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keybrd/src/Scanner_IOE.cpp
2016-09-16 23:45:54 -06:00

44 lines
1.1 KiB
C++

#include "Scanner_IOE.h"
/* init() is called once for each row from Row constructor.
*/
void Scanner_IOE::init(const uint8_t strobePin)
{
//empty
}
/* begin() should be called once from sketch setup().
Initiates communication protocal and configs ports.
*/
void Scanner_IOE::begin()
{
refPortWrite.begin();
refPortRead.begin(strobeOn);
}
/* scan() is called on every iteration of sketch loop().
strobePin is bitwise, 1 means that row pin is active.
scan() strobes the row's strobePin and retuns state of port's input pins.
*/
read_pins_t Scanner_IOE::scan(const uint8_t strobePin)
{
uint8_t readState; //bitwise, 1 means key is pressed, 0 means released
//strobe on
refPortWrite.write(strobePin, strobeOn);
delayMicroseconds(3); //time to stabilize voltage
//delayMicroseconds(300); //todo
//read the port pins
readState = refPortRead.read();
//strobe off
refPortWrite.write(strobePin, strobeOff);
if (strobeOn == LOW) //if active low
{
readState = ~readState;
}
return readState;
}