51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
#ifndef PORT_PCA9655E_H
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#define PORT_PCA9655E_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 "PortInterface.h"
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/* Port_PCA9655E
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write pins are connected to matrix Row (strobe pin) or LED.
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readPins are connected to matrix column to read which keys are pressed.
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Be careful with the deviceAddr.
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Table 6 in PCA9655E datasheet lists 8-bit versions of I2C addresses.
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The Arduino Wire library uses 7-bit addresses throughout, so drop the low bit.
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For example, I2C address with AD2=GND AD1=SCL AD0=SCL,
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Table 6 lists 8-bit DEVICE_ADDR = 0x30 (b 00110000)
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while Arduino uses 7-bit DEVICE_ADDR = 0x18 (b 00011000)
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http://playground.arduino.cc/Main/WireLibraryDetailedReference
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Instantiation
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------------
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Example instantiation:
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const uint8_t IOE_ADDR = 0x20; //PCA9655E address, all 3 ADDR pins are grounded
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Port_PCA9655E portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs
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Port_PCA9655E portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //pin 0 and pin 1 are set to input for reading,
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//remaining pins can be used for LEDs
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Diode orientation
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----------------
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Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation
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*/
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class Port_PCA9655E : public PortInterface
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{
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private:
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const uint8_t deviceAddr;
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const uint8_t portNum; //port identification number
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uint8_t outputVal; //bit pattern for strobe and LEDs
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const uint8_t readPins; //bit pattern, IODIR 0=output, 1=input
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public:
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Port_PCA9655E(const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins)
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: deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
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void beginProtocol();
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void begin(const uint8_t activeState);
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virtual void writeLow(const uint8_t pin);
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virtual void writeHigh(const uint8_t pin);
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virtual uint8_t read();
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};
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#endif
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