/* * 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 #if (ARDUINO >= 100) #include #else #include #endif /* * Segments to be switched on for characters and digits on * 7-Segment Displays */ const static byte charTable[128] = { 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,B00000000,B00000000, 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