1 files changed, 66 insertions, 0 deletions
diff --git a/arm9/src/timer3.c b/arm9/src/timer3.c
new file mode 100644
index 00000000..1799fd24
--- /dev/null
+++ b/arm9/src/timer3.c
@@ -0,0 +1,66 @@
+#include "timer3.h"
+
+struct Timer3Data timer3_data;
+
+
+THUMB_FUNC void Init_Timer3()
+{
+    timer3_data.Timer3Counter = 0;
+    timer3_data.NeedReset = FALSE;
+
+    reg_OS_TM3CNT_H = 0;
+    reg_OS_TM3CNT_L = 0;
+    reg_OS_TM3CNT_H = 0xc1; // start timer3 with f/64 and irq enable
+
+    OS_SetIrqFunction(0x40, &CountUpTimer3);
+    OS_EnableIrqMask(0x40); // irq on timer3 overflow
+}
+
+
+THUMB_FUNC void CountUpTimer3()
+{
+    timer3_data.Timer3Counter++;
+
+    if (timer3_data.NeedReset)
+    {
+        reg_OS_TM3CNT_H = 0;
+        reg_OS_TM3CNT_L = 0;
+        reg_OS_TM3CNT_H = 0xc1;
+        timer3_data.NeedReset = FALSE;
+    }
+
+    *(vu32 *)HW_INTR_CHECK_BUF |= 0x40;
+
+    OS_SetIrqFunction(0x40, &CountUpTimer3);
+}
+
+THUMB_FUNC u64 internal_GetTimer3Count()
+{
+    OSIntrMode intr_mode = OS_DisableInterrupts();
+
+    vu16 timer3 = reg_OS_TM3CNT_L;
+    vu64 timer3_counter = timer3_data.Timer3Counter & 0x0000ffffffffffff;
+
+    if (reg_OS_IF & 0x40 && !(timer3 & 0x8000))
+    {
+        timer3_counter++;
+    }
+
+    OS_RestoreInterrupts(intr_mode);
+    return (timer3_counter << 16) | timer3;
+}
+
+THUMB_FUNC u64 GetTimer3Count()
+{
+    return internal_GetTimer3Count();
+}
+
+THUMB_FUNC u64 Timer3CountToMilliSeconds(u64 count)
+{
+    return (count *64) / 33514;
+}
+
+THUMB_FUNC u64 Timer3CountToSeconds(u64 count)
+{
+    return (count *64) / HW_SYSTEM_CLOCK;
+}