Settings Driver (#775)

* Settings Driver

tests/unit/test_platform.cpp

@@ -41,6 +41,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 enum
 {
@@ -59,6 +60,14 @@ uint32_t sCallCount[kCallCountIndexMax];
 
 bool sDiagMode = false;
 
+enum
+{
+    kFlashSize = 0x40000,
+    kFlashPageSize = 0x800,
+};
+
+uint8_t sFlashBuffer[kFlashSize];
+
 extern "C" {
 
     void otSignalTaskletPending(otInstance *)
@@ -296,4 +305,72 @@ exit:
         return kPlatResetReason_PowerOn;
     }
 
+    //
+    // Flash
+    //
+    ThreadError otPlatFlashInit(void)
+    {
+        memset(sFlashBuffer, 0xff, kFlashSize);
+        return kThreadError_None;
+    }
+
+    uint32_t otPlatFlashGetSize(void)
+    {
+        return kFlashSize;
+    }
+
+    ThreadError otPlatFlashErasePage(uint32_t aAddress)
+    {
+        ThreadError error = kThreadError_None;
+        uint32_t address;
+
+        VerifyOrExit(aAddress < kFlashSize, error = kThreadError_InvalidArgs);
+
+        // Get start address of the flash page that includes aAddress
+        address = aAddress & (~(uint32_t)(kFlashPageSize - 1));
+        memset(sFlashBuffer + address, 0xff, kFlashPageSize);
+
+exit:
+        return error;
+    }
+
+    ThreadError otPlatFlashStatusWait(uint32_t aTimeout)
+    {
+        (void)aTimeout;
+        return kThreadError_None;
+    }
+
+    uint32_t otPlatFlashWrite(uint32_t aAddress, uint8_t *aData, uint32_t aSize)
+    {
+        uint32_t ret = 0;
+        uint8_t byte;
+
+        VerifyOrExit(aAddress < kFlashSize, ;);
+
+        for (uint32_t index = 0; index < aSize; index++)
+        {
+            byte = sFlashBuffer[aAddress + index];
+            byte &= aData[index];
+            sFlashBuffer[aAddress + index] = byte;
+        }
+
+        ret = aSize;
+
+exit:
+        return ret;
+    }
+
+    uint32_t otPlatFlashRead(uint32_t aAddress, uint8_t *aData, uint32_t aSize)
+    {
+        uint32_t ret = 0;
+
+        VerifyOrExit(aAddress < kFlashSize, ;);
+
+        memcpy(aData, sFlashBuffer + aAddress, aSize);
+        ret = aSize;
+
+exit:
+        return ret;
+    }
+
 } // extern "C"