1 files changed, 70 insertions, 0 deletions
diff --git a/arm9/lib/src/FX_cp.c b/arm9/lib/src/FX_cp.c
new file mode 100644
index 00000000..76dea4b4
--- /dev/null
+++ b/arm9/lib/src/FX_cp.c
@@ -0,0 +1,70 @@
+#include "global.h"
+#include "main.h"
+#include "fx.h"
+
+
+fx32 FX_Div(fx32 numerator, fx32 denominator){
+    FX_DivAsync(numerator, denominator);
+    return FX_GetDivResult();
+}
+
+fx32 FX_Inv(fx32 x){
+    FX_InvAsync(x);
+    return FX_GetDivResult();
+}
+
+fx32 FX_Sqrt(fx32 x){
+    if (x > 0)
+    {
+        SETREG16(HW_REG_SQRTCNT, 0x1);
+        SETREG64(HW_REG_SQRT_PARAM, (fx64)x << 32);
+        return FX_GetSqrtResult();
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+fx64c FX_GetDivResultFx64c(){
+    while (READREG16(HW_REG_DIVCNT) & 0x8000);
+    return READREG64(HW_REG_DIV_RESULT);
+}
+
+fx32 FX_GetDivResult(){
+    while (READREG16(HW_REG_DIVCNT) & 0x8000);
+    return (READREG64(HW_REG_DIV_RESULT) + (1 << (0x14 - 1))) >> 0x14;
+}
+
+void FX_InvAsync(fx32 x){
+    SETREG16(HW_REG_DIVCNT, 0x1);
+    SETREG64(HW_REG_DIV_NUMER, (fx64)0x00001000 << 32);
+    SETREG64(HW_REG_DIV_DENOM, (u32)x);
+}
+
+fx32 FX_GetSqrtResult(){
+    while (READREG16(HW_REG_SQRTCNT) & 0x8000);
+    return (READREG32(HW_REG_SQRT_RESULT) + (1 << (0xA - 1))) >> 0xA;
+}
+
+void FX_DivAsync(fx32 numerator, fx32 denominator){
+    SETREG16(HW_REG_DIVCNT, 0x1);
+    SETREG64(HW_REG_DIV_NUMER, (fx64)numerator << 32);
+    SETREG64(HW_REG_DIV_DENOM, (u32)denominator);
+}
+
+fx32 FX_Divfx32(fx32 numerator, fx32 denominator){
+    SETREG16(HW_REG_DIVCNT, 0x0);
+    SETREG32(HW_REG_DIV_NUMER, (u32)numerator); //32bit write for some reason
+    SETREG64(HW_REG_DIV_DENOM, (u32)denominator);
+    while (READREG16(HW_REG_DIVCNT) & 0x8000);
+    return READREG32(HW_REG_DIV_RESULT);
+}
+
+fx32 FX_Modfx32(fx32 num, fx32 mod){
+    SETREG16(HW_REG_DIVCNT, 0x0);
+    SETREG32(HW_REG_DIV_NUMER, (u32)num); //32bit write for some reason
+    SETREG64(HW_REG_DIV_DENOM, (u32)mod);
+    while (READREG16(HW_REG_DIVCNT) & 0x8000);
+    return READREG32(HW_REG_DIVREM_RESULT);
+}