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document EEPROMWrite locals

This commit is contained in:
Henny022p 2021-03-01 17:09:14 +01:00
parent 364edc85dc
commit 8331be4f29
1 changed files with 21 additions and 36 deletions
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57
src/code_080B1520.c
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@ -101,21 +101,22 @@ u16 EEPROMWrite1(u16 address, u16* data) {
return EEPROMWrite(address, data, 1);
}
// reading from EEPROM like a status register
#define REG_EEPROM (*(u16*)0xd000000)
// this is the furthest I could get
// 0x080B16AC
NONMATCH("asm/non_matching/code_080B1520/EEPROMWrite.inc", u16 EEPROMWrite(u16 address, u16* data, u8 unk_3)) {
u16 buffer[0x52]; // this is one too large?
vu16 stack_a4;
vu16 stack_a6;
vu16 stack_a8;
vu32 stack_ac;
vu16 prev_vcount; // stack + a6
vu16 current_vcount; // stack + a6
vu32 passed_scanlines; // stack + ac
u32 r0, r1, r2;
u32 r2;
u8 i, j;
u16* ptr;
r1 = address;
if (address >= gEEPROMConfig->size)
return EEPROM_OUT_OF_RANGE;
@ -134,59 +135,43 @@ NONMATCH("asm/non_matching/code_080B1520/EEPROMWrite.inc", u16 EEPROMWrite(u16 a
}
// copy address to buffer
for (i = 0; i < gEEPROMConfig->address_width; i++) {
*ptr = r1;
*ptr = address;
ptr--;
r1 = r1 >> 1;
address = address >> 1;
}
*ptr = 0;
ptr--;
*ptr = 1;
DMA3Transfer(buffer, (u16*)0xd000000, gEEPROMConfig->address_width + 0x43);
stack_a4 = 0;
stack_a6 = REG_VCOUNT;
stack_ac = 0;
prev_vcount = REG_VCOUNT;
passed_scanlines = 0;
if (stack_a4 == 0) {
r0 = *(u16*)0xd000000;
r0 &= 1;
if (r0 != 0)
if ((REG_EEPROM & 1) != 0)
goto bad;
}
// before here its only regalloc, but after I cant get it to work
do {
do {
do {
stack_a8 = REG_VCOUNT;
if (stack_a8 != stack_a6) {
if (stack_a8 > stack_a6) {
r1 = stack_a8;
r0 = stack_a6;
r1 = r1 - r0;
r0 = stack_ac;
r1 = r1 + r0;
stack_ac = r1;
current_vcount = REG_VCOUNT;
if (current_vcount != prev_vcount) {
if (current_vcount >= prev_vcount) {
passed_scanlines += current_vcount - prev_vcount;
} else {
r0 = stack_a8 + 0xe4;
r1 = stack_a6;
r0 = r0 - r1;
r1 = stack_ac;
r0 = r0 + r1;
stack_ac = r0;
passed_scanlines += (current_vcount + 0xe4) - prev_vcount;
}
if (stack_ac > 0x88) {
if (passed_scanlines > 0x88) {
if (stack_a4 != 0)
return 0;
r0 = *(u16*)0xd000000;
r0 &= 1;
if (r0 != 0)
if ((REG_EEPROM & 1) != 0)
return 0;
return 0xc001;
}
stack_a6 = stack_a8;
prev_vcount = current_vcount;
}
} while (stack_a4 != 0);
r1 = 1;
r0 = *(u16*)0xd000000;
r1 &= r0;
} while (r1 != 0);
} while ((REG_EEPROM & 1) != 0);
bad:
stack_a4++;
} while (unk_3 != 0);