uart-devices

import asyncio import logging import os from uart_devices import UARTDevice logging.basicConfig(level=logging.INFO) # Set UART_DEVICE_PORT environment variable before running, e.g.: # export UART_DEVICE_PORT=/dev/ttyUSB0 # For demonstration, we use a common default like /dev/ttyS0 if not set. # Ensure this port exists and you have permissions. UART_PORT = os.environ.get("UART_DEVICE_PORT", "/dev/ttyS0") class MySimpleUARTDevice(UARTDevice): port = UART_PORT baudrate = 115200 # Common baud rate async def _async_on_open(self) -> None: logging.info(f"UART device {self.port} opened successfully.") async def _async_on_close(self) -> None: logging.info(f"UART device {self.port} closed.") async def _async_read_data(self, data: bytes) -> None: """Called when data is received.""" logging.info(f"Received data: {data.hex()}") async def main(): device = MySimpleUARTDevice() print(f"Attempting to interact with UART device on port: {device.port}...") try: await device.open() # In a real application, you would perform async read/write operations here. # For this example, we just keep it open briefly and then close. await asyncio.sleep(0.5) await device.close() print(f"Successfully interacted with and closed device on {device.port}.") except Exception as e: logging.error(f"Failed to interact with UART device on {device.port}: {type(e).__name__}: {e}") print("\n--- Troubleshooting Tips ---") print("1. Check permissions: Ensure your user is in the 'dialout' or 'uucp' group. (e.g., `sudo usermod -a -G dialout $USER` then log out and back in).") print("2. Verify device path: Ensure `UART_DEVICE_PORT` (e.g., /dev/ttyUSB0, /dev/ttyS0) is correct and the device is connected.") print("3. Check baud rate: Ensure 115200 matches your device's baud rate.") if __name__ == "__main__": asyncio.run(main())