APA102.cpp

00001 #include "APA102.h"
00002 #include "mbed.h"
00003 
00004 APA102::APA102(PinName mosi,PinName miso,PinName sclk,int rate)
00005         : _spi(mosi, miso, sclk)
00006       
00007         {
00008             // Setup the spi for 8 bit data, high steady state clock,
00009             // second edge capture, with a 1MHz clock rate
00010             _spi.format(8,3);
00011             _spi.frequency(rate);
00012         } 
00013         
00014 void APA102::SetBuffer(unsigned int Buffer[],int Rows,int Cols, int Stride,int Offset, bool ZigZag,bool Wrap)
00015 {
00016     Buf = Buffer;
00017     NR = Rows;
00018     NC = Cols;
00019     NS = Stride;
00020     off = Offset;
00021     ZF = ZigZag;
00022     WF = Wrap;
00023     }
00024     
00025 void APA102::Repaint()
00026 {   
00027     int index;
00028     unsigned int val;
00029     
00030     _spi.write(0X00);  // Start
00031     _spi.write(0X00);
00032     _spi.write(0X00);
00033     _spi.write(0X00);
00034     
00035     for(int r = 0;r<NR;r++)
00036     {
00037         for(int c = off;c<(NC+off);c++)
00038         {
00039             int cc = (WF)?(c%NS):((c<NS)?c:NS);
00040             if (ZF) 
00041                if((r&0x01)>0)
00042                     index = r*NS + NC+off-cc;
00043                 else
00044                     index = r*NS + cc;
00045             else 
00046                 index = r*NS + cc;
00047                 
00048             val = Buf[index];
00049             _spi.write((val>>24)&0xFF);  
00050             _spi.write((val>>16)&0xFF);  
00051             _spi.write((val>>8)&0xFF);  
00052             _spi.write(val&0xFF);  
00053         }
00054     }
00055     _spi.write(0XFF); // Stop
00056     _spi.write(0XFF);
00057     _spi.write(0XFF);
00058     _spi.write(0XFF);
00059     
00060 }