55 rader
1.4 KiB
C++
55 rader
1.4 KiB
C++
#include "Scanner_IOE.h"
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/* init() is called once for each row from Row constructor.
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*/
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void Scanner_IOE::init(const uint8_t strobePin)
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{
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//empty
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}
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/* begin() should be called once from sketch setup().
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Initiates communication protocal and configs ports.
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*/
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void Scanner_IOE::begin()
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{
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refPortWrite.beginProtocol();
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refPortWrite.begin(activeState);
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refPortRead.begin(activeState);
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}
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/* scan() is called on every iteration of sketch loop().
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strobePin is a bit pattern, 1 means that row pin is active.
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scan() strobes the row's strobePin and retuns state of port's input pins.
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*/
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read_pins_t Scanner_IOE::scan(const uint8_t strobePin)
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{
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uint8_t readState; //bits, 1 means key is pressed, 0 means released
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//strobe on
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if (activeState == LOW) //if active low
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{
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refPortWrite.writeLow(strobePin);
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}
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else //if active high
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{
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refPortWrite.writeHigh(strobePin);
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}
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delayMicroseconds(3); //time to stabilize voltage
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//read the port pins
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readState = refPortRead.read();
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//strobe off
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if (activeState == LOW) //if active low
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{
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refPortWrite.writeHigh(strobePin);
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readState = ~readState;
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}
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else //if active high
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{
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refPortWrite.writeLow(strobePin);
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}
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return readState;
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}
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