wiringpi_apa102.cpp

#include <wiringPi.h>
#include <wiringPiSPI.h>
#include <iostream>
#include <stdint.h>

int main() {
  wiringPiSetup();
  if(wiringPiSPISetup(0, 6000000) < 0) {
    std::cerr << "wiringPiSPISetup failed" << std::endl;
  }

  uint8_t buf[1];
  for(int i = 0; i < 4; i++) {
    buf[0] = 0x00;
    wiringPiSPIDataRW(0, buf, 1);
  }

  uint8_t r, g, b, brightness;
  r = 0xFF;
  g = 0x00;
  b = 0x00;
  brightness = 15;
  uint8_t led_frame[4];

  for(int i = 0; i < 8; i++) {
    led_frame[0] = 0b11100000 | (0b00011111 & brightness);
    led_frame[1] = b;
    led_frame[2] = g;
    led_frame[3] = r;

    wiringPiSPIDataRW(0, led_frame, 4);
  }

  for(int i = 0; i < 4; i++) {
    buf[0] = 0xFF;
    wiringPiSPIDataRW(0, buf, 1);
  }

  return 0;
}