Diff: pcf8574.cpp

Revision:

0:7913586369c2

diff -r 000000000000 -r 7913586369c2 pcf8574.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcf8574.cpp	Sat Sep 08 22:11:31 2012 +0000
@@ -0,0 +1,51 @@
+/*
+* PCF8574(A) Remote 8-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 "pcf8574.h"
+
+PCF8574::PCF8574(I2C* _interface, unsigned char _chipselect, bool _type)
+    : i2c(_interface)
+{
+    if (_type == PCF8574_TYPE) {
+        address = (_chipselect << 1) | PCF8574_I2C_ADDRESS;
+    } else {
+        address = (_chipselect << 1) | PCF8574A_I2C_ADDRESS;
+    }
+}
+
+PCF8574::~PCF8574() {}
+
+unsigned char PCF8574::ReadByte()
+{
+    char data[1];
+    i2c->read(address,data,1);
+    return data[0];
+}
+
+void PCF8574::WriteByte(unsigned char byte)
+{
+    unsigned char data[1];
+    
+    data[0]=byte;
+    i2c->write(address,(char *)data,1);
+}
\ No newline at end of file