Olivier Smeesters / KeyboardManager

KeyboardManager: a class to manage the polling of a switch-matrix keyboard

Dependents:   KeyboardTest

KeyboardMonitor.cpp@3:1310c57aca77, 2011-02-03 (annotated)

Committer:
osmeest
Date:
Thu Feb 03 22:01:57 2011 +0000
Revision:
3:1310c57aca77
Parent:
2:eb4cc53ff33d 
improve code structure, add key mapping and long key press handling

Who changed what in which revision?

UserRevisionLine numberNew contents of line
osmeest 3:1310c57aca77 1 #include "kbd_mgr/KeyboardMonitor.h"
osmeest 3:1310c57aca77 2
osmeest 3:1310c57aca77 3 namespace kbd_mgr {
osmeest 3:1310c57aca77 4
osmeest 3:1310c57aca77 5 KeyboardMonitor::KeyboardMonitor(PortName inPort, std::size_t numKeysPerRow, std::size_t inLowestBit,
osmeest 3:1310c57aca77 6 const KeyboardMonitor::OutPinsSet &outPins) :
osmeest 3:1310c57aca77 7 in(inPort, ((1 << numKeysPerRow)-1) << inLowestBit), inBitShift(inLowestBit), outPins(outPins),
osmeest 3:1310c57aca77 8 ticker(), scanRow(0), currentState(outPins.size(), numKeysPerRow)
osmeest 3:1310c57aca77 9 { }
osmeest 3:1310c57aca77 10
osmeest 3:1310c57aca77 11 KeyboardMonitor::~KeyboardMonitor()
osmeest 3:1310c57aca77 12 {
osmeest 3:1310c57aca77 13 stop();
osmeest 3:1310c57aca77 14 }
osmeest 3:1310c57aca77 15
osmeest 3:1310c57aca77 16 void KeyboardMonitor::start(float pollingPeriod)
osmeest 3:1310c57aca77 17 {
osmeest 3:1310c57aca77 18 if (this->outPins.empty()) {
osmeest 3:1310c57aca77 19 return;
osmeest 3:1310c57aca77 20 }
osmeest 3:1310c57aca77 21
osmeest 3:1310c57aca77 22 if (pollingPeriod < 20e-6) {
osmeest 3:1310c57aca77 23 pollingPeriod = 20e-6;
osmeest 3:1310c57aca77 24 }
osmeest 3:1310c57aca77 25
osmeest 3:1310c57aca77 26 for(OutPinsSet::const_iterator p = this->outPins.begin(); p != this->outPins.end(); ++p) {
osmeest 3:1310c57aca77 27 DigitalOut out(*p);
osmeest 3:1310c57aca77 28 out.write( p == this->outPins.begin() ? 1 : 0 );
osmeest 3:1310c57aca77 29 }
osmeest 3:1310c57aca77 30 this->in.mode(PullDown);
osmeest 3:1310c57aca77 31 this->scanRow = 0;
osmeest 3:1310c57aca77 32 this->ticker.attach(this, &KeyboardMonitor::timerHandler, pollingPeriod);
osmeest 3:1310c57aca77 33 }
osmeest 3:1310c57aca77 34
osmeest 3:1310c57aca77 35 void KeyboardMonitor::stop()
osmeest 3:1310c57aca77 36 {
osmeest 3:1310c57aca77 37 this->ticker.detach();
osmeest 3:1310c57aca77 38 this->in.mode(OpenDrain);
osmeest 3:1310c57aca77 39 }
osmeest 3:1310c57aca77 40
osmeest 3:1310c57aca77 41 void KeyboardMonitor::timerHandler()
osmeest 3:1310c57aca77 42 {
osmeest 3:1310c57aca77 43 DigitalOut out(this->outPins[this->scanRow]);
osmeest 3:1310c57aca77 44 out.write(1);
osmeest 3:1310c57aca77 45 wait_us(10);
osmeest 3:1310c57aca77 46 int v = (this->in.read() >> this->inBitShift);
osmeest 3:1310c57aca77 47 out.write(0);
osmeest 3:1310c57aca77 48 this->currentState.setRowState(this->scanRow, v);
osmeest 3:1310c57aca77 49 this->scanRow = (this->scanRow + 1) % this->currentState.getNumRows();
osmeest 3:1310c57aca77 50 if (this->scanRow == 0) {
osmeest 3:1310c57aca77 51 invokeHandler(this->currentState);
osmeest 3:1310c57aca77 52 }
osmeest 3:1310c57aca77 53 }
osmeest 3:1310c57aca77 54
osmeest 3:1310c57aca77 55 } // kbd_mgr