Diff: PCF8574_EnableBus.cpp

Revision:

7:8680b8b718c8

Parent:

6:aaefa04f06be

--- 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