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Add begin() method #27

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Merged
merged 3 commits into from
Jun 4, 2022
Merged

Add begin() method #27

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f8e4e34
Add begin() method usual for Arduino driver libs and the supporting c…
dok-net May 28, 2022
6e15eed
Begin without address argument shall use the ctor provided address, n…
dok-net May 31, 2022
d5de9de
Apply suggestions from code review
dok-net Jun 2, 2022
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16 changes: 16 additions & 0 deletions src/MCP23017.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,11 @@ MCP23017::MCP23017(uint8_t address, TwoWire& bus) {
_bus = &bus;
}

MCP23017::MCP23017(TwoWire& bus) {
_deviceAddr = MCP23017_I2C_ADDRESS;
_bus = &bus;
}

MCP23017::~MCP23017() {}

void MCP23017::init()
Expand All @@ -25,6 +30,17 @@ void MCP23017::init()
writeRegister(MCP23017Register::GPPU_A, 0xFF, 0xFF);
}

void MCP23017::begin()
{
init();
}

void MCP23017::begin(uint8_t address)
{
_deviceAddr = address;
begin();
}

void MCP23017::portMode(MCP23017Port port, uint8_t directions, uint8_t pullups, uint8_t inverted)
{
writeRegister(MCP23017Register::IODIR_A + port, directions);
Expand Down
17 changes: 16 additions & 1 deletion src/MCP23017.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
#include <Arduino.h>
#include <Wire.h>

#define MCP23017_I2C_ADDRESS 0x20 ///< The default I2C address of MCP23017.
#define _MCP23017_INTERRUPT_SUPPORT_ ///< Enables support for MCP23017 interrupts.

enum class MCP23017Port : uint8_t
Expand Down Expand Up @@ -65,10 +66,24 @@ class MCP23017
* Instantiates a new instance to interact with a MCP23017 at the specified address.
*/
MCP23017(uint8_t address, TwoWire& bus = Wire);
/**
* Instantiates a new instance to interact with a MCP23017 at the
* MCP23017_I2C_ADDRESS default.
*/
MCP23017(TwoWire& bus = Wire);
~MCP23017();
#ifdef _DEBUG
void debug();
#endif
/**
* Uses the I2C address set during construction. Implicitly calls init().
*/
void begin();
/**
* Overrides the I2C address set by the constructor. Implicitly calls begin().

*/
void begin(uint8_t address);
/**
* Initializes the chip with the default configuration.
* Enables Byte mode (IOCON.BANK = 0 and IOCON.SEQOP = 1).
Expand Down Expand Up @@ -221,4 +236,4 @@ class MCP23017
void clearInterrupts(uint8_t& portA, uint8_t& portB);

#endif
};
};