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annotate audio.s16 @ 24:4c9dbfa30a66

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Implemented audio
author Michael Pavone <pavone@retrodev.com>
date Thu, 31 Mar 2016 00:07:37 -0700
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24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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1 ;48000 x 16 / VALUE = FREQ
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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2 ;48000 x 16 = VALUE * FREQ
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Michael Pavone <pavone@retrodev.com>
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3 ;48000 x 16 / FREQ = VALUE
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Michael Pavone <pavone@retrodev.com>
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4 ;A = 440Hz ~ 1745 = $6D1
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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5 ;C# = 554.365Hz ~ 1385 = $569
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Michael Pavone <pavone@retrodev.com>
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6 ;E = 659.255Hz ~ 1165 = $48D
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7
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8 ;Channel A
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Michael Pavone <pavone@retrodev.com>
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9 ldim $D1, r0
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Michael Pavone <pavone@retrodev.com>
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10 ldimh $6, r0
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Michael Pavone <pavone@retrodev.com>
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11 outi 4, r0
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12
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13 ;Channel B
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Michael Pavone <pavone@retrodev.com>
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14 ldim $69, r0
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Michael Pavone <pavone@retrodev.com>
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15 ldimh $5, r0
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16 outi 5, r0
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17
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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18 ;Channel C
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19 ldim $8D, r0
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20 ldimh $4, r0
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Michael Pavone <pavone@retrodev.com>
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21 outi 6, r0
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22
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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23 ;Channel D
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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24 ldim $A2, r0
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
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25 ldimh $D, r0
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Michael Pavone <pavone@retrodev.com>
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26 outi 7, r0
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27
4c9dbfa30a66 Implemented audio
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28 ldim $FF, r0
4c9dbfa30a66 Implemented audio
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29 ldimh $FF, r0
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30 outi 8, r0
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31 outi 9, r0
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32 done
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33 bra done