IO initial states are correct

include/serial.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <common.h>
+
+typedef struct {
+    u8 serial_data;
+    u8 serial_control;
+} serial_context;
+
+serial_context *serial_get_context();
+
+void serial_init();
+
+void serial_write(u16 address, u8 value);
+u8 serial_read(u16 address);

lib/audio.c

@@ -85,33 +85,34 @@ void audio_init(){
     memset(ctx.left_audio_buffer, 0, sizeof(float) * FRAMES_PER_BUFFER);
     memset(ctx.right_audio_buffer, 0, sizeof(float) * FRAMES_PER_BUFFER);
 
-    ctx.audio_enabled = false;
-    ctx.ch1_left = false;
-    ctx.ch1_right = false;
-    ctx.ch2_left = false;
-    ctx.ch2_right = false;
-    ctx.ch3_left = false;
+    ctx.audio_enabled = true;
+    ctx.ch1_left = true;
+    ctx.ch1_right = true;
+    ctx.ch2_left = true;
+    ctx.ch2_right = true;
+    ctx.ch3_left = true;
     ctx.ch3_right = false;
-    ctx.ch4_left = false;
+    ctx.ch4_left = true;
     ctx.ch4_right = false;
 
-    ctx.volume_left = 0x1;
-    ctx.volume_right = 0x1;
+    ctx.volume_left = 0x7;
+    ctx.volume_right = 0x7;
 
-    ctx.sq1_duty = 0x0;
-    ctx.sq1_volume = 0x0;
+    ctx.sq1_duty = 0x2;
+    ctx.sq1_volume = 0xF;
     ctx.sq1_sample = 0x0;
     ctx.sq1_period_reset = 0x0;
     ctx.sq1_period_timer = 0x0;
-    ctx.sq1_enable = false;
+    ctx.sq1_enable = true;
     ctx.sq1_len_enable = false;
     ctx.sq1_sweep_pace = 0x0;
     ctx.sq1_sweep_direction = false;
-    ctx.sq1_initial_len = 0x0;
+    ctx.sq1_initial_len = 0x3F;
     ctx.sq1_len = 0x0;
-    ctx.sq1_initial_volume = 0x0;
+    ctx.sq1_initial_volume = 0xF;
     ctx.sq1_env_direction = false;
-    ctx.sq1_env_pace = 0x0;
+    ctx.sq1_env_pace = 0x3;
+    ctx.sq1_env_pace_buffer = 0x3;
     ctx.sq1_env_timer = 0x0;
     ctx.sq1_sweep_step = 0x0;
 
@@ -122,7 +123,7 @@ void audio_init(){
     ctx.sq2_period_timer = 0x0;
     ctx.sq2_enable = false;
     ctx.sq2_len_enable = false;
-    ctx.sq2_initial_len = 0x0;
+    ctx.sq2_initial_len = 0x3F;
     ctx.sq2_len = 0x0;
     ctx.sq2_initial_volume = 0x0;
     ctx.sq2_env_direction = false;

lib/cpu.c

@@ -28,7 +28,7 @@ void cpu_init() {
     ctx.regs.sp = 0xFFFE;
     ctx.regs.pc = 0x100;
     ctx.ie_register = 0;
-    ctx.int_flags = 0;
+    ctx.int_flags = 0xE1;
     ctx.int_master_enabled = false;
     ctx.enabling_ime = false;
 

lib/emu.c

@@ -9,6 +9,7 @@
 #include <audio.h>
 #include <cart.h>
 #include <debug.h>
+#include <serial.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -69,6 +70,7 @@ void emu_reset() {
     cpu_init();
     audio_init();
     cart_init();
+    serial_init();
 }
 
 void emu_start() {

lib/io.c

@@ -5,19 +5,14 @@
 #include <lcd.h>
 #include <gamepad.h>
 #include <audio.h>
-
-static char serial_data[2];
+#include <serial.h>
 
 u8 io_read(u16 address){
     if(address == 0xFF00) {
         return gamepad_get_output();
     }
-    if(address == 0xFF01) {
-        return serial_data[0];
-    }
-
-    if(address == 0xFF02) {
-        return serial_data[1];
+    if(address == 0xFF01 || address == 0xFF02) {
+        return serial_read(address);
     }
 
     if(BETWEEN(address, 0xFF04, 0xFF07)){
@@ -46,14 +41,8 @@ void io_write(u16 address, u8 value){
         gamepad_set_sel(value);
         return;
     }
-    if(address == 0xFF01) {
-        serial_data[0] = value;
-        //printf("%c", value);
-        return;
-    }
-
-    if(address == 0xFF02) {
-        serial_data[1] = value;
+    if(address == 0xFF01 || address == 0xFF02) {
+        serial_write(address, value);
         return;
     }
 

lib/lcd.c

@@ -21,6 +21,7 @@ void lcd_init() {
     ctx.obj_palette[1] = 0xFF;
     ctx.win_x = 0;
     ctx.win_y = 0;
+    ctx.lcds = 0x80;
 
     for(int i = 0; i < 4; i++) {
         ctx.bg_colors[i] = colors_default[i];

lib/serial.c

@@ -0,0 +1,34 @@
+#include <serial.h>
+
+static serial_context ctx;
+
+serial_context *serial_get_context() {
+    return &ctx;
+};
+
+void serial_init() {
+    ctx.serial_control = 0x7E;
+    ctx.serial_data = 0;
+}
+
+void serial_write(u16 address, u8 value) {
+    if(address == 0xFF01) {
+        ctx.serial_data = value;
+        return;
+    }
+
+    if(address == 0xFF02) {
+        ctx.serial_control = value;
+        return;
+    }
+}
+
+u8 serial_read(u16 address) {
+    if(address == 0xFF01) {
+        return ctx.serial_data;
+    }
+
+    if(address == 0xFF02) {
+        return ctx.serial_control;
+    }
+}

lib/timer.c

@@ -34,6 +34,7 @@ void inc_tima() {
 
 void timer_init() {
     ctx.div = 0XAC00;
+    ctx.tac = 0xF8;
 }
 
 void timer_tick() {