RTC revamp (melonDS-emu#1867)

* get this started

* implement DSi RTC commands

* set up RTC clock timer. lay down basic idea of a clock.

* make the date/time registers writable

* move RTC state to its own structure, to make it easier to deal with

* more RTC work
lay base for date/time dialog

* get the bulk of the RTC functionality going

* much simpler design for RTC stuff

* aha, that is what it is

* start working on the RTC IRQ

* implement all types of RTC IRQ

* start refining sleep mode. code still kinda sucks.

* implement keypad IRQ

* refine it some more

* shut the fuck uuuuuupppppppppppppp

src/DSi.cpp

@@ -959,10 +959,10 @@ void RunNDMAs(u32 cpu)
     {
         if (NDS::ARM9Timestamp >= NDS::ARM9Target) return;
 
-        if (!(NDS::CPUStop & 0x80000000)) NDMAs[0]->Run();
-        if (!(NDS::CPUStop & 0x80000000)) NDMAs[1]->Run();
-        if (!(NDS::CPUStop & 0x80000000)) NDMAs[2]->Run();
-        if (!(NDS::CPUStop & 0x80000000)) NDMAs[3]->Run();
+        if (!(NDS::CPUStop & NDS::CPUStop_GXStall)) NDMAs[0]->Run();
+        if (!(NDS::CPUStop & NDS::CPUStop_GXStall)) NDMAs[1]->Run();
+        if (!(NDS::CPUStop & NDS::CPUStop_GXStall)) NDMAs[2]->Run();
+        if (!(NDS::CPUStop & NDS::CPUStop_GXStall)) NDMAs[3]->Run();
     }
     else
     {

src/GPU.cpp

@@ -1096,6 +1096,24 @@ void FinishFrame(u32 lines)
     }
 }
 
+void BlankFrame()
+{
+    int backbuf = FrontBuffer ? 0 : 1;
+    int fbsize;
+    if (GPU3D::CurrentRenderer->Accelerated)
+        fbsize = (256*3 + 1) * 192;
+    else
+        fbsize = 256 * 192;
+
+    memset(Framebuffer[backbuf][0], 0, fbsize*4);
+    memset(Framebuffer[backbuf][1], 0, fbsize*4);
+
+    FrontBuffer = backbuf;
+    AssignFramebuffers();
+
+    TotalScanlines = 263;
+}
+
 void StartScanline(u32 line)
 {
     if (line == 0)

src/GPU.h

@@ -607,6 +607,7 @@ void SetPowerCnt(u32 val);
 
 void StartFrame();
 void FinishFrame(u32 lines);
+void BlankFrame();
 void StartScanline(u32 line);
 void StartHBlank(u32 line);