Diff: PT6964.cpp

Revision:

0:27f32a087e5a

Child:

1:1adf993a3e34

--- /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;
+}