text: /*
   *    LedControl.h - A library for controling Leds with a MAX7219/MAX7221
   *    Copyright (c) 2007 Eberhard Fahle
   * 
   *    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:
   * 
   *    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 LedControl_h
  #define LedControl_h
  
  #include <avr/pgmspace.h>
  
  #if (ARDUINO >= 100)
  #include <Arduino.h>
  #else
  #include <WProgram.h>
  #endif
  
  /*
   * Segments to be switched on for characters and digits on
   * 7-Segment Displays
   */
  const static byte charTable [] PROGMEM  = {
      B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000,
      B01111111,B01111011,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,
      B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B00000000,B00000000,B00000000,B10000000,B00000001,B10000000,B00000000,
      B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000,
      B01111111,B01111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000,
      B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00000000,B00000000,
      B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00001000,
      B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000,
      B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00010101,B00011101,
      B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
      B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000
  };
  
  class LedControl {
      private :
          /* The array for shifting the data to the devices */
          byte spidata[16];
          /* Send out a single command to the device */
          void spiTransfer(int addr, byte opcode, byte data);
  
          /* We keep track of the led-status for all 8 devices in this array */
          byte status[64];
          /* Data is shifted out of this pin*/
          int SPI_MOSI;
          /* The clock is signaled on this pin */
          int SPI_CLK;
          /* This one is driven LOW for chip selectzion */
          int SPI_CS;
          /* The maximum number of devices we use */
          int maxDevices;
  
      public:
          /* 
           * Create a new controler 
           * Params :
           * dataPin		pin on the Arduino where data gets shifted out
           * clockPin		pin for the clock
           * csPin		pin for selecting the device 
           * numDevices	maximum number of devices that can be controled
           */
          LedControl(int dataPin, int clkPin, int csPin, int numDevices=1);
  
          /*
           * Gets the number of devices attached to this LedControl.
           * Returns :
           * int	the number of devices on this LedControl
           */
          int getDeviceCount();
  
          /* 
           * Set the shutdown (power saving) mode for the device
           * Params :
           * addr	The address of the display to control
           * status	If true the device goes into power-down mode. Set to false
           *		for normal operation.
           */
          void shutdown(int addr, bool status);
  
          /* 
           * Set the number of digits (or rows) to be displayed.
           * See datasheet for sideeffects of the scanlimit on the brightness
           * of the display.
           * Params :
           * addr	address of the display to control
           * limit	number of digits to be displayed (1..8)
           */
          void setScanLimit(int addr, int limit);
  
          /* 
           * Set the brightness of the display.
           * Params:
           * addr		the address of the display to control
           * intensity	the brightness of the display. (0..15)
           */
          void setIntensity(int addr, int intensity);
  
          /* 
           * Switch all Leds on the display off. 
           * Params:
           * addr	address of the display to control
           */
          void clearDisplay(int addr);
  
          /* 
           * Set the status of a single Led.
           * Params :
           * addr	address of the display 
           * row	the row of the Led (0..7)
           * col	the column of the Led (0..7)
           * state	If true the led is switched on, 
           *		if false it is switched off
           */
          void setLed(int addr, int row, int col, boolean state);
  
          /* 
           * Set all 8 Led's in a row to a new state
           * Params:
           * addr	address of the display
           * row	row which is to be set (0..7)
           * value	each bit set to 1 will light up the
           *		corresponding Led.
           */
          void setRow(int addr, int row, byte value);
  
          /* 
           * Set all 8 Led's in a column to a new state
           * Params:
           * addr	address of the display
           * col	column which is to be set (0..7)
           * value	each bit set to 1 will light up the
           *		corresponding Led.
           */
          void setColumn(int addr, int col, byte value);
  
          /* 
           * Display a hexadecimal digit on a 7-Segment Display
           * Params:
           * addr	address of the display
           * digit	the position of the digit on the display (0..7)
           * value	the value to be displayed. (0x00..0x0F)
           * dp	sets the decimal point.
           */
          void setDigit(int addr, int digit, byte value, boolean dp);
  
          /* 
           * Display a character on a 7-Segment display.
           * There are only a few characters that make sense here :
           *	'0','1','2','3','4','5','6','7','8','9','0',
           *  'A','b','c','d','E','F','H','L','P',
           *  '.','-','_',' ' 
           * Params:
           * addr	address of the display
           * digit	the position of the character on the display (0..7)
           * value	the character to be displayed. 
           * dp	sets the decimal point.
           */
          void setChar(int addr, int digit, char value, boolean dp);
  };
  
  #endif	//LedControl.h
  
  
  
  