Initial commit

source/card.c

@@ -0,0 +1,72 @@
+#include <nds/ndstypes.h>
+#include "card.h"
+
+void card_romCpuRead(u32* dst, u32 words)
+{
+    u32* target = dst + words;
+    do
+    {
+        // Read data if available
+        if (card_romIsDataReady())
+        {
+            u32 data = card_romGetData();
+            if (dst < target)
+                *dst++ = data;
+        }
+    } while (card_romIsBusy());
+}
+
+void card_romCpuReadUnaligned(u8* dst, u32 words)
+{
+    u8* target = dst + (words << 2);
+    do
+    {
+        // Read data if available
+        if (card_romIsDataReady())
+        {
+            u32 data = card_romGetData();
+            if (dst < target)
+            {
+                *dst++ = data & 0xFF;
+                *dst++ = (data >> 8) & 0xFF;
+                *dst++ = (data >> 16) & 0xFF;
+                *dst++ = (data >> 24) & 0xFF;
+            }
+        }
+    } while (card_romIsBusy());
+}
+
+void card_romCpuWrite(const u32* src, u32 words)
+{
+    u32 data = 0;
+    const u32* target = src + words;
+    do
+    {
+        // Write data if ready
+        if (card_romIsDataReady())
+        {
+            if (src < target)
+                data = *src++;
+            card_romSetData(data);
+        }
+    } while (card_romIsBusy());
+}
+
+void card_romCpuWriteUnaligned(const u8* src, u32 words)
+{
+    u32 data = 0;
+    const u8* target = src + (words << 2);
+    do
+    {
+        // Write data if ready
+        if (card_romIsDataReady())
+        {
+            if (src < target)
+            {
+                data = src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
+                src += 4;
+            }
+            card_romSetData(data);
+        }
+    } while (card_romIsBusy());
+}