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| Original file line number | Diff line number | Diff line change |
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| // --------------------------------------------------------------------------- | ||
| // Created by Francisco Malpartida on 20/08/11. | ||
| // Copyright 2011 - Under creative commons license 3.0: | ||
| // Attribution-ShareAlike CC BY-SA | ||
| // | ||
| // This software is furnished "as is", without technical support, and with no | ||
| // warranty, express or implied, as to its usefulness for any purpose. | ||
| // | ||
| // Thread Safe: No | ||
| // Extendable: Yes | ||
| // | ||
| // @file I2CIO.h | ||
| // This file implements a basic IO library using the PCF8574 I2C IO Expander | ||
| // chip. | ||
| // | ||
| // @brief | ||
| // Implement a basic IO library to drive the PCF8574* I2C IO Expander ASIC. | ||
| // The library implements basic IO general methods to configure IO pin direction | ||
| // read and write uint8_t operations and basic pin level routines to set or read | ||
| // a particular IO port. | ||
| // | ||
| // | ||
| // @version API 1.0.0 | ||
| // | ||
| // @author F. Malpartida - fmalpartida@gmail.com | ||
| // --------------------------------------------------------------------------- | ||
| #if (ARDUINO < 100) | ||
| #include <WProgram.h> | ||
| #else | ||
| #include <Arduino.h> | ||
| #endif | ||
|
|
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| #include <inttypes.h> | ||
|
|
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| #include "./Wire.h" | ||
| #include "./I2CIO.h" | ||
|
|
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| // CLASS VARIABLES | ||
| // --------------------------------------------------------------------------- | ||
|
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|
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| // CONSTRUCTOR | ||
| // --------------------------------------------------------------------------- | ||
| I2CIO::I2CIO ( ) | ||
| { | ||
| _i2cAddr = 0x0; | ||
| _dirMask = 0xFF; // mark all as INPUTs | ||
| _shadow = 0x0; // no values set | ||
| _initialised = false; | ||
| } | ||
|
|
||
| // PUBLIC METHODS | ||
| // --------------------------------------------------------------------------- | ||
|
|
||
| // | ||
| // begin | ||
| int I2CIO::begin ( uint8_t i2cAddr ) | ||
| { | ||
| _i2cAddr = i2cAddr; | ||
|
|
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| Wire.begin ( ); | ||
|
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| _initialised = Wire.requestFrom ( _i2cAddr, (uint8_t)1 ); | ||
|
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| #if (ARDUINO < 100) | ||
| _shadow = Wire.receive (); | ||
| #else | ||
| _shadow = Wire.read (); // Remove the byte read don't need it. | ||
| #endif | ||
|
|
||
| return ( _initialised ); | ||
| } | ||
|
|
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| // | ||
| // pinMode | ||
| void I2CIO::pinMode ( uint8_t pin, uint8_t dir ) | ||
| { | ||
| if ( _initialised ) | ||
| { | ||
| if ( OUTPUT == dir ) | ||
| { | ||
| _dirMask &= ~( 1 << pin ); | ||
| } | ||
| else | ||
| { | ||
| _dirMask |= ( 1 << pin ); | ||
| } | ||
| } | ||
| } | ||
|
|
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| // | ||
| // portMode | ||
| void I2CIO::portMode ( uint8_t dir ) | ||
| { | ||
|
|
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| if ( _initialised ) | ||
| { | ||
| if ( dir == INPUT ) | ||
| { | ||
| _dirMask = 0xFF; | ||
| } | ||
| else | ||
| { | ||
| _dirMask = 0x00; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // | ||
| // read | ||
| uint8_t I2CIO::read ( void ) | ||
| { | ||
| uint8_t retVal = 0; | ||
|
|
||
| if ( _initialised ) | ||
| { | ||
| Wire.requestFrom ( _i2cAddr, (uint8_t)1 ); | ||
| #if (ARDUINO < 100) | ||
| retVal = ( _dirMask & Wire.receive ( ) ); | ||
| #else | ||
| retVal = ( _dirMask & Wire.read ( ) ); | ||
| #endif | ||
|
|
||
| } | ||
| return ( retVal ); | ||
| } | ||
|
|
||
| // | ||
| // write | ||
| int I2CIO::write ( uint8_t value ) | ||
| { | ||
| int status = 0; | ||
|
|
||
| if ( _initialised ) | ||
| { | ||
| // Only write HIGH the values of the ports that have been initialised as | ||
| // outputs updating the output shadow of the device | ||
| _shadow = ( value & ~(_dirMask) ); | ||
|
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||
| Wire.beginTransmission ( _i2cAddr ); | ||
| #if (ARDUINO < 100) | ||
| Wire.send ( _shadow ); | ||
| #else | ||
| Wire.write ( _shadow ); | ||
| #endif | ||
| status = Wire.endTransmission (); | ||
| } | ||
| return ( (status == 0) ); | ||
| } | ||
|
|
||
| // | ||
| // digitalRead | ||
| uint8_t I2CIO::digitalRead ( uint8_t pin ) | ||
| { | ||
| uint8_t pinVal = 0; | ||
|
|
||
| // Check if initialised and that the pin is within range of the device | ||
| // ------------------------------------------------------------------- | ||
| if ( ( _initialised ) && ( pin <= 7 ) ) | ||
| { | ||
| // Remove the values which are not inputs and get the value of the pin | ||
| pinVal = this->read() & _dirMask; | ||
| pinVal = ( pinVal >> pin ) & 0x01; // Get the pin value | ||
| } | ||
| return (pinVal); | ||
| } | ||
|
|
||
| // | ||
| // digitalWrite | ||
| int I2CIO::digitalWrite ( uint8_t pin, uint8_t level ) | ||
| { | ||
| uint8_t writeVal; | ||
| int status = 0; | ||
|
|
||
| // Check if initialised and that the pin is within range of the device | ||
| // ------------------------------------------------------------------- | ||
| if ( ( _initialised ) && ( pin <= 7 ) ) | ||
| { | ||
| // Only write to HIGH the port if the port has been configured as | ||
| // an OUTPUT pin. Add the new state of the pin to the shadow | ||
| writeVal = ( 1 << pin ) & ~_dirMask; | ||
| if ( level == HIGH ) | ||
| { | ||
| _shadow |= writeVal; | ||
|
|
||
| } | ||
| else | ||
| { | ||
| _shadow &= ~writeVal; | ||
| } | ||
| status = this->write ( _shadow ); | ||
| } | ||
| return ( status ); | ||
| } | ||
|
|
||
| // | ||
| // PRIVATE METHODS | ||
| // --------------------------------------------------------------------------- |
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