ledSign.cpp

00001 #include "ledSign.h"
00002 
00003 // Sign Output Pins
00004 
00005 BusOut address(p17, p18, p19, p20); // Address 0 to 16
00006 BusOut colour(p15, p16);            // 0 = off, 1 = red, 2 = green, 3 = orange
00007 
00008 DigitalOut abTop(p14);              // bank A or B switch for Top Row - 0 = A, 1 = B
00009 DigitalOut clkTop(p13);             // clock for Top Row
00010 DigitalOut weTop(p28);              // Write Enable for Top Row
00011 DigitalOut aeTop(p27);              // Address Enable for Top Row
00012 DigitalOut enbTop(p26);             // Enable for Top Row
00013 
00014 DigitalOut abBot(p25);              // bank A or B switch for Bottom Row - 0 = A, 1 = B
00015 DigitalOut clkBot(p24);             // clock for Bottom Row
00016 DigitalOut weBot(p23);              // Write Enable for Bottom Row
00017 DigitalOut aeBot(p22);              // Address Enable for Bottom Row
00018 DigitalOut enbBot(p21);             // Enable for Bottom Row
00019 
00020 LedSign::LedSign() {
00021     address = 0;
00022     colour = 0;
00023     abTop = 0;
00024     clkTop = 0;
00025     weTop = 0;
00026     aeTop = 0;
00027     enbTop = 0;
00028     abBot = 0;
00029     clkBot = 0;
00030     weBot = 0;
00031     aeBot = 0;
00032     enbBot = 0;
00033 }
00034 
00035 void LedSign::enable() {
00036     enbTop = 1;
00037     enbBot = 1;
00038 }
00039 
00040 void LedSign::disable() {
00041     enbTop = 0;
00042     enbBot = 0;
00043 }
00044 
00045 void LedSign::swapBank() {
00046     (abTop) ? abTop = 0 : abTop = 1;
00047     (abBot) ? abBot = 0 : abBot = 1;
00048 }
00049 
00050 void LedSign::writeRow(int * pointer, int wRow) {
00051     if(wRow <= 15) {
00052         for(int col = 0; col < 128; col++) {
00053             colour = *(pointer + col);
00054             clockTop();
00055         }
00056         
00057         writeTop(wRow);
00058     }
00059     if(wRow >= 16) {
00060         for(int col = 0; col < 128; col++) {
00061             colour = *(pointer + col);
00062             clockBot();
00063         }
00064         
00065         writeBot(wRow - 16);
00066     }
00067 }
00068 
00069 void LedSign::writeScreenColour(int newColour) {
00070     colour = newColour; //set colour to write to screen
00071     for (int i=0; i<128; i++) { // clock in 128 bits to turn all the LED's on
00072         clockIn();
00073     }
00074 
00075     for (int i=0; i<16; i++) { //actually write them for all lines
00076         writeTop(i);
00077         writeBot(i);
00078     }
00079 
00080     swapBank();
00081 
00082 }
00083 
00084 //********************Private Declerations********************
00085 
00086 void LedSign::writeTop(int topAddress) {
00087     address = topAddress;
00088     aeTop = 1;
00089     wait_us(1);
00090     weTop = 1;
00091     wait_us(1);
00092     weTop = 0;
00093     wait_us(1);
00094     aeTop = 0;
00095     wait_us(1);
00096 }
00097 
00098 void LedSign::writeBot(int botAddress) {
00099     address = botAddress;
00100     aeBot = 1;
00101     wait_us(1);
00102     weBot = 1;
00103     wait_us(1);
00104     weBot = 0;
00105     wait_us(1);
00106     aeBot = 0;
00107     wait_us(1);
00108 }
00109 
00110 void LedSign::clockTop() {
00111     wait_us(1);
00112     clkTop = 1;
00113     wait_us(1);
00114     clkTop = 0;
00115     wait_us(1);
00116 }
00117 
00118 void LedSign::clockBot() {
00119     wait_us(1);
00120     clkBot = 1;
00121     wait_us(1);
00122     clkBot = 0;
00123     wait_us(1);
00124 }
00125 
00126 void LedSign::clockIn() {
00127     wait_us(1);
00128     clkTop = 1;
00129     clkBot = 1;
00130     wait_us(1);
00131     clkTop = 0;
00132     clkBot = 0;
00133     wait_us(1);
00134 }