Struct StepResult 

pub struct StepResult {
    pub dma: Option<Dma>,
    pub interrupt_change: Option<bool>,
    pub dp_write: Option<(u8, u32)>,
}

What one scalar step asked the rest of the machine to do.

The RSP cannot reach RDRAM or the MI itself — it does not own them — so it reports rather than acts, and rustyn64-core::Bus carries it out. This is the same shape the PI engine uses, and it is what lets the RSP be stepped in isolation.

Fields

dma: Option<Dma>

A transfer an MTC0 to a length register started.

interrupt_change: Option<bool>

A change to the MI’s SP interrupt line: Some(true) raises it, Some(false) acknowledges it, None leaves it alone.

Three states rather than two, because the RSP acknowledges its own interrupt by writing CLR_INTR through MTC0 — with a plain bool, “clear the line” and “this step said nothing about the line” are the same value, and the acknowledgment is silently dropped.

dp_write: Option<(u8, u32)>

An MTC0 to a DP command register (c8–c15), reported as a DPC word offset 0–7 (0=DP_START, 1=DP_END, 2=DP_CURRENT, 3=DP_STATUS, 4–7 the clock/busy counters) and the value.

Those COP0 registers are the RDP’s command registers, but the RSP crate may not depend on rustyn64-rdp (the crate graph forbids that chip→chip edge — docs/architecture.md). So the write is reported here and rustyn64-core::Bus forwards it to Rdp::dpc_write, exactly as dma and interrupt_change are carried out by the owner.

Trait Implementations

impl Clone for StepResult

fn clone(&self) -> StepResult

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StepResult

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StepResult

fn default() -> StepResult

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for StepResult

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for StepResult

fn eq(&self, other: &StepResult) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for StepResult

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for StepResult

impl Eq for StepResult

impl StructuralPartialEq for StepResult