From c2c45b45f981e557838943c6f24329c51b1adb4b Mon Sep 17 00:00:00 2001
From: Daniel Jones <admin@danieljon.es>
Date: Sun, 30 Aug 2020 16:17:45 +0930
Subject: move timers to a function

---
 chip8.c | 13 ++++++++-----
 chip8.h |  2 ++
 main.c  | 28 +++++-----------------------
 3 files changed, 15 insertions(+), 28 deletions(-)

diff --git a/chip8.c b/chip8.c
index 1e7a857..f181494 100644
--- a/chip8.c
+++ b/chip8.c
@@ -129,7 +129,8 @@ void
 chip8_beep()
 {
 	// TODO: holy shit this is terrible, do something better
-	puts("\a");
+	printf("\a");
+	fflush(stdout);
 }
 
 void
@@ -157,7 +158,7 @@ chip8_cycle()
 	uint8_t x = (opcode >> 8) & 0x000F;	// lower 4 bits of the high byte, we discard the low byte by right shifting it out
 	uint8_t y = (opcode >> 4) & 0x000F;	// upper 4 bits of the low byte, so we need to discard the lower 4 bits
 	uint8_t kk = opcode & 0x00FF;		// lowest 8 bits
-	printf("parsing at 0x%03X opcode = 0x%04X\n", PC, opcode);
+	//printf("parsing at 0x%03X opcode = 0x%04X\n", PC, opcode);
 	PC += 2; // TODO: remove
 	switch (opcode & 0xF000)
 	{
@@ -170,7 +171,6 @@ chip8_cycle()
 		switch (kk)
 		{
 		case 0x00E0: /* cls (clear screen) */
-			puts("clear");
 			memset(video, 0, (WIDTH*HEIGHT) * sizeof(uint32_t));
 			draw_flag = 1;
 			break;
@@ -351,7 +351,7 @@ chip8_cycle()
 			// TODO: not tested
 			for(int i = 0; i <= x; ++i)
 			{
-			    memory[I + i] = V[i];
+				memory[I + i] = V[i];
 			}
 			break;
 		}
@@ -360,7 +360,7 @@ chip8_cycle()
 			// TODO: not tested
 			for(int i = 0; i <= x; ++i)
 			{
-			    V[i] = memory[I + i];
+				V[i] = memory[I + i];
 			}
 			break;
 		}
@@ -372,7 +372,10 @@ chip8_cycle()
 	}
 	default: unknown_opcode(opcode);
 	}
+}
 
+void chip8_timer_cycle()
+{
 	/* timers */
 	if (delay_timer > 0)
 		delay_timer--;
diff --git a/chip8.h b/chip8.h
index d19f439..287dacc 100644
--- a/chip8.h
+++ b/chip8.h
@@ -35,6 +35,7 @@
 #define FONT_BYTE_SIZE 80
 #define BYTE_MASK 0x80
 #define PIXEL_COLOR 0xFFFFFF
+#define TIMER_FREQUENCY 60
 
 int load_rom();
 void chip8_init();
@@ -42,5 +43,6 @@ void chip8_draw_sprite(int startx, int starty, uint16_t mem, uint8_t size);
 void chip8_cycle();
 void chip8_beep();
 void unknown_opcode(uint16_t bad_opcode);
+void chip8_timer_cycle();
 
 #endif
diff --git a/main.c b/main.c
index 0b7eb83..44a7bfc 100644
--- a/main.c
+++ b/main.c
@@ -29,7 +29,6 @@
  */
 
 //#define VIDEO_SCALE 5
-#define STEPPING 0 // set to 1 to step manually through program
 
 SDL_Window *window;
 SDL_Renderer *renderer;
@@ -236,30 +235,13 @@ int main(int argc, char *argv[])
 
 		// logic
 		do_quit = handle_sdl_events();
-		if (STEPPING)
-		{
-			if (step_cycle == 1)
-			{
-				chip8_cycle();
+		chip8_cycle();
+		chip8_timer_cycle();
 
-				if (draw_flag)
-				{
-					update_video();
-					draw_flag = 0;
-				}
-
-				step_cycle = 0;
-			}
-		}
-		else
+		if (draw_flag)
 		{
-			chip8_cycle();
-
-			if (draw_flag)
-			{
-				update_video();
-				draw_flag = 0;
-			}
+			update_video();
+			draw_flag = 0;
 		}
 
 		frame_time = SDL_GetTicks() - frame_start;
-- 
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