Diff: PCF8574_AddressBus.h

Revision:

2:1dab1089c332

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8574_AddressBus.h	Sat Aug 20 12:49:44 2011 +0000
@@ -0,0 +1,41 @@
+/* PCF8574_AddressBus - Use the PCF8574 I2C Port Extender for controlling the Address Bus
+ * Copyright (c) 2011 Wim Huiskamp
+ *
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * version 0.2 Initial Release
+*/
+#ifndef _PCF8574_ADDRESSBUS_H
+#define _PCF8574_ADDRESSBUS_H
+
+
+//Pin Defines for PCF8574 Address Bus
+#define D_A0                   0x01
+#define D_A1                   0x02
+#define D_A2                   0x04
+#define D_A3                   0x08
+#define D_A4                   0x10
+#define D_A5                   0x20
+#define D_A6                   0x40
+#define D_A7                   0x80
+
+#define D_ADDR_MSK             0x3F
+
+
+/** Create an PCF8574_AddressBus object connected to the specified I2C object and using the specified deviceAddress
+ *
+ * @param I2C &i2c the I2C port to connect to 
+ * @param char deviceAddress the address of the PCF8574
+*/
+class PCF8574_AddressBus {
+public:
+    PCF8574_AddressBus(I2C &i2c, char deviceAddress);
+    void write(char address);
+protected:
+    I2C &_i2c;
+    char _readOpcode;
+    char _writeOpcode; 
+    void _init(); 
+};
+
+#endif
\ No newline at end of file