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