Joel Rosiene
Routines to drive a chain of APA102 Leds.
Fork of
APA102a
by 
Joel Rosiene
APA102a.cpp@8:3bb15df4903d, 2015-04-07 (annotated)
- Committer:
- rosienej
- Date:
- Tue Apr 07 13:55:11 2015 +0000
- Revision:
- 8:3bb15df4903d
- Parent:
- 6:5d4edfc955f3
corrected the end condition
Who changed what in which revision?
| User | Revision | Line number | New 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 | 8:3bb15df4903d | 28 | int end_count; |
| rosienej | 3:bf8c63d10824 | 29 | unsigned int val; |
| rosienej | 3:bf8c63d10824 | 30 | |
| rosienej | 3:bf8c63d10824 | 31 | _spi.write(0X00); // Start |
| rosienej | 3:bf8c63d10824 | 32 | _spi.write(0X00); |
| rosienej | 3:bf8c63d10824 | 33 | _spi.write(0X00); |
| rosienej | 3:bf8c63d10824 | 34 | _spi.write(0X00); |
| rosienej | 3:bf8c63d10824 | 35 | |
| rosienej | 3:bf8c63d10824 | 36 | for(int r = 0;r<NR;r++) |
| rosienej | 3:bf8c63d10824 | 37 | { |
| rosienej | 3:bf8c63d10824 | 38 | for(int c = off;c<(NC+off);c++) |
| rosienej | 3:bf8c63d10824 | 39 | { |
| rosienej | 8:3bb15df4903d | 40 | // int cc = (WF)?(c%NS):((c<NS)?c:NS); |
| rosienej | 4:2afea45fce8f | 41 | // if (ZF) |
| rosienej | 4:2afea45fce8f | 42 | // { if((r&0x01)>0) |
| rosienej | 8:3bb15df4903d | 43 | // index = r*NS + NC+off-cc; |
| rosienej | 4:2afea45fce8f | 44 | // else |
| rosienej | 4:2afea45fce8f | 45 | // index = r*NS + cc;} |
| rosienej | 4:2afea45fce8f | 46 | // else |
| rosienej | 4:2afea45fce8f | 47 | index = r*NS + c; |
| rosienej | 3:bf8c63d10824 | 48 | |
| rosienej | 3:bf8c63d10824 | 49 | val = Buf[index]; |
| rosienej | 3:bf8c63d10824 | 50 | _spi.write((val>>24)&0xFF); |
| rosienej | 3:bf8c63d10824 | 51 | _spi.write((val>>16)&0xFF); |
| rosienej | 3:bf8c63d10824 | 52 | _spi.write((val>>8)&0xFF); |
| rosienej | 3:bf8c63d10824 | 53 | _spi.write(val&0xFF); |
| rosienej | 3:bf8c63d10824 | 54 | } |
| rosienej | 3:bf8c63d10824 | 55 | } |
| rosienej | 8:3bb15df4903d | 56 | |
| rosienej | 8:3bb15df4903d | 57 | end_count = ((NR*NC)>>1); |
| rosienej | 8:3bb15df4903d | 58 | while (end_count>0){ |
| rosienej | 8:3bb15df4903d | 59 | _spi.write(0XFF); // Stop |
| rosienej | 8:3bb15df4903d | 60 | end_count = end_count-8; |
| rosienej | 8:3bb15df4903d | 61 | } |
| rosienej | 8:3bb15df4903d | 62 | // _spi.write(0XFF); |
| rosienej | 8:3bb15df4903d | 63 | // _spi.write(0XFF); |
| rosienej | 8:3bb15df4903d | 64 | // _spi.write(0XFF); |
| rosienej | 3:bf8c63d10824 | 65 | |
| rosienej | 3:bf8c63d10824 | 66 | } |