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rename Port_MCP23018 to Port_MCP23017, Port_MCP23018 inherits everything from Port_MCP23017

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This commit is contained in:
wolfv6 2016-11-16 07:23:00 -07:00
parent cf3e582e25
commit df4abb3808
4 changed files with 83 additions and 62 deletions
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7
examples/keybrd_MCP23017/keybrd_MCP23017.ino
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@ -60,7 +60,8 @@ DESTINATION PIN PIN_NUMBER PIN DESTINATION
#include <Scanner_uC.h>
//right matrix
#include <Port_MCP23018.h>
#include <Port_MCP23017.h>
//#include <Port_MCP23018.h>
#include <Scanner_IOE.h>
// ============ SPEED CONFIGURATION ============
@ -77,8 +78,8 @@ Scanner_uC scanner_L(LOW, readPins, readPinCount);
// =============== RIGHT SCANNER ===============
const uint8_t IOE_ADDR = 0x20; //MCP23018 ADDR pin grounded
Port_MCP23018 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //read pins 0, 1
Port_MCP23018 portB(IOE_ADDR, 1, 0);
Port_MCP23017 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //read pins 0, 1
Port_MCP23017 portB(IOE_ADDR, 1, 0);
Scanner_IOE scanner_R(LOW, portB, portA);
// ================= RIGHT LED =================

16
src/Port_MCP23018.cpp → src/Port_MCP23017.cpp
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@ -1,13 +1,13 @@
#include "Port_MCP23018.h"
#include "Port_MCP23017.h"
/* beginProtocol() is called from Scanner_IOE::begin(). Initiates I2C bus.
MCP23018 supports I2C SCL Clock Frequencies: 100 kHz, 400 kHz, 1000 kHz (Datasheet page 1 & 6)
MCP23017 supports I2C SCL Clock Frequencies: 100 kHz, 400 kHz, 1000 kHz (Datasheet page 1 & 6)
The electrical limitation to bus speed is bus capacitance and the length of the wires involved.
Longer wires require lower clock speeds.
http://playground.arduino.cc/Main/WireLibraryDetailedReference > Wire.setclock()
*/
void Port_MCP23018::beginProtocol()
void Port_MCP23017::beginProtocol()
{
Wire.begin(); //initiate I2C bus to 100 kHz
}
@ -15,7 +15,7 @@ void Port_MCP23018::beginProtocol()
/* begin() is called from Scanner_IOE::begin().
Configures port's IODIR and GPPU.
*/
void Port_MCP23018::begin(const uint8_t activeState)
void Port_MCP23017::begin(const uint8_t activeState)
{
uint8_t pullUp; //bits, GPPU 0=pull-up disabled, 1=pull-up enabled
@ -42,7 +42,7 @@ void Port_MCP23018::begin(const uint8_t activeState)
/* writeLow() sets pin output LOW.
pin is bit pattern, where pin being set is 1.
*/
void Port_MCP23018::writeLow(const uint8_t pin)
void Port_MCP23017::writeLow(const uint8_t pin)
{
outputVal &= ~pin; //set pin output to low
@ -55,7 +55,7 @@ void Port_MCP23018::writeLow(const uint8_t pin)
/* writeHigh() sets pin output HIGH.
pin is bit pattern, where pin being set is 1.
*/
void Port_MCP23018::writeHigh(const uint8_t pin)
void Port_MCP23017::writeHigh(const uint8_t pin)
{
outputVal |= pin; //set pin output to high
@ -68,11 +68,11 @@ void Port_MCP23018::writeHigh(const uint8_t pin)
/* read() returns portState.
Only portState bits of readPins are valid.
*/
uint8_t Port_MCP23018::read()
uint8_t Port_MCP23017::read()
{
Wire.beginTransmission(deviceAddr);
Wire.write(portNum + 0x12); //GPIO
Wire.endTransmission(false); //MCP23018 needs false to send a restart ??really?
Wire.endTransmission(false); //MCP23017 needs false to send a restart ??todo really?
Wire.requestFrom(deviceAddr, 1u); //request one byte from input port

41
src/Port_MCP23017.h Normal file
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@ -0,0 +1,41 @@
#ifndef PORT_MCP23017_H
#define PORT_MCP23017_H
#include <Arduino.h>
#include <inttypes.h>
#include <Wire.h>
#include <PortInterface.h>
/*
write pins are connected to matrix Row (strobe pin) or LED.
readPins are connected to matrix column to read which keys are pressed.
Instantiation
------------
Example instantiation:
const uint8_t IOE_ADDR = 0x20; //all three MCP23017 ADDR pins pins grounded
Port_MCP23017 portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs
Port_MCP23017 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //pin 0 and pin 1 are set to input for reading,
//remaining pins can be used for LEDs
Diode orientation
----------------
Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation
*/
class Port_MCP23017 : public PortInterface
{
private:
const uint8_t deviceAddr;
const uint8_t portNum; //port identification number, 0=A, 1=B
uint8_t outputVal; //bit pattern for strobe and LEDs
const uint8_t readPins; //bit pattern, IODIR 0=output, 1=input
public:
Port_MCP23017(const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins)
: deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
void beginProtocol();
void begin(const uint8_t activeState);
virtual void writeLow(const uint8_t pin);
virtual void writeHigh(const uint8_t pin);
virtual uint8_t read();
};
#endif

81
src/Port_MCP23018.h
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@ -1,51 +1,30 @@
#ifndef PORT_MCP23018_H
#define PORT_MCP23018_H
#include <Arduino.h>
#include <inttypes.h>
#include <Wire.h>
#include <PortInterface.h>
/*
write pins are connected to matrix Row (strobe pin) or LED.
readPins are connected to matrix column to read which keys are pressed.
Port_MCP23018 can only be active low (Scanner_IOE::activeState = LOW).
Open-drain active high would not work because pull down resistors have no effect on sink.
https://en.wikipedia.org/wiki/Open_collector
Use LED_PortOpenDrain class for indicator LEDs.
Instantiation
------------
Example instantiation:
const uint8_t IOE_ADDR = 0x20; //MCP23018 address pin grounded
Port_MCP23018 portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs
Port_MCP23018 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //pin 0 and pin 1 are set to input for reading,
//remaining pins can be used for LEDs
Diode orientation
----------------
Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation
MCP23018 data sheet
----------------
http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf
*/
class Port_MCP23018 : public PortInterface
{
private:
const uint8_t deviceAddr;
const uint8_t portNum; //port identification number, 0=A, 1=B
uint8_t outputVal; //bit pattern for strobe and LEDs
const uint8_t readPins; //bit pattern, IODIR 0=output, 1=input
public:
Port_MCP23018(const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins)
: deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
void beginProtocol();
void begin(const uint8_t activeState);
virtual void writeLow(const uint8_t pin);
virtual void writeHigh(const uint8_t pin);
virtual uint8_t read();
};
#endif
#ifndef PORT_MCP23018_H
#define PORT_MCP23018_H
#include "Port_MCP23017.h"
/*
write pins are connected to matrix Row (strobe pin) or LED.
readPins are connected to matrix column to read which keys are pressed.
Port_MCP23018 can only be active low (Scanner_IOE::activeState = LOW).
Open-drain active high would not work because pull down resistors have no effect on sink.
https://en.wikipedia.org/wiki/Open_collector
Use LED_PortOpenDrain class for indicator LEDs.
Example instantiation:
const uint8_t IOE_ADDR = 0x20; //MCP23018 address pin grounded
Port_MCP23018 portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs
Port_MCP23018 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //pin 0 and pin 1 are set to input for reading,
//remaining pins can be used for LEDs
Diode orientation
----------------
Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation
*/
class Port_MCP23018 : public Port_MCP23017
{
public:
Port_MCP23018(const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins)
: Port_MCP23017(deviceAddr, portNum, readPins) {}
};
#endif