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RISCV-Embedded

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Software and Projects for the RISC-V Embedded Group specifically the CH32V Microcontrollers

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# RISCV-Embedded

Bare metal C and C++ examples for the CH32V003F4P6 RISC-V microcontroller, built on the Rovari SDK.

Part of the [Rovari](https://rvembedded.com) platform.

## About

The CH32V003F4P6 is a 32-bit RISC-V microcontroller from WCH. QingKe V2A core, 48 MHz, 16 KB flash, 2 KB SRAM, under $0.10 in volume. Full peripheral set: UART, SPI, I2C, 10-bit ADC, timers, DMA, analog comparator.

Every example in this repository uses the Rovari SDK (`#include "rovari.h"`). Each one is provided in both C and C++ style. The C API uses standalone functions. The C++ API wraps the same hardware in lightweight objects (`Gpio`, `Pwm`, `Uart`, `Spi`, `I2c`, `Adc`, `Servo`, `Oled`). Both produce identical binary output.

## Examples

| # | Project | Description |
|---|---------|-------------|
| 00 | Blink | GPIO output, LED toggle |
| 01 | Dual LEDs | Source and sink current on a single pin |
| 02 | Pushbutton | Digital input with internal pull-up, debounced read |
| 03 | Millis | Non-blocking timing with millis() |
| 04 | Button Interrupt | Hardware interrupt on falling edge |
| 05 | PWM | LED fade using hardware PWM on TIM1 |
| 06 | Tone Gen | Musical note playback on a piezo buzzer |
| 07 | Sound Effects | Built-in sound library: beep, alarm, siren, melody |
| 08 | UART | Serial echo with uart_read_line() |
| 09 | ADC | Analog read with raw and millivolt output |
| 10 | Analog RW | Potentiometer controlling LED brightness via ADC and PWM |
| 11 | Smoothing | Running average filter on ADC readings |
| 12 | Calibration | Auto-calibrate sensor range, map to PWM output |
| 13 | Timer Interrupt | Periodic callback using timer_start() |
| 14 | Watchdog Timer | IWDG setup with optional feed |
| 15 | SPI | MCP41010 digital potentiometer over SPI |
| 16 | I2C | 24LC16B EEPROM write/read verification |
| 17 | DMA Mem2Mem | Memory to memory block copy via DMA |
| 18 | DMA ADC | Continuous ADC sampling into a buffer via DMA |
| 19 | Comparator | Analog comparator with UART output |
| 20 | Sine Wave | DMA-driven sine wave generation through PWM |
| 21 | Servo | Sweep and smooth S-curve servo motion |
| 22 | Servo Knob | Potentiometer controlling servo position |
| 23 | DC Motor | Bidirectional DC motor with speed ramp via L293D |
| 24 | Display | SSD1306 128x32 OLED over I2C |
| 25 | SD Card | Data logger writing CSV to microSD over SPI |

Each project folder contains `app.rova` (your code), `rovari.blocks` (Guvari visual blocks), `rovari.py` (Python companion script), and the full build output.

## Requirements

**Hardware:**
- CH32V003F4P6 board or bare chip on a breadboard
- WCH-LinkE programmer
- USB cable
- Components as listed in each example header

**Software:**
- [Rovari Studio](https://rvembedded.com/products/rovari-studio/) (bundled toolchain, drivers, and SDK)

## Build and Flash

1. Clone the repo:
    ```
    git clone https://github.com/ArmstrongSubero/RISCV-Embedded.git
    ```

2. Open Rovari Studio, select CH32V003 as target, open the project folder.

3. Press Run. The IDE compiles, links, and flashes in one step.

## Project Structure

```
00_Blink/
    app.rova            # Your C/C++ source
    rovari.blocks       # Guvari visual block file
    rovari.py           # Python companion script
    data/config.json    # Peripheral and library config
    src/                # Interrupt handlers
    system/             # Linker script, startup, build output
```

## Arduino Migration

If you are coming from Arduino, see the [Arduino to RISC-V migration guide](https://rvembedded.com/guides/arduino-migration/) on the website.

## Legacy Examples

The `Legacy` folder contains the original bare metal examples written directly against the WCH standard peripheral library without the Rovari SDK. These are currently depreciated.

## License

Apache License 2.0. See [LICENSE](LICENSE).

## Contact

- Website: [rvembedded.com](https://rvembedded.com)
- GitHub: [ArmstrongSubero](https://github.com/ArmstrongSubero)
- Email: armstrongsubero@gmail.com

RISCV-Embedded

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