@@ -5,7 +5,7 @@ | |||
#include <Wire.h> | |||
#include <PortInterface.h> | |||
/* | |||
/* Port_MCP23017 | |||
write pins are connected to matrix Row (strobe pin) or LED. | |||
readPins are connected to matrix column to read which keys are pressed. | |||
@@ -1,7 +1,8 @@ | |||
#ifndef PORT_MCP23018_H | |||
#define PORT_MCP23018_H | |||
#include "Port_MCP23017.h" | |||
/* | |||
/* Port_MCP23018 | |||
write pins are connected to matrix Row (strobe pin) or LED. | |||
readPins are connected to matrix column to read which keys are pressed. | |||
@@ -5,7 +5,7 @@ | |||
#include <SPI.h> | |||
#include <PortInterface.h> | |||
/* | |||
/* Port_MCP23S17 | |||
write pins are connected to matrix Row (strobe pin) or LED. | |||
readPins are connected to matrix column to read which keys are pressed. | |||
@@ -0,0 +1,31 @@ | |||
#ifndef PORT_MCP23S18_H | |||
#define PORT_MCP23S18_H | |||
#include "Port_MCP23S17.h" | |||
/* Port_MCP23S18 has not been tested. | |||
write pins are connected to matrix Row (strobe pin) or LED. | |||
readPins are connected to matrix column to read which keys are pressed. | |||
Port_MCP23S18 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; //MCP23S18 address pin grounded | |||
Port_MCP23S18 portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs | |||
Port_MCP23S18 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_MCP23S18 : public Port_MCP23S17 | |||
{ | |||
public: | |||
Port_MCP23S18(const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins) | |||
: Port_MCP23S17(deviceAddr, portNum, readPins) {} | |||
}; | |||
#endif |
@@ -5,7 +5,7 @@ | |||
#include <Wire.h> | |||
#include <PortInterface.h> | |||
/* | |||
/* Port_PCA9655E | |||
write pins are connected to matrix Row (strobe pin) or LED. | |||
readPins are connected to matrix column to read which keys are pressed. | |||
@@ -29,9 +29,6 @@ Diode orientation | |||
---------------- | |||
Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation | |||
PCA9655E data sheet | |||
---------------- | |||
http://www.onsemi.com/pub_link/Collateral/PCA9655E-D.PDF | |||
*/ | |||
class Port_PCA9655E : public PortInterface |