Diff: Latch_FET_Driver.cpp

Revision:

5:7d1b124490ed

Parent:

4:6b3722251fd7

Child:

6:073ee2fd1245

Child:

7:909d7e3822d8

diff -r 6b3722251fd7 -r 7d1b124490ed Latch_FET_Driver.cpp
--- a/Latch_FET_Driver.cpp	Sun Feb 07 18:22:35 2016 +0000
+++ b/Latch_FET_Driver.cpp	Sat Feb 20 13:22:50 2016 +0000
@@ -1,42 +1,86 @@
 #include "mbed.h"
 #include "Latch_FET_Driver.h"
 
-Latch_FET_Driver::Latch_FET_Driver(PinName set,PinName reset)
+
+/*  =============================================================
+    Latch_FET_Driver constructor 
+    
+    Inputs
+    ------
+    PinName D:      Pin to create D input to D Latch
+    PinName CLK:    Pin to create CLK input to D Latch 
+    
+    Description
+    -----------
+    
+    Once the new DigitalOut types are assigned, the D Latch at
+    the given Pins is initialised to an outputLow state, ensuring
+    that uopn setup, a known state is entered quickly.
+    
+    =============================================================  */ 
+Latch_FET_Driver::Latch_FET_Driver(PinName D,PinName CLK)
 {
-    SetPin = new DigitalOut(set);
-    ResetPin = new DigitalOut(reset);
-    // Ensure that SR latch does not enter unknown state
-    Latch_FET_Driver::initialState();
-}
-
-void Latch_FET_Driver::initialState()
-{
-    SetPin -> write(LOW);
-    ResetPin ->write(HIGH); 
-}
-
-void Latch_FET_Driver::outputHigh()
-{
-       ResetPin -> write(LOW);
-       SetPin -> write(HIGH); 
+    // Assign passed in Pin Names as new DigitalOut data types
+    _D = new DigitalOut(D);
+    _CLK = new DigitalOut(CLK);
+    
+    // Ensure that D latch does not enter unknown state
+    // Initialise is the same as the outputLow method
+    Latch_FET_Driver::outputLow();
 }
 
-void Latch_FET_Driver::outputLow()
+/*  ================================================================
+    outputHigh is a public method to set a HIGH output on the given
+    D Latch.
+    
+    The procedure to set Q into a HIGH condition is as follows;
+        
+    1. Ensure CLK is low
+    2. Set D high
+    3. wait STATE_DELAY us
+    4. Set CLK high
+    5. wait 10*STATE_DELAY us
+    6. Set CLK low
+    7. wait STATE_DELAY us
+    8. set D low
+    9. return void
+    ================================================================  */ 
+void Latch_FET_Driver::outputHigh()
 {
-       SetPin -> write(LOW); 
-       ResetPin -> write(HIGH);
-
+    _CLK -> write(LOW);
+    _D -> write(HIGH);
+    wait_us(STATE_DELAY);
+    _CLK -> write(HIGH); 
+    wait_us(10*STATE_DELAY);
+    _CLK -> write(LOW);
+    wait_us(STATE_DELAY);
+    _D -> write(LOW);
 }
 
-//int Latch_FET_Driver::setOutput()
-//{
-//    ResetPin = LOW;
-//    
-//    return 0;
-//}
-// 
-//int Latch_FET_Driver::resetOutput()
-//{
-//    
-//}
+/*  ================================================================
+    outputLow is a public method to set a HIGH output on the given
+    D Latch.
+    
+    The procedure to set Q into a LOW condition is as follows;
+        
+    1. Ensure CLK is low
+    2. Set D low
+    3. wait STATE_DELAY us
+    4. Set CLK high
+    5. wait 10*STATE_DELAY us
+    6. Set CLK low
+    7. wait STATE_DELAY us
+    8. return void
+    ================================================================  */ 
+void Latch_FET_Driver::outputLow()
+{
+    _CLK -> write(LOW);
+    _D -> write(LOW);
+    wait_us(STATE_DELAY);
+    _CLK -> write(HIGH); 
+    wait_us(10*STATE_DELAY);
+    _CLK -> write(LOW);
+    wait_us(STATE_DELAY);
+}
 
+