Function output_get

src/features.rs:791–850

(feature: &Feature)

// ─── Output Getter/Setter (0x2c) ────────────────────────────────────────────

fn output_get(feature: &Feature) -> f32 {
    debug!("Querying output device");

    let mut payload = [0u8; 65];
    payload[1] = 0x5a;
    payload[2] = 0x2c;
    payload[3] = 0x01;
    payload[4] = 0x01;

    DEVICE_CONNECTION
        .get()
        .expect("Device connection must be initialized")
        .lock()
        .unwrap()
        .write(&payload)
        .expect("Failed to send Query to Device");

    for attempt in 0..MAX_READ_ATTEMPTS {
        let Some(response) = read_packet() else {
            error!(
                "No response on attempt {}/{} for Output",
                attempt + 1,
                MAX_READ_ATTEMPTS
            );
            continue;
        };

        // expected: 5a 2c 05 01 [mode] ...
        if response[0] == 0x5a && response[1] == 0x2c {
            let value = match response[4] {
                0x02 => {
                    info!("Current output: Speakers");
                    0.0
                }
                0x04 => {
                    info!("Current output: Headphones");
                    1.0
                }
                other => {
                    error!("Unknown output mode: 0x{:02x}", other);
                    f32::NAN
                }
            };
            *feature.value.lock().unwrap() = value;
            return value;
        }

        debug!(
            "Discarded stale packet on attempt {}: {:02x?}",
            attempt + 1,
            &response[..12]
        );
    }

    error!(
        "No matching response after {} attempts for Output",
        MAX_READ_ATTEMPTS
    );