57 lines
1.1 KiB
C++
57 lines
1.1 KiB
C++
#include <Wire.h>
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#include "Pca9554.h"
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enum class Pca9554_Registers : uint8_t {
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INPUT_PORT = 0x00,
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OUTPUT_PORT = 0x01,
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POLARITY_INVERSION = 0x02,
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CONFIGURATION = 0x03,
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};
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Pca9554::Pca9554(uint8_t slaveAddress) :
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outputValues { 0 }, slaveAddress { slaveAddress }, inputMask { 0 }
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{
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}
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Pca9554::~Pca9554()
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{
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}
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void Pca9554::begin(uint8_t inputMask, uint8_t outputs)
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{
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SetInputPins(inputMask);
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SendOutputValues(outputValues = outputs);
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}
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void Pca9554::SetInputPins(uint8_t inputMask)
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{
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this->inputMask = inputMask;
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Wire.beginTransmission(slaveAddress | 0x00);
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Wire.write((uint8_t) Pca9554_Registers::CONFIGURATION);
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Wire.write(inputMask);
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Wire.endTransmission();
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}
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uint8_t Pca9554::ReadInputs()
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{
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Wire.beginTransmission(slaveAddress | 0x01);
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int result = Wire.read() & inputMask;
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Wire.endTransmission();
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return (uint8_t) result;
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}
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void Pca9554::SendOutputValues()
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{
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SendOutputValues(outputValues);
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}
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void Pca9554::SendOutputValues(uint8_t values)
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{
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Wire.beginTransmission(slaveAddress | 0x00);
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Wire.write((uint8_t) Pca9554_Registers::OUTPUT_PORT);
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Wire.write(values & ~inputMask);
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Wire.endTransmission();
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}
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