Diff: pcf8575.cpp

Revision:

0:95cf83ce54ec

--- /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