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-rw-r--r--agbx/source/algo/cp.c16
-rw-r--r--agbx/source/bs/done.c15
-rw-r--r--agbx/source/gfx/clrscrn.c24
-rw-r--r--agbx/source/gfx/flip.s37
-rw-r--r--agbx/source/gfx/getvbnk.s65
-rw-r--r--agbx/source/gfx/plot.c19
-rw-r--r--agbx/source/gfx/setpx.c18
-rw-r--r--agbx/source/gfx/vsync.s38
-rw-r--r--agbx/source/key/getkeymap.s2
-rw-r--r--agbx/source/priv/init.s3
10 files changed, 176 insertions, 61 deletions
diff --git a/agbx/source/algo/cp.c b/agbx/source/algo/cp.c
new file mode 100644
index 0000000..651abd8
--- /dev/null
+++ b/agbx/source/algo/cp.c
@@ -0,0 +1,16 @@
+/*
+ Copyright 2022 Gabriel Jensen.
+ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+*/
+
+#include <agbx/priv.h>
+
+#include <agbx/algo.h>
+
+void agbx_cp(void const * const _src,agbx_i20 const _num,void * const _dest) {
+ unsigned char const * src = _src;
+ unsigned char * dest = _dest;
+ unsigned char const * const aftersrc = src + _num;
+ for (;src != aftersrc;++src,++dest) {*dest = *src;}
+}
diff --git a/agbx/source/bs/done.c b/agbx/source/bs/done.c
index be8f423..8e3726d 100644
--- a/agbx/source/bs/done.c
+++ b/agbx/source/bs/done.c
@@ -11,7 +11,7 @@
void agbx_done(agbx_err const _err) {
if (_err == agbx_err_ok) {
__asm__ (
- "swi 0x3\n"
+ "svc 0x3\n"
);
__builtin_unreachable();
}
@@ -19,8 +19,11 @@ void agbx_done(agbx_err const _err) {
agbx_set10(0x400'0000u,0x404u);
agbx_set10(0x500'0000u,0x0u);
agbx_set10(0x500'0002u,0x19u);
- agbx_i8 err[0x8u];
+ agbx_i8 err[0xBu];
for (agbx_i8 pos = 0x0u;pos != 0x8u;++pos) {err[pos] = (agbx_i8)_err >> pos & 0x1u;}
+ err[0x8u] = 0x0u;
+ err[0x9u] = 0x1u;
+ err[0xAu] = 0x0u;
for (agbx_i10 pos = 0x0u;pos != 0x9600u;pos += 0xF0u) {
agbx_setpx1(0x600'0000u,pos, err[0x0u]);
agbx_setpx1(0x600'0000u,pos + 0x1u,err[0x1u]);
@@ -30,12 +33,12 @@ void agbx_done(agbx_err const _err) {
agbx_setpx1(0x600'0000u,pos + 0x5u,err[0x5u]);
agbx_setpx1(0x600'0000u,pos + 0x6u,err[0x6u]);
agbx_setpx1(0x600'0000u,pos + 0x7u,err[0x7u]);
- agbx_setpx1(0x600'0000u,pos + 0x8u,0x0u);
- agbx_setpx1(0x600'0000u,pos + 0x9u,0x1u);
- agbx_setpx1(0x600'0000u,pos + 0xAu,0x0u);
+ agbx_setpx1(0x600'0000u,pos + 0x8u,err[0x8u]);
+ agbx_setpx1(0x600'0000u,pos + 0x9u,err[0x9u]);
+ agbx_setpx1(0x600'0000u,pos + 0xAu,err[0xAu]);
}
__asm__ (
- "swi 0x2\n"
+ "svc 0x2\n"
);
for (;;) {}
}
diff --git a/agbx/source/gfx/clrscrn.c b/agbx/source/gfx/clrscrn.c
new file mode 100644
index 0000000..157498c
--- /dev/null
+++ b/agbx/source/gfx/clrscrn.c
@@ -0,0 +1,24 @@
+/*
+ Copyright 2022 Gabriel Jensen.
+ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+*/
+
+#include <agbx/priv.h>
+
+#include <agbx/gfx.h>
+
+void agbx_clrscrn3(agbx_i10 const _col) {
+ agbx_i20 const val = _col | _col << 0x8u | _col << 0x10u | _col << 0x18u;
+ for (agbx_i20 addr = 0x400'0000u;addr != 0x401'2C00u;addr += 0x4u) {agbx_set20(addr,val);}
+}
+
+void agbx_clrscrn4(agbx_i20 const _vaddr,agbx_i8 const _col) {
+ agbx_i20 const val = _col | _col << 0x8u | _col << 0x10u | _col << 0x18u;
+ for (agbx_i20 addr = _vaddr;addr != _vaddr + 0x9600u;addr += 0x4u) {agbx_set20(addr,val);}
+}
+
+void agbx_clrscrn5(agbx_i20 const _vaddr,agbx_i10 const _col) {
+ agbx_i20 const val = _col | _col << 0x10u;
+ for (agbx_i20 addr = _vaddr;addr != _vaddr + 0xA000u;addr += 0x4u) {agbx_set20(addr,val);}
+}
diff --git a/agbx/source/gfx/flip.s b/agbx/source/gfx/flip.s
index c2f4336..019289d 100644
--- a/agbx/source/gfx/flip.s
+++ b/agbx/source/gfx/flip.s
@@ -7,6 +7,8 @@
.cpu arm7tdmi
.thumb
+.extern __agbx_getvbnk
+
.globl agbx_flip
.func
@@ -14,19 +16,20 @@
.thumb_func
agbx_flip:
+ @ Get the current value of dispcnt:
ldr r0,.dispcntaddr
- ldrh r1,[r0] @ Get the current value of dispcnt.
- movs r2,#0b10000
- eors r1,r2 @ XOR bit five.
- strh r1,[r0] @ Save dispcnt.
- movs r0,#0x10
- tst r1,r0 @ Check what video bank we should return the address of.
- beq .vbnk0
-.vbnk1:
- ldr r0,.vbnk1addr
- bx lr
-.vbnk0:
- ldr r0,.vbnk0addr
+ ldrh r1,[r0]
+
+ @ XOR bit five:
+ movs r2,0b10000
+ eors r1,r2
+
+ @ Save dispcnt:
+ strh r1,[r0]
+
+ @ Get the address of the video bank:
+ b __agbx_getvbnk
+
bx lr
.endfunc
@@ -35,13 +38,3 @@ agbx_flip:
.dispcntaddr:
.long 0x4000000
-
-.align
-
-.vbnk0addr:
- .long 0x6000000
-
-.align
-
-.vbnk1addr:
- .long 0x600A000
diff --git a/agbx/source/gfx/getvbnk.s b/agbx/source/gfx/getvbnk.s
new file mode 100644
index 0000000..e04a127
--- /dev/null
+++ b/agbx/source/gfx/getvbnk.s
@@ -0,0 +1,65 @@
+@ Copyright 2022 Gabriel Jensen.
+@ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+@ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+.syntax unified
+
+.cpu arm7tdmi
+.thumb
+
+.globl __agbx_getvbnk
+.globl agbx_getvbnk
+
+.func
+
+.thumb_func
+
+agbx_getvbnk:
+ @ Get the current value of dispcnt:
+ ldr r0,.dispcntaddr
+ ldrh r1,[r0]
+
+ @ Get the address:
+ b __agbx_getvbnk
+
+ bx lr
+
+.endfunc
+
+.func
+
+.thumb_func
+
+__agbx_getvbnk: @ Takes the value of dispcnt in r1.
+ @ Check if the fifth bit is set:
+ movs r0,0b10000
+ tst r1,r0
+
+ bne .vbnk1
+
+.vbnk0:
+ @ Return the address of the first video bank:
+ ldr r0,.vbnk0addr
+ bx lr
+
+.vbnk1:
+ @ Return the address of the second video bank:
+ ldr r0,.vbnk1addr
+ bx lr
+
+.endfunc
+
+.align
+
+.dispcntaddr:
+ .long 0x4000000
+
+.align
+
+.vbnk0addr:
+ .long 0x6000000
+
+.align
+
+.vbnk1addr:
+ .long 0x600A000
diff --git a/agbx/source/gfx/plot.c b/agbx/source/gfx/plot.c
index cc41d38..e23834c 100644
--- a/agbx/source/gfx/plot.c
+++ b/agbx/source/gfx/plot.c
@@ -9,30 +9,19 @@
#include <agbx/gfx.h>
agbx_i10 agbx_plot3(agbx_i8 const _x,agbx_i8 const _y,agbx_i10 const _col) {
-#if defined(__agbx_dbg)
- if (_x >= 0xF0u || _y >= 0xA0u) {agbx_done(agbx_err_pos2big);}
-#endif
agbx_i10 const px = _y * 0xF0u + _x;
__agbx_setpx2(0x600'0000u,px,_col)
return px;
}
-agbx_i10 agbx_plot4(agbx_i8 const _x,agbx_i8 const _y,agbx_i8 const _col) {
-#if defined(__agbx_dbg)
- if (_x >= 0xF0u || _y >= 0xA0u) {agbx_done(agbx_err_pos2big);}
-#endif
- agbx_i20 const vaddr = 0x600'0000u + (agbx_get10(0x400'0000u) >> 0x4u & 0x1u) * 0xA000u;
+agbx_i10 agbx_plot4(agbx_i20 const _vaddr,agbx_i8 const _x,agbx_i8 const _y,agbx_i8 const _col) {
agbx_i10 const px = _y * 0xF0u + _x;
- agbx_setpx1(vaddr,px,_col);
+ agbx_setpx1(_vaddr,px,_col);
return px;
}
-agbx_i10 agbx_plot5(agbx_i8 const _x,agbx_i8 const _y,agbx_i10 const _col) {
-#if defined(__agbx_dbg)
- if (_x >= 0xA0u || _y >= 0x80u) {agbx_done(agbx_err_pos2big);}
-#endif
- agbx_i20 const vaddr = 0x600'0000u + (agbx_get10(0x400'0000u) >> 0x4u & 0x1u) * 0xA000u;
+agbx_i10 agbx_plot5(agbx_i20 const _vaddr,agbx_i8 const _x,agbx_i8 const _y,agbx_i10 const _col) {
agbx_i10 const px = _y * 0xF0u + _x;
- __agbx_setpx2(vaddr,px,_col)
+ __agbx_setpx2(_vaddr,px,_col)
return px;
}
diff --git a/agbx/source/gfx/setpx.c b/agbx/source/gfx/setpx.c
index d7d3110..df3f0de 100644
--- a/agbx/source/gfx/setpx.c
+++ b/agbx/source/gfx/setpx.c
@@ -9,12 +9,6 @@
#include <agbx/gfx.h>
void agbx_setpx1(agbx_i20 const _vaddr,agbx_i10 const _px,agbx_i8 const _col) {
-#if defined(__agbx_dbg)
- agbx_i10 const dispcnt = agbx_get10(0x400'0000u);
- agbx_i8 const md = dispcnt & 0x7u;
- if (md != 0x4u) {agbx_done(agbx_err_badmd);}
- if (_px >= 0x9600u) {agbx_done(agbx_err_px2big);}
-#endif
/* We can only write halfwords to VRAM, so we load the adjacent pixel value and combine it into a halfword. */
agbx_i20 const addr = _vaddr + _px - (_px & 0x1u) * 0x1u;
agbx_i10 col;
@@ -24,17 +18,5 @@ void agbx_setpx1(agbx_i20 const _vaddr,agbx_i10 const _px,agbx_i8 const _col) {
}
void agbx_setpx2(agbx_i20 const _vaddr,agbx_i10 const _px,agbx_i10 const _col) {
-#if defined(__agbx_dbg)
- agbx_i10 const dispcnt = agbx_get10(0x400'0000u);
- agbx_i8 const md = dispcnt & 0x7u;
- if (md == 0x4u) {agbx_done(agbx_err_badmd);}
- if (md == 0x5u) {
- if (_px >= 0x5000u) {agbx_done(agbx_err_px2big);}
- }
- else {
- if (md != 0x3u) {agbx_done(agbx_err_badmd);}
- if (_px >= 0x9600u) {agbx_done(agbx_err_px2big);}
- }
-#endif
__agbx_setpx2(_vaddr,_px,_col)
}
diff --git a/agbx/source/gfx/vsync.s b/agbx/source/gfx/vsync.s
new file mode 100644
index 0000000..5bfbe06
--- /dev/null
+++ b/agbx/source/gfx/vsync.s
@@ -0,0 +1,38 @@
+@ Copyright 2022 Gabriel Jensen.
+@ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+@ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+.syntax unified
+
+.cpu arm7tdmi
+.thumb
+
+.globl agbx_vsync
+
+.func
+
+.thumb_func
+
+agbx_vsync:
+ @ Set the constants:
+ ldr r0,.scancnt @ Address of the scanline counter register.
+ movs r1,0xA0 @ Number of horizontal lines;
+
+.loop:
+ @ Check the scanline counter:
+ ldr r2,[r0] @ Load the counter.
+ cmp r2,r1 @ Check if it has reached the bottom.
+ beq .ret @ Return if so.
+
+.ret:
+ @ Return:
+ bx lr
+
+.endfunc
+
+.align
+
+.scancnt:
+ .long 0x4000000
+
+.align
diff --git a/agbx/source/key/getkeymap.s b/agbx/source/key/getkeymap.s
index bb3638e..e433f04 100644
--- a/agbx/source/key/getkeymap.s
+++ b/agbx/source/key/getkeymap.s
@@ -14,8 +14,10 @@
.thumb_func
agbx_getkeymap:
+ @ Load the keys:
ldr r0,.addr
ldrh r0,[r0]
+
bx lr
.endfunc
diff --git a/agbx/source/priv/init.s b/agbx/source/priv/init.s
index ec0b6df..302cb29 100644
--- a/agbx/source/priv/init.s
+++ b/agbx/source/priv/init.s
@@ -17,7 +17,10 @@
.thumb_func
__agbx_init:
+ @ Call main:
bl agbx_main
+
+ @ Call done:
bl agbx_done @ The return value is already in r0, so there's no need to move it.
.endfunc
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 05:08:35 +0100