huge work on FAT32, initial support for writing

ext/sd/tests/TestAccessHelper.cpp

@@ -5,12 +5,12 @@
 #include "../AccessHelper.h"
 
 
-/*
+
 TEST (TestAccessHelper, read) {
 
 	// read varying numbers of bytes at arbitrary locations
 
-	TestDevice dev;
+	TestDevice dev(4096);
 	AccessHelper<TestDevice> ah(dev);
 	for (size_t i = 0; i < sizeof(dev.buf); ++i) {dev.buf[i] = i;}
 
@@ -33,14 +33,14 @@ TEST (TestAccessHelper, read) {
 	}
 
 }
-*/
+
 
 TEST (TestAccessHelper, write) {
 
 	// write varying numbers of bytes at arbitrary locations
 
 	const uint8_t MAGIC = 0xFF;
-	TestDevice dev;
+	TestDevice dev(4096);
 	AccessHelper<TestDevice> ah(dev);
 
 	// src data