Library with address set to hardware pins

Files at this revision

API Documentation at this revision

Comitter:
Bas
Date:
Sat Sep 08 22:12:10 2012 +0000
Commit message:
Name changes in WriteBytes

Changed in this revision

pcf8575.cpp Show annotated file Show diff for this revision Revisions of this file
pcf8575.h Show annotated file Show diff for this revision Revisions of this file
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
diff -r 000000000000 -r 95cf83ce54ec pcf8575.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcf8575.h	Sat Sep 08 22:12:10 2012 +0000
@@ -0,0 +1,45 @@
+/*
+* 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.
+*/
+#ifndef __PCF8575_H
+#define __PCF8575_H
+
+#define VERSION 1.0
+
+#include <mbed.h>
+
+#define PCF8575_I2C_ADDRESS     0x40
+
+class PCF8575 {
+public:
+    PCF8575(I2C* _interface, unsigned char _chipselect);
+    ~PCF8575(void);
+    
+    unsigned short ReadBytes(void);
+    void WriteBytes(unsigned short bytes);
+    void WriteBytes(unsigned char byte0, unsigned char byte1);
+    
+private:
+    I2C* i2c; // Communication interface
+    unsigned char address; //I2C address
+};
+#endif
\ No newline at end of file