From 1a86cc7ee5d9035a3eecce09863e6c1bc09bbb04 Mon Sep 17 00:00:00 2001
From: icex2 <djh.icex2@gmail.com>
Date: Sun, 11 Jun 2023 17:10:38 +0200
Subject: [PATCH] feat(p3io/ddr): Add data structures for DDR P3IO data

Reverse engineered using a real P3IO DDR IO board and
the DDR 16 game binary for additional reference
---
 src/main/p3io/ddr.h | 81 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/main/p3io/ddr.h

diff --git a/src/main/p3io/ddr.h b/src/main/p3io/ddr.h
new file mode 100644
index 0000000..85c1693
--- /dev/null
+++ b/src/main/p3io/ddr.h
@@ -0,0 +1,81 @@
+#ifndef P3IO_DDR_H
+#define P3IO_DDR_H
+
+#include <stdint.h>
+
+#pragma pack(push, 1)
+
+struct p3io_ddr_player {
+    uint8_t menu_start : 1;
+    uint8_t pad_up : 1;
+    uint8_t pad_down : 1;
+    uint8_t pad_left : 1;
+    uint8_t pad_right : 1;
+    uint8_t unknown : 1;
+    uint8_t menu_left : 1;
+    uint8_t menu_right : 1;
+};
+
+struct p3io_ddr_operator {
+    // Yes, this also contains the HD cab menu up and down buttons
+    // which are not "operator" inputs. I suppose they just had to go
+    // somewhere ¯\_(ツ)_/¯
+    uint8_t p1_menu_up : 1;
+    uint8_t p1_menu_down : 1;
+    uint8_t p2_menu_up : 1;
+    uint8_t p2_menu_down : 1;
+    uint8_t test : 1;
+    uint8_t coin : 1;
+    uint8_t service : 1;
+    uint8_t unknown : 1;
+};
+
+struct p3io_ddr_jamma {
+    uint8_t unknown_80;
+
+    struct p3io_ddr_player p1;
+    struct p3io_ddr_player p2;
+    struct p3io_ddr_operator operator;
+
+    uint32_t unused;
+    uint32_t unused2;
+};
+
+struct p3io_ddr_cabinet_light {
+    uint8_t p1_menu_buttons : 1;
+    uint8_t p2_menu_buttons : 1;
+    uint8_t unknown : 2;
+    uint8_t top_p1_lower : 1;
+    uint8_t top_p1_upper : 1;
+    uint8_t top_p2_lower : 1;
+    uint8_t top_p2_upper : 1;
+};
+
+struct p3io_ddr_output {
+    uint8_t unused_00[3];
+    struct p3io_ddr_cabinet_light cabinet;
+};
+
+_Static_assert(
+    sizeof(struct p3io_ddr_player) == 1,
+    "struct p3io_ddr_player is the wrong size");
+
+_Static_assert(
+    sizeof(struct p3io_ddr_operator) == 1,
+    "struct p3io_ddr_operator is the wrong size");
+
+_Static_assert(
+    sizeof(struct p3io_ddr_jamma) == sizeof(uint32_t) * 3,
+    "struct p3io_ddr_jamma is the wrong size");
+
+_Static_assert(
+    sizeof(struct p3io_ddr_cabinet_light) == 1,
+    "struct p3io_ddr_cabinet_light is the wrong size");
+
+_Static_assert(
+    sizeof(struct p3io_ddr_output) == sizeof(uint32_t),
+    "struct p3io_ddr_output is the wrong size");
+
+#pragma pack(pop)
+
+#endif
\ No newline at end of file