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keybrd/src/RowPort_MCP23018.cpp
2016-05-09 08:05:08 -06:00

47 lines
1.2 KiB
C++

#include "RowPort_MCP23018.h"
/*
configures column port's IODIR, GPIO.
*/
RowPort_MCP23018::RowPort_MCP23018(IOExpanderPort& port)
: port(port), IODIR(port.num), GPIO(port.num + 0x12)
{}
void RowPort_MCP23018::begin()
{
//Wire.begin() should only be called once https://www.arduino.cc/en/Reference/WireBegin
#ifndef WIRE_BEGIN
#define WIRE_BEGIN
Wire.begin();
#endif
Wire.beginTransmission(port.ADDR);
Wire.write(IODIR);
Wire.write(0); //0=configure as output (for strobe pins and LED pins)
Wire.endTransmission();
}
/*
sets activePin pin output to low.
activePin is port mask, where active-low pin is 1.
*/
void RowPort_MCP23018::setActivePinLow(const uint8_t activePin)
{
Wire.beginTransmission(port.ADDR);
Wire.write(GPIO);
Wire.write(port.outputVal &= ~activePin);
Wire.endTransmission();
}
/*
sets activePin pin output to high, does not reset the other pins because they might be used by LEDs.
activePin is port mask, where active-high pin is 1.
*/
void RowPort_MCP23018::setActivePinHigh(const uint8_t activePin)
{
Wire.beginTransmission(port.ADDR);
Wire.write(GPIO);
Wire.write(port.outputVal |= activePin);
Wire.endTransmission();
}