Revision 0:fb79a4637a64, committed 2012-07-04

Comitter:

NickRyder

Date:

Wed Jul 04 15:56:06 2012 +0000

Commit message:

Released under MIT license.

Changed in this revision

--- /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();
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Pulse.h	Wed Jul 04 15:56:06 2012 +0000
@@ -0,0 +1,73 @@
+/* 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.
+ */
+ 
+#ifndef MBED_PULSE_H
+#define MBED_PULSE_H
+
+#include "mbed.h"
+
+/** Pulse Input/Output Class(es)
+ */
+ 
+class PulseInOut   {
+    public:
+        /** Create a PulseInOut object connected to the specified pin
+        * @param pin i/o pin to connect to
+        */
+        PulseInOut(PinName);
+        ~PulseInOut();
+        /** Set the value of the pin
+        * @param val Value to set, 0 for LOW, otherwise HIGH
+        */
+        void write(int val);
+        /** Send a pulse of a given value for a specified time
+        * @param val Value to set, 0 for LOW, otherwise HIGH
+        * @param time Length of pulse in microseconds
+        */
+        void write_us(int val, int time);
+        /** Return the length of the next HIGH pulse in microsconds
+        */
+        int read_high_us();
+        /** Return the length of the next HIGH pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_high_us(int timeout);
+        /** Return the length of the next LOW pulse in microsconds
+        */
+        int read_low_us();
+        /** Return the length of the next LOW pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_low_us(int timeout);
+        /** Return the length of the next pulse in microsconds
+        */
+        int read_us();
+        /** Return the length of the next pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_us(int timeout);
+    private:
+        int startval;
+        Timer pulsetime, runtime;
+        DigitalInOut io;
+};
+
+#endif
\ No newline at end of file