tmicore and tmirws platforms -> tmimsp family

[tinyos-2.x.git] / tos / platforms / tmimsp / tmirws / chips / sht11 / OpenDrainP.nc

diff --git a/tos/platforms/tmimsp/tmirws/chips/sht11/OpenDrainP.nc b/tos/platforms/tmimsp/tmirws/chips/sht11/OpenDrainP.nc
new file mode 100644 (file)
index 0000000..9cc2246
--- /dev/null
+++ b/tos/platforms/tmimsp/tmirws/chips/sht11/OpenDrainP.nc
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2008, Titanium Mirror, Inc.
+ * 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 the Technische Universität Berlin 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+/**
+ * Implement an open drain output using a GeneralIO, represented as a
+ * GeneralIO.  clr() puts the pin in input mode, simulating open drain and
+ * therefore requiring a pull-up on the net.  set() puts the pin in output
+ * mode and sinks current by outputting a logic zero.  By definition, the
+ * pin wrapped by this component can only be used as an output.
+ *
+ * TODO: there could be a version of this component that uses the msp430's
+ * built-in pull-up resistor...
+ *
+ * @author R. Steve McKown <rsmckown@gmail.com>
+ */
+
+generic module OpenDrainP()
+{
+  provides {
+    interface Init;
+    interface GeneralIO;
+  }
+  uses interface GeneralIO as RawIO;
+}
+implementation
+{
+  command error_t Init.init()
+  {
+    call RawIO.clr();
+    call RawIO.makeInput();
+    return SUCCESS;
+  }
+
+  async command bool GeneralIO.get()
+  {
+    return call RawIO.get();
+  }
+
+  async command void GeneralIO.set()
+  {
+    call RawIO.makeInput();
+  }
+
+  async command void GeneralIO.clr()
+  {
+    call RawIO.makeOutput();
+  }
+
+  async command void GeneralIO.toggle()
+  {
+    if (call RawIO.isInput())
+      call RawIO.makeOutput();
+    else
+      call RawIO.makeInput();
+  }
+
+  async command void GeneralIO.makeInput() {}
+
+  async command void GeneralIO.makeOutput() {}
+
+  async command bool GeneralIO.isInput()
+  {
+    return FALSE;
+  }
+
+  async command bool GeneralIO.isOutput()
+  {
+    return TRUE;
+  }
+}
+