uint8_t UserInput::KeyboardRead(MenuContext& status)
{
//shift last readings
cPB[0]=cPB[1];
cPB[1]=cPB[2];
cPB[2]= sampleButtons(&sample);
//3 scans for debounce
if ((cPB[0]==cPB[1]) && (cPB[0]==cPB[2]))
{
if (cScanCode != cPB[2])
{
status.setContextBits(PB_DELTA);
cScanCode = cPB[2];
}
}
//here there is a key press or key release
if (status.getContext() & PB_DELTA)
{
status.clrContextBits(PB_DELTA);
//clear the calling flag
//and start the timer with the initial period, i.e. for the 1st 1 sec nothing happens
status.setTimer(T_KEYBOARD_REPEAT, TYPEMATIC_INITIAL);
status.setKeyboardIncrement(1); //inititlise the increment
//(it can be 1, 10, 100, & 1000 & 10000)
cKeyboardLoopCounter = 1;
//number of loops before the KeyboardIncrement is incremented
status.setContextBits(KEYBOARD_VALID);
status.setTimer(T_KEYBOARD_TIMEOUT, KEYBOARD_TIMEOUT);
//refresh timer
//table defined scanCode to KeyCode translation
if (bitRead(cScanCode,0)) {
cKeyboardCode = K_NOUSE;
} else if (bitRead(cScanCode,1)) {
cKeyboardCode = K_OK;
} else if (bitRead(cScanCode,2)) {
cKeyboardCode = K_UP;
} else if (bitRead(cScanCode,3)) {
cKeyboardCode = K_DOWN;
} else if (bitRead(cScanCode,4)) {
cKeyboardCode = K_RIGHT;
} else if (bitRead(cScanCode,5)) {
cKeyboardCode = K_LEFT;
} else {
cKeyboardCode = 0x00;
status.clrContextBits(KEYBOARD_VALID);
//not a valid code
}
} else {
//key hold, check for typematic increases
if (((cKeyboardCode==K_UP) || (cKeyboardCode==K_DOWN)) && (cScanCode != IDLE_SCAN))
{//only if up or down
if (status.getTimer(T_KEYBOARD_REPEAT) == 0)
{// only when time is up
cKeyboardLoopCounter++;
if (cKeyboardLoopCounter > TYPEMATIC_STEP)
{
cKeyboardLoopCounter = 1;
status.raiseKeyboardIncrement();
}
status.setTimer(T_KEYBOARD_REPEAT, TYPEMATIC);
status.setContextBits(KEYBOARD_VALID);
}
}
}
status.setKeyboardCode(cKeyboardCode);
return cKeyboardCode;
}
