Merge TinyOS 2.1.1 into master.

[tinyos-2.x.git] / tos / chips / ds2401 / HplDs2401C.nc

diff --git a/tos/chips/ds2401/HplDs2401C.nc b/tos/chips/ds2401/HplDs2401C.nc
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+++ b/tos/chips/ds2401/HplDs2401C.nc
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+// $Id$
+/*
+ * 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: Janos Sallai
+ */
+
+#include "Ds2401.h"
+
+/**
+ * HPL for the DS2401 hardware ID chip.
+ */
+module HplDs2401C {
+  provides interface HplDs2401 as Hpl;
+  uses interface OneWireMaster as OneWire;
+}
+implementation {
+  bool busy = FALSE;
+
+  async command error_t Hpl.read(ds2401_serial_t* rom) {
+    uint8_t i;
+
+    if(busy) {
+      return EBUSY;
+    }
+
+    busy = TRUE;
+
+    call OneWire.init();
+
+    if(call OneWire.reset() != SUCCESS) {
+      call OneWire.release();
+      busy = FALSE;
+      return EOFF;
+    }
+
+    call OneWire.writeByte(0x33);
+
+    for(i=0;i<DS2401_DATA_LENGTH;i++) {
+      rom->data[i] = call OneWire.readByte();
+    }
+
+    // TODO: crc check
+
+    call OneWire.release();
+    busy = FALSE;
+    return SUCCESS;
+  }
+}