Joel Rosiene / APA102a

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of APA102 by Joel Rosiene

APA102a.cpp@6:5d4edfc955f3, 2015-04-07 (annotated)

Committer:
rosienej
Date:
Tue Apr 07 01:41:17 2015 +0000
Revision:
6:5d4edfc955f3
Parent:
5:863fb3a71efd 
spi

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 6:5d4edfc955f3 8 // Setup the spi for 8 bit data, low steady state clock,
rosienej 5:863fb3a71efd 9 // second edge capture, with clock rate, clock active low, rising edge
rosienej 6:5d4edfc955f3 10 _spi.format(8,0);
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 }