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25 lines
485 B
C
25 lines
485 B
C
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#include <global.h>
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#include <ultra64/hardware.h>
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s32 osAiSetFrequency(u32 frequency) {
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u32 dacRate;
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u8 bitrate;
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f32 dacRateF;
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dacRateF = ((f32)osViClock / frequency) + 0.5f;
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dacRate = dacRateF;
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if (dacRate < 132) {
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return -1;
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}
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bitrate = (dacRate / 66);
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if (bitrate > 16) {
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bitrate = 16;
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}
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HW_REG(AI_DACRATE_REG, u32) = dacRate - 1;
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HW_REG(AI_BITRATE_REG, u32) = bitrate - 1;
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return osViClock / (s32)dacRate;
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}
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