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Add ensureStopped() before memory operations

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VICE stops emulation on first command and sends async events, but may
not process the command itself until fully stopped. This adds an
ensureStopped() mechanism that sends RegistersGet first to confirm
VICE is in stopped state before memory read/write operations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Simen Svale 2025-12-30 03:28:27 +01:00
parent a985c074a4
commit aacdf7bbb2
1 changed files with 28 additions and 0 deletions
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28
src/protocol/client.ts
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@ -350,6 +350,27 @@ export class ViceClient {
});
}
// Ensure VICE is in stopped state before operations that require it
// On first command after connect, VICE stops emulation and sends async events
// but may not process the command itself. Calling this first ensures VICE is ready.
private stoppedConfirmed = false;
private async ensureStopped(): Promise<void> {
if (this.stoppedConfirmed && !this.state.running) {
return; // Already confirmed stopped
}
// Send RegistersGet to trigger stop and wait for response
// This ensures VICE has fully stopped and is ready to process commands
debugLog("ensureStopped: sending RegistersGet to confirm stopped state");
const body = Buffer.alloc(1);
body[0] = MemorySpace.MainCPU;
await this.sendCommand(Command.RegistersGet, body, ResponseType.RegisterInfo);
this.stoppedConfirmed = true;
this.state.running = false;
debugLog("ensureStopped: VICE confirmed stopped");
}
// High-level commands
async readMemory(
@ -380,6 +401,9 @@ export class ViceClient {
);
}
// Ensure VICE is stopped before memory read
await this.ensureStopped();
// Build request per official VICE docs:
// side_effects(1) + start(2) + end(2) + memspace(1) + bankId(2) = 8 bytes
const body = Buffer.alloc(8);
@ -428,6 +452,9 @@ export class ViceClient {
);
}
// Ensure VICE is stopped before memory write
await this.ensureStopped();
// Build request: side_effects(1) + start(2) + memspace(1) + length-1(1) + data(N)
const body = Buffer.alloc(5 + dataBuffer.length);
body[0] = 0; // No side effects
@ -478,6 +505,7 @@ export class ViceClient {
// Exit command (0xaa) resumes execution
await this.sendCommand(Command.Exit);
this.state.running = true;
this.stoppedConfirmed = false; // Need to re-confirm stopped state after resume
}
async step(count = 1, stepOver = false): Promise<ViceResponse> {