This library improves behaviour of push buttons. The automatic repeat is very convenient for e.g. entering time with up/down buttons. The library buffers presses, so no presses are missed.
Dependents: Thermostat_NucleoF401
RepeatButton.cpp
- Committer:
- hilgo
- Date:
- 2011-02-20
- Revision:
- 0:8be79829ce90
File content as of revision 0:8be79829ce90:
/* 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); } }