#define COLOR_LIGHTBLUE 0x0E
#define COLOR_GRAY3 0x0F
+/* Masks for joy_read */
+#define JOY_UP_MASK 0x10
+#define JOY_DOWN_MASK 0x20
+#define JOY_LEFT_MASK 0x40
+#define JOY_RIGHT_MASK 0x80
+#define JOY_BTN_1_MASK 0x01
+#define JOY_BTN_2_MASK 0x02
+#define JOY_BTN_3_MASK 0x04
+#define JOY_BTN_4_MASK 0x08
+
+#define JOY_BTN_A_MASK JOY_BTN_1_MASK
+#define JOY_BTN_B_MASK JOY_BTN_2_MASK
+#define JOY_SELECT_MASK JOY_BTN_3_MASK
+#define JOY_START_MASK JOY_BTN_4_MASK
+
+#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
+#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
+#define JOY_SELECT(v) ((v) & JOY_SELECT_MASK)
+#define JOY_START(v) ((v) & JOY_START_MASK)
+
/* Return codes of get_tv */
#define TV_NTSC 0
#define TV_PAL 1
/* No support for dynamically loadable drivers */
#define DYN_DRV 0
-/* The joystick keys - all keys are supported */
-#define KEY_UP 0x10
-#define KEY_DOWN 0x20
-#define KEY_LEFT 0x40
-#define KEY_RIGHT 0x80
-#define KEY_A 0x1
-#define KEY_B 0x2
-#define KEY_SELECT 0x4
-#define KEY_START 0x8
-
+/* Define hardware */
+
+/* Picture Processing Unit */
+struct __ppu {
+ unsigned char control;
+ unsigned char mask; /* color; show sprites, background */
+ signed char volatile const status;
+ struct {
+ unsigned char address;
+ unsigned char data;
+ } sprite;
+ unsigned char scroll;
+ struct {
+ unsigned char address;
+ unsigned char data;
+ } vram;
+};
+#define PPU (*(struct __ppu*)0x2000)
+#define SPRITE_DMA (APU.sprite.dma)
+
+/* Audio Processing Unit */
+struct __apu {
+ struct {
+ unsigned char control; /* duty, counter halt, volume/envelope */
+ unsigned char ramp;
+ unsigned char period_low; /* timing */
+ unsigned char len_period_high; /* length, timing */
+ } pulse[2];
+ struct {
+ unsigned char counter; /* counter halt, linear counter */
+ unsigned char unused;
+ unsigned char period_low; /* timing */
+ unsigned char len_period_high; /* length, timing */
+ } triangle;
+ struct {
+ unsigned char control; /* counter halt, volume/envelope */
+ unsigned char unused;
+ unsigned char period; /* loop, timing */
+ unsigned char len; /* length */
+ } noise;
+ struct {
+ unsigned char control; /* IRQ, loop, rate */
+ unsigned char output; /* output value */
+ unsigned char address;
+ unsigned char length;
+ } delta_mod; /* delta pulse-code modulation */
+ struct {
+ unsigned char dma;
+ } sprite;
+ signed char volatile status;
+ unsigned char unused;
+ unsigned char fcontrol;
+};
+#define APU (*(struct __apu*)0x4000)
+
+#define JOYPAD ((unsigned char volatile[2])0x4016)
/* The addresses of the static drivers */
extern void nes_stdjoy_joy[]; /* Referred to by joy_static_stddrv[] */
-void waitvblank (void);
-/* Wait for the vertical blanking */
+void waitvsync (void);
+/* Wait for start of the next frame */
unsigned char get_tv (void);
/* Return the video mode the machine is using. */