Diff: TxIR.cpp

Revision:

0:7d2088337345

Child:

2:cc8371213c85

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TxIR.cpp	Sun Dec 12 05:36:26 2010 +0000
@@ -0,0 +1,78 @@
+
+/******************************************************************************
+ * Low level infrared transmission
+ * This library provides a low level interface to send IR commands. in principle
+ * other higher level IR type remotes could be build on top of this. I wrote
+ * this code to send IR commands to a Nikon camera, which it works rather well
+ * for. 
+ *
+ * Copyright (C) 2010 Ali Saidi
+ * 
+ * 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 "TxIR.hpp"
+ 
+
+void
+TxIR::doAction()
+{
+    if (pos >= len) {
+        delete [] data;
+        _inUse = false;
+        txPin.write(0);
+        return;
+    }
+        
+    delay.attach_us(this, &TxIR::doAction, data[pos++]);
+    if (high)
+        txPin.write(0);
+    else
+        txPin.write(0.5);
+   high = !high;
+}
+
+bool
+TxIR::txSeq(unsigned freq, unsigned _len, const unsigned *_data) 
+{
+    // @todo a lock or semaphore should be used here
+    if (inUse())
+        return false;
+    _inUse = true;
+    
+    // keep a copy of the data, so it can't change
+    len = _len;
+    data = new unsigned[len];
+    memcpy(data, _data, len * sizeof(unsigned));
+    pos = 0;
+    
+    // setup the PWM
+    txPin.write(0.0);
+    txPin.period_us(freq);
+    
+    // Get the interrupt ready
+    delay.detach();
+    high = true;
+    delay.attach_us(this, &TxIR::doAction, data[pos++]);
+    
+    // Begin
+    txPin.write(0.5);
+    
+    return true;
+}