Library with address set to hardware pins
Diff: pcf8575.cpp
- Revision:
- 0:95cf83ce54ec
diff -r 000000000000 -r 95cf83ce54ec pcf8575.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/pcf8575.cpp Sat Sep 08 22:12:10 2012 +0000 @@ -0,0 +1,57 @@ +/* +* PCF8575 Remote 16-bit I/O expander for I2C-bus +* Copyright (c) 2012 Bas van Drunen Littel +* +* Permission is hereby granted, free of charge, to any person obtaining a copy +* of this software and associated documentation files (the "Software"), to deal +* in the Software without restriction, including without limitation the rights +* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +* copies of the Software, and to permit persons to whom the Software is +* furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included in +* all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +* THE SOFTWARE. +*/ + +#include "pcf8575.h" + +PCF8575::PCF8575(I2C* _interface, unsigned char _chipselect) + : i2c(_interface) +{ + address = (_chipselect << 1) | PCF8575_I2C_ADDRESS; +} + +PCF8575::~PCF8575() {} + +unsigned short PCF8575::ReadBytes() +{ + char data[2]; + i2c->read(address,data,2); + return (data[1]<<8) | data[0]; +} + +void PCF8575::WriteBytes(unsigned short bytes) +{ + char data[2]; + + data[0] = bytes & 0xFF; + data[1] = bytes>> 8; + i2c->write(address,data,2); +} + +void PCF8575::WriteBytes(unsigned char byte0, unsigned char byte1) +{ + char data[2]; + + data[0] = byte0; + data[1] = byte1; + i2c->write(address,data,2); +} \ No newline at end of file