Joel Rosiene / APA102a

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Fork of APA102 by Joel Rosiene

APA102a.cpp@4:2afea45fce8f, 2015-03-14 (annotated)

Committer:
rosienej
Date:
Sat Mar 14 20:45:03 2015 +0000
Revision:
4:2afea45fce8f
Parent:
3:bf8c63d10824
Child:
5:863fb3a71efd
First release with demo code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rosienej 3:bf8c63d10824 1 #include "APA102a.h"
rosienej 3:bf8c63d10824 2 #include "mbed.h"
rosienej 3:bf8c63d10824 3
rosienej 4:2afea45fce8f 4 APA102a::APA102a(PinName mosi,PinName miso,PinName sclk,int rate)
rosienej 3:bf8c63d10824 5 : _spi(mosi, miso, sclk)
rosienej 3:bf8c63d10824 6
rosienej 3:bf8c63d10824 7 {
rosienej 3:bf8c63d10824 8 // Setup the spi for 8 bit data, high steady state clock,
rosienej 4:2afea45fce8f 9 // second edge capture, with clock rate
rosienej 3:bf8c63d10824 10 _spi.format(8,3);
rosienej 3:bf8c63d10824 11 _spi.frequency(rate);
rosienej 3:bf8c63d10824 12 }
rosienej 3:bf8c63d10824 13
rosienej 4:2afea45fce8f 14 void APA102a::SetBuffer(unsigned int Buffer[],int Rows,int Cols, int Stride,int Offset, bool ZigZag,bool Wrap)
rosienej 3:bf8c63d10824 15 {
rosienej 3:bf8c63d10824 16 Buf = Buffer;
rosienej 3:bf8c63d10824 17 NR = Rows;
rosienej 3:bf8c63d10824 18 NC = Cols;
rosienej 3:bf8c63d10824 19 NS = Stride;
rosienej 3:bf8c63d10824 20 off = Offset;
rosienej 3:bf8c63d10824 21 ZF = ZigZag;
rosienej 3:bf8c63d10824 22 WF = Wrap;
rosienej 3:bf8c63d10824 23 }
rosienej 3:bf8c63d10824 24
rosienej 4:2afea45fce8f 25 void APA102a::Repaint()
rosienej 3:bf8c63d10824 26 {
rosienej 3:bf8c63d10824 27 int index;
rosienej 3:bf8c63d10824 28 unsigned int val;
rosienej 3:bf8c63d10824 29
rosienej 3:bf8c63d10824 30 _spi.write(0X00); // Start
rosienej 3:bf8c63d10824 31 _spi.write(0X00);
rosienej 3:bf8c63d10824 32 _spi.write(0X00);
rosienej 3:bf8c63d10824 33 _spi.write(0X00);
rosienej 3:bf8c63d10824 34
rosienej 3:bf8c63d10824 35 for(int r = 0;r<NR;r++)
rosienej 3:bf8c63d10824 36 {
rosienej 3:bf8c63d10824 37 for(int c = off;c<(NC+off);c++)
rosienej 3:bf8c63d10824 38 {
rosienej 3:bf8c63d10824 39 int cc = (WF)?(c%NS):((c<NS)?c:NS);
rosienej 4:2afea45fce8f 40 // if (ZF)
rosienej 4:2afea45fce8f 41 // { if((r&0x01)>0)
rosienej 3:bf8c63d10824 42 index = r*NS + NC+off-cc;
rosienej 4:2afea45fce8f 43 // else
rosienej 4:2afea45fce8f 44 // index = r*NS + cc;}
rosienej 4:2afea45fce8f 45 // else
rosienej 4:2afea45fce8f 46 index = r*NS + c;
rosienej 3:bf8c63d10824 47
rosienej 3:bf8c63d10824 48 val = Buf[index];
rosienej 3:bf8c63d10824 49 _spi.write((val>>24)&0xFF);
rosienej 3:bf8c63d10824 50 _spi.write((val>>16)&0xFF);
rosienej 3:bf8c63d10824 51 _spi.write((val>>8)&0xFF);
rosienej 3:bf8c63d10824 52 _spi.write(val&0xFF);
rosienej 3:bf8c63d10824 53 }
rosienej 3:bf8c63d10824 54 }
rosienej 3:bf8c63d10824 55 _spi.write(0XFF); // Stop
rosienej 3:bf8c63d10824 56 _spi.write(0XFF);
rosienej 3:bf8c63d10824 57 _spi.write(0XFF);
rosienej 3:bf8c63d10824 58 _spi.write(0XFF);
rosienej 3:bf8c63d10824 59
rosienej 3:bf8c63d10824 60 }