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Comment zelda's "SetupAccelerator" now that we know what that op is...

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3525 8ced0084-cf51-0410-be5f-012b33b47a6e
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hrydgard
2009-06-21 12:24:36 +00:00
parent edc7b17924
commit 8001dbebc4
1 changed files with 17 additions and 9 deletions
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26
docs/DSP/DSP_UC_Zelda.txt
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@ -1814,15 +1814,23 @@ void 05A4_ResetAccelerator()
} }
void 05ad_SetupAccelerator(_accleratorH(AC0.M), _accleratorL(AC0.L), _format(AC1.M)) void 05ad_SetupAccelerator(_acceleratorH(AC0.M), _accleratorL(AC0.L), _format(AC1.M))
{ {
05ad 00ff ffd1 sr @SampleFormat, $AC1.M // 05ad 00ff ffd1 sr @SampleFormat, $AC1.M
05af 0340 0003 andi $AC1.M, #0x0003 *SampleFormat = AC1.M
05b1 7900 decm $AC1.M
05b2 02ca cw 0x02ca ; *** UNKNOWN OPCODE *** // 05af 0340 0003 andi $AC1.M, #0x0003
05b3 00fe ffd8 sr @ACCAH, $AC0.M // 05b1 7900 decm $AC1.M
05b5 00fc ffd9 sr @ACCAL, $AC0.L // 05b2 02ca lsrn // ACC0 >>= AC1.M
05b7 02df ret // 05b3 00fe ffd8 sr @ACCAH, $AC0.M
// 05b5 00fc ffd9 sr @ACCAL, $AC0.L
*ACCAH/ACCAL = address >> ((sampleFormat & 3) - 1);
// ACCAH/ACCAL is current read address
// Hm, this seems to imply some direct relationship between the sample format number and
// the nibbles-per-sample value
// 05b7 02df ret
} }
void 05b8_NewMail() void 05b8_NewMail()