Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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[package]
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I/O: KISS the bus, attach a screen, plug in a controller
Chip-8 has no ROM, nor memory management.
- It's much easier to just use contiguous memory.
- Then we can return references to slices of that memory
- ~3x speed increase
Screen exists now, uses 24-bit framebuffer
- We have a 1-bit framebuffer
- I chose colors that look good to me
Controller exists as well, has 16 buttons
- Mapped "0 123 456 789 ab cdef" to (QWERTY) "X 123 QWE ASD zC 4RFV"
- Other chip-8 interpreters may use a different layout
- This is good enough for now.
- F1-F9 map to control functions
- F1, F2: Dump CPU registers/screen contents
- F3, F4: Toggle disassembly/pause
- F5: Single-step the CPU, pausing after
- F6, F7: Set/Unset breakpoint
- F8, F9: Soft/Hard Reset CPU
2023-03-22 20:03:53 +00:00
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name = "chirp"
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Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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version = "0.1.0"
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edition = "2021"
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2023-03-27 23:30:31 +00:00
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authors = ["John Breaux"]
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license = "MIT"
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Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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2023-03-27 22:23:41 +00:00
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[features]
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tests: Coverage and cleanup/speedup
- Improved test coverage to >80% of lines, functions
- When doctests are included.
- Wrote new unit tests:
- Explicit tests for invalid instructions in the
ranges {`5xyn`, `8xyn`, `9xyn`, `Fxbb`}
- `rand` Tests for 1052671 cycles, to ensure
randomly generated number is < ANDed byte
- `Ex9E` (sek), `ExA1`(snek) will press only the expected key,
then every key except the expected key, for every address
- `Fx0A` (waitk) asserts based on the waveform of a keypress.
After all, an A press is an A press.
- Improved test performance by printing slightly less
- Removed nightly requirement
- (now optional, with feature = "unstable")
- Amended justfile to test with `cargo nextest` (nice)
- Changed release builds to optlevel 3
2023-03-28 12:33:17 +00:00
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default = ["unstable"]
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unstable = []
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2023-03-30 04:37:12 +00:00
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iced = ["dep:iced"]
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2023-03-27 22:23:41 +00:00
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rhexdump = ["dep:rhexdump"]
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serde = ["dep:serde"]
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Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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2023-03-25 23:17:55 +00:00
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[profile.release]
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tests: Coverage and cleanup/speedup
- Improved test coverage to >80% of lines, functions
- When doctests are included.
- Wrote new unit tests:
- Explicit tests for invalid instructions in the
ranges {`5xyn`, `8xyn`, `9xyn`, `Fxbb`}
- `rand` Tests for 1052671 cycles, to ensure
randomly generated number is < ANDed byte
- `Ex9E` (sek), `ExA1`(snek) will press only the expected key,
then every key except the expected key, for every address
- `Fx0A` (waitk) asserts based on the waveform of a keypress.
After all, an A press is an A press.
- Improved test performance by printing slightly less
- Removed nightly requirement
- (now optional, with feature = "unstable")
- Amended justfile to test with `cargo nextest` (nice)
- Changed release builds to optlevel 3
2023-03-28 12:33:17 +00:00
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opt-level = 3
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2023-03-25 23:17:55 +00:00
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debug = false
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rpath = false
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lto = true
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debug-assertions = false
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codegen-units = 1
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panic = 'unwind'
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tests: Coverage and cleanup/speedup
- Improved test coverage to >80% of lines, functions
- When doctests are included.
- Wrote new unit tests:
- Explicit tests for invalid instructions in the
ranges {`5xyn`, `8xyn`, `9xyn`, `Fxbb`}
- `rand` Tests for 1052671 cycles, to ensure
randomly generated number is < ANDed byte
- `Ex9E` (sek), `ExA1`(snek) will press only the expected key,
then every key except the expected key, for every address
- `Fx0A` (waitk) asserts based on the waveform of a keypress.
After all, an A press is an A press.
- Improved test performance by printing slightly less
- Removed nightly requirement
- (now optional, with feature = "unstable")
- Amended justfile to test with `cargo nextest` (nice)
- Changed release builds to optlevel 3
2023-03-28 12:33:17 +00:00
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incremental = false
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2023-03-25 23:17:55 +00:00
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overflow-checks = false
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Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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[dependencies]
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2023-03-27 22:23:41 +00:00
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gumdrop = "^0.8.1"
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2023-03-30 04:37:12 +00:00
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iced = {version = "0.8.0", optional = true}
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2023-03-27 22:23:41 +00:00
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minifb = { version = "^0.24.0", features = ["wayland"] }
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Initial commit:
Created outline of emulator:
The emulator has a Bus, which attaches a CPU to some Memory (Mapped Devices)
The design isn't particularly efficient, but the interpreter only needs to
run at ~500Hz or so. It's Rust. It can do that.
Instructions yet to be implemented:
Cxbb: "Store a random number, masked by bitmask bb, into vX"
Dxyn: "Draw an 8 by n sprite to the screen at coordinates (x, y)"
Fx0A: "Wait for a key, then set vX to the value of the pressed key"
Fx33: "BCD convert X, storing the results in &I[0..3]"
Thoughts going forward:
- It's probably a good idea to parse instructions out into an enum.
I had this in an earlier design, but it didn't really look that good.
However, I haven't read many other emulators before, so I don't know the
style people generally go for.
- I haven't used a native graphics library before, and my cg class was done
entirely in a web browser. That kinda sucks, honestly. Sure the skill
might transfer well, but, >JS
2023-03-08 12:07:33 +00:00
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owo-colors = "^3"
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2023-03-27 22:23:41 +00:00
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rand = "^0.8.5"
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rhexdump = {version = "^0.1.1", optional = true }
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serde = { version = "^1.0", features = ["derive"], optional = true }
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thiserror = "^1.0.39"
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