ShuriZma
/
mgba
mirror of https://github.com/mgba-emu/mgba.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Implement MidiKey2Freq

This commit is contained in:
Jeffrey Pfau 2013-04-20 03:01:50 -07:00
parent e272481ccd
commit 63e809550d
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/gba/gba-bios.c
View File

@ -3,6 +3,8 @@
#include "gba.h"
#include "gba-memory.h"
#include <math.h>
static void _unLz77(struct GBAMemory* memory, uint32_t source, uint8_t* dest);
static void _CpuSet(struct GBA* gba) {
@ -68,6 +70,11 @@ static void _FastCpuSet(struct GBA* gba) {
}
}
static void _MidiKey2Freq(struct GBA* gba) {
uint32_t key = GBALoad32(&gba->memory.d, gba->cpu.gprs[0] + 4);
gba->cpu.gprs[0] = key / pow(2, (180 - gba->cpu.gprs[1] - gba->cpu.gprs[2] / 256) / 12);
}
void GBASwi16(struct ARMBoard* board, int immediate) {
struct GBA* gba = ((struct GBABoard*) board)->p;
switch (immediate) {
@ -86,6 +93,9 @@ void GBASwi16(struct ARMBoard* board, int immediate) {
case 0x12:
_unLz77(&gba->memory, gba->cpu.gprs[0], &((uint8_t*) gba->video.renderer->vram)[(gba->cpu.gprs[1] & (SIZE_VRAM - 1))]);
break;
case 0x1F:
_MidiKey2Freq(gba);
break;
default:
GBALog(GBA_LOG_STUB, "Stub software interrupt: %02x", immediate);
}