Struct EpidSoftCallbackDeviceSupport 

pub struct EpidSoftCallbackDeviceSupport { /* private fields */ }

Async Soft Channel device support for the epid record.

Same PID algorithm as EpidSoftDeviceSupport, but with an asynchronous readback trigger via the TRIG link.

Processing flow:

1. First pass (triggered=false): Write TVAL to TRIG link via ProcessAction::WriteDbLink, and request a re-process via ProcessAction::ReprocessAfter(1ms). The TRIG write triggers the readback hardware to update the INP PV.
2. Second pass (triggered=true): INP has been updated by the triggered readback. Run PID with the fresh CVAL.

Ported from devEpidSoftCallback.c.

Implementations

impl EpidSoftCallbackDeviceSupport

pub fn new() -> Self

Trait Implementations

impl Default for EpidSoftCallbackDeviceSupport

fn default() -> Self

Returns the “default value” for a type.

impl DeviceSupport for EpidSoftCallbackDeviceSupport

fn dtyp(&self) -> &str

fn read(&mut self, record: &mut dyn Record) -> CaResult<DeviceReadOutcome>

Read from hardware into the record.

fn write(&mut self, _record: &mut dyn Record) -> CaResult<()>

fn init(&mut self, _record: &mut (dyn Record + 'static)) -> Result<(), CaError>

fn last_alarm(&self) -> Option<(u16, u16)>

Return the last alarm (status, severity) from the driver. None means the driver does not override alarms.

fn last_timestamp(&self) -> Option<SystemTime>

Return the last timestamp from the driver. None means the driver does not override timestamps.

fn set_record_info(&mut self, _name: &str, _scan: ScanType)

Called after init() with the record name and scan type.

fn io_intr_receiver(&mut self) -> Option<Receiver<()>>

Return a receiver for I/O Intr scan notifications. Only called for records with SCAN=I/O Intr.

fn write_begin( &mut self, _record: &mut (dyn Record + 'static), ) -> Result<Option<Box<dyn WriteCompletion>>, CaError>

Begin an asynchronous write (submit only, no blocking). Returns Some(handle) if the write was submitted to a worker queue — the caller should wait on the handle outside any record lock. Returns None to fall back to synchronous write().

fn handle_command( &mut self, _record: &mut (dyn Record + 'static), _command: &str, _args: &[EpicsValue], ) -> Result<(), CaError>

Handle a named command from the record’s process() via ProcessAction::DeviceCommand. This allows records to request driver operations (e.g., scaler reset/arm/write_preset) without holding a direct driver reference.