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Fix a couple issues with frequency calculation

This commit is contained in:
Sean Maas 2021-03-03 23:13:42 -05:00
parent 79726c7ae9
commit 6759ecc06e
1 changed files with 5 additions and 1 deletions
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6
src/nds/arm7/nds_audio.c
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@ -2,10 +2,14 @@
#include "nds_audio.h"
// Better frequency calculation
#undef SOUND_FREQ
#define SOUND_FREQ(n) (-(BUS_CLOCK >> 1) / (n))
static u16 calculate_freq(const struct Note *note) {
// Calculate the DS frequency for a note
// Some frequencies are too high, but clipping at least lets them get as close as possible
u32 freq = note->frequency * 32768;
u32 freq = note->frequency * 32000;
if (freq > 0xFFFF) freq = 0xFFFF;
return SOUND_FREQ((u16)freq);
}