DMA source mode *must* be inc if the source addr is in ROM.

dump.bat

@@ -1,11 +1,15 @@
 cargo build --examples
 
+arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/basic_keyinput >target/ex-basic_keyinput.txt
+
 arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/do_nothing >target/ex-do_nothing.txt
 
-arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/basic_keyinput >target/ex-basic_keyinput.txt
+arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/mode0 >target/ex-mode0.txt
 
 arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/mode3 >target/ex-mode3.txt
 
 arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/mode4 >target/ex-mode4.txt
 
 arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/mode5 >target/ex-mode5.txt
+
+arm-none-eabi-objdump --headers --disassemble --demangle --architecture=armv4t --no-show-raw-insn -Mreg-names-std target/thumbv4t-none-eabi/debug/examples/paddle_ball >target/ex-paddle_ball.txt

examples/paddle_ball.rs

@@ -6,13 +6,15 @@
 #![no_std]
 #![no_main]
 
+use core::ptr::addr_of;
+
 use gba::{
   asm_runtime::USER_IRQ_HANDLER,
   bios::VBlankIntrWait,
   gba_cell::GbaCell,
   mmio::{
     DISPCNT, DISPSTAT, DMA3_CONTROL, DMA3_DESTINATION, DMA3_SOURCE,
-    DMA3_TRANSFER_COUNT, IE, IME, KEYINPUT, MODE3_VRAM,
+    DMA3_TRANSFER_COUNT, IE, IME, KEYINPUT, MODE3_VRAM, OBJ_PALRAM,
   },
   video::{Color, DisplayControl, DisplayStatus},
   IrqBits, KeyInput,
@@ -147,8 +149,8 @@ fn main() -> ! {
 extern "C" fn draw_sprites(_bits: IrqBits) {
   unsafe {
     // Clear VRAM using DMA3
-    let x = &0_u32;
-    DMA3_SOURCE.write((x as *const u32).cast());
+    let x: u32 = 0 * OBJ_PALRAM.index(0).read().0 as u32;
+    DMA3_SOURCE.write(addr_of!(x).cast());
     DMA3_DESTINATION.write(MODE3_VRAM.as_usize() as *mut _);
     DMA3_TRANSFER_COUNT.write(240 * 160 / 2);
     DMA3_CONTROL.write(1 << 15 | 1 << 10 | 2 << 7);