fxk1220 / apa102-led- Goto Github PK

1. check the SPI GPIO, input:
    gpio readall 

2. you can see the spidev0 is pin19 and pin21, shorcuri the pin19 and pin 21

3. ./demo
   you can get the spi read data ; 

test LED OK ;


APA102  data format:

SDI  [0*32]        [LED1]    [LED2]   [LED3]  [----]  [LEDn]   [1*32]
     Start Frame    LED Frame                                   END Frame

start Frame 32 bits  0 

LED Frame 32 bits 
MSB   LSB       MSB LSB 
| 111 Global |  BLUE | GREEN | RED |   
3bits  5bits    8bits   8 bits  8bits 

Global bits is 32 level brightness 
R G B 255 level color set 

END Frame 32 bits 1