Initial commit

arm9/source/rtcIpc.cpp

@@ -0,0 +1,42 @@
+#include "common.h"
+#include <string.h>
+#include <nds/arm9/cache.h>
+#include <libtwl/rtos/rtosEvent.h>
+#include <libtwl/rtos/rtosMutex.h>
+#include <libtwl/ipc/ipcFifoSystem.h>
+#include "ipcChannels.h"
+#include "rtcIpc.h"
+
+static rtos_mutex_t sMutex;
+static rtos_event_t sEvent;
+
+alignas(32) static union
+{
+    rtc_datetime_t dateTime;
+    u8 sizeAlign[32]; // ensure the size is also cache aligned to not corrupt nearby memory when invalidating
+} sDateTime;
+
+static void ipcMessageHandler(u32 channel, u32 data, void* arg)
+{
+    rtos_signalEvent(&sEvent);
+}
+
+void rtc_init()
+{
+    rtos_createMutex(&sMutex);
+    rtos_createEvent(&sEvent);
+    ipc_setChannelHandler(IPC_CHANNEL_RTC, ipcMessageHandler, nullptr);
+}
+
+void rtc_readDateTime(rtc_datetime_t* dateTime)
+{
+    rtos_lockMutex(&sMutex);
+    {
+        rtos_clearEvent(&sEvent);
+        DC_InvalidateRange(&sDateTime, sizeof(sDateTime));
+        ipc_sendFifoMessage(IPC_CHANNEL_RTC, (u32)&sDateTime >> 2);
+        rtos_waitEvent(&sEvent, false, true);
+        memcpy(dateTime, &sDateTime.dateTime, sizeof(rtc_datetime_t));
+    }
+    rtos_unlockMutex(&sMutex);
+}