add begin() and pullUp to PortRead_MCP23S17
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doc
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tutorials
unit_tests/PortRead_MCP23S17
@ -186,6 +186,8 @@ Most derived-class names start with the base class name followed by "_" and a na
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This convention leads to class names that convey information about the classes inheritance.
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This convention leads to class names that convey information about the classes inheritance.
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Underscore delineates base class name and sub-class name. Capital letters delineate words.
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Underscore delineates base class name and sub-class name. Capital letters delineate words.
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Interface class names end with "Interface".
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Layer-class naming conventions
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Layer-class naming conventions
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------------------------------
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------------------------------
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Layer classes are explained in [tutorial_3a_multi-layer_keyboard.md](../tutorials/tutorial_3a_multi-layer_keyboard.md).
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Layer classes are explained in [tutorial_3a_multi-layer_keyboard.md](../tutorials/tutorial_3a_multi-layer_keyboard.md).
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@ -4,20 +4,42 @@
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PortRead_MCP23S17::begin() is not needed because port direction is already configured to input by default.
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PortRead_MCP23S17::begin() is not needed because port direction is already configured to input by default.
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SPI bus is configured in PortWrite_MCP23S17::begin().
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SPI bus is configured in PortWrite_MCP23S17::begin().
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*/
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*/
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void PortRead_MCP23S17::begin()
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{
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pinMode(SS, OUTPUT); //configure controller's Slave Select pin to output
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digitalWrite(SS, HIGH); //disable Slave Select
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SPI.begin();
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SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus todo is slow clock needed?
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digitalWrite(SS, LOW); //enable Slave Select
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SPI.transfer(port.ADDR << 1); //write command
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SPI.transfer(port.num); //configure IODIR
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SPI.transfer(pullUp); //0=output (for LED), 1=input (for read)
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digitalWrite(SS, LOW); //enable Slave Select
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digitalWrite(SS, HIGH); //disable Slave Select
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SPI.transfer(port.ADDR << 1); //write command
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SPI.transfer(port.num + 0x0C); //configure GPPU
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SPI.transfer(pullUp); //0=pull-up disabled (for LED), 1=pull-up enabled (for read)
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digitalWrite(SS, HIGH); //disable Slave Select
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//SPI.endTransaction() is not called to release the SPI bus
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// because keyboard only has one SPI device.
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}
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/*
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/*
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returns port value
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read() returns portState.
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*/
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*/
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uint8_t PortRead_MCP23S17::read()
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uint8_t PortRead_MCP23S17::read()
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{
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{
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uint8_t portState; //bit wise
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uint8_t portState; //bit wise
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//slower clock
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digitalWrite(SS, LOW); //enable Slave Select
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digitalWrite(SS, LOW); //enable Slave Select
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SPI.transfer(port.ADDR << 1 | 1); //read command
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SPI.transfer(port.ADDR << 1 | 1); //read command
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SPI.transfer(port.num + 0x12); //GPIO register address to read data from
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SPI.transfer(port.num + 0x12); //register address to read data from
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portState = SPI.transfer(0); //save the data (0 is dummy data to send)
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portState = SPI.transfer(0); //save the data (0 is dummy data to send)
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digitalWrite(SS, HIGH); //disable Slave Select
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digitalWrite(SS, HIGH); //disable Slave Select
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return portState;
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return portState;
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}
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}
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@ -7,11 +7,10 @@
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#include "PortIOE.h"
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#include "PortIOE.h"
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/* One MCP23S17 I/O expander port connected to matrix columns.
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/* One MCP23S17 I/O expander port connected to matrix columns.
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MCP23S17 does not have internal pull-up resistors (PCA9535E does).
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Instantiation
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Instantiation todo
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------------
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------------
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readPins parameter is port's bitwise pin configuration
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pullUp parameter is port's bitwise pin configuration
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1=configure as input (for pins connected to column)
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1=configure as input (for pins connected to column)
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0=configure as output (for LED or not connected to a column)
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0=configure as output (for LED or not connected to a column)
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@ -22,18 +21,17 @@ Example instantiation for column port 1, with pins 2 and 3 connected to columns:
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PortIOE port1(1, 0);
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PortIOE port1(1, 0);
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PortRead_MCP23S17 colPort1(port1, 2<<0 | 1<<3 );
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PortRead_MCP23S17 colPort1(port1, 2<<0 | 1<<3 );
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readPins are read from pin 0 on up.
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pullUp are read from pin 0 on up.
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*/
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*/
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class PortRead_MCP23S17 : public PortRead
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class PortRead_MCP23S17 : public PortRead
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{
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{
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private:
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private:
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PortIOE& port;
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PortIOE& port;
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const uint8_t pullUp; //bitwise, 1 means internal pull-up resistor enabled
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public:
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public:
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/*
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PortRead_MCP23S17(PortIOE& port, const uint8_t pullUp) : port(port), pullUp(pullUp) {}
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*/
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void begin();
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//The constructor initialization list is in .cpp
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PortRead_MCP23S17(PortIOE& port) : port(port) {}
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virtual uint8_t read();
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virtual uint8_t read();
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};
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};
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#endif
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#endif
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@ -1,32 +1,31 @@
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#include "PortWrite_MCP23S17.h"
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#include "PortWrite_MCP23S17.h"
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/* writePort() sets registerAddr to data.
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*/
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void PortWrite_MCP23S17::writePort(const uint8_t registerAddr, const uint8_t data)
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void PortWrite_MCP23S17::writePort(const uint8_t registerAddr, const uint8_t data)
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{
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{
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//slower clock
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digitalWrite(SS, LOW); //enable Slave Select
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//SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus todo move to begin()
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SPI.transfer(port.ADDR << 1); //write command
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digitalWrite(SS, LOW); //enable Slave Select
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SPI.transfer(registerAddr); //register address to write data to
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SPI.transfer(port.ADDR << 1); //write command
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SPI.transfer(data); //data
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SPI.transfer(registerAddr); //register address to write data to
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digitalWrite(SS, HIGH); //disable Slave Select
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SPI.transfer(data); //data
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digitalWrite(SS, HIGH); //disable Slave Select
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//SPI.endTransaction(); //release the SPI bus
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}
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}
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/*
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/* begin() should be called once from sketch in setup().
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If PortRead_MCP23S17 is instantiated on the same port, do NOT use PortWrite_MCP23S17::begin().
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PortRead_MCP23S17 and PortWrite_MCP23S17 should be on seperate ports on the same MCP23S17.
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Otherwise readPins could be overwritten.
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Output pins can be used for strobe pins and LEDs.
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Output pins can be used for strobe pins and LEDs.
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SPI.endTransaction() is not called because keyboard only has one SPI device, so no need to release the SPI bus
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*/
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*/
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void PortWrite_MCP23S17::begin()
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void PortWrite_MCP23S17::begin()
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{
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{
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pinMode(SS, OUTPUT); //configure controller's Slave Select pin to output
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pinMode(SS, OUTPUT); //configure controller's Slave Select pin to output
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digitalWrite(SS, HIGH); //disable Slave Select
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digitalWrite(SS, HIGH); //disable Slave Select
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SPI.begin();
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SPI.begin();
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SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus
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SPI.beginTransaction(SPISettings (SPI_CLOCK_DIV8, MSBFIRST, SPI_MODE0)); //control SPI bus todo is slow clock needed?
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writePort(port.num, 0); //configure port direction (port.num) to output (0)
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writePort(port.num, 0); //configure port direction (port.num) to output (0)
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//SPI.endTransaction() is not called to release the SPI bus
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// because keyboard only has one SPI device.
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}
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}
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/*
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/*
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@ -16,7 +16,7 @@ To write a new Port class:
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Write very simple read and write examples for your I/O expander.
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Write very simple read and write examples for your I/O expander.
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Simple SPI I/O expander examples:
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Simple SPI I/O expander examples:
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todo link, pictures
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todo link, pictures
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/home/wolfv/Documents/Arduino/demo/IOE_MCP23S17_read/
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/home/wolfv/Documents/Arduino/demo/IOE_MCP23S17_read/ todo internal pull-up resistors
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/home/wolfv/Documents/Arduino/demo/IOE_MCP23S17_write/
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/home/wolfv/Documents/Arduino/demo/IOE_MCP23S17_write/
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Simple I2C I/O expander examples:
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Simple I2C I/O expander examples:
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todo link, pictures
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todo link, pictures
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@ -9,24 +9,22 @@ http://arduino.stackexchange.com/questions/28792/reading-an-mcp23s17-i-o-expande
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*/
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*/
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#include "PortIOE.h"
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#include "PortIOE.h"
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#include "PortRead_MCP23S17.h"
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#include "PortRead_MCP23S17.h"
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#include "PortWrite_MCP23S17.h"
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const uint8_t PortIOE::ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded
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const uint8_t PortIOE::ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded
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PortIOE portB(1, 0);
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PortIOE portB(1, 0);
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PortRead_MCP23S17 portBRead(portB);
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PortRead_MCP23S17 portBRead(portB, ~0);
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PortWrite_MCP23S17 portBWrite(portB); //PortBWrite needed for begin()
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void setup()
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void setup()
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{
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{
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uint8_t portBState; //bit wise
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uint8_t portBState; //bit wise
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delay(6000);
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delay(6000);
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portBWrite.begin();
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portBRead.begin();
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portBState = portBRead.read();
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portBState = portBRead.read();
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Keyboard.print("portBState = ");
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Keyboard.print("portBState = ");
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Keyboard.println(portBState, BIN); //should print 10101010
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Keyboard.println(portBState, BIN); //prints 10101010
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}
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}
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void loop() { }
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void loop() { }
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