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libraries/SdFat/examples/examplesV1/#attic/MiniSerial/MiniSerial.ino

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+// This example illustrates use of SdFat's
+// minimal unbuffered AVR Serial support.
+//
+// This is useful for debug and saves RAM
+// Will not work on Due, Leonardo, or Teensy
+
+#include <SPI.h>
+#include "SdFat.h"
+#include "FreeStack.h"
+#ifdef UDR0  // Must be AVR with serial port zero.
+#include "MinimumSerial.h"
+
+MinimumSerial MiniSerial;
+
+void setup() {
+  MiniSerial.begin(9600);
+  MiniSerial.println(FreeStack());
+}
+void loop() {
+  int c;
+  MiniSerial.println(F("Type any Character"));
+  while ((c = MiniSerial.read()) < 0) {}
+  MiniSerial.print(F("Read: "));
+  MiniSerial.println((char)c);
+  while (MiniSerial.read() >= 0) {}
+}
+#else  // UDR0
+#error no AVR serial port 0
+#endif  // UDR0