Function pps_loop 

pub async fn pps_loop(
    resources: PpsResources,
    on_read: fn(&PpsReadings),
    get_setpoint: fn() -> PpsSetpoint,
)

Full PPS loop: 500ms ticker, 1500ms timeout, error counting (break after 10).

Expected behaviour on a bench / HIL rig without PPS hardware: the I2C probe at 0x35 NACKs on every cycle, error_count saturates within ~5 s, and the task logs:

[WARN ] PPS error: I2C master error: AcknowledgeCheckFailed(Unknown)   x10
[ERROR] stopping PPS task after 10 consecutive errors

Then the task exits cleanly. The board’s other tasks (BLE, LVGL, logger, serial_cmd, control loop) keep running. This is not a failure — during development and HIL testing the PPS module is absent, so the errors and the “stopping” log are expected and can be ignored. The check is there for production benches where a wedged PPS shouldn’t keep the I2C bus hot forever.