led.ino

// based on https://gist.github.com/nrdobie/8193350

#include <SPI.h>

#define LOAD_PIN 7

void setup() {
  // Set load pin to output
  pinMode(LOAD_PIN, OUTPUT);

  // Reverse the SPI transfer to send the MSB first
  SPI.setBitOrder(MSBFIRST);
  
  // Start SPI
  SPI.begin();

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x0F);
  SPI.transfer(0x01);
  digitalWrite(LOAD_PIN, HIGH);

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x0F);
  SPI.transfer(0x00);
  digitalWrite(LOAD_PIN, HIGH);

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x09);
  SPI.transfer(0x00);
  digitalWrite(LOAD_PIN, HIGH);

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x0A);
  SPI.transfer(0x00);
  digitalWrite(LOAD_PIN, HIGH);

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x0B);
  SPI.transfer(0x00);
  digitalWrite(LOAD_PIN, HIGH);

  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x0C);
  SPI.transfer(0x01);
  digitalWrite(LOAD_PIN, HIGH);
}

void loop() {
  digitalWrite(LOAD_PIN, LOW);
  SPI.transfer(0x01);
  SPI.transfer(0x04);
  digitalWrite(LOAD_PIN, HIGH);
}