34 lines
1.3 KiB
C
34 lines
1.3 KiB
C
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#ifndef SCANNER_PORT_H
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#define SCANNER_PORT_H
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#include <Arduino.h>
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#include <inttypes.h>
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#include <Wire.h>
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#include <ScannerInterface.h>
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#include <PortWriteInterface.h>
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#include <PortReadInterface.h>
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/* Scanner_IOE uses bit manipulation to read all pins of one port.
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The ports are normally from an I/O Expander, but could also be ports from an AVR uC.
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The maximum keys per row is 8, because ports have a maximum of 8 pins each.
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keybrd_library_developer_guide.md has instructions for ## Active state and diode orientation
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*/
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class Scanner_IOE : public ScannerInterface
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{
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private:
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const bool strobeOn; //logic level of strobe on, HIGH or LOW
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const bool strobeOff; //logic level of strobe off, complement of strobeOn
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PortWriteInterface& refPortWrite; //the IC port containing the strobePin
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PortReadInterface& refPortRead; //the IC's read port
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public:
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Scanner_IOE(const bool strobeOn,
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PortWriteInterface &refPortWrite, PortReadInterface& refPortRead)
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: strobeOn(strobeOn), strobeOff(!strobeOn),
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refPortWrite(refPortWrite), refPortRead(refPortRead) {}
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void init(const uint8_t strobePin);
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void begin();
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uint8_t scan(const uint8_t strobePin);
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};
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#endif
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