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keybrd/src/Row.cpp

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#include "Row.h"
/* constructor
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init() is called once for each row, to set scanner's uC strobePin to output.
*/
Row::Row(ScannerInterface& refScanner, const uint8_t strobePin,
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Key* const ptrsKeys[], const uint8_t keyCount)
: refScanner(refScanner), strobePin(strobePin),
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ptrsKeys(ptrsKeys), keyCount(keyCount), debounced(0)
{
refScanner.init(strobePin);
}
/* process() scans the row and calls any newly pressed or released keys.
Bitwise variables are 1 bit per key.
*/
void Row::process()
{
read_pins_t readState; //bitwise, 1 means key is pressed, 0 means released
read_pins_t debouncedChanged; //bitwise, 1 means debounced changed
readState = refScanner.scan(strobePin);
debouncedChanged = debouncer.debounce(readState, debounced);
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send(keyCount, debouncedChanged);
}
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/*
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send() calls key's press() or release() function if key was pressed or released.
Parameter debouncedChanged is bitwise.
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*/
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void Row::send(const uint8_t keyCount, const read_pins_t debouncedChanged)
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{
read_pins_t isFallingEdge; //bitwise, 1 means falling edge
read_pins_t isRisingEdge; //bitwise, 1 means rising edge
read_pins_t readPosition; //bitwise, active bit is 1
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uint8_t i; //index for ptrsKeys[i] array
//bit=1 if last debounced changed from 1 to 0, else bit=0
isFallingEdge = debouncedChanged & ~debounced;
//bit=1 if last debounced changed from 0 to 1, else bit=0
isRisingEdge = debouncedChanged & debounced;
for (readPosition=1, i=0; i < keyCount; readPosition<<=1, i++) //for each key in row
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{
//release before press avoids impossible key sequence
if (readPosition & isFallingEdge) //if key was released
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{
ptrsKeys[i]->release();
}
if (readPosition & isRisingEdge) //if key was pressed
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{
ptrsKeys[i]->press();
keyWasPressed();
}
}
}
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void Row::keyWasPressed()
{
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//empty in Row class. To unstick sticky keys, override keyWasPressed() in derived Row class.
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}