Diff: PwmReader.cpp

Revision:

0:15aa9d3aeb2e

Child:

1:ebc39fb22351

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmReader.cpp	Wed Jan 25 08:52:00 2017 +0000
@@ -0,0 +1,73 @@
+/*!
+ * PwmReader.cpp
+ *
+ * Read signal occupacy on a pin in a non blocking way using timer and interrupt
+ *
+ * Copyright (c) 2017 -  Alexandre Bouillot github.com/abouillot
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documnetation 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
+ * furished 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 OR 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 "PwmReader.h"
+
+
+void PwmReader::pressedInt()
+{
+    _high += _timer.read_us() - _last_toggle;
+    _last_toggle = _timer.read_us();
+//    _timer.reset();
+//    printf("p %ld ", _high);
+//    sleep();
+}
+
+void PwmReader::releasedInt()
+{
+    _down += _timer.read_us() - _last_toggle;
+    _last_toggle = _timer.read_us();
+//    _timer.reset();
+//    printf("r %ld", _down);
+//    sleep();
+}
+
+void PwmReader::init()
+{
+    _pin.fall(callback(this, &PwmReader::pressedInt));
+    _pin.rise(callback(this, &PwmReader::releasedInt));
+}
+
+void PwmReader::start()
+{
+    _high = 0;
+    _down = 0;
+    _start_state = _pin.read();
+    _pin.enable_irq();
+    _timer.start();
+}
+
+void PwmReader::stop()
+{
+    _pin.disable_irq();
+
+    if (_high == 0 && _down == 0)
+        if (_start_state == 0)
+            _high = _timer.read_us();
+        else if (_start_state == 1)
+            _down = _timer.read_us();
+    _timer.stop();
+}
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