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Nintendo® Confidential

## osAiSetFrequency

Syntax
#include <ultra64.h>
s32 osAiSetFrequency(u32 frequency);
Explanation
The osAiGetStatus, osAiGetLength, osAiSetFrequency, and osAiSetNextBuffer routines provide basic control for the AI (audio interface).
Based on the input requested frequency (in Hz), the osAiSetFrequency function calculates the correct values for the internal divisors and returns the actual frequency generated by these divisors. The requested frequency should fall between 3000 Hz and 368000 Hz on NTSC systems, or between 3050 Hz and 376000 Hz on PAL systems.
Notes
For hardware version 1.0, the audio DMA length register is only 15 bits long and thus supports a maximum transfer size of 32 Kbytes. In the final release, this register is extended to 18 bits to support a transfer of 256 Kbytes.
See Also
osAiGetStatus
osAiGetLength
osAiSetNextBuffer
osTvType

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Copyright © 1998
Nintendo of America Inc. All rights reserved
Nintendo and N64 are registered trademarks of Nintendo
Last updated March 1998