71 lines
2.1 KiB
Rust
71 lines
2.1 KiB
Rust
//! USB device discovery for DongLoRa dongles.
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//!
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//! Finds the serial port by matching USB VID:PID using the `serialport` crate.
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use std::thread;
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use std::time::Duration;
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use tracing::info;
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/// DongLoRa USB Vendor ID.
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pub const USB_VID: u16 = 0x1209;
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/// DongLoRa USB Product ID.
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pub const USB_PID: u16 = 0x5741;
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/// Known USB-UART bridge VID:PIDs found on some board revisions.
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const BRIDGE_VID_PIDS: &[(u16, u16)] = &[
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(0x10C4, 0xEA60), // CP2102 (Silicon Labs)
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(0x1A86, 0x55D4), // CH9102
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(0x1A86, 0x7523), // CH340
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(0x0403, 0x6001), // FT232R (FTDI)
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];
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/// Find the DongLoRa serial port by USB VID:PID.
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///
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/// Checks for native USB CDC-ACM first (VID:PID 1209:5741), then falls
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/// back to known USB-UART bridge chips found on some board revisions.
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/// Returns the first matching port path, or `None` if no device is found.
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pub fn find_port() -> Option<String> {
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let ports = serialport::available_ports().ok()?;
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// Prefer native USB (our custom VID:PID)
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if let Some(port) = ports.iter().find(|p| {
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matches!(
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&p.port_type,
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serialport::SerialPortType::UsbPort(info)
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if info.vid == USB_VID && info.pid == USB_PID
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)
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}) {
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return Some(port.port_name.clone());
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}
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// Fall back to known USB-UART bridge chips
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ports
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.into_iter()
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.find(|p| {
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matches!(
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&p.port_type,
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serialport::SerialPortType::UsbPort(info)
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if BRIDGE_VID_PIDS.contains(&(info.vid, info.pid))
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)
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})
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.map(|p| p.port_name)
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}
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/// Block until a DongLoRa device appears on USB.
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///
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/// Polls [`find_port`] every 500ms and returns the port path once found.
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pub fn wait_for_device() -> String {
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info!("waiting for DongLoRa device...");
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loop {
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if let Some(port) = find_port() {
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info!("found device at {port}");
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// Brief delay for USB enumeration to settle
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thread::sleep(Duration::from_millis(300));
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return port;
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}
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thread::sleep(Duration::from_millis(500));
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}
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}
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