Trait EarIn

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pub trait EarIn {
    // Required methods
    fn set_ear_in(&mut self, ear_in: bool, delta_fts: u32);
    fn feed_ear_in<I: Iterator<Item = NonZeroU32>>(
        &mut self,
        fts_deltas: I,
        max_frames_threshold: Option<usize>,
    );
    fn purge_ear_in_changes(&mut self, ear_in: bool);
    fn read_ear_in_count(&self) -> u32;

    // Provided methods
    fn read_ear_mode(&self) -> ReadEarMode { ... }
    fn set_read_ear_mode(&mut self, _mode: ReadEarMode) { ... }
}

Expand description

A trait for feeding the EAR line input.

Required Methods§

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fn set_ear_in(&mut self, ear_in: bool, delta_fts: u32)

Sets EAR IN bit state after the provided interval in ∆ T-states counted from the last recorded change.

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fn feed_ear_in<I: Iterator<Item = NonZeroU32>>( &mut self, fts_deltas: I, max_frames_threshold: Option<usize>, )

Feeds the EAR IN buffer with changes.

The provided iterator should yield time intervals measured in T-state ∆ differences after which the state of the EAR IN bit should be toggled.

max_frames_threshold may be optionally provided as a number of frames to limit the buffered changes. This is useful if the given iterator provides data largely exceeding the duration of a single frame.

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fn purge_ear_in_changes(&mut self, ear_in: bool)

Removes all buffered so far EAR IN changes.

Changes are usually consumed only when a call is made to crate::chip::ControlUnit::ensure_next_frame. Provide the current value of EAR IN bit as ear_in.

This may be useful when tape data is already buffered but the user decided to stop the tape playback immediately.

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