38 lines
709 B
C
38 lines
709 B
C
#include "libultra_internal.h"
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#include "osAi.h"
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#include "hardware.h"
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#include "macros.h"
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extern s32 osViClock;
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s32 osAiSetFrequency(u32 freq) {
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register u32 a1;
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register s32 a2;
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register float ftmp;
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ftmp = osViClock / (float) freq + .5f;
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a1 = ftmp;
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if (a1 < 0x84) {
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return -1;
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}
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a2 = (a1 / 66) & 0xff;
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if (a2 > 16) {
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a2 = 16;
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}
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HW_REG(AI_DACRATE_REG, u32) = a1 - 1;
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HW_REG(AI_BITRATE_REG, u32) = a2 - 1;
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HW_REG(AI_CONTROL_REG, u32) = 1; // enable dma
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return osViClock / (s32) a1;
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}
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#ifndef VERSION_SH
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// put some extra jr $ra's down there please
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UNUSED static void filler1(void) {
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}
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UNUSED static void filler2(void) {
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}
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#endif
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