Revision 0:27f32a087e5a, committed 2015-11-21

Comitter:

wim

Date:

Sat Nov 21 16:43:15 2015 +0000

Child:

1:1adf993a3e34

Commit message:

First version

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Font_7Seg.cpp	Sat Nov 21 16:43:15 2015 +0000
@@ -0,0 +1,49 @@
+/* mbed LED Font Library, for Princeton PT6964 controller as used in DVD538A
+ * Copyright (c) 2015, v01: WH, Initial version
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "Font_7Seg.h"
+
+// ASCII Font definition table for transmission to PT6964
+//
+//#define FONT_7S_START     0x20
+//#define FONT_7S_END       0x7F
+//#define FONT_7S_NR_CHARS (FONT_7_END - FONT_7S_START + 1)
+ 
+const char FONT_7S[][2] = { 
+                             {LO(C_0), HI(C_0)}, //48 0x30
+                             {LO(C_1), HI(C_1)},
+                             {LO(C_2), HI(C_2)},
+                             {LO(C_3), HI(C_3)},
+                             {LO(C_4), HI(C_4)},                   
+                             {LO(C_5), HI(C_5)},
+                             {LO(C_6), HI(C_6)},
+                             {LO(C_7), HI(C_7)},
+                             {LO(C_8), HI(C_8)},
+                             {LO(C_9), HI(C_9)},
+                             {LO(C_A), HI(C_A)}, //65 0x41, A
+                             {LO(C_B), HI(C_B)},
+                             {LO(C_C), HI(C_C)},
+                             {LO(C_D), HI(C_D)},
+                             {LO(C_E), HI(C_E)},
+                             {LO(C_F), HI(C_F)}
+                                                 };// 127                             
+  
+ 
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Font_7Seg.h	Sat Nov 21 16:43:15 2015 +0000
@@ -0,0 +1,93 @@
+/* mbed LED Font Library, for Princeton PT6964 controller as used in DVD538A
+ * Copyright (c) 2015, v01: WH, Initial version
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MBED_FONT_7SEG_H
+#define MBED_FONT_7SEG_H
+
+// Segment bit positions for 7 Segment display using the DVD538A mapping for PT6964
+// Modify this table for different 'bit-to-segment' mappings. The ASCII character defines and the FONT_7S const table below 
+// will be adapted automatically according to the bit-to-segment mapping. Obviously this will only work when the segment
+// mapping is identical for every digit position. This will be the case unless the hardware designer really hates software developers.
+//
+#define S_D    0x0008 
+#define S_C    0x0010
+#define S_B    0x0020
+#define S_A    0x0040 
+#define S_E    0x0080
+#define S_F    0x0100
+#define S_G    0x0200
+
+#define S_LD2  0x0001
+#define S_LD1  0x0002
+#define S_CD   0x0008
+#define S_DVD  0x0010
+#define S_PSE  0x0020
+#define S_PLY  0x0040
+#define S_COL  0x0080
+#define S_MP4  0x0100
+#define S_MP3  0x0200
+
+//Mask for blending out and restoring Icons
+//One mask pattern will be sufficient assuming that all digits use the same mapping.
+#define S_ICON_MSK (0x0000)
+
+
+// ASCII Font definitions for segments in each character
+//
+//48 0x30 digits
+#define C_0    (S_A | S_B | S_C | S_D | S_E | S_F)
+#define C_1    (S_B | S_C)
+#define C_2    (S_A | S_B | S_D | S_E | S_G)
+#define C_3    (S_A | S_B | S_C | S_D | S_G)
+#define C_4    (S_B | S_C | S_F | S_G)
+#define C_5    (S_A | S_C | S_D | S_F | S_G)
+#define C_6    (S_A | S_C | S_D | S_E | S_F | S_G)
+#define C_7    (S_A | S_B | S_C)
+#define C_8    (S_A | S_B | S_C | S_D | S_E | S_F | S_G)
+#define C_9    (S_A | S_B | S_C | S_D | S_F | S_G)
+//64 0x40
+#define C_A    (S_A | S_B | S_C | S_E | S_F | S_G )  // Upper case alphabet
+#define C_B    (S_C | S_D | S_E | S_F | S_G)
+#define C_C    (S_A | S_D | S_E | S_F)
+#define C_D    (S_B | S_C | S_D | S_E | S_G)
+#define C_E    (S_A | S_D | S_E | S_F | S_G)
+#define C_F    (S_A | S_E | S_F | S_G)
+//97 0x61
+#define C_a    (S_A | S_B | S_C | S_E | S_F | S_G )  // Lower case alphabet
+#define C_b    (S_C | S_D | S_E | S_F | S_G)
+#define C_c    (S_A | S_D | S_E | S_F)
+#define C_d    (S_B | S_C | S_D | S_E | S_G)
+#define C_e    (S_A | S_D | S_E | S_F | S_G)
+#define C_f    (S_A | S_E | S_F | S_G)
+
+// Font data selection for transmission to PT6964 memory
+#define LO(x)  ( x & 0xFF)
+#define HI(x)  ((x >> 8) & 0xFF)
+
+
+// ASCII Font definition table
+//
+//#define FONT_7S_START     0x20
+//#define FONT_7S_END       0x7F
+//#define FONT_7S_NR_CHARS (FONT_7S_END - FONT_7S_START + 1)
+extern const char FONT_7S[][2]; 
+
+#endif 
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PT6964.cpp	Sat Nov 21 16:43:15 2015 +0000
@@ -0,0 +1,439 @@
+/* mbed PT6964 Library, for PT6964 LED controller
+ * Copyright (c) 2015, v01: WH, Initial version
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "mbed.h" 
+#include "PT6964.h"
+#include "Font_7Seg.h"
+
+/** Constructor for class for driving PT6964 LED controller with SPI bus interface device. 
+ *  Note: the PT6964 is also available from other chipvendors eg AIP1628, HT1628, CM1628, SM1628
+ *  @brief Supports 4 digits @ 13 segments or 5 digits @ 12 segments or 6 Digits @ 11 Segments or 7 Digits @ 10 Segments. 
+ *         Also supports a scanned keyboard of upto 20 keys.
+ *   
+ *  @param  PinName mosi, miso, sclk, cs SPI bus pins
+ *  @param  Mode selects either 6 Digits of 12 Segments or 7 Digits of 10 Segments (default) 
+*/
+PT6964::PT6964(PinName mosi, PinName miso, PinName sclk, PinName cs, Mode mode) : _spi(mosi,miso,sclk), _cs(cs), _mode(mode) {
+
+  _init();
+}
+
+/** Init the SPI interface and the controller
+  * @param  none
+  * @return none
+  */ 
+void PT6964::_init(){
+  
+//init SPI
+  _cs=1;
+  _spi.format(8,3); //PT6964 uses mode 3 (Clock High on Idle, Data latched on second (=rising) edge)
+  _spi.frequency(500000);   
+
+//init controller  
+  _writeCmd(PT6964_MODE_SET_CMD, _mode);                                               // Mode set command 
+
+  _display = PT6964_DSP_ON;
+  _bright  = PT6964_BRT_DEF; 
+  _writeCmd(PT6964_DSP_CTRL_CMD, _display | _bright );                                 // Display control cmd, display on/off, brightness   
+  
+  _writeCmd(PT6964_DATA_SET_CMD, PT6964_DATA_WR | PT6964_ADDR_INC | PT6964_MODE_NORM); // Data set cmd, normal mode, auto incr, write data  
+}   
+
+
+/** Clear the screen and locate to 0
+ */  
+void PT6964::cls() {
+  
+  _cs=0;
+  wait_us(1);    
+  _spi.write(_flip(PT6964_ADDR_SET_CMD | 0x00)); // Address set cmd, 0
+      
+  for (int cnt=0; cnt<PT6964_DISPLAY_MEM; cnt++) {
+    _spi.write(0x00); // data 
+  }
+  
+  wait_us(1);
+  _cs=1;      
+}  
+
+/** Set Brightness
+  *
+  * @param  char brightness (3 significant bits, valid range 0..7 (1/16 .. 14/14 dutycycle)  
+  * @return none
+  */
+void PT6964::setBrightness(char brightness){
+
+  _bright = brightness & PT6964_BRT_MSK; // mask invalid bits
+  
+  _writeCmd(PT6964_DSP_CTRL_CMD, _display | _bright );  // Display control cmd, display on/off, brightness  
+}
+
+/** Set the Display mode On/off
+  *
+  * @param bool display mode
+  */
+void PT6964::setDisplay(bool on) {
+  
+  if (on) {
+    _display = PT6964_DSP_ON;
+  }
+  else {
+   _display = PT6964_DSP_OFF;
+  }
+  
+  _writeCmd(PT6964_DSP_CTRL_CMD, _display | _bright );  // Display control cmd, display on/off, brightness   
+}
+
+/** Write databyte to PT6964
+  *  @param  int address display memory location to write byte
+  *  @param  char data byte written at given address
+  *  @return none
+  */ 
+void PT6964::writeData(int address, char data) {
+  _cs=0;
+  wait_us(1);    
+  _spi.write(_flip(PT6964_ADDR_SET_CMD | (address & PT6964_ADDR_MSK))); // Set Address cmd
+      
+  _spi.write(_flip(data)); // data 
+  
+  wait_us(1);
+  _cs=1;             
+}
+
+/** Write Display datablock to PT6964
+  *  @param  DisplayData_t data Array of PT6964_DISPLAY_MEM (=14) bytes for displaydata (starting at address 0)
+  *  @param  length number bytes to write (valide range 0..PT6964_DISPLAY_MEM (=14), starting at address 0)     
+  *  @return none
+  */ 
+void PT6964::writeData(DisplayData_t data, int length) {
+  _cs=0;
+  wait_us(1);    
+  _spi.write(_flip(PT6964_ADDR_SET_CMD | 0x00)); // Set Address at 0
+      
+// sanity check
+  if (length < 0) {length = 0;}
+  if (length > PT6964_DISPLAY_MEM) {length = PT6964_DISPLAY_MEM;}
+
+//  for (int idx=0; idx<PT6964_DISPLAY_MEM; idx++) {  
+  for (int idx=0; idx<length; idx++) {    
+    _spi.write(_flip(data[idx])); // data 
+  }
+  
+  wait_us(1);
+  _cs=1;             
+}
+
+
+/** Read keydata block from PT6964
+  *  @param  *keydata Ptr to Array of PT6964_KEY_MEM (=5) bytes for keydata
+  *  @return bool keypress True when at least one key was pressed
+  *
+  * Note: Due to the hardware configuration the PT6964 key matrix scanner will detect multiple keys pressed at same time,
+  *       but this may also result in some spurious keys being set in keypress data array.
+  *       It may be best to ignore all keys in those situations. That option is implemented in this method depending on #define setting.  
+  */ 
+bool PT6964::getKeys(KeyData_t *keydata) {
+  int keypress = 0;
+  char data;
+
+  // Read keys
+  _cs=0;
+  wait_us(1);    
+  
+  // Enable Key Read mode
+  _spi.write(_flip(PT6964_DATA_SET_CMD | PT6964_KEY_RD | PT6964_ADDR_INC | PT6964_MODE_NORM)); // Data set cmd, normal mode, auto incr, read data
+
+  for (int idx=0; idx < PT6964_KEY_MEM; idx++) {
+    data = _flip(_spi.write(0xFF));    // read keys and correct bitorder
+
+    if (data != 0) {  // Check for any pressed key
+      for (int bit=0; bit < PT6964_KEY_BITS; bit++) {
+        if (data & (1 << bit)) {keypress++;} // Test all significant bits
+      }
+    }  
+
+    (*keydata)[idx] = data;            // Store keydata after correcting bitorder
+  }
+
+  wait_us(1);
+  _cs=1;    
+
+  // Restore Data Write mode
+  _writeCmd(PT6964_DATA_SET_CMD, PT6964_DATA_WR | PT6964_ADDR_INC | PT6964_MODE_NORM); // Data set cmd, normal mode, auto incr, write data  
+      
+#if(1)
+// Dismiss multiple keypresses at same time
+  return (keypress == 1);    
+#else
+// Allow multiple keypress and accept possible spurious keys
+  return (keypress > 0);
+#endif  
+}
+    
+
+/** Helper to reverse all command or databits. The PT6964 expects LSB first, whereas SPI is MSB first
+  *  @param  char data
+  *  @return bitreversed data
+  */ 
+char PT6964::_flip(char data) {
+ char value=0;
+  
+ if (data & 0x01) {value |= 0x80;} ;  
+ if (data & 0x02) {value |= 0x40;} ;
+ if (data & 0x04) {value |= 0x20;} ;
+ if (data & 0x08) {value |= 0x10;} ;
+ if (data & 0x10) {value |= 0x08;} ;
+ if (data & 0x20) {value |= 0x04;} ;
+ if (data & 0x40) {value |= 0x02;} ;
+ if (data & 0x80) {value |= 0x01;} ;
+ return value;       
+}
+
+
+/** Write command and parameter to PT6964
+  *  @param  int cmd Command byte
+  *  &Param  int data Parameters for command
+  *  @return none
+  */  
+void PT6964::_writeCmd(int cmd, int data){
+    
+  _cs=0;
+  wait_us(1);    
+//  _spi.write(_flip( (cmd & 0xF0) | (data & 0x0F)));  
+  _spi.write(_flip( (cmd & PT6964_CMD_MSK) | (data & ~PT6964_CMD_MSK)));   
+ 
+  wait_us(1);
+  _cs=1;          
+}  
+
+
+
+
+/** Constructor for class for driving Princeton PT6964 controller as used in DVD538A
+  *
+  *  @brief Supports 4 Digits of 7 Segments, 1 Grid of 9 Icons. Also supports a scanned keyboard of 4.
+  *   
+  *  @param  PinName mosi, miso, sclk, cs SPI bus pins
+  */
+PT6964_DVD538A::PT6964_DVD538A(PinName mosi, PinName miso, PinName sclk, PinName cs) : PT6964(mosi, miso, sclk, cs, Grid7_Seg10) {
+  _column  = 0;
+  _columns = DVD538A_NR_DIGITS;    
+}  
+
+#if(0)
+#if DOXYGEN_ONLY
+    /** Write a character to the Display
+     *
+     * @param c The character to write to the display
+     */
+    int putc(int c);
+
+    /** Write a formatted string to the Display
+     *
+     * @param format A printf-style format string, followed by the
+     *               variables to use in formatting the string.
+     */
+    int printf(const char* format, ...);   
+#endif
+#endif
+
+/** Locate cursor to a screen column
+  *
+  * @param column  The horizontal position from the left, indexed from 0
+  */
+void PT6964_DVD538A::locate(int column) {
+  //sanity check
+  if (column < 0) {column = 0;}
+  if (column > (_columns - 1)) {column = _columns - 1;}  
+  
+  _column = column;       
+}
+
+
+/** Number of screen columns
+  *
+  * @param none
+  * @return columns
+  */
+int PT6964_DVD538A::columns() {
+    return _columns;
+}
+
+    
+/** Clear the screen and locate to 0
+  */
+void PT6964_DVD538A::cls() {
+  
+#if(0)
+  //clear local buffer (including Icons)
+  for (int idx = 0; idx < DVD538A_NR_GRIDS; idx++) {
+    _displaybuffer[(idx<<1)]     = 0x00;  
+    _displaybuffer[(idx<<1) + 1] = 0x00;      
+  }
+#else
+  //clear local buffer (preserving Icons)
+  for (int idx = DVD538A_DIG1_IDX; idx < (DVD538A_DIG1_IDX + DVD538A_NR_DIGITS); idx++) {    
+    _displaybuffer[(idx<<1)]     = _displaybuffer[(idx<<1)]     & LO(S_ICON_MSK);  
+    _displaybuffer[(idx<<1) + 1] = _displaybuffer[(idx<<1) + 1] & HI(S_ICON_MSK);      
+  }
+#endif  
+
+  writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+
+  _column = 0;   
+}    
+
+/** Set Icon
+  *
+  * @param Icon icon Enums Icon has Grid position encoded in 16 MSBs, Icon pattern encoded in 16 LSBs
+  * @return none
+  */
+void PT6964_DVD538A::setIcon(Icon icon) {
+  int addr, icn;
+
+   icn =         icon  & 0xFFFF;
+  addr = ((icon >> 16) & 0xFFFF) - 1; 
+    
+  //Save char...and set bits for icon to write
+  _displaybuffer[addr]   = _displaybuffer[addr]   | LO(icn);      
+  _displaybuffer[addr+1] = _displaybuffer[addr+1] | HI(icn);      
+  writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+}
+
+/** Clr Icon
+  *
+  * @param Icon icon Enums Icon has Grid position encoded in 16 MSBs, Icon pattern encoded in 16 LSBs
+  * @return none
+  */
+void PT6964_DVD538A::clrIcon(Icon icon) {
+  int addr, icn;
+
+   icn =         icon  & 0xFFFF;
+  addr = ((icon >> 16) & 0xFFFF) - 1; 
+    
+  //Save char...and clr bits for icon to write
+  _displaybuffer[addr]   = _displaybuffer[addr]   & ~LO(icn);      
+  _displaybuffer[addr+1] = _displaybuffer[addr+1] & ~HI(icn);      
+  writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+}
+
+
+/** Set User Defined Characters (UDC)
+  *
+  * @param unsigned char udc_idx  The Index of the UDC (0..7)
+  * @param int udc_data           The bitpattern for the UDC (16 bits)       
+  */
+void PT6964_DVD538A::setUDC(unsigned char udc_idx, int udc_data) {
+
+  //Sanity check
+  if (udc_idx > (DVD538A_NR_UDC-1)) {
+    return;
+  }
+  // Mask out Icon bits?
+
+  _UDC_16S[udc_idx][0] = LO(udc_data);
+  _UDC_16S[udc_idx][1] = HI(udc_data);
+}
+
+/** Write a single character (Stream implementation)
+  */
+int PT6964_DVD538A::_putc(int value) {
+  int addr;
+    
+    if ((value == '\n') || (value == '\r')) {
+      //No character to write
+      
+      //Update Cursor      
+      _column = 0;
+    }
+    else if ((value >= 0) && (value < DVD538A_NR_UDC)) {
+      //Character to write
+      addr = (DVD538A_DIG1_IDX + ((DVD538A_NR_DIGITS - 1) - _column)) << 1; 
+      
+      //Save icons...and set bits for character to write
+      _displaybuffer[addr]   = (_displaybuffer[addr]   & LO(S_ICON_MSK)) | _UDC_16S[value][0];      
+      _displaybuffer[addr+1] = (_displaybuffer[addr+1] & HI(S_ICON_MSK)) | _UDC_16S[value][1];      
+      writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+               
+      //Update Cursor
+      _column++;
+      if (_column > (DVD538A_NR_DIGITS - 1)) {
+        _column = 0;
+      }          
+    }  
+    else if ((value >= (int)'0') && (value <= (int) '9')) {   
+      //Character to write
+      value = value - (int) '0';
+      addr = (DVD538A_DIG1_IDX + ((DVD538A_NR_DIGITS - 1) - _column)) << 1; 
+      
+      //Save icons...and set bits for character to write
+      _displaybuffer[addr]   = (_displaybuffer[addr]   & LO(S_ICON_MSK)) | FONT_7S[value][0];      
+      _displaybuffer[addr+1] = (_displaybuffer[addr+1] & HI(S_ICON_MSK)) | FONT_7S[value][1];      
+      writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+               
+      //Update Cursor
+      _column++;
+      if (_column > (DVD538A_NR_DIGITS - 1)) {
+        _column = 0;
+      }
+    }            
+    else if ((value >= (int) 'A') && (value <= (int) 'F')) {   
+      //Character to write
+      value = 10 + value - (int) 'A';
+      addr = (DVD538A_DIG1_IDX + ((DVD538A_NR_DIGITS - 1) - _column)) << 1; 
+      
+      //Save icons...and set bits for character to write
+      _displaybuffer[addr]   = (_displaybuffer[addr]   & LO(S_ICON_MSK)) | FONT_7S[value][0];      
+      _displaybuffer[addr+1] = (_displaybuffer[addr+1] & HI(S_ICON_MSK)) | FONT_7S[value][1];      
+      writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+               
+      //Update Cursor
+      _column++;
+      if (_column > (DVD538A_NR_DIGITS - 1)) {
+        _column = 0;
+      }
+    }  
+    else if ((value >= (int) 'a') && (value <= (int) 'f')) {   
+      //Character to write
+      value = 10 + value - (int) 'a';
+      addr = (DVD538A_DIG1_IDX + ((DVD538A_NR_DIGITS - 1) - _column)) << 1; 
+      
+      //Save icons...and set bits for character to write
+      _displaybuffer[addr]   = (_displaybuffer[addr]   & LO(S_ICON_MSK)) | FONT_7S[value][0];      
+      _displaybuffer[addr+1] = (_displaybuffer[addr+1] & HI(S_ICON_MSK)) | FONT_7S[value][1];      
+      writeData(_displaybuffer, (DVD538A_NR_GRIDS*2));
+               
+      //Update Cursor
+      _column++;
+      if (_column > (DVD538A_NR_DIGITS - 1)) {
+        _column = 0;
+      }          
+
+    } //else
+
+    return value;
+}
+
+
+// get a single character (Stream implementation)
+int PT6964_DVD538A::_getc() {
+    return -1;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PT6964.h	Sat Nov 21 16:43:15 2015 +0000
@@ -0,0 +1,338 @@
+/* mbed PT6964 Library, for PT6964 LED controller
+ * Copyright (c) 2015, v01: WH, Initial version
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef PT6964_H
+#define PT6964_H
+
+#include "Font_7Seg.h"
+
+/** An interface for driving PT6964 LED controller
+ *
+ * @code
+ * #include "mbed.h"
+ * #include "PT6964.h" 
+ * 
+ * DisplayData_t size is  8 bytes (4 grids @ 13 segments) OR 10 bytes (5 grids @ 12 segments) OR
+ *                       12 bytes (6 grids @ 11 segments) OR 14 bytes (7 grids @ 10 segments) 
+ * PT6964::DisplayData_t mbed_str = {0xDA,0x00, 0x7C,0x00, 0x3C,0x01, 0xF6,0x00, 0x00,0x00, 0x00,0x00, 0x00,0x00};  
+ * PT6964::DisplayData_t all_str  = {0xFF,0x0F, 0xFF,0x0F, 0xFF,0x0F, 0xFF,0x0F, 0xFF,0x0F, 0xFF,0x0F, 0xFF,0x0F};  
+ *
+ * // KeyData_t size is 5 bytes  
+ * PT6964::KeyData_t keydata; 
+ *
+ * // PT6964 declaration, Default setting 7 Grids @ 10 Segments
+ * PT6964 PT6964(p5,p6,p7, p8);
+ *
+ * int main() {
+ *   PT6964.cls(); 
+ *   PT6964.writeData(all_str);
+ *   wait(4);
+ *   PT6964.writeData(mbed_str);    
+ *   wait(1);
+ *   PT6964.setBrightness(PT6964_BRT0);
+ *   wait(1);
+ *   PT6964.setBrightness(PT6964_BRT3);
+ *
+ *   while (1) {
+ *    // Check and read keydata
+ *    if (PT6964.getKeys(&keydata)) {
+ *      pc.printf("Keydata 0..4 = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\r\n", keydata[0], keydata[1], keydata[2], keydata[3], keydata[4]);
+ *
+ *      if (keydata[0] == 0x10) { //sw2   
+ *        PT6964.cls(); 
+ *        PT6964.writeData(all_str);
+ *      }  
+ *    } 
+ *   }   
+ * }
+ * @endcode
+ */
+
+//Memory size in bytes for Display and Keymatrix
+#define PT6964_DISPLAY_MEM    14
+#define PT6964_KEY_MEM         5
+//Significant bits Keymatrix data
+#define PT6964_KEY_BITS        5 
+
+//Reserved bits for commands
+#define PT6964_CMD_MSK      0xC0
+
+//Mode setting command
+#define PT6964_MODE_SET_CMD 0x00
+#define PT6964_GR4_SEG13    0x00
+#define PT6964_GR5_SEG12    0x01
+#define PT6964_GR6_SEG11    0x02
+#define PT6964_GR7_SEG10    0x03 //default
+
+//Data setting commands
+#define PT6964_DATA_SET_CMD 0x40
+#define PT6964_DATA_WR      0x00
+#define PT6964_KEY_RD       0x02
+#define PT6964_ADDR_INC     0x00
+#define PT6964_ADDR_FIXED   0x04
+#define PT6964_MODE_NORM    0x00
+#define PT6964_MODE_TEST    0x08
+
+//Address setting commands
+#define PT6964_ADDR_SET_CMD 0xC0
+#define PT6964_ADDR_MSK     0x0F
+
+//Display control commands
+#define PT6964_DSP_CTRL_CMD 0x80
+#define PT6964_BRT_MSK      0x07
+#define PT6964_BRT0         0x00 //Pulsewidth 1/16
+#define PT6964_BRT1         0x01
+#define PT6964_BRT2         0x02
+#define PT6964_BRT3         0x03
+#define PT6964_BRT4         0x04
+#define PT6964_BRT5         0x05
+#define PT6964_BRT6         0x06
+#define PT6964_BRT7         0x07 //Pulsewidth 14/16
+
+#define PT6964_BRT_DEF      PT6964_BRT3
+
+#define PT6964_DSP_OFF      0x00
+#define PT6964_DSP_ON       0x08
+
+
+/** A class for driving Princeton PT6964 LED controller
+ *  Note: the PT6964 is also available from other chipvendors eg AIP1628, HT1628, CM1628, SM1628
+ *
+ * @brief Supports 4 Grids @ 13 Segments or 5 Grids @ 12 Segments or 6 Grids @ 11 Segments or 7 Grids @ 10 Segments. 
+ *        Also supports a scanned keyboard of upto 20 keys.
+ *        SPI bus interface device. 
+ */
+class PT6964 {
+ public:
+
+  /** Enums for display mode */
+  enum Mode {
+    Grid4_Seg13 = PT6964_GR4_SEG13,
+    Grid5_Seg12 = PT6964_GR5_SEG12,   
+    Grid6_Seg11 = PT6964_GR6_SEG11,
+    Grid7_Seg10 = PT6964_GR7_SEG10
+  };
+  
+  /** Datatypes for display and keymatrix data */
+  typedef char DisplayData_t[PT6964_DISPLAY_MEM];
+  typedef char KeyData_t[PT6964_KEY_MEM];
+    
+ /** Constructor for class for driving Princeton PT6964 LED controller
+  *
+  * @brief Supports 4 Grids @ 13 segments or 5 Grids @ 12 segments or 6 Grids @ 11 Segments or 7 Grids @ 10 Segments. 
+  *        Also supports a scanned keyboard of upto 20 keys.
+  *        SPI bus interface device. 
+  *
+  *  @param  PinName mosi, miso, sclk, cs SPI bus pins
+  *  @param  Mode selects either Grids/Segments (default 7 Grids @ 10 Segments)
+  */
+  PT6964(PinName mosi, PinName miso, PinName sclk, PinName cs, Mode mode=Grid7_Seg10);
+      
+  /** Clear the screen and locate to 0
+   */ 
+  void cls();  
+
+  /** Write databyte to PT6964
+   *  @param  int address display memory location to write byte
+   *  @param  char data byte written at given address
+   *  @return none
+   */ 
+  void writeData(int address, char data); 
+ 
+ /** Write Display datablock to PT6964
+   *  @param  DisplayData_t data Array of PT6964_DISPLAY_MEM (=14) bytes for displaydata (starting at address 0)
+   *  @param  length number bytes to write (valid range 0..PT6964_DISPLAY_MEM (=14), starting at address 0)   
+   *  @return none
+   */   
+  void writeData(DisplayData_t data, int length = PT6964_DISPLAY_MEM);
+
+  /** Read keydata block from PT6964
+   *  @param  *keydata Ptr to Array of PT6964_KEY_MEM (=5) bytes for keydata
+   *  @return bool keypress True when at least one key was pressed
+   *
+   * Note: Due to the hardware configuration the PT6964 key matrix scanner will detect multiple keys pressed at same time,
+   *       but this may result in some spurious keys also being set in keypress data array.
+   *       It may be best to ignore all keys in those situations. That option is implemented in this method depending on #define setting.
+   */   
+  bool getKeys(KeyData_t *keydata);
+
+  /** Set Brightness
+    *
+    * @param  char brightness (3 significant bits, valid range 0..7 (1/16 .. 14/14 dutycycle)  
+    * @return none
+    */
+  void setBrightness(char brightness = PT6964_BRT_DEF);
+  
+  /** Set the Display mode On/off
+    *
+    * @param bool display mode
+    */
+  void setDisplay(bool on);
+  
+ private:  
+  SPI _spi;
+  DigitalOut _cs;
+  Mode _mode;
+  char _display;
+  char _bright; 
+  
+  /** Init the SPI interface and the controller
+    * @param  none
+    * @return none
+    */ 
+  void _init();
+
+  /** Helper to reverse all command or databits. The PT6964 expects LSB first, whereas SPI is MSB first
+    *  @param  char data
+    *  @return bitreversed data
+    */ 
+  char _flip(char data);
+
+  /** Write command and parameter to PT6964
+    *  @param  int cmd Command byte
+    *  &Param  int data Parameters for command
+    *  @return none
+    */ 
+  void _writeCmd(int cmd, int data);  
+};
+
+
+
+// Derived class for PT6964 used in DVD-538A front display unit
+//
+
+#define DVD538A_NR_GRIDS  5
+#define DVD538A_NR_DIGITS 4
+#define DVD538A_DIG1_IDX  1
+#define DVD538A_NR_UDC    8
+
+/** Constructor for class for driving Princeton PT6964 controller as used in DVD538A
+  *
+  *  @brief Supports 4 Digits of 7 Segments, 1 Grid of 9 Icons. Also supports a scanned keyboard of 4 keys.
+  *  
+  *  @param  PinName mosi, miso, sclk, cs SPI bus pins
+  */
+class PT6964_DVD538A : public PT6964, public Stream {
+ public:
+
+  /** Enums for Icons */
+  //  Grid encoded in 16 MSBs, Icon pattern encoded in 16 LSBs
+  enum Icon {
+    Grid1_LD1  = (1<<16) | S_LD1,
+    Grid1_LD2  = (1<<16) | S_LD2,
+    Grid1_CD   = (1<<16) | S_CD,
+    Grid1_DVD  = (1<<16) | S_DVD,
+    Grid1_PSE  = (1<<16) | S_PSE,
+    Grid1_PLY  = (1<<16) | S_PLY,    
+    Grid1_COL  = (1<<16) | S_COL,
+    Grid1_MP4  = (1<<16) | S_MP4,
+    Grid1_MP3  = (1<<16) | S_MP3    
+  };
+  
+  typedef char UDCData_t[DVD538A_NR_UDC][2];
+  
+ /** Constructor for class for driving Princeton PT6964 VFD controller as used in DVD538A
+   *
+   * @brief Supports 4 Digits of 7 Segments, 1 Grid of 9 Icons. Also supports a scanned keyboard of 4 keys.
+   *  
+   * @param  PinName mosi, miso, sclk, cs SPI bus pins
+   */
+  PT6964_DVD538A(PinName mosi, PinName miso, PinName sclk, PinName cs);
+
+#if DOXYGEN_ONLY
+    /** Write a character to the Display
+     *
+     * @param c The character to write to the display
+     */
+    int putc(int c);
+
+    /** Write a formatted string to the Display
+     *
+     * @param format A printf-style format string, followed by the
+     *               variables to use in formatting the string.
+     */
+    int printf(const char* format, ...);   
+#endif
+
+     /** Locate cursor to a screen column
+     *
+     * @param column  The horizontal position from the left, indexed from 0
+     */
+    void locate(int column);
+    
+    /** Clear the screen and locate to 0
+     */
+    void cls();
+
+    /** Set Icon
+     *
+     * @param Icon icon Enums Icon has Grid position encoded in 16 MSBs, Icon pattern encoded in 16 LSBs
+     * @return none
+     */
+    void setIcon(Icon icon);
+
+    /** Clr Icon
+     *
+     * @param Icon icon Enums Icon has Grid position encoded in 16 MSBs, Icon pattern encoded in 16 LSBs
+     * @return none
+     */
+    void clrIcon(Icon icon);
+
+   /** Set User Defined Characters (UDC)
+     *
+     * @param unsigned char udc_idx   The Index of the UDC (0..7)
+     * @param int udc_data            The bitpattern for the UDC (16 bits)       
+     */
+    void setUDC(unsigned char udc_idx, int udc_data);
+
+
+   /** Number of screen columns
+    *
+    * @param none
+    * @return columns
+    */
+    int columns();   
+
+   /** Write Display datablock to PT6964
+    *  @param  DisplayData_t data Array of PT6964_DISPLAY_MEM (=14) bytes for displaydata (starting at address 0)
+    *  @param  length number bytes to write (valid range 0..(DVD538A_NR_GRIDS*2) (=14), starting at address 0)   
+    *  @return none
+    */   
+    void writeData(DisplayData_t data, int length = (DVD538A_NR_GRIDS*2)) {
+      PT6964::writeData(data, length);
+    }  
+
+protected:  
+    // Stream implementation functions
+    virtual int _putc(int value);
+    virtual int _getc();
+
+private:
+    int _column;
+    int _columns;   
+    
+    DisplayData_t _displaybuffer;
+    UDCData_t _UDC_16S; 
+};
+
+
+#endif
\ No newline at end of file