mirror of
https://github.com/ApacheThunder/r4bootstrap.git
synced 2025-06-19 03:35:41 -04:00
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#include <nds.h>
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volatile bool switchedMode = false;
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volatile bool exitflag = false;
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// libnds messed up the original SWI bios call ASM.
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// They used r0 instead of r2. This reimplementation fixes that issue for now.
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extern void swiSwitchToGBAModeFixed();
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void powerButtonCB() { exitflag = true; }
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void gbaMode() {
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vu32 vr;
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REG_IME = IME_DISABLE;
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for(vr = 0; vr < 0x1000; vr++); // Wait ARM9
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if (PersonalData->gbaScreen) {
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writePowerManagement(PM_CONTROL_REG, PM_BACKLIGHT_BOTTOM | PM_SOUND_AMP);
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} else {
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writePowerManagement(PM_CONTROL_REG, PM_BACKLIGHT_TOP | PM_SOUND_AMP);
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}
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swiSwitchToGBAModeFixed();
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while(1);
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}
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void fifoCheckHandler() {
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if (!switchedMode) {
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if (fifoCheckValue32(FIFO_USER_01)) {
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switchedMode = true;
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gbaMode();
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}
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}
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}
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void VblankHandler() { fifoCheckHandler(); }
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void VcountHandler() { inputGetAndSend(); }
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int main(void) {
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readUserSettings();
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ledBlink(0);
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irqInit();
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initClockIRQ();
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fifoInit();
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touchInit();
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SetYtrigger(80);
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installSystemFIFO();
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irqSet(IRQ_VCOUNT, VcountHandler);
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irqSet(IRQ_VBLANK, VblankHandler);
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irqEnable(IRQ_VBLANK | IRQ_VCOUNT);
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setPowerButtonCB(powerButtonCB);
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if (REG_SNDEXTCNT != 0) {
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i2cWriteRegister(0x4A, 0x12, 0x00); // Press power-button for auto-reset
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i2cWriteRegister(0x4A, 0x70, 0x01); // Bootflag = Warmboot/SkipHealthSafety
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}
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while(1)swiWaitForVBlank();
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return 0;
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}
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