audio is getting closer?

include/audio.h

@@ -3,13 +3,71 @@
 #include <common.h>
 
 typedef struct {
+
+    bool audio_enabled;
+    bool ch1_left;
+    bool ch1_right;
+    bool ch2_left;
+    bool ch2_right;
+    bool ch3_left;
+    bool ch3_right;
+    bool ch4_left;
+    bool ch4_right;
+
+    u8 volume_left;
+    u8 volume_right;
+
     float sq1_freq;
-    float sq1_duty;
-    float sq1_amp;
+    u8 sq1_duty;
+    u8 sq1_volume;
     float sq2_freq;
-    float sq2_duty;
-    float sq2_amp;
+    u8 sq2_duty;
+    u8 sq2_volume;
+
+    bool ready;
+    u8 sq1_sample;
+    float sq1_value;
+    u16 sq1_period_reset;
+    u16 sq1_period_timer;
+    bool sq1_enable;
+    bool sq1_len_enable;
+    u8 sq1_sweep_pace;
+    bool sq1_sweep_direction;
+    u8 sq1_initial_len;
+    u8 sq1_len;
+    u8 sq1_initial_volume;
+    bool sq1_env_direction;
+    u8 sq1_env_pace;
+    u8 sq1_env_timer;
+    u8 sq1_sweep_step;
+    u8 sq1_audio_buffer[4096];
+    u32 sq1_write_head;
+    u32 sq1_read_head;
+
+    u8 sq2_sample;
+    float sq2_value;
+    u16 sq2_period_reset;
+    u16 sq2_period_timer;
+    bool sq2_enable;
+    bool sq2_len_enable;
+    u8 sq2_sweep_pace;
+    bool sq2_sweep_direction;
+    u8 sq2_initial_len;
+    u8 sq2_len;
+    u8 sq2_initial_volume;
+    bool sq2_env_direction;
+    u8 sq2_env_pace;
+    u8 sq2_env_timer;
+    u8 sq2_sweep_step;
+    u8 sq2_audio_buffer[4096];
+    u32 sq2_write_head;
+    u32 sq2_read_head;
+
 } audio_context;
 
 void audio_init();
-void audio_tick();
+void audio_tick();
+void audio_period_tick();
+
+u8 audio_read(u16 address);
+void audio_write(u16 address, u8 value);