main.cpp

00001 // WS2803_Testing_MBED
00002 // By Thomas Olson
00003 // teo20130210.01
00004 // MBED LPC1768
00005 // WS2803 pin4 CKI -> ws2803_clockPin(p21)
00006 // WS2803 pin5 SDI -> ws2803_dataPin(p22)
00007 
00008 
00009 #include "mbed.h"
00010 
00011 DigitalOut ws2803_clockPin(p21);
00012 DigitalOut ws2803_dataPin(p22);
00013 
00014 #define nLEDs 18
00015 #define nBARs 2         // Number of WS2803 chained together
00016 
00017 uint8_t ledBar[nBARs][nLEDs];
00018 
00019 void shiftOut(uint8_t sodata) {
00020     for(int i = 7; i >= 0; i--) {
00021         ws2803_clockPin = 0;
00022         if(sodata & (0x01 << i)){
00023             ws2803_dataPin = 1;
00024         } else {
00025             ws2803_dataPin = 0;
00026         }
00027         wait_us(1);
00028         ws2803_clockPin = 1;
00029         wait_us(1);
00030         ws2803_clockPin = 0;
00031     }
00032 }
00033 
00034 void loadWS2803(){
00035   for(int wsBar = 0; wsBar < nBARs; wsBar++){
00036     for (int wsOut = 0; wsOut < nLEDs; wsOut++){
00037       shiftOut(ledBar[nBARs-(wsBar+1)][wsOut]);
00038     }
00039   }
00040   ws2803_clockPin = 0;
00041   wait_us(600); // 500us-600us needed to reset WS2803s
00042 }
00043 
00044 void clearWS2803(){
00045         for(int wsOut = 0; wsOut < nLEDs; wsOut++){
00046                 ledBar[0][wsOut] = ledBar[1][wsOut] = 0x00;
00047                 loadWS2803();
00048         }
00049 }
00050 
00051 int main() {
00052     // initialize WS2803s
00053     ws2803_clockPin = 0;
00054     wait_us(600);
00055    
00056     while(1) {
00057         clearWS2803();
00058         wait(2.0);
00059         // Chase mode
00060         for(int iOut=7; iOut < 256; iOut*=2){
00061             for(int wsOut = 0; wsOut < nLEDs; wsOut++){
00062                 ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
00063                 loadWS2803();
00064                 clearWS2803();
00065             }
00066         }
00067 
00068         wait(2.0);    
00069         //parallel mode
00070         for(int iOut = 7; iOut < 64; iOut*=4){
00071                 for(int wsOut = 0; wsOut < nLEDs; wsOut++){
00072                         ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
00073                         loadWS2803();
00074                         wait_us(1000000);
00075                 }
00076                 wait_us(10000);
00077         }
00078     }// while(1)
00079 }