The chip8-emulator from cj1128

提交bug

在chip8.c里的指令集，比如250和251行，应该先比较写入VF后，再相减
因为VF是标记有没有借位，先相减后再比较，意义就完全错了

Hi, I wrote a simple chip8 emulator on a platform called lowres.nx and I'm trying to test it with your test roms. I got everything ok with test_opcode.ch8, but one error with BC_test.ch8 (Error "E05").
According to http://devernay.free.fr/hacks/chip8/C8TECH10.HTM#8xy5, this instruction is:

8xy5 - SUB Vx, Vy
Set Vx = Vx - Vy, set VF = NOT borrow.

If Vx > Vy, then VF is set to 1, otherwise 0. Then Vy is subtracted from Vx, and the results stored in Vx.

So after verification it seems that my code is ok ($FF - $EF does not borrow hence VF=1 => Error).

ReadFile是一个Win32 API的名字, 建议修改

参考: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
在交叉编译的时候会报错.

$ make
x86_64-w64-mingw32-gcc -Wall -c -std=c11 -I/home/origami/code/sdl_learn/mingw-sdk/x86_64-w64-mingw32/include  main.c -o main.o
main.c: In function ‘SDL_main’:
main.c:282:9: warning: implicit declaration of function ‘time’ [-Wimplicit-function-declaration]
  282 |   srand(time(0));
      |         ^~~~
x86_64-w64-mingw32-gcc -Wall -c -std=c11 -I/home/origami/code/sdl_learn/mingw-sdk/x86_64-w64-mingw32/include  chip8.c -o chip8.o
x86_64-w64-mingw32-gcc main.o chip8.o -L/opt/local/x86_64-w64-mingw32/lib -lmingw32 -L/home/origami/code/sdl_learn/mingw-sdk/x86_64-w64-mingw32/lib -lSDL2main -lSDL2 -lSDL2_image -mwindows -Wl,--no-undefined -Wl,--dynamicbase -Wl,--nxcompat -Wl,--high-entropy-va -lm -ldinput8 -ldxguid -ldxerr8 -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 -lshell32 -lsetupapi -lversion -luuid  -static-libgcc -static -o main.exe
/usr/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld: /usr/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/../lib/libkernel32.a(dpeqbs01169.o):(.text+0x0): multiple definition of `ReadFile'; main.o:main.c:(.text+0xaf): first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:25: main.exe] Error 1

使用的Makefile

# Cross build for windows from WSL. 

CXX = x86_64-w64-mingw32-gcc

SDL_ROOT = /home/origami/code/sdl_learn/mingw-sdk


SDL_INCLUDE = -I$(SDL_ROOT)/x86_64-w64-mingw32/include

CXXFLAGS = -Wall -c -std=c11 $(SDL_INCLUDE) 


SDL_LIB = -L$(SDL_ROOT)/x86_64-w64-mingw32/lib -lSDL2main -lSDL2 -lSDL2_image
MINGW_LIB = -L/opt/local/x86_64-w64-mingw32/lib -lmingw32
OTHER_LD_FLAGS = -mwindows -Wl,--no-undefined -Wl,--dynamicbase -Wl,--nxcompat -Wl,--high-entropy-va -lm -ldinput8 -ldxguid -ldxerr8 -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 -lshell32 -lsetupapi -lversion -luuid 

LDFLAGS = $(MINGW_LIB) $(SDL_LIB) $(OTHER_LD_FLAGS) -static-libgcc -static


EXE = main.exe

all: $(EXE)

$(EXE): main.o chip8.o
		$(CXX) main.o chip8.o $(LDFLAGS) -o $@

main.o: main.c
	$(CXX) $(CXXFLAGS) $< -o $@

chip8.o: chip8.c
	$(CXX) $(CXXFLAGS) $< -o $@

clean:
	rm *.o $(EXE)

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Error in test program

ReadFile是一个Win32 API的名字, 建议修改

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