103 lines
5.4 KiB
Markdown
103 lines
5.4 KiB
Markdown
# Todos
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- [x] How to capture arguments passed to a C program
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```c
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// argc is the number of args passed
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// argc is always 1 or more
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// argc always has name/path of program as first arg
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int main(int argc, char *argv[]) {
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// do stuff with the args
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}
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```
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- [x] How to print argument value
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```
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printf("%s", argv[1]);
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```
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- [x] Read a file
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```c
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// open file in read mode. returns NULL if doesn't exist
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FILE *file_ptr = fread(file_path, "r");
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// seeking to end of file.
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// useful telling number of bytes
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fseek(file_ptr, 0, SEEK_END);
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// get number of bytes
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int num_of_bytes = ftell(file_ptr);
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// seek to begin of file
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fseek(file_ptr, 0, SEEK_SET);
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```
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- [x] Store contents of file in memory
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- [x] Print file contents
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- [x] Print instructions
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- [x] Make sure program occupies correct space in chip memory
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- [x] Parse individual instructions from binary CHIP-8 file
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- [x] Print all instructions from CHIP-8 file
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- [x] Write all CHIP-8 IBM logo opcodes to CSV file
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- [x] Implement opcodes present in the IMB logo CHIP-8 file
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| x | Opcode | Type | Description |
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| --- | ------ | ---- | ---------------------------- |
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| x | `00E0` | 00E0 | Clear display |
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| x | `1nnn` | 1nnn | Jump to address |
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| x | `3xkk` | 3xkk | Skip next if Vx == kk |
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| x | `6xkk` | 6xkk | Load register with immediate |
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| x | `7xkk` | 7xkk | Add immediate to Vx |
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| x | `ANNN` | ANNN | Set index register |
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| x | `Bnnn` | Bnnn | Jump to V0 + addr |
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| x | `Dxyn` | Dxyn | Draw sprite |
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- [x] Refactor main
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- [x] Migrate drawing to raylib window
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- [x] Handle keyboard input
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CHIP-8 Pad QWERTY Keyboard
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┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐
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│ 1 │ 2 │ 3 │ C │ │ 1 │ 2 │ 3 │ 4 │
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├───┼───┼───┼───┤ ├───┼───┼───┼───┤
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│ 4 │ 5 │ 6 │ D │ ====> │ Q │ W │ E │ R │
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├───┼───┼───┼───┤ ├───┼───┼───┼───┤
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│ 7 │ 8 │ 9 │ E │ │ A │ S │ D │ F │
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├───┼───┼───┼───┤ ├───┼───┼───┼───┤
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│ A │ 0 │ B │ F │ │ Z │ X │ C │ V │
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└───┴───┴───┴───┘ └───┴───┴───┴───┘
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- [x] Implement remaining instructions
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| x | Opcode | Type | Description |
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| --- | ------ | ---- | --------------------------------------------------------------- |
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| x | `00EE` | 00EE | Return from subroutine |
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| x | `2nnn` | 2nnn | Call subroutine at nnn |
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| x | `4xkk` | 4xkk | Skip next if Vx != kk |
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| x | `5xy0` | 5xy0 | Skip next if Vx == Vy |
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| x | `8xy0` | 8xy0 | Stores Vy in Vx |
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| x | `8xy1` | 8xy1 | Set Vx = Vx OR Vy |
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| x | `8xy2` | 8xy2 | Set Vx = Vx AND Vy |
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| x | `8xy3` | 8xy3 | Set Vx = Vx XOR Vy |
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| x | `8xy4` | 8xy4 | Set Vx = Vx + Vy, set VF = carry |
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| x | `8xy5` | 8xy5 | Set Vx = Vx - Vy, set VF = NOT borrow |
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| x | `8xy6` | 8xy6 | Set Vx = Vx SHR 1 |
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| x | `8xy7` | 8xy7 | Set Vx = Vy - Vx, set VF = NOT borrow |
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| x | `8xyE` | 8xyE | Set Vx = Vx SHL 1 |
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| x | `9xy0` | 9xy0 | Skip next if Vx != Vy |
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| x | `Cxkk` | Cxkk | Set Vx = random byte AND kk |
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| x | `Ex9E` | Ex9E | Skip next if key Vx is pressed |
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| x | `ExA1` | ExA1 | Skip next if key Vx is not pressed |
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| x | `Fx07` | Fx07 | Set Vx = delay timer value |
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| x | `Fx0A` | Fx0A | Wait for key press, store key in Vx |
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| x | `Fx15` | Fx15 | Set delay timer = Vx |
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| x | `Fx18` | Fx18 | Set sound timer = Vx |
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| x | `Fx1E` | Fx1E | Set I = I + Vx |
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| x | `Fx29` | Fx29 | Set I = location of sprite for digit Vx |
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| x | `Fx33` | Fx33 | Store BCD representation of Vx in memory |
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| x | `Fx55` | Fx55 | Store registers V0 through Vx in memory starting at location I |
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| x | `Fx65` | Fx65 | Read registers V0 through Vx from memory starting at location I |
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| - | `0nnn` | 0nnn | Jump to machine code routine (ignored) |
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