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index.js
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var tessel = require('tessel');
var async = require('async');
var util = require('util');
var EventEmitter = require('events').EventEmitter;
// Screen is six rows (pages) with each byte being eight vertical pixels.
var LCD_WIDTH = 84
var LCD_HEIGHT = 48
var LCD_COMMAND = 0;
var LCD_DATA = 1;
var PCD8544_POWERDOWN = 0x04
var PCD8544_ENTRYMODE = 0x02
var PCD8544_EXTENDEDINSTRUCTION = 0x01
var PCD8544_DISPLAYBLANK = 0x0
var PCD8544_DISPLAYNORMAL = 0x4
var PCD8544_DISPLAYALLON = 0x1
var PCD8544_DISPLAYINVERTED = 0x5
// H = 0
var PCD8544_FUNCTIONSET = 0x20
var PCD8544_DISPLAYCONTROL = 0x08
var PCD8544_SETYADDR = 0x40
var PCD8544_SETXADDR = 0x80
// H = 1
var PCD8544_SETTEMP = 0x04
var PCD8544_SETBIAS = 0x10
var PCD8544_SETVOP = 0x80
//This table contains the hex values that represent pixels
//for a font that is 5 pixels wide and 8 pixels high
var ASCII = [[0x00, 0x00, 0x00, 0x00, 0x00], // 20
[0x00, 0x00, 0x5f, 0x00, 0x00], // 21 !
[0x00, 0x07, 0x00, 0x07, 0x00], // 22 "
[0x14, 0x7f, 0x14, 0x7f, 0x14], // 23 #
[0x24, 0x2a, 0x7f, 0x2a, 0x12], // 24 $
[0x23, 0x13, 0x08, 0x64, 0x62], // 25 %
[0x36, 0x49, 0x55, 0x22, 0x50], // 26 &
[0x00, 0x05, 0x03, 0x00, 0x00], // 27 '
[0x00, 0x1c, 0x22, 0x41, 0x00], // 28 (
[0x00, 0x41, 0x22, 0x1c, 0x00], // 29 )
[0x14, 0x08, 0x3e, 0x08, 0x14], // 2a *
[0x08, 0x08, 0x3e, 0x08, 0x08], // 2b +
[0x00, 0x50, 0x30, 0x00, 0x00], // 2c ,
[0x08, 0x08, 0x08, 0x08, 0x08], // 2d -
[0x00, 0x60, 0x60, 0x00, 0x00], // 2e .
[0x20, 0x10, 0x08, 0x04, 0x02], // 2f /
[0x3e, 0x51, 0x49, 0x45, 0x3e], // 30 0
[0x00, 0x42, 0x7f, 0x40, 0x00], // 31 1
[0x42, 0x61, 0x51, 0x49, 0x46], // 32 2
[0x21, 0x41, 0x45, 0x4b, 0x31], // 33 3
[0x18, 0x14, 0x12, 0x7f, 0x10], // 34 4
[0x27, 0x45, 0x45, 0x45, 0x39], // 35 5
[0x3c, 0x4a, 0x49, 0x49, 0x30], // 36 6
[0x01, 0x71, 0x09, 0x05, 0x03], // 37 7
[0x36, 0x49, 0x49, 0x49, 0x36], // 38 8
[0x06, 0x49, 0x49, 0x29, 0x1e], // 39 9
[0x00, 0x36, 0x36, 0x00, 0x00], // 3a :
[0x00, 0x56, 0x36, 0x00, 0x00], // 3b ;
[0x08, 0x14, 0x22, 0x41, 0x00], // 3c <
[0x14, 0x14, 0x14, 0x14, 0x14], // 3d =
[0x00, 0x41, 0x22, 0x14, 0x08], // 3e >
[0x02, 0x01, 0x51, 0x09, 0x06], // 3f ?
[0x32, 0x49, 0x79, 0x41, 0x3e], // 40 @
[0x7e, 0x11, 0x11, 0x11, 0x7e], // 41 A
[0x7f, 0x49, 0x49, 0x49, 0x36], // 42 B
[0x3e, 0x41, 0x41, 0x41, 0x22], // 43 C
[0x7f, 0x41, 0x41, 0x22, 0x1c], // 44 D
[0x7f, 0x49, 0x49, 0x49, 0x41], // 45 E
[0x7f, 0x09, 0x09, 0x09, 0x01], // 46 F
[0x3e, 0x41, 0x49, 0x49, 0x7a], // 47 G
[0x7f, 0x08, 0x08, 0x08, 0x7f], // 48 H
[0x00, 0x41, 0x7f, 0x41, 0x00], // 49 I
[0x20, 0x40, 0x41, 0x3f, 0x01], // 4a J
[0x7f, 0x08, 0x14, 0x22, 0x41], // 4b K
[0x7f, 0x40, 0x40, 0x40, 0x40], // 4c L
[0x7f, 0x02, 0x0c, 0x02, 0x7f], // 4d M
[0x7f, 0x04, 0x08, 0x10, 0x7f], // 4e N
[0x3e, 0x41, 0x41, 0x41, 0x3e], // 4f O
[0x7f, 0x09, 0x09, 0x09, 0x06], // 50 P
[0x3e, 0x41, 0x51, 0x21, 0x5e], // 51 Q
[0x7f, 0x09, 0x19, 0x29, 0x46], // 52 R
[0x46, 0x49, 0x49, 0x49, 0x31], // 53 S
[0x01, 0x01, 0x7f, 0x01, 0x01], // 54 T
[0x3f, 0x40, 0x40, 0x40, 0x3f], // 55 U
[0x1f, 0x20, 0x40, 0x20, 0x1f], // 56 V
[0x3f, 0x40, 0x38, 0x40, 0x3f], // 57 W
[0x63, 0x14, 0x08, 0x14, 0x63], // 58 X
[0x07, 0x08, 0x70, 0x08, 0x07], // 59 Y
[0x61, 0x51, 0x49, 0x45, 0x43], // 5a Z
[0x00, 0x7f, 0x41, 0x41, 0x00], // 5b [
[0x02, 0x04, 0x08, 0x10, 0x20], // 5c \
[0x00, 0x41, 0x41, 0x7f, 0x00], // 5d ]
[0x04, 0x02, 0x01, 0x02, 0x04], // 5e ^
[0x40, 0x40, 0x40, 0x40, 0x40], // 5f _
[0x00, 0x01, 0x02, 0x04, 0x00], // 60 `
[0x20, 0x54, 0x54, 0x54, 0x78], // 61 a
[0x7f, 0x48, 0x44, 0x44, 0x38], // 62 b
[0x38, 0x44, 0x44, 0x44, 0x20], // 63 c
[0x38, 0x44, 0x44, 0x48, 0x7f], // 64 d
[0x38, 0x54, 0x54, 0x54, 0x18], // 65 e
[0x08, 0x7e, 0x09, 0x01, 0x02], // 66 f
[0x0c, 0x52, 0x52, 0x52, 0x3e], // 67 g
[0x7f, 0x08, 0x04, 0x04, 0x78], // 68 h
[0x00, 0x44, 0x7d, 0x40, 0x00], // 69 i
[0x20, 0x40, 0x44, 0x3d, 0x00], // 6a j
[0x7f, 0x10, 0x28, 0x44, 0x00], // 6b k
[0x00, 0x41, 0x7f, 0x40, 0x00], // 6c l
[0x7c, 0x04, 0x18, 0x04, 0x78], // 6d m
[0x7c, 0x08, 0x04, 0x04, 0x78], // 6e n
[0x38, 0x44, 0x44, 0x44, 0x38], // 6f o
[0x7c, 0x14, 0x14, 0x14, 0x08], // 70 p
[0x08, 0x14, 0x14, 0x18, 0x7c], // 71 q
[0x7c, 0x08, 0x04, 0x04, 0x08], // 72 r
[0x48, 0x54, 0x54, 0x54, 0x20], // 73 s
[0x04, 0x3f, 0x44, 0x40, 0x20], // 74 t
[0x3c, 0x40, 0x40, 0x20, 0x7c], // 75 u
[0x1c, 0x20, 0x40, 0x20, 0x1c], // 76 v
[0x3c, 0x40, 0x30, 0x40, 0x3c], // 77 w
[0x44, 0x28, 0x10, 0x28, 0x44], // 78 x
[0x0c, 0x50, 0x50, 0x50, 0x3c], // 79 y
[0x44, 0x64, 0x54, 0x4c, 0x44], // 7a z
[0x00, 0x08, 0x36, 0x41, 0x00], // 7b {
[0x00, 0x00, 0x7f, 0x00, 0x00], // 7c |
[0x00, 0x41, 0x36, 0x08, 0x00], // 7d }
[0x10, 0x08, 0x08, 0x10, 0x08], // 7e ~
[0x78, 0x46, 0x41, 0x46, 0x78], // 7f DEL
];
function Nokia5110 (hardware, cb){
var self = this;
self.hardware = hardware;
self.sce = hardware.pin['G1'].output().low();
self.dc = hardware.pin['G2'].output().low();
self.backlight = hardware.pin['G3'].output().low();
self.spi = new hardware.SPI({
clockSpeed: 8 * 1000000,
dataMode: 0
});
self._lcdWrite = function(mode, data, cb){
var self = this;
self.dc.output(mode);
self.sce.low();
self.spi.send(new Buffer([data]), function (err){
self.sce.high();
cb(err);
});
};
async.series([
function(callback){
// get into the EXTENDED mode!
self._lcdWrite(LCD_COMMAND, PCD8544_FUNCTIONSET | PCD8544_EXTENDEDINSTRUCTION, callback);
},
function(callback){
// LCD bias select (4 is optimal?)
self._lcdWrite(LCD_COMMAND, PCD8544_SETBIAS | 0x4, callback);
},
function(callback){
// set VOP
var contrast = 0x3a;
// You can play around with this value depending on your screen
self._lcdWrite(LCD_COMMAND, PCD8544_SETVOP | contrast, callback);
},
function(callback){
// normal mode
self._lcdWrite(LCD_COMMAND, PCD8544_FUNCTIONSET, callback);
},
function(callback){
// Set display to Normal
self._lcdWrite(LCD_COMMAND, PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYNORMAL, callback);
}
],
function(err, results){
self.emit('ready');
if(cb)
cb(err, self);
});
};
// Inherit event emission
util.inherits(Nokia5110, EventEmitter);
// Define the API
Nokia5110.prototype.gotoXY = function (x, y, cb){
var self = this;
async.series([
function(callback){
self._lcdWrite(LCD_COMMAND, 0x80 | x, callback);
},
function(callback){
self._lcdWrite(LCD_COMMAND, 0x40 | y, callback);
}
], function(err, results){
cb(err);
});
};
Nokia5110.prototype.character = function (character, cb){
var self = this;
var charIndex = character.charCodeAt(0) - 0x20;
this.rawCharacter(ASCII[charIndex], cb);
};
/**
* Print a raw character data
*
* @params array character Pixel data for character as defined in ASCII
* array
* @params function cb Completition callback function
*/
Nokia5110.prototype.rawCharacter = function (character, cb){
var self = this;
//var charIndex = character.charCodeAt(0) - 0x20;
async.series([
function(callback){
self._lcdWrite(LCD_DATA, 0x00, callback);
},
function(callback){
self._lcdWrite(LCD_DATA, character[0], callback);
},
function(callback){
self._lcdWrite(LCD_DATA, character[1], callback);
},
function(callback){
self._lcdWrite(LCD_DATA, character[2], callback);
},
function(callback){
self._lcdWrite(LCD_DATA, character[3], callback);
},
function(callback){
self._lcdWrite(LCD_DATA, character[4], callback);
},
], function(err, results){
cb(err);
});
};
Nokia5110.prototype.string = function (data, cb){
var self = this;
async.eachSeries(data, function(character, callback){
self.character(character, callback);
},
function(err, results){
if(cb)
cb(err);
});
};
Nokia5110.prototype.bitmap = function (bitmapData, cb){
var self = this;
async.eachSeries(bitmapData, function(dataPoint, callback){
self._lcdWrite(LCD_DATA, dataPoint, callback);
},
function(err, results){
if(cb)
cb(err);
});
};
Nokia5110.prototype.clear = function (cb){
var self = this;
async.timesSeries(LCD_WIDTH * LCD_HEIGHT / 8, function(n, next){
self._lcdWrite(LCD_DATA, 0x00, next);
},
function(err, results){
self.gotoXY(0,0, cb); // After clearing the display return to the home position
});
};
Nokia5110.prototype.setBacklight = function (state){
var self = this;
self.backlight.output(state);
};
// Every module needs a use function which calls the constructor
function use (hardware, callback) {
return new Nokia5110(hardware, callback);
}
// Export functions
exports.use = use;
/*
exports.use = function (port, cb)
{
var PIN_SCE = port.pin['G1'].output().low();
var PIN_DC = port.pin['G2'].output().low();
var PIN_BACKLIGHT = port.pin['G3'].output().low();
var spi = new port.SPI({
clockSpeed: 8 * 1000000,
dataMode: 0
});
function lcdWrite (mode, data, cb) {
PIN_DC.output(mode);
PIN_SCE.low();
spi.send(new Buffer([data]), function (){
PIN_SCE.high();
cb(null, data);
});
}
function lcdInit (cb) {
// rst.high();
async.series([
function(callback){
// get into the EXTENDED mode!
lcdWrite(LCD_COMMAND, PCD8544_FUNCTIONSET | PCD8544_EXTENDEDINSTRUCTION, callback);
},
function(callback){
// LCD bias select (4 is optimal?)
lcdWrite(LCD_COMMAND, PCD8544_SETBIAS | 0x4, callback);
},
function(callback){
// set VOP
var contrast = 0x3a;
// You can play around with this value depending on your screen
lcdWrite(LCD_COMMAND, PCD8544_SETVOP | contrast, callback);
},
function(callback){
// normal mode
lcdWrite(LCD_COMMAND, PCD8544_FUNCTIONSET, callback);
},
function(callback){
// Set display to Normal
lcdWrite(LCD_COMMAND, PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYNORMAL, callback);
}
],
function(err, results){
cb();
});
}
function gotoXY(x, y, cb){
async.series([
function(callback){
lcdWrite(LCD_COMMAND, 0x80 | x, callback);
},
function(callback){
lcdWrite(LCD_COMMAND, 0x40 | y, callback);
}
], function(err, results){
cb();
});
}
function lcdCharacter(character, cb){
var charIndex = character.charCodeAt(0) - 0x20;
async.series([
function(callback){
lcdWrite(LCD_DATA, 0x00, callback);
},
function(callback){
lcdWrite(LCD_DATA, ASCII[charIndex][0], callback);
},
function(callback){
lcdWrite(LCD_DATA, ASCII[charIndex][1], callback);
},
function(callback){
lcdWrite(LCD_DATA, ASCII[charIndex][2], callback);
},
function(callback){
lcdWrite(LCD_DATA, ASCII[charIndex][3], callback);
},
function(callback){
lcdWrite(LCD_DATA, ASCII[charIndex][4], callback);
},
], function(err, results){
cb();
});
}
function lcdString(data, cb){
async.eachSeries(data, function(character, callback){
lcdCharacter(character, callback);
},
function(err, results){
if(cb){
cb();
}
});
}
function lcdBitmap(data, callback){
async.eachSeries(tessel_logo, function(dataPoint, callback){
lcdWrite(LCD_DATA, dataPoint, callback);
},
function(err, results){
if(callback) callback();
});
}
function lcdClear(cb){
async.timesSeries(LCD_WIDTH * LCD_HEIGHT / 8, function(n, next){
lcdWrite(LCD_DATA, 0x00, next);
},
function(err, results){
gotoXY(0,0, cb); // After clearing the display return to the home position
});
}
function setBacklight(state){
PIN_BACKLIGHT.output(state);
}
var ret = {
width: LCD_WIDTH,
height: LCD_HEIGHT,
clear: lcdClear,
writeChar: lcdCharacter,
writeString: lcdString,
drawArray: lcdBitmap,
setBacklight: setBacklight
};
spi.initialize();
lcdInit(cb);
return ret;
}
*/