27 lines
870 B
C++
27 lines
870 B
C++
#include "PortRead_PCA9655E.h"
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/* begin() is called from Scanner_IOE::begin().
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Configures port to to read (input).
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*/
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void PortRead_PCA9655E::begin(const uint8_t strobeOn)
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{
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Wire.beginTransmission(port.DEVICE_ADDR);
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Wire.write(port.num + 6); //configuration byte command
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Wire.write(readPins); //0=output (for LED), 1=input (for read)
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Wire.endTransmission();
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}
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/* read() returns portState.
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Only portState bits of readPins are valid.
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*/
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uint8_t PortRead_PCA9655E::read()
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{
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Wire.beginTransmission(port.DEVICE_ADDR);
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Wire.write(port.num); //input byte command
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Wire.endTransmission(false); //PCA9655E needs false to send a restart
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Wire.requestFrom(port.DEVICE_ADDR, 1u); //request one byte from input port
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return Wire.read();
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}
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