From 89d8c08cd17304661a0cfa5bd68347652945f61f Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Fri, 21 Oct 2022 05:12:44 -0300
Subject: [PATCH] chore: implement apu u16 reads

---
 src/apu.zig    |  2 +-
 src/bus/io.zig | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/apu.zig b/src/apu.zig
index 5c5334e..ea9148a 100644
--- a/src/apu.zig
+++ b/src/apu.zig
@@ -24,7 +24,7 @@ pub const Apu = struct {
     chB: DmaSound(.B),
 
     bias: io.SoundBias,
-    /// NR51
+    /// NR50, NR51
     psg_cnt: io.ChannelVolumeControl,
     dma_cnt: io.DmaSoundControl,
     cnt: io.SoundControl,
diff --git a/src/bus/io.zig b/src/bus/io.zig
index 019c59d..c817a7d 100644
--- a/src/bus/io.zig
+++ b/src/bus/io.zig
@@ -83,6 +83,16 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
             0x0400_004C => unimplementedRead("Read {} from MOSAIC", .{T}),
 
             // Sound
+            0x0400_0060 => bus.apu.ch1.sweep.raw,
+            0x0400_0062 => @as(u16, bus.apu.ch1.envelope.raw) << 8 | bus.apu.ch1.duty.raw,
+            0x0400_0064 => bus.apu.ch1.freq.raw,
+            0x0400_0068 => @as(u16, bus.apu.ch2.envelope.raw) << 8 | bus.apu.ch2.duty.raw,
+            0x0400_006C => bus.apu.ch2.freq.raw,
+            0x0400_0070 => bus.apu.ch3.select.raw,
+            0x0400_0074 => bus.apu.ch3.freq.raw,
+            0x0400_0078 => @as(u16, bus.apu.ch4.envelope.raw) << 8 | bus.apu.ch4.len,
+            0x0400_007C => @as(u16, bus.apu.ch4.poly.raw) << 8 | bus.apu.ch4.cnt.raw,
+            0x0400_0080 => bus.apu.dma_cnt.raw,
             0x0400_0088 => bus.apu.bias.raw,
 
             // DMA Transfers