Todos

How to capture arguments passed to a C program

```c
    // argc is the number of args passed
    // argc is always 1 or more
    // argc always has name/path of program as first arg
    int main(int argc, char *argv[]) {
    // do stuff with the args
    }
    ```

How to print argument value
```
```
    printf("%s", argv[1]);
    ```
```

Read a file

```c
    // open file in read mode. returns NULL if doesn't exist
    FILE *file_ptr = fread(file_path, "r");

    // seeking to end of file.
    // useful telling number of bytes
    fseek(file_ptr, 0, SEEK_END);

    // get number of bytes
    int num_of_bytes = ftell(file_ptr);

    // seek to begin of file
    fseek(file_ptr, 0, SEEK_SET);
    ```

Store contents of file in memory
Print file contents
Print instructions
Make sure program occupies correct space in chip memory
Parse individual instructions from binary CHIP-8 file
Print all instructions from CHIP-8 file
Write all CHIP-8 IBM logo opcodes to CSV file

Implement opcodes present in the IMB logo CHIP-8 file

x	Opcode	Type	Description
x	`00E0`	00E0	Clear display
x	`1nnn`	1nnn	Jump to address
x	`3xkk`	3xkk	Skip next if Vx == kk
x	`6xkk`	6xkk	Load register with immediate
x	`7xkk`	7xkk	Add immediate to Vx
x	`ANNN`	ANNN	Set index register
x	`Bnnn`	Bnnn	Jump to V0 + addr
x	`Dxyn`	Dxyn	Draw sprite

Refactor main
Migrate drawing to raylib window
Handle keyboard input

Implement remaining instructions

x	Opcode	Type	Description
x	`00EE`	00EE	Return from subroutine
x	`2nnn`	2nnn	Call subroutine at nnn
x	`4xkk`	4xkk	Skip next if Vx != kk
x	`5xy0`	5xy0	Skip next if Vx == Vy
x	`8xy0`	8xy0	Stores Vy in Vx
x	`8xy1`	8xy1	Set Vx = Vx OR Vy
x	`8xy2`	8xy2	Set Vx = Vx AND Vy
x	`8xy3`	8xy3	Set Vx = Vx XOR Vy
x	`8xy4`	8xy4	Set Vx = Vx + Vy, set VF = carry
x	`8xy5`	8xy5	Set Vx = Vx - Vy, set VF = NOT borrow
x	`8xy6`	8xy6	Set Vx = Vx SHR 1
x	`8xy7`	8xy7	Set Vx = Vy - Vx, set VF = NOT borrow
x	`8xyE`	8xyE	Set Vx = Vx SHL 1
	`9xy0`	9xy0	Skip next if Vx != Vy
x	`Cxkk`	Cxkk	Set Vx = random byte AND kk
	`Ex9E`	Ex9E	Skip next if key Vx is pressed
	`ExA1`	ExA1	Skip next if key Vx is not pressed
	`Fx07`	Fx07	Set Vx = delay timer value
	`Fx0A`	Fx0A	Wait for key press, store key in Vx
	`Fx15`	Fx15	Set delay timer = Vx
	`Fx18`	Fx18	Set sound timer = Vx
	`Fx1E`	Fx1E	Set I = I + Vx
	`Fx29`	Fx29	Set I = location of sprite for digit Vx
	`Fx33`	Fx33	Store BCD representation of Vx in memory
	`Fx55`	Fx55	Store registers V0 through Vx in memory starting at location I
	`Fx65`	Fx65	Read registers V0 through Vx from memory starting at location I
	`0nnn`	0nnn	Jump to machine code routine (ignored)

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Todos

4.5 KiB

Raw Blame History