature/pressure sensors
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- **Canon_managing_device** – Controls Canon lenses
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- **canUART** – UART‑CAN bridge
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- **DHT22_DHT11** – Humidity sensors using timer+DMA
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- **DS18** – DS18x20 temperature sensors
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- **F1_testbrd** – Test board for LQFP48 packages
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- **I2Cscan** – I²C scanner with register R/W
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- **LED_Screen** – Drives 32×16 LED matrices (P10)
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- **MAX7219_screen** – Controls 8×8 LED matrices
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- **RGB_LED_Screen** – HUB75E RGB panel with 8.8.4 color
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- **SevenCDCs** – Seven USB‑CDC ACM instances on one MCU (joke project)
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- **shutter** – Bistable shutter via USB/external signal
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- **Tetris** – Tetris on HUB75E panel
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- **USB_HID** – USB HID mouse+keyboard
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- **ws2815** – Rainbow effect on WS2815 strips
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### STM32F3 (F303)
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- **ADC** – Works with ADC peripheral
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- **blink** – Toggles LEDs on PB0/PB1
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- **CANusb** – USB‑CAN adapter
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- **floatPrintf** – Converts floats to strings
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- **Multistepper** – Controls up to 64 multiplexed steppers
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- **NitrogenFlooding** – Automatic nitrogen flooding
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- **PL2303** – PL2303 emulator (old)
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- **Seven_CDCs** – Seven USB CDC ACM interfaces
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- **usart1fullDMA** – USART1 Rx/Tx DMA with match detection
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- **USB_template_CDC** – USB‑CDC template
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### STM32F4 (F401)
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- **blink** – Simple LED toggling
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### STM32G0 (G070, G0B1)
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- **blink** – Basic LED blink
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- **RTC** – Real‑time clock
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- **flash** – Flash memory operations
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- **g0b1** – USB‑CDC working on G0B1
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- **i2c** – I²C operations
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- **usart** – USART communication
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### Other Directories
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- **deprecated** – Archive of older, no‑longer‑maintained code
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- **snippets** – Small reusable code fragments
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- **testboard** – KiCad 8 design files
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## Development Environment
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- **Toolchain**: arm-none-eabi‑gcc with `-flto` optimisations
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- **Build**: Structured Makefiles per series
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- **Debug**: OpenOCD configuration files provided
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- **Libraries**: No third‑party libraries; only CMSIS‑SVD headers
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## Project Maturity
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- **Alpha**: USB template for F303, MLX90640 all‑sky camera
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- **Stable**: LED blink, UART echo, sensor interfaces, USB‑CDC
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- **Draft**: CANbus4BTA, MLX90640multi
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- **Deprecated**: Older code in `deprecated/`
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## Summary
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This repository is a valuable resource for learning low‑level STM32 programming without vendor
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libraries. It covers practical applications:
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- **Industrial control**: Stepper motors, CAN bus, relay boards
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- **Sensor interfacing**: Temperature, pressure, humidity, encoders
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- **Human‑machine interfaces**: LED matrices, 7‑segment displays, USB HID
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- **Communication**: UART, SPI, I²C, USB‑CDC, USB‑HID, CAN
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- **Prototyping**: Test boards for F0, F1, F3, G0
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For the latest updates, check the repository on GitHub.
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## License
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This repository is provided under the GNU General Public License v3 or later.
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Full text of the GPLv3 is available at <https://www.gnu.org/licenses/gpl-3.0.html>.
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