Diff: PCF8574_EnableBus.h

Revision:

0:2467aed99127

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8574_EnableBus.h	Wed Aug 31 19:45:31 2011 +0000
@@ -0,0 +1,53 @@
+/* PCF8574_EnableBus - Use the PCF8574 I2C Port Extender for controlling the Chip Enable Bus
+ * Copyright (c) 2011 Wim Huiskamp
+ *
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * version 0.2 Initial Release
+*/
+#ifndef _PCF8574_ENABLEBUS_H
+#define _PCF8574_ENABLEBUS_H
+
+//Pin Defines for PCF8574 Enable Bus
+//Note: 'Reset' causes all devices on the 'Control & Display Unit' to be reset!
+#define D_CS_SWITCH            0x01
+#define D_LATCHEN_1            0x02
+#define D_LATCHEN_2            0x04
+#define D_CS_BRIGHT            0x08
+#define D_CS_DISP              0x10
+#define D_CS_SPARE             0x20
+#define D_RESET                0x40
+#define D_NOGO                 0x80
+
+#define D_ENABLE_MSK           0x3F
+
+//Enums for Enable Bus
+#include "BusEnums.h"
+enum CS_Pin { CS_SWITCH, LATCHEN_1, LATCHEN_2, CS_BRIGHT, CS_DISP, CS_SPARE };
+
+
+/** Create an PCF8574_EnableBus 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_EnableBus {
+public:
+    PCF8574_EnableBus(I2C &i2c, char deviceAddress);
+    void chipselect (CS_Pin cs_pin, Bit_Level cs_level);
+    void reset (Bit_Level rst_level);
+    void nogo (Bit_Level nogo_level);
+protected:
+    I2C &_i2c;
+    char _readOpcode;
+    char _writeOpcode; 
+    char _enable_bus;   
+    char _reset_pin;   
+    char _nogo_pin;   
+//    char _read();
+    void _write();  
+    void _write(char byte);      
+    void _init(); 
+};
+
+#endif
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