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Add support for Wire library for ESP-01 #13

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Add support for Wire library for ESP-01 #13

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20 changes: 17 additions & 3 deletions Adafruit_MCP23017.cpp
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
/***************************************************
/***************************************************
This is a library for the MCP23017 i2c port expander

These displays use I2C to communicate, 2 pins are required to
Expand Down Expand Up @@ -124,6 +124,22 @@ void Adafruit_MCP23017::begin(uint8_t addr) {
writeRegister(MCP23017_IODIRB,0xff);
}

#ifdef ESP8266
void Adafruit_MCP23017::begin(uint8_t addr, uint8_t sda, uint8_t sdc) {
if (addr > 7) {
addr = 7;
}
i2caddr = addr;

Wire.begin(sda, sdc);

// set defaults!
// all inputs on port A and B
writeRegister(MCP23017_IODIRA,0xff);
writeRegister(MCP23017_IODIRB,0xff);
}
#endif

/**
* Initializes the default MCP23017, with 000 for the configurable part of the address
*/
Expand Down Expand Up @@ -287,5 +303,3 @@ uint8_t Adafruit_MCP23017::getLastInterruptPinValue(){

return MCP23017_INT_ERR;
}


13 changes: 8 additions & 5 deletions Adafruit_MCP23017.h
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Original file line number Diff line number Diff line change
@@ -1,13 +1,13 @@
/***************************************************
/***************************************************
This is a library for the MCP23017 i2c port expander

These displays use I2C to communicate, 2 pins are required to
These displays use I2C to communicate, 2 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/

Expand All @@ -24,6 +24,9 @@
class Adafruit_MCP23017 {
public:
void begin(uint8_t addr);
#ifdef ESP8266
void begin(uint8_t addr, uint8_t sda, uint8_t sdc);
#endif
void begin(void);

void pinMode(uint8_t p, uint8_t d);
Expand Down