make the FastSpiByte interface generic and implement it in Atm128Spi

diff --git a/tos/interfaces/FastSpiByte.nc b/tos/interfaces/FastSpiByte.nc
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+++ b/tos/interfaces/FastSpiByte.nc
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+/*
+ * Copyright (c) 2007, Vanderbilt University
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE VANDERBILT UNIVERSITY BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE VANDERBILT
+ * UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE VANDERBILT UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE VANDERBILT UNIVERSITY HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Author: Miklos Maroti
+ */
+
+/**
+ * This is a natural extension of the SpiByte interface which allows fast 
+ * data transfers comparable to the SpiStream interface. You may want to
+ * use the following code sequence to write a buffer as fast as possible
+ *
+ *     call FastSpiByte.spiSplitWrite(data[0]); // start the first byte
+ *     for(i = 1; i < length; ++i) {
+ *        // finish the previous one and write the next one
+ *       call FastSpiByte.spiSplitReadWrite(data[i]);
+ *     }
+ *     call FastSpiByte.spiSlitRead(); // finish the last byte
+ *
+ * You can also do some useful computation (like calculate a CRC) while the
+ * hardware is sending the byte.
+ */
+interface FastSpiByte
+{
+       /**
+        * Starts a split-phase SPI data transfer with the given data.
+        * A splitRead/splitReadWrite command must follow this command even 
+        * if the result is unimportant.
+        */
+       async command void splitWrite(uint8_t data);
+
+       /**
+        * Finishes the split-phase SPI data transfer by waiting till 
+        * the write command comletes and returning the received data.
+        */
+       async command uint8_t splitRead();
+
+       /**
+        * This command first reads the SPI register and then writes
+        * there the new data, then returns. 
+        */
+       async command uint8_t splitReadWrite(uint8_t data);
+
+       /**
+        * This is the standard SpiByte.write command but a little
+        * faster as we should not need to adjust the power state there.
+        * (To be consistent, this command could have be named splitWriteRead).
+        */
+       async command uint8_t write(uint8_t data);
+}