60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
#include "Row_IOE.h"
|
|
|
|
void Row_IOE::process()
|
|
{
|
|
//these variables are all bitwise, one bit per key
|
|
uint8_t rowState; //1 means pressed, 0 means released
|
|
//read_pins_mask_t rowEnd; //1 bit marks positioned after last key of row
|
|
uint8_t debouncedChanged; //1 means debounced changed
|
|
ColPort* ptrColPort; //new
|
|
uint8_t KEY_COUNT; //new
|
|
|
|
ptrColPort = scanner.scan();
|
|
rowState = getRowState(ptrColPort, KEY_COUNT); //new
|
|
debouncedChanged = debouncer.debounce(rowState, debounced);
|
|
pressRelease(KEY_COUNT, debouncedChanged);
|
|
}
|
|
|
|
/*
|
|
Copies column pins to rowState. Unused column pins are not copied.
|
|
Sets rowEnd and returns rowState.
|
|
rowEnd is a bitwise row mask, one col per bit, where active col bit is 1.
|
|
At end of function, 1 bit marks place immediatly after last key of row.
|
|
rowEnd is a larger type than portMask so that it can not overflow.
|
|
*/
|
|
uint8_t Row_IOE::getRowState(ColPort* ptrColPort, uint8_t& KEY_COUNT)
|
|
{
|
|
uint8_t rowState = 0; //bitwise, one key per bit, 1 means key is pressed
|
|
uint8_t portMask; //bitwise, 1 bit is a colPortState position
|
|
uint8_t rowEnd; //1 bit marks positioned after last key of row todo rename
|
|
|
|
KEY_COUNT = 0;
|
|
|
|
//bitwise colPins, 1 means pin is connected to column
|
|
uint8_t colPins = ptrColPort->getColPins();
|
|
|
|
//bitwise colPortState, pin values where set in ColPort::read(), get them now
|
|
uint8_t colPortState = ptrColPort->getPortState();
|
|
|
|
/*if (activeHigh) //'activeHigh' was not declared in this scope
|
|
{
|
|
colPortState = ~colPortState; //todo configure IOE polarity to take care of this
|
|
}*/
|
|
|
|
for ( portMask = 1; portMask > 0; portMask <<= 1 ) //shift portMask until overflow
|
|
{ //for each pin of col port
|
|
if (portMask & colPins) //if pin is connected to column
|
|
{
|
|
if (portMask & ~colPortState) //if pin detected a key press
|
|
{
|
|
rowState |= rowEnd; //set rowState bit for that key
|
|
}
|
|
|
|
rowEnd <<= 1; //shift rowEnd to next key
|
|
KEY_COUNT++;
|
|
}
|
|
}
|
|
|
|
return rowState;
|
|
}
|