discovery that cc2420 uses capture pin not connected on shimmer2

requires this interrupt-driven implementation of sfd capture.

diff --git a/tos/platforms/shimmer2/chips/cc2420/HplCC2420InterruptsP.nc b/tos/platforms/shimmer2/chips/cc2420/HplCC2420InterruptsP.nc
new file mode 100644 (file)
index 0000000..f08c1ab
--- /dev/null
+++ b/tos/platforms/shimmer2/chips/cc2420/HplCC2420InterruptsP.nc
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2010, Shimmer Research, Ltd.
+ * 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 Shimmer Research, Ltd. 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.
+ *
+ * @author Steve Ayer
+ * @date   January, 2010
+ *
+ * this implements an interrupt-driven capture interface for the cc2420
+ * tx-mode use of sfd.  shimmer2 does not have sfd routed to a timer pin
+ * on the msp430, so cc2420's capture mechanism fails.  
+ * this module will trigger a capture.captured event after receiving the
+ * appropriate interrupt from the shimmer2 sfd pin (1.0)
+ */
+
+module HplCC2420InterruptsP @safe() {
+  provides{
+    interface GpioCapture as CaptureSFD;
+  }
+
+  uses{
+    interface GpioInterrupt as InterruptSFD;
+    interface LocalTime<TMilli>;
+  }
+}
+
+implementation {
+  async command error_t CaptureSFD.captureRisingEdge() { 
+    call InterruptSFD.enableRisingEdge();
+    return SUCCESS;
+  }
+
+  async command error_t CaptureSFD.captureFallingEdge() { 
+    call InterruptSFD.enableFallingEdge();
+    return SUCCESS;
+  }
+  
+  async command void CaptureSFD.disable() {
+    call InterruptSFD.disable();
+  }
+
+  async event void InterruptSFD.fired() {
+    uint32_t t = call LocalTime.get();
+
+    signal CaptureSFD.captured((uint16_t)(t & 0x0000ffff));
+  }
+}
+