Revision 7:8680b8b718c8, committed 2015-01-25

Comitter:

wim

Date:

Sun Jan 25 17:52:55 2015 +0000

Parent:

6:aaefa04f06be

Commit message:

Test of PCF8574 Bus interface to control HDSP253X Smart Alphanumeric LED matrix display.

Changed in this revision

diff -r aaefa04f06be -r 8680b8b718c8 BusDefines.h
--- a/BusDefines.h	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,38 +0,0 @@
-/* BusDefines - Use the MBED Port pins and PCF8574s for controlling the Bus
- * Copyright (c) 2011 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#ifndef _BUS_DEFINES_H
-#define _BUS_DEFINES_H
-
-
-//Pin Defines for MBED Control Bus (inputs)
-#define D_CDINT                p20
-//Pin Defines for MBED Control Bus (outputs)
-#define D_DTR                  p21
-#define D_CDBUF                p22
-#define D_RD                   p23
-#define D_WR                   p24
-
-#define D_CTRL_MSK             0xFF
-
-//Pin Defines for I2C Bus
-//#define D_SDA                  p9
-//#define D_SCL                  p10
-#define D_SDA                  p28
-#define D_SCL                  p27
-
-//I2C Bus Address Defines for PCF8574 slaves
-#define D_I2C_DATA_BUS        0x40
-#define D_I2C_ADDR_BUS        0x42
-#define D_I2C_ENA_BUS         0x44
-
-
-//Host PC Baudrate (Virtual Com Port on USB)
-#define D_BAUDRATE            9600
-//#define D_BAUDRATE            57600
-
-#endif
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 BusEnums.h
--- a/BusEnums.h	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,17 +0,0 @@
-/* BusEnums - Use the MBED Port pins and PCF8574s for controlling the Bus
- * Copyright (c) 2011 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#ifndef _BUS_ENUMS_H
-#define _BUS_ENUMS_H
-
-//Enums for Control Bus and Enable Bus
-enum Bit_Level { LOW, HIGH };
-enum Bus_Dir   { READ, WRITE };
-enum Bus_Ena   { ENABLE, DISABLE };
-
-
-#endif
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_AddressBus.cpp
--- a/PCF8574_AddressBus.cpp	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,40 +0,0 @@
-/* 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
-*/
-#include "mbed.h"
-#include "PCF8574_AddressBus.h"
-
-/** 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
-*/
-PCF8574_AddressBus::PCF8574_AddressBus(I2C &i2c, char deviceAddress) : _i2c(i2c) {
-   _writeOpcode = deviceAddress & 0xFE; // low order bit = 0 for write
-   _readOpcode  = deviceAddress | 0x01; // low order bit = 1 for read
-   _init();
-}
-
-/** Optimised AddressBus write operation.
- * @param address the addressvalue to output on the bus
-*/
-void PCF8574_AddressBus::write(char address) {
-    char data[1];
-    
-    data[0] = address;
-    _i2c.write(_writeOpcode, data, 1);    // Write addressvalue to bus   
-}
-
-
-/** Init PCF8574_AddressBus
- * @param
- * @returns 
- */
-void PCF8574_AddressBus::_init() {
- 
-    write(0x00);
-}
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_AddressBus.h
--- a/PCF8574_AddressBus.h	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,41 +0,0 @@
-/* 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

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_Bus.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8574_Bus.lib	Sun Jan 25 17:52:55 2015 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/wim/code/PCF8574_Bus/#12207c70f4ea

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_DataBus.cpp
--- a/PCF8574_DataBus.cpp	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,75 +0,0 @@
-/* PCF8574_DataBus - Use the PCF8574 I2C Port Extender for controlling the Data Bus
- * Copyright (c) 2011 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#include "mbed.h"
-#include "PCF8574_DataBus.h"
-
-/** Create an PCF8574_DataBus 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
-*/
-PCF8574_DataBus::PCF8574_DataBus(I2C &i2c, char deviceAddress) : _i2c(i2c) {
-   _writeOpcode = deviceAddress & 0xFE; // low order bit = 0 for write
-   _readOpcode  = deviceAddress | 0x01; // low order bit = 1 for read
-   _init();
-}
-
-/** Optimised DataBus write operation.
- * @param byte the datavalue to output on the bus
-*/
-void PCF8574_DataBus::write(char byte) {
-    char data[1];
-    
-    data[0] = byte;
-    _i2c.write(_writeOpcode, data, 1);    // Write datavalue to bus   
-}
-
-/** Optimised DataBus read operation.
- *
- * @returns current data from Databus 
-*/
-char PCF8574_DataBus::read() {
-    char data[1];
-
-//Make sure that databus is enabled for Read
-//    data[0] = 0xFF;                       // Init Port for datainput by Writing 0xFF 
-//   _i2c.write(_writeOpcode, data, 1);    // Write to bus   
-    
-    _i2c.read(_readOpcode, data, 1);      // Read data from bus
-     
-   return data[0];
-}
-
-
-/** Enable databus for Write or Read
- *
- * @param Bus_Dir bus_dir
-*/
-void PCF8574_DataBus::busdir (Bus_Dir bus_dir) {
-
-    if (bus_dir == READ) {
-      // Make sure that databus is enabled for READ
-      write(0xFF);                          // Init Port as input by Writing 0xFF 
-            
-    }                
-    else {
-      // Make sure that databus is enabled for WRITE   
-      write(0xFF);                          // Not really needed, just Init Port to safe settings
-    }      
-}
-
-
-
-/** Init PCF8574_DataBus
- * @param
- * @returns 
- */
-void PCF8574_DataBus::_init() {
- 
-    busdir(WRITE);                          // Init Port as output 
-}
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_DataBus.h
--- a/PCF8574_DataBus.h	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,45 +0,0 @@
-/* PCF8574_DataBus - Use the PCF8574 I2C Port Extender for controlling the Data Bus
- * Copyright (c) 2011 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#ifndef _PCF8574_DATABUS_H
-#define _PCF8574_DATABUS_H
-
-//Pin Defines for PCF8574 Data Bus
-#define D_D0                   0x01
-#define D_D1                   0x02
-#define D_D2                   0x04
-#define D_D3                   0x08
-#define D_D4                   0x10
-#define D_D5                   0x20
-#define D_D6                   0x40
-#define D_D7                   0x80
-
-#define D_DATA_MSK             0xFF
-
-//Enums for Data Bus
-#include "BusEnums.h"
-
-
-/** Create an PCF8574_DataBus 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_DataBus {
-public:
-    PCF8574_DataBus(I2C &i2c, char deviceAddress);
-    char read();
-    void write(char byte);
-    void busdir (Bus_Dir bus_dir);    
-protected:
-    I2C &_i2c;
-    char _readOpcode;
-    char _writeOpcode; 
-    void _init(); 
-};
-
-#endif
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_EnableBus.cpp
--- a/PCF8574_EnableBus.cpp	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,130 +0,0 @@
-/* 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
-*/
-#include "mbed.h"
-#include "PCF8574_EnableBus.h"
-
-
-/** 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
-*/
-PCF8574_EnableBus::PCF8574_EnableBus(I2C &i2c, char deviceAddress) : _i2c(i2c) {
-   _writeOpcode = deviceAddress & 0xFE; // low order bit = 0 for write
-   _readOpcode  = deviceAddress | 0x01; // low order bit = 1 for read
-   _init();
-}
-
-
-/** Set or Reset Chip Select pins on Enable Bus
- *
- * @param CS_Pin cs_pin 
- * @param Bit_Level cs_level
-*/
-void PCF8574_EnableBus::chipselect (CS_Pin cs_pin, Bit_Level cs_level) {
-    int result = 1;
-      
-    switch (cs_pin) {
-     case CS_SWITCH : if (cs_level == LOW)
-                         _enable_bus = ~D_CS_SWITCH; // CS Pin Low, make sure that only one CS is active
-                      else
-                         _enable_bus |= D_CS_SWITCH; // CS Pin High
-                      break;
-     case LATCHEN_1 : if (cs_level == LOW)
-                         _enable_bus = ~D_LATCHEN_1; // CS Pin Low, make sure that only one CS is active
-                      else
-                         _enable_bus |= D_LATCHEN_1; // CS Pin High
-                      break;
-     case LATCHEN_2 : if (cs_level == LOW)
-                         _enable_bus = ~D_LATCHEN_2; // CS Pin Low, make sure that only one CS is active
-                      else
-                         _enable_bus |= D_LATCHEN_2; // CS Pin High
-                      break;
-     case CS_BRIGHT : if (cs_level == LOW)
-                         _enable_bus = ~D_CS_BRIGHT; // CS Pin Low, make sure that only one CS is active
-                      else
-                         _enable_bus |= D_CS_BRIGHT; // CS Pin High
-                      break;
-     case CS_DISP : if (cs_level == LOW)
-                         _enable_bus = ~D_CS_DISP;   // CS Pin Low, make sure that only one CS is active
-                      else
-                         _enable_bus |= D_CS_DISP;   // CS Pin High
-                      break;
-     
-     default:          // Oops, we should never end up here....
-                      result = -1;
-    }
-
-    _write();                              // Write chip enable bits to bus
-}
-
-/** Set or Clear the Reset pin on Enable Bus
- *
- * @param Bit_Level rst_level
-*/
-void PCF8574_EnableBus::reset (Bit_Level rst_level) {
-
-    if (rst_level == LOW) {
-        _reset_pin = 0x00;                 // Reset Pin Low
-      }               
-    else {
-        _reset_pin = D_RESET;              // Reset Pin High
-    }     
-    
-    _write();                              // Write RST bit to bus
-}
- 
-               
-/** Set or Clear the NoGo pin on Enable Bus
- *
- * @param Bit_Level nogo_level
-*/
-void PCF8574_EnableBus::nogo (Bit_Level nogo_level) {
-
-    if (nogo_level == LOW) {
-        _nogo_pin = 0x00;                  // NOGO Pin Low
-      }               
-    else {
-        _nogo_pin = D_NOGO;                // NOGO Pin High
-    }     
-    
-    _write();                              // Write NoGo bit to bus
-}
- 
-
-/** Optimised EnableBus write operation.
- * @param byte the value to output on the bus
-*/
-void PCF8574_EnableBus::_write(char byte) {
-    char data[1];
-    
-    data[0] = byte;
-    _i2c.write(_writeOpcode, data, 1);    // Write value to bus   
-}
-
-/** Optimised EnableBus write operation.
- * @param 
-*/
-void PCF8574_EnableBus::_write() {
-    char data[1];
-    
-    data[0] = (_enable_bus & D_ENABLE_MSK) | _reset_pin | _nogo_pin;      // Combine enable bits and control bits
-    _i2c.write(_writeOpcode, data, 1);    // Write value to bus   
-}
-
-
-/** Init PCF8574_EnableBus
- * @param
- * @returns 
- */
-void PCF8574_EnableBus::_init() {
-    _enable_bus = 0xFF;                    // Make sure that all CS pins are disabled
-    _reset_pin  = D_RESET;                 // Make sure that Reset pin is disabled
-    _nogo_pin   = D_NOGO;                  // Make sure that NoGo pin is disabled    
-    _write();                              // Write value to bus    
-}
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 PCF8574_EnableBus.h
--- a/PCF8574_EnableBus.h	Sun Jan 25 17:30:47 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,53 +0,0 @@
-/* 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
\ No newline at end of file

diff -r aaefa04f06be -r 8680b8b718c8 main.cpp.orig
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp.orig	Sun Jan 25 17:52:55 2015 +0000
@@ -0,0 +1,363 @@
+/* mbed bus - Main
+ * Copyright (c) 2011 Wim Huiskamp
+ *
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * version 0.2 Initial Release
+*/
+#include "mbed.h"
+#include "BusDefines.h"
+#include "PCF8574_DataBus.h"
+#include "PCF8574_AddressBus.h"
+#include "PCF8574_EnableBus.h"
+#include "MBED_ControlBus.h"
+#include "HDSP253X.h"
+  
+// Debug stuff
+#define __DEBUG  
+#include "Dbg.h"
+
+// mbed Interface Hardware definitions
+DigitalOut myled1(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut heartbeatLED(LED4);
+
+// Host PC Communication channels
+Serial pc(USBTX, USBRX);
+
+//I2C Bus
+I2C i2c(D_SDA, D_SCL);
+
+// Bus Interface Hardware definitions
+PCF8574_DataBus    databus = PCF8574_DataBus(i2c, D_I2C_DATA_BUS);  //Copy constructors..
+PCF8574_AddressBus addressbus = PCF8574_AddressBus(i2c, D_I2C_ADDR_BUS);
+PCF8574_EnableBus  enablebus = PCF8574_EnableBus(i2c, D_I2C_ENA_BUS);
+MBED_ControlBus  controlbus = MBED_ControlBus(D_WR, D_RD, D_DTR, D_CDBUF, D_CDINT);
+
+// Display Hardware definitions
+HDSP253X_Display LED_display = HDSP253X_Display(databus, addressbus, enablebus, controlbus);
+
+// Dummy delay
+#define DEVICE_WAIT_MS   0
+
+
+// Variables for Heartbeat and Status monitoring
+Ticker heartbeat;
+bool heartbeatflag=false;
+
+// Cycle Timer
+Timer cycletimer;
+int cyclecount = 0;
+const int maxcount = 10;
+
+// Local functions
+void clear_screen() {
+//ANSI Terminal Commands
+    pc.printf("\x1B[2J");
+    pc.printf("\x1B[H");
+}
+
+
+void init_interfaces() {
+// Init Host PC communication, default is 9600
+    pc.baud(D_BAUDRATE);
+      
+// Init I/F hardware
+    i2c.frequency(100000);  
+  
+    //Done, Tell me about it
+    myled1 = 1;
+//    DBG("Init Interfaces Done\r");    
+}
+      
+
+// Heartbeat monitor
+void pulse() {
+  heartbeatLED = !heartbeatLED;
+}
+
+void heartbeat_start() {
+  heartbeat.attach(&pulse, 0.5);
+  heartbeatflag = true;
+}
+
+void heartbeat_stop() {
+  heartbeat.detach();
+  heartbeatflag = false;
+}
+
+void show_LEDS () {
+  static int state = 0;
+ 
+  switch (state) {
+   case 0: 
+        myled1 = 1;
+        myled2 = 0;
+        myled3 = 0;
+        state = 1;
+        break;
+   case 1: 
+        myled1 = 0;
+        myled2 = 1;
+        myled3 = 0;
+        state = 2;
+        break;
+   case 2:     
+        myled1 = 0;
+        myled2 = 0;
+        myled3 = 1;
+        state = 0;
+        break;
+   }
+}
+
+
+// The next two functions are examples of low-level reading and writing to a device that is connected on the mbed bus.
+// In your own application you can develop a Class for each specific slave device and include modified versions of the 
+// functions below as 'private' functions. This allows you to hardcode the device CS_pin signals, define specific delays
+// when needed, change the sequence of CS, WR etc or mask out certain address or databits when they are not used in a certain case.
+//
+
+/*---------------------------------------------------------------------------*\
+ |
+ |  Function:       write
+ |
+ |  Description:    Low level data write routine for device. Takes in data
+ |                  and address and CS pin to identify the device and writes
+ |                  data to the display. For simplicity, entire address byte
+ |                  is written, even though top two bits are unused inputs.
+ |                  After performing the operation, address lines are set
+ |                  all high, in order to eliminate current drain through
+ |                  pullup resistors (0.5mA per pin with 10K pullups)
+ |
+ |  Parameters:     address - full address in bits 0-5
+ |                  device  - enum CS_Pin for Chip Select pin
+ |                  data - data byte to write out
+ |
+ |  Returns:        Nothing.
+ |
+\*---------------------------------------------------------------------------*/
+
+void write(uint8_t address, CS_Pin device, uint8_t data)
+{
+//    // Switch databus buffer to outputs (note: this is the default state)
+//    controlbus.busdir(WRITE);        
+//    // Switch databus to outputs
+//    databus.busdir(WRITE);   
+
+    
+    // Write out the address on to the addressbus and wait
+    addressbus.write(address);
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Set CE low and wait
+    enablebus.chipselect(device, LOW);  
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Write data to the databus
+    databus.write(data);        
+    wait_ms(DEVICE_WAIT_MS);
+     
+    // Set WR low, wait, then set high and wait
+    controlbus.WR(LOW);
+    wait_ms(DEVICE_WAIT_MS);
+    controlbus.WR(HIGH);
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Set CE high and wait
+    enablebus.chipselect(device, HIGH);  
+    wait_ms(DEVICE_WAIT_MS);
+    
+//    // Switch databus back to inputs
+//    databus.busdir(READ);        
+//    // Switch databus buffer back to inputs
+//    controlbus.busdir(READ);  
+
+//    // Set address lines all high to minimise power through pullups
+//    addressbus.write(0xFF);
+}
+
+/*---------------------------------------------------------------------------*\
+ |
+ |  Function:       read
+ |
+ |  Description:    Low level data read routine for a Device. Takes in 
+ |                  address and CS pin to identify the device and then 
+ |                  reads data from the device.
+ |                  After performing the operation, address lines are set
+ |                  all high, in order to eliminate current drain through
+ |                  pullup resistors (0.5mA per pin with 10K pullups)
+ |
+ |  Parameters:     address - 8 bit address
+ |                  device  - enum CS_Pin for Chip Select pin
+ |  Returns:        data - data byte read
+ |
+\*---------------------------------------------------------------------------*/
+
+uint8_t read(uint8_t address, CS_Pin device)
+{
+    uint8_t data = 0;
+
+    // Switch databus to inputs (default state is output)
+    databus.busdir(READ);        
+    // Switch databus buffer to inputs
+    controlbus.busdir(READ);      
+       
+    // Write out the address on to the addressbus and wait
+    addressbus.write(address);
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Set CE low and wait
+    enablebus.chipselect(device, LOW);
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Set RD low and wait
+    controlbus.RD(LOW);
+    wait_ms(DEVICE_WAIT_MS);
+    
+    // Read the data byte from databus
+    data = databus.read();
+
+    // set RD high and wait
+    controlbus.RD(HIGH);
+    wait_ms(DEVICE_WAIT_MS);
+
+    // Set CE high and wait
+    enablebus.chipselect(device, HIGH);
+    wait_ms(DEVICE_WAIT_MS);
+
+//    // Set address lines all high to minimise power through pullups
+//    addressbus.write(0xFF);
+
+    // Switch databus buffer back to outputs
+    controlbus.busdir(WRITE);        
+    // Switch databus to outputs
+    databus.busdir(WRITE);   
+    
+    // Return read data to caller
+    return data;
+}
+
+
+void HDSP_BITE() {
+  int count;
+    
+    for (count=0; count<5; count++) {
+      LED_display.locate(0);
+      LED_display.printf("BITE  - ");
+      wait(0.05);                    
+      LED_display.locate(0);         
+      LED_display.printf("BITE  \\ ");
+      wait(0.05);                              
+      LED_display.locate(0);        
+      LED_display.printf("BITE  | ");
+      wait(0.05);              
+      LED_display.locate(0);    
+      LED_display.printf("BITE  / ");    
+      wait(0.05);      
+      LED_display.locate(0);    
+      LED_display.printf("BITE  - ");                
+      wait(0.05);      
+    };
+
+    LED_display.locate(0);    
+    LED_display.printf("BITE  OK"); 
+
+    LED_display.set_blink_mode(true);            
+    wait(2.0);          
+    LED_display.set_blink_mode(false);
+                    
+    LED_display.cls();  
+
+    //Done, Tell me about it                        
+//    DBG("BITE Done, Main, Step = %d\r", 30);    
+}
+
+void HDSP_Init_UDC() {
+
+// batt empty
+  LED_display.define_user_char(0, 0x0E, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1F);
+// batt full  
+  LED_display.define_user_char(1, 0x0E, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F);  
+}  
+  
+
+void HDSP_Show_UDC() {
+ 
+  LED_display.locate(0);    
+  LED_display.printf("Batt "); 
+//  LED_display.putc(HDSP253X_ASCII_UDC_CHARS + 0); 
+//  LED_display.putc(HDSP253X_ASCII_UDC_CHARS + 1); 
+  LED_display.putudc(0); 
+  LED_display.putudc(1); 
+    
+  wait(2.0);          
+}
+
+int main() {
+    int address;
+    uint8_t dummy;
+
+    init_interfaces();
+    
+    heartbeat_start();
+          
+    clear_screen(); 
+    
+    HDSP_Init_UDC();
+            
+//    DBG("Start Main Loop\r");    
+
+//Testing stuff
+        
+    //Test cycletime
+    cycletimer.start();      
+    cycletimer.reset();
+
+
+#if (1)
+// Bus test
+    while (1) {
+      for (address=0; address<256; address++) {
+        //data = read(address, CS_SWITCH);
+        
+        dummy = ~address;
+        write(address, LATCHEN_1, dummy); 
+//        wait(0.05);       
+      }    
+    
+      // Just for Info, lets see how fast this cycle is...
+      cyclecount++;
+      if (cyclecount == maxcount) {
+        pc.printf("Freq = %d Hz\r", (cyclecount * 256 * 1000) / cycletimer.read_ms());
+        cyclecount = 0;          
+        cycletimer.reset();      
+      }
+      
+      show_LEDS ();      
+    }
+#else
+// LED Display test
+    while (1) {
+      HDSP_BITE();   
+
+      cyclecount++;
+      if (cyclecount == 10) {
+        cyclecount = 0;
+//        LED_display.printf ("Restart ");
+        HDSP_Show_UDC();         
+      }       
+      else {
+        LED_display.printf ("Cnt=  %2d", cyclecount);      
+      }
+      wait(2.0);
+      pc.printf ("."); 
+                     
+      show_LEDS ();      
+    }
+
+#endif
+      
+    //DBG("I'll be back...\r\r");
+}

diff -r aaefa04f06be -r 8680b8b718c8 mbed.bld.orig
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld.orig	Sun Jan 25 17:52:55 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912
\ No newline at end of file