through sub_8009414

asm/link.s

@@ -5,141 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_80093CC
-sub_80093CC: @ 80093CC
-	push {lr}
-	bl sub_800B488
-	bl sub_800E700
-	bl sub_800BEC0
-	ldr r1, =0x00008001
-	cmp r0, r1
-	beq _080093F4
-	bl sub_800B4A4
-	bl sub_80097E8
-	bl RestoreSerialTimer3IntrHandlers
-	movs r0, 0
-	b _080093FE
-	.pool
-_080093F4:
-	bl rfu_REQ_stopMode
-	bl rfu_waitREQComplete
-	movs r0, 0x1
-_080093FE:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_80093CC
-
-	thumb_func_start sub_8009404
-sub_8009404: @ 8009404
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	bl DestroyTask
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8009404
-
-	thumb_func_start sub_8009414
-sub_8009414: @ 8009414
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	adds r5, r0, 0
-	ldr r4, [sp, 0x18]
-	lsls r5, 24
-	lsrs r5, 24
-	lsls r1, 24
-	lsrs r1, 24
-	mov r8, r1
-	lsls r2, 24
-	lsrs r6, r2, 24
-	lsls r3, 24
-	lsrs r7, r3, 24
-	lsls r4, 16
-	lsrs r4, 16
-	ldr r0, =gLinkTestDigitsPal
-	lsls r1, r5, 4
-	movs r2, 0x20
-	bl LoadPalette
-	ldr r3, =0x040000d4
-	ldr r0, =gLinkTestDigitsGfx
-	str r0, [r3]
-	lsls r2, r7, 14
-	lsls r0, r4, 5
-	movs r1, 0xC0
-	lsls r1, 19
-	adds r0, r1
-	adds r2, r0
-	str r2, [r3, 0x4]
-	ldr r0, =0x80000110
-	str r0, [r3, 0x8]
-	ldr r0, [r3, 0x8]
-	ldr r0, =gUnknown_03003130
-	str r6, [r0]
-	str r5, [r0, 0x4]
-	str r4, [r0, 0x8]
-	mov r0, r8
-	cmp r0, 0x2
-	beq _0800949E
-	cmp r0, 0x2
-	bgt _08009484
-	cmp r0, 0x1
-	beq _0800948C
-	b _080094C0
-	.pool
-_08009484:
-	mov r0, r8
-	cmp r0, 0x3
-	beq _080094B0
-	b _080094C0
-_0800948C:
-	lsls r1, r6, 8
-	movs r0, 0x1
-	orrs r1, r0
-	lsls r0, r7, 2
-	orrs r1, r0
-	movs r0, 0xA
-	bl SetGpuReg
-	b _080094C0
-_0800949E:
-	lsls r1, r6, 8
-	movs r0, 0x1
-	orrs r1, r0
-	lsls r0, r7, 2
-	orrs r1, r0
-	movs r0, 0xC
-	bl SetGpuReg
-	b _080094C0
-_080094B0:
-	lsls r1, r6, 8
-	movs r0, 0x1
-	orrs r1, r0
-	lsls r0, r7, 2
-	orrs r1, r0
-	movs r0, 0xE
-	bl SetGpuReg
-_080094C0:
-	mov r0, r8
-	lsls r4, r0, 2
-	adds r0, r4, 0
-	adds r0, 0x10
-	lsls r0, 24
-	lsrs r0, 24
-	movs r1, 0
-	bl SetGpuReg
-	adds r4, 0x12
-	lsls r4, 24
-	lsrs r4, 24
-	adds r0, r4, 0
-	movs r1, 0
-	bl SetGpuReg
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8009414
-
 	thumb_func_start sub_80094EC
 sub_80094EC: @ 80094EC
 	push {r4-r6,lr}

common_syms/link.txt

@@ -0,0 +1 @@
+gUnknown_03003130

data/link.s

@@ -5,22 +5,6 @@
 
 	.section .rodata
 
-	.align 2
-gWirelessLinkDisplayPal:: @ 82EC86C
-	.incbin "graphics/interface/wireless_link_display.gbapal"
-
-gWirelessLinkDisplayGfx:: @ 82EC88C
-	.incbin "graphics/interface/wireless_link_display.4bpp.lz"
-
-gWirelessLinkDisplayTilemap:: @ 82ECD34
-	.incbin "graphics/interface/wireless_link_display.bin.lz"
-
-gLinkTestDigitsPal:: @ 82ECF20
-	.incbin "graphics/interface/link_test_digits.gbapal"
-
-gLinkTestDigitsGfx:: @ 82ECF40
-	.incbin "graphics/interface/link_test_digits.4bpp"
-
 	.string "{HIGHLIGHT TRANSPARENT}{COLOR WHITE}$"
 
 	.align 2

include/gba/io_reg.h

@@ -584,6 +584,23 @@
 #define TIMER_INTR_ENABLE 0x40
 #define TIMER_ENABLE      0x80
 
+// BGCNT
+#define BGCNT_PRIORITY(n)          (n) // Values 0 - 3. Lower priority BGs will be drawn on top of higher priority BGs.
+#define BGCNT_CHARBASE(n)   ((n) << 2) // Values 0 - 3. Base block for tile pixel data.
+#define BGCNT_MOSAIC            0x0040
+#define BGCNT_16COLOR           0x0000 // 4 bits per pixel
+#define BGCNT_256COLOR          0x0080 // 8 bits per pixel
+#define BGCNT_SCREENBASE(n) ((n) << 8) // Values 0 - 31. Base block for tile map.
+#define BGCNT_WRAP              0x2000 // Only affects affine BGs. Text BGs wrap by default.
+#define BGCNT_TXT256x256        0x0000 // Internal screen size size of text mode BG in pixels.
+#define BGCNT_TXT512x256        0x4000
+#define BGCNT_TXT256x512        0x8000
+#define BGCNT_TXT512x512        0xC000
+#define BGCNT_AFF128x128        0x0000 // Internal screen size size of affine mode BG in pixels.
+#define BGCNT_AFF256x256        0x4000
+#define BGCNT_AFF512x512        0x8000
+#define BGCNT_AFF1024x1024      0xC000
+
 // serial
 #define SIO_ID             0x0030 // Communication ID
 

include/librfu.h

@@ -106,3 +106,5 @@ struct RfuIntrStruct
 extern struct RfuStruct *gRfuState;
 
 void STWI_init_all(struct RfuIntrStruct *interruptStruct, IntrFunc *interrupt, bool8 copyInterruptToRam);
+void rfu_REQ_stopMode(void);
+void rfu_waitREQComplete(void);

include/link.h

@@ -193,4 +193,8 @@ u8 sub_800ABAC(void);
 u8 sub_800ABBC(void);
 void sub_800AC34(void);
 
+void sub_80097E8(void);
+
+extern IWRAM_DATA u32 gUnknown_03003130[3]; // common
+
 #endif // GUARD_LINK_H

include/main.h

@@ -60,5 +60,6 @@ void SetSerialCallback(IntrCallback callback);
 void InitFlashTimer(void);
 void DoSoftReset(void);
 void ClearPokemonCrySongs(void);
+void RestoreSerialTimer3IntrHandlers(void);
 
 #endif // GUARD_MAIN_H

ld_script.txt

@@ -51,6 +51,7 @@ SECTIONS {
         src/text.o(.text);
         src/sprite.o(.text);
         src/string_util.o(.text);
+        src/link.o(.text);
         asm/link.o(.text);
         src/rtc.o(.text);
         asm/main_menu.o(.text);
@@ -327,6 +328,7 @@ SECTIONS {
         src/sprite.o(.rodata);
         data/io_reg.o(.rodata);
         src/string_util.o(.rodata);
+        src/link.o(.rodata);
         data/link.o(.rodata);
         src/rtc.o(.rodata);
         data/main_menu.o(.rodata);

src/link.c

@@ -1,6 +1,11 @@
 
 // Includes
 #include "global.h"
+#include "librfu.h"
+#include "gpu_regs.h"
+#include "palette.h"
+#include "task.h"
+#include "link.h"
 
 // Static type declarations
 
@@ -31,17 +36,17 @@ IWRAM_DATA u32 gUnknown_03000D54;
 IWRAM_DATA u8 gUnknown_03000D58;
 IWRAM_DATA u32 gUnknown_03000D5C;
 IWRAM_DATA u32 gUnknown_03000D60;
-IWRAM_DATA u8 gUnknown_03000D64[4]; // not really, but won't match otherwise
+IWRAM_DATA u8 gUnknown_03000D64;
-IWRAM_DATA u8 gUnknown_03000D68[4];
+ALIGNED() IWRAM_DATA u8 gUnknown_03000D68[4];
 IWRAM_DATA u8 gUnknown_03000D6C;
 IWRAM_DATA bool8 gUnknown_03000D6D;
 IWRAM_DATA u16 gUnknown_03000D6E;
 IWRAM_DATA u16 gUnknown_03000D70;
 IWRAM_DATA u8 gUnknown_03000D72;
 IWRAM_DATA u8 gUnknown_03000D73;
-IWRAM_DATA u8 gUnknown_03000D74[4]; // not really, but won't match otherwise
+IWRAM_DATA u8 gUnknown_03000D74;
-IWRAM_DATA u8 gUnknown_03000D78[8]; // not really, but won't match otherwise
+ALIGNED() IWRAM_DATA u8 gUnknown_03000D78;
-IWRAM_DATA u8 gUnknown_03000D80[16];
+ALIGNED(8) IWRAM_DATA u8 gUnknown_03000D80[16];
 IWRAM_DATA u16 gUnknown_03000D90[8];
 IWRAM_DATA u32 gUnknown_03000DA0;
 IWRAM_DATA u32 gUnknown_03000DA4;
@@ -51,6 +56,60 @@ IWRAM_DATA bool32 gUnknown_03000DB0;
 
 // Static ROM declarations
 
+void sub_800E700(void);
+u32 sub_800BEC0(void);
+void sub_800B4A4(void);
+
 // .rodata
 
+ALIGNED(4) const u16 gWirelessLinkDisplayPal[] = INCBIN_U16("graphics/interface/wireless_link_display.gbapal");
+const u8 gWirelessLinkDisplayGfx[] = INCBIN_U8("graphics/interface/wireless_link_display.4bpp.lz");
+const u8 gWirelessLinkDisplayTilemap[] = INCBIN_U8("graphics/interface/wireless_link_display.bin.lz");
+const u16 gLinkTestDigitsPal[] = INCBIN_U16("graphics/interface/link_test_digits.gbapal");
+const u16 gLinkTestDigitsGfx[] = INCBIN_U16("graphics/interface/link_test_digits.4bpp");
+
 // .text
+
+bool8 sub_80093CC(void)
+{
+    sub_800B488();
+    sub_800E700();
+    if (sub_800BEC0() == 0x8001)
+    {
+        rfu_REQ_stopMode();
+        rfu_waitREQComplete();
+        return TRUE;
+    }
+    sub_800B4A4();
+    sub_80097E8();
+    RestoreSerialTimer3IntrHandlers();
+    return FALSE;
+}
+
+void sub_8009404(u8 taskId)
+{
+    DestroyTask(taskId);
+}
+
+void sub_8009414(u8 a0, u8 a1, u8 a2, u8 a3, u16 a4)
+{
+    LoadPalette(gLinkTestDigitsPal, a0 * 16, 0x20);
+    DmaCopy16(3, gLinkTestDigitsGfx, (u16 *)BG_CHAR_ADDR(a3) + (16 * a4), sizeof gLinkTestDigitsGfx);
+    gUnknown_03003130[0] = a2;
+    gUnknown_03003130[1] = a0;
+    gUnknown_03003130[2] = a4;
+    switch (a1)
+    {
+        case 1:
+            SetGpuReg(REG_OFFSET_BG1CNT, BGCNT_SCREENBASE(a2) | BGCNT_PRIORITY(1) | BGCNT_CHARBASE(a3));
+            break;
+        case 2:
+            SetGpuReg(REG_OFFSET_BG2CNT, BGCNT_SCREENBASE(a2) | BGCNT_PRIORITY(1) | BGCNT_CHARBASE(a3));
+            break;
+        case 3:
+            SetGpuReg(REG_OFFSET_BG3CNT, BGCNT_SCREENBASE(a2) | BGCNT_PRIORITY(1) | BGCNT_CHARBASE(a3));
+            break;
+    }
+    SetGpuReg(REG_OFFSET_BG0HOFS + a1 * 4, 0);
+    SetGpuReg(REG_OFFSET_BG0VOFS + a1 * 4, 0);
+}