Diff: Pulse.cpp

Revision:

0:fb79a4637a64

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Pulse.cpp	Wed Jul 04 15:56:06 2012 +0000
@@ -0,0 +1,139 @@
+/* Copyright (c) 2012 Nick Ryder, University of Oxford
+ * nick.ryder@physics.ox.ac.uk
+ *
+ *  MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+ * and associated documentation files (the "Software"), to deal in the Software without restriction, 
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or 
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+ 
+ 
+#include "Pulse.h"
+
+PulseInOut::PulseInOut(PinName pin):
+        startval(0), pulsetime(), runtime(), io(pin)    {
+}
+
+
+PulseInOut::~PulseInOut() {
+}
+
+void PulseInOut::write(int val) {
+    io.output();
+    io = val;
+}
+
+void PulseInOut::write_us(int val, int time)   {
+    io.output();
+    io = val;
+    wait_us(time);
+    io = !val;
+}
+
+int PulseInOut::read_high_us()  {
+    pulsetime.reset();
+    io.input();
+    while (io == 1) {
+    }
+    while (io == 0) {
+    }
+    pulsetime.start();
+    while (io == 1) {
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
+
+int PulseInOut::read_high_us(int timeout)  {
+    runtime.reset();
+    runtime.start();
+    pulsetime.reset();
+    io.input();
+    while (io == 1) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    while (io == 0) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.start();
+    while (io == 1) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
+
+int PulseInOut::read_low_us()   {
+    pulsetime.reset();
+    io.input();
+    while (io == 0) {
+    }
+    while (io == 1) {
+    }
+    pulsetime.start();
+    while (io == 0) {
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
+
+int PulseInOut::read_low_us(int timeout)   {
+    runtime.reset();
+    runtime.start();
+    pulsetime.reset();
+    io.input();
+    while (io == 0) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    while (io == 1) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.start();
+    while (io == 0) {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
+
+int PulseInOut::read_us()  {
+    pulsetime.reset();
+    io.input();
+    startval = io;
+    while (io == startval)   {
+    }
+    pulsetime.start();
+    while (io != startval)  {
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
+
+int PulseInOut::read_us(int timeout)   {
+    runtime.reset();
+    runtime.start();
+    pulsetime.reset();
+    io.input();
+    startval = io;
+    while (io == startval)  {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.start();
+    while (io != startval)   {
+        if (runtime.read_us() > timeout)   return -1;
+    }
+    pulsetime.stop();
+    return pulsetime.read_us();
+}
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