Added support for pulling the SDA and SCL pins low on I2C 2 on Mulle when they are...

[tinyos-2.x.git] / tos / platforms / mulle / chips / ds2782 / DS2782InternalP.nc

diff --git a/tos/platforms/mulle/chips/ds2782/DS2782InternalP.nc b/tos/platforms/mulle/chips/ds2782/DS2782InternalP.nc
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+++ b/tos/platforms/mulle/chips/ds2782/DS2782InternalP.nc
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+/*
+ * Copyright (c) 2009 Communication Group and Eislab at
+ * Lulea University of Technology
+ *
+ * Contact: Laurynas Riliskis, LTU
+ * Mail: laurynas.riliskis@ltu.se
+ * All rights reserved.
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the
+ *   distribution.
+ * - Neither the name of Communication Group at Lulea University of Technology
+ *   nor the names of its contributors may be used to endorse or promote
+ *    products derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL STANFORD
+ * UNIVERSITY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * The DS2782 only goes to sleep if SDA and SCL are pulled low.
+ * So everytime the default owner of the resource becomes the
+ * owner of the I2C bus the pins are pulled low.
+ * 
+ * @author Henrik Makitaavola <henrik.makitaavola@gmail.com>
+ */
+module DS2782InternalP
+{
+  uses interface ResourceDefaultOwner;
+  uses interface GeneralIO as SDA;
+  uses interface GeneralIO as SCL;
+}
+implementation
+{
+  async event void ResourceDefaultOwner.granted()
+  {
+    call SDA.clr();
+    call SDA.makeOutput();
+    call SCL.clr();
+    call SCL.makeOutput();
+  }
+
+  async event void ResourceDefaultOwner.requested()
+  {
+    call ResourceDefaultOwner.release();
+  }
+
+  async event void ResourceDefaultOwner.immediateRequested()
+  {
+    call ResourceDefaultOwner.release();
+  }
+}