document

doc/keybrd_library_developer_guide.md

@@ -11,20 +11,70 @@ This guide is for the maintainers and developers of the keybrd library and it's
 It is assumed the reader is familiar with C++ language including pointers, objects, classes, static class variables, composition, aggregation, inheritance, polymorphism, and enum.
 Debouncer and I/O expander use bit manipulation.
 
+## Custom Row classes
+The keybrd library is flexible for designing custom Rows
+ * RowBase functions can be overridden in a derived class
+ * choice of Debouncers
+ * choice of Scanners
+
+this example illustrates the custom Row classes from a fictional keybrd_Ext library
+the keybrd_Ext library library is for a split keyboard with a matrix on each hand
+the diagrams show the design decisions made by the developer
+
+Row_Ext overrides RowBase::keyWasPressed()
+Row_Ext::keyWasPressed() is used to unstick sticky keys
+
+Row_Ext_uC scans the primary matrix
+Row_Ext_uC is a custom class composed of stock keybrd library classes
+
+Row_Ext_ShiftRegisters scans the secondary matrix
+Row_Ext_ShiftRegisters is a custom class composed of stock keybrd library classes
+
+Class inheritance diagram
+```
+
+    	   RowBase
+	         |
+	       Row_Ext                                override RowBase::keyWasPressed()
+          /      \
+    Row_Ext_uC  Row_Ext_ShiftRegisters            inherit Row_Ext::keyWasPressed()
+
+/home/wolfv/Documents/Arduino/keybrd_proj/keybrd/doc/keybrd_library_developer_guide.md
+	            RowScannerInterface
+	              /           \
+	RowScanner_PinsArray  RowScanner_SPIShiftRegisters
+
+```
+
+Dependency diagram
+```
+
+	         ________ Row_Ext_uC[1] _______________
+	        /                     \                \
+	RowScanner_PinsArray[1]  Debouncer_Samples[1]  Key[1..*]
+	  /             \                               |
+	strobePin[1]  readPins[1..*]                   Code[1..*]
+
+
+              _____ Row_Ext_ShiftRegisters[1] _____________
+	         /                        \                    \
+    RowScanner_SPIShiftRegisters[1]  Debouncer_Samples[1]  Key[1..*]
+	       /       \                                        |
+    strobePin[1]  ROW_END[1]                               Code[1..*]
+
+```
+
 ## Class inheritance diagrams
 
 Keybrd library class inheritance diagram
 ```
-	Matrix
-
-	    RowBase
-	    /    \
-	Row_uC  Row_IOE
+	             RowBase
+	    /          |             \
+	Row_uC  Row_ShiftRegisters  Row_IOE
 
 	            RowScannerInterface
-	              /           \
-	RowScanner_PinsArray  RowScanner_PinsBitwise
-
+	              /          \                     \
+	RowScanner_PinsArray  RowScanner_PinsBitwise  RowScanner_SPIShiftRegisters
 
 	IOExpanderPort
 
@@ -122,6 +172,12 @@ Example multi-layer dependency diagram with layer LEDs
 
 ```
 
+Example multi-layer dependency diagram with shift registers
+```
+    Row_ShiftRegisters
+
+```
+
 Example multi-layer dependency diagram with I/O Expander
 ```
 	                                                    

examples/keybrd_shift_register/keybrd_shift_register.ino

@@ -1,9 +1,9 @@
 /* keybrd_shift_reg.ino
-tested on Teensy LC and daisy chained 74HC165 shift registers
+Tested on Teensy LC and daisy chained 74HC165 shift registers
 
-the keyboard hardware for this sketch has 4 shift registers,
- with every 4th input pins connected to a pull-down resistor and matrix column.
-unused input pins are not grounded, so add this line to RowScanner_SPIShiftRegisters::scan():
+The keyboard hardware for this sketch has 4 shift registers,
+ with every 4th input pin connected to a pull-down resistor and matrix column, also the 31st key.
+Unused input pins are not grounded, so add this line to RowScanner_SPIShiftRegisters::scan():
     //clear unpowered pins (for testing on breadboard)
     rowState &= 0b01010001000100010001000100010001;
 

src/RowBase.cpp

@@ -5,9 +5,9 @@ process() scans the row and calls any newly pressed or released keys.
 void RowBase::process()
 {
     //these variables are all bitwise, one bit per key
-    read_pins_t rowState;                           //1 means pressed, 0 means released
-    read_pins_mask_t rowEnd;                            //1 bit marks positioned after last key of row
-    read_pins_t debouncedChanged;                   //1 means debounced changed
+    read_pins_t rowState;                       //1 means pressed, 0 means released
+    read_pins_mask_t rowEnd;                    //1 bit marks positioned after last key of row
+    read_pins_t debouncedChanged;               //1 means debounced changed
 
     wait();
     rowState = scan(rowEnd);
@@ -19,7 +19,7 @@ void RowBase::process()
 This version of wait() is very simple.  More sophisticated versions can override this one.
 
 For fastest response time, wait() should be placed before scan() or after pressRelease()
- (waiting between strobe and send would unnecessarily delay send).
+ (waiting between scan and send would unnecessarily delay send).
 
 DELAY_MICROSECONDS explained
 ----------------------------

src/RowBase.h

@@ -11,7 +11,7 @@ class RowBase
 {
     private:
         static const unsigned int DELAY_MICROSECONDS; //delay between each Row scan for debouncing
-        Key *const *const ptrsKeys;         //array of Key pointers
+        Key *const *const ptrsKeys;             //array of Key pointers
 
         virtual void keyWasPressed();
     protected:

src/RowScanner_SPIShiftRegisters.cpp

@@ -36,8 +36,8 @@ read_pins_t RowScanner_SPIShiftRegisters::scan(read_pins_mask_t& rowEnd)
 
     rowEnd = ROW_END;
 
-    //clear unpowered pins (for testing bb) todo
-    rowState &= 0b01010001000100010001000100010001; //also 31st key
+    //for testing breadboard, clear unpowered pins
+    rowState &= 0b01010001000100010001000100010001; //todo
 
     return rowState;
 }

src/Row_uC.h

@@ -20,7 +20,7 @@ Example instantiation of a row:
     const uint8_t COL_PIN_COUNT = sizeof(colPins)/sizeof(*colPins);
 
     Key* const ptrsKeys_0[] = { &k_00, &k_01, &k_02, &k_03, &k_04, &k_05 };
-    Row_DH_uC row_0(21, colPins, COL_PIN_COUNT, ptrsKeys_0);
+    Row_uC row_0(21, colPins, COL_PIN_COUNT, ptrsKeys_0);
 
 Number of colPins should equal number of keys in ptrsKeys_0[] array.
     if a colPin is missing, a key will be unresposive