initial commit

1 files changed, 85 insertions, 0 deletions

diff --git a/src/agb_flash_1m.c b/src/agb_flash_1m.c
new file mode 100644
index 0000000..85ee0a2
--- /dev/null
+++ b/src/agb_flash_1m.c
@@ -0,0 +1,85 @@
+#include "gba/gba.h"
+#include "gba/flash_internal.h"
+
+static const char AgbLibFlashVersion[] = "FLASH1M_V102";
+
+const struct FlashSetupInfo * const sSetupInfos[] =
+{
+    &MX29L010,
+    &LE26FV10N1TS,
+    &DefaultFlash
+};
+
+u16 IdentifyFlash(void)
+{
+    u16 result;
+    u16 flashId;
+    const struct FlashSetupInfo * const *setupInfo;
+
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | WAITCNT_SRAM_8;
+
+    flashId = ReadFlashId();
+
+    setupInfo = sSetupInfos;
+    result = 1;
+
+    for (;;)
+    {
+        if ((*setupInfo)->type.ids.separate.makerId == 0)
+            break;
+
+        if (flashId == (*setupInfo)->type.ids.joined)
+        {
+            result = 0;
+            break;
+        }
+
+        setupInfo++;
+    }
+
+    ProgramFlashSector = (*setupInfo)->programFlashSector;
+    EraseFlashChip = (*setupInfo)->eraseFlashChip;
+    EraseFlashSector = (*setupInfo)->eraseFlashSector;
+    WaitForFlashWrite = (*setupInfo)->waitForFlashWrite;
+    gFlashMaxTime = (*setupInfo)->maxTime;
+    gFlash = &(*setupInfo)->type;
+
+    return result;
+}
+
+u16 WaitForFlashWrite_Common(u8 phase, u8 *addr, u8 lastData)
+{
+    u16 result = 0;
+    u8 status;
+
+    StartFlashTimer(phase);
+
+    while ((status = PollFlashStatus(addr)) != lastData)
+    {
+        if (status & 0x20)
+        {
+            // The write operation exceeded the flash chip's time limit.
+
+            if (PollFlashStatus(addr) == lastData)
+                break;
+
+            FLASH_WRITE(0x5555, 0xF0);
+            result = phase | 0xA000u;
+            break;
+        }
+
+        if (gFlashTimeoutFlag)
+        {
+            if (PollFlashStatus(addr) == lastData)
+                break;
+
+            FLASH_WRITE(0x5555, 0xF0);
+            result = phase | 0xC000u;
+            break;
+        }
+    }
+
+    StopFlashTimer();
+
+    return result;
+}