45 lines
818 B
C++
45 lines
818 B
C++
#include "RowScanner_Arduino.h"
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/*
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Strobes the row and reads the columns.
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*/
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uint8_t RowScanner_Arduino::scan(uint16_t& rowEnd)
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{
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uint8_t rowState = 0;
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uint8_t col = 1;
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//strobe row on
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if (activeHigh)
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{
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digitalWrite(strobePin, HIGH);
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}
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else //activeLow
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{
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digitalWrite(strobePin, LOW);
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}
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delayMicroseconds(3); //time to stablize voltage
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//read all the column ports
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for (uint8_t i=0; i < READ_PIN_COUNT; i++)
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{
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if ( digitalRead(readPins[i]) == activeHigh )
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{
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rowState |= col;
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}
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col <<= 1;
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}
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//strobe row off
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if (activeHigh)
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{
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digitalWrite(strobePin, LOW);
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}
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else //activeLow
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{
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digitalWrite(strobePin, HIGH);
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}
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rowEnd = col;
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return rowState;
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}
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