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