Diff: RepeatButton.cpp

Revision:

0:8be79829ce90

diff -r 000000000000 -r 8be79829ce90 RepeatButton.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RepeatButton.cpp	Sun Feb 20 18:47:18 2011 +0000
@@ -0,0 +1,110 @@
+/* mbed RepeatButton Library
+ * Copyright (c) 2011 Jeroen Hilgers
+ *
+ * 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 "mbed.h"
+#include "RepeatButton.h"
+
+KeyBuffer::KeyBuffer(int size)
+{
+    // One byte cannot be used; if it were 
+    // used, the buffer empty condition
+    // mReadIndex == mWriteIndex would apply.
+    // So one byte extra is allocated. 
+    mBuffer = new uint8_t[size+1];
+    mSize = size+1;
+    mReadIndex = 0;
+    mWriteIndex = 0;
+}
+
+KeyBuffer::~KeyBuffer()
+{
+    delete mBuffer;
+}
+
+void KeyBuffer::Write(uint8_t value)
+{
+    int nextIndex = mWriteIndex + 1;
+    if(nextIndex >= mSize)
+        nextIndex = 0;
+    if(nextIndex == mReadIndex)
+    {
+        // Buffer full!
+        return;
+    }
+    mBuffer[mWriteIndex] = value;
+    mWriteIndex = nextIndex;
+}
+
+int KeyBuffer::Read()
+{
+    if(mReadIndex == mWriteIndex)
+    {
+        // Buffer empty!
+        return -1;
+    }
+    int value = mBuffer[mReadIndex];
+    int nextIndex = mReadIndex + 1;
+    if(nextIndex >= mSize)
+        nextIndex = 0;
+    mReadIndex = nextIndex;
+    return value;
+}
+
+
+RepeatButton::RepeatButton(PinName pin, int delay_ms, int period_ms, KeyBuffer *buf, char value) :
+    mIn(pin),
+    mIrq(pin) 
+{
+    mIn.mode(PullUp);
+    mValue = value;
+    mDelay = delay_ms * 1000;
+    mPeriod = period_ms * 1000;
+    mIrq.rise(this, &RepeatButton::OnChange);
+    mIrq.fall(this, &RepeatButton::OnChange);
+    mTarget = buf;
+}
+
+void RepeatButton::OnChange()
+{
+    // Any change on input. Wait 5ms to get rid of bounce and get reading afterwards.
+    mTimeout.attach_us(this, &RepeatButton::OnBounce, 5000);
+}
+
+void RepeatButton::OnBounce()
+{
+    if(mIn == 0)
+    {
+        // Key is still pressed. Generate first press.
+        mTimeout.attach_us(this, &RepeatButton::OnRepeat, mDelay);
+        mTarget->Write(mValue);
+    }
+}
+
+void RepeatButton::OnRepeat()
+{
+    if(mIn == 0)
+    {
+        // Key is still pressed. Generate repeated press.
+        mTimeout.attach_us(this, &RepeatButton::OnRepeat, mPeriod);
+        mTarget->Write(mValue);
+    }
+}
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