Olivier Smeesters / KeyboardManager

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

Dependents:   KeyboardTest

KeyboardMonitor.cpp@2:eb4cc53ff33d, 2011-01-23 (annotated)

Committer:
osmeest
Date:
Sun Jan 23 23:15:36 2011 +0000
Revision:
2:eb4cc53ff33d
Child:
3:1310c57aca77
Thorough split of the code to have one responsibility per class. Generalisation of the keyboard layout (not limited to 4x4 anymore). Introduction of the kbd_mgr namespace (also apparent in header filenames).

Who changed what in which revision?

UserRevisionLine numberNew contents of line
osmeest 2:eb4cc53ff33d 1 #include "kbd_mgr/KeyboardMonitor.h"
osmeest 2:eb4cc53ff33d 2
osmeest 2:eb4cc53ff33d 3 namespace kbd_mgr {
osmeest 2:eb4cc53ff33d 4
osmeest 2:eb4cc53ff33d 5 KeyboardMonitor::KeyboardMonitor(PortName inPort, std::size_t numKeysPerRow, std::size_t inLowestBit,
osmeest 2:eb4cc53ff33d 6 const KeyboardMonitor::OutPinsSet &outPins, KeyboardStateHandler *handler) :
osmeest 2:eb4cc53ff33d 7 in(inPort, ((1 << numKeysPerRow)-1) << inLowestBit), inBitShift(inLowestBit), outPins(outPins), handler(handler),
osmeest 2:eb4cc53ff33d 8 ticker(), scanRow(0), currentState(outPins.size(), numKeysPerRow)
osmeest 2:eb4cc53ff33d 9 { }
osmeest 2:eb4cc53ff33d 10
osmeest 2:eb4cc53ff33d 11 void KeyboardMonitor::start(float pollingPeriod)
osmeest 2:eb4cc53ff33d 12 {
osmeest 2:eb4cc53ff33d 13 if (this->outPins.empty()) {
osmeest 2:eb4cc53ff33d 14 return;
osmeest 2:eb4cc53ff33d 15 }
osmeest 2:eb4cc53ff33d 16
osmeest 2:eb4cc53ff33d 17 if (pollingPeriod < 20e-6) {
osmeest 2:eb4cc53ff33d 18 pollingPeriod = 20e-6;
osmeest 2:eb4cc53ff33d 19 }
osmeest 2:eb4cc53ff33d 20
osmeest 2:eb4cc53ff33d 21 for(OutPinsSet::const_iterator p = this->outPins.begin(); p != this->outPins.end(); ++p) {
osmeest 2:eb4cc53ff33d 22 DigitalOut out(*p);
osmeest 2:eb4cc53ff33d 23 out.write( p == this->outPins.begin() ? 1 : 0 );
osmeest 2:eb4cc53ff33d 24 }
osmeest 2:eb4cc53ff33d 25 this->in.mode(PullDown);
osmeest 2:eb4cc53ff33d 26 this->scanRow = 0;
osmeest 2:eb4cc53ff33d 27 this->ticker.attach(this, &KeyboardMonitor::timerHandler, pollingPeriod);
osmeest 2:eb4cc53ff33d 28 }
osmeest 2:eb4cc53ff33d 29
osmeest 2:eb4cc53ff33d 30 void KeyboardMonitor::stop()
osmeest 2:eb4cc53ff33d 31 {
osmeest 2:eb4cc53ff33d 32 this->ticker.detach();
osmeest 2:eb4cc53ff33d 33 this->in.mode(OpenDrain);
osmeest 2:eb4cc53ff33d 34 }
osmeest 2:eb4cc53ff33d 35
osmeest 2:eb4cc53ff33d 36 void KeyboardMonitor::timerHandler()
osmeest 2:eb4cc53ff33d 37 {
osmeest 2:eb4cc53ff33d 38 DigitalOut out(this->outPins[this->scanRow]);
osmeest 2:eb4cc53ff33d 39 out.write(1);
osmeest 2:eb4cc53ff33d 40 wait_us(10);
osmeest 2:eb4cc53ff33d 41 int v = (this->in.read() >> this->inBitShift);
osmeest 2:eb4cc53ff33d 42 out.write(0);
osmeest 2:eb4cc53ff33d 43 this->currentState.setRowState(this->scanRow, v);
osmeest 2:eb4cc53ff33d 44 this->scanRow = (this->scanRow + 1) % this->currentState.getNumRows();
osmeest 2:eb4cc53ff33d 45 if (this->scanRow == 0) {
osmeest 2:eb4cc53ff33d 46 if (this->handler) {
osmeest 2:eb4cc53ff33d 47 (*this->handler)(this->currentState);
osmeest 2:eb4cc53ff33d 48 }
osmeest 2:eb4cc53ff33d 49 }
osmeest 2:eb4cc53ff33d 50 }
osmeest 2:eb4cc53ff33d 51
osmeest 2:eb4cc53ff33d 52 } // kbd_mgr