Arduino code for P9813 pixels (e.g. Grove chainable RGB module)

p9813.ino

/* Arduino code for P9813 pixels (e.g. Grove chainable RGB module)
 *
 * Originally from:
 * http://auschristmaslighting.com/forums/index.php/topic,1261.msg15498.html#msg15498
 */

#define uint8 unsigned char
#define uint16 unsigned int
#define uint32 unsigned long int

// connect to digital 0,1
int Clkpin = 5;
int Datapin = 6;

void ClkProduce(void)
{
  digitalWrite(Clkpin, LOW);
  delayMicroseconds(20);
  digitalWrite(Clkpin, HIGH);
  delayMicroseconds(20);
}

void Send32Zero(void)
{
  unsigned char i;

  for (i=0; i<32; i++) {
    digitalWrite(Datapin, LOW);
    ClkProduce();
  }
}

uint8 TakeAntiCode(uint8 dat)
{
  uint8 tmp = 0;

  if ((dat & 0x80) == 0) {
    tmp |= 0x02;
  }

  if ((dat & 0x40) == 0) {
    tmp |= 0x01;
  }

  return tmp;
}

// gray data
void DatSend(uint32 dx)
{
  uint8 i;

  for (i=0; i<32; i++) {
    if ((dx & 0x80000000) != 0) {
      digitalWrite(Datapin, HIGH);
    } else {
      digitalWrite(Datapin, LOW);
    }
    dx <<= 1;
    ClkProduce();
  }
}

// data processing
void DataDealWithAndSend(uint8 r, uint8 g, uint8 b)
{
  uint32 dx = 0;

  dx |= (uint32)0x03 << 30;             // highest two bits 1，flag bits
  dx |= (uint32)TakeAntiCode(b) << 28;
  dx |= (uint32)TakeAntiCode(g) << 26;
  dx |= (uint32)TakeAntiCode(r) << 24;

  dx |= (uint32)b << 16;
  dx |= (uint32)g << 8;
  dx |= r;

  DatSend(dx);
}

int t = 0;     // Loop counter
int incomingByte[10];

void setup()
{
  Serial.begin(9600);        // set up Serial at 9600 bps
  pinMode(Datapin, OUTPUT);
  pinMode(Clkpin, OUTPUT);
  Send32Zero(); // blank all outputs in string
  //Feel free to leave this next section out until ^^^^ if you don't want to see when the Arduino inits
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  DataDealWithAndSend(255, 255, 255);
  Send32Zero();
  delay(50);
  Send32Zero(); // blank all outputs in string
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  DataDealWithAndSend(0, 0, 0);
  Send32Zero();
  // ^^^^^^^
}
void loop()
{
   if (Serial.available() >= 36) {
    // read the oldest byte in the serial buffer:
    for (int t=1; t<37; t++) {
      // read each byte
      incomingByte[t] = Serial.read();
    }

    Send32Zero(); // output data to first 3 nodes (The others are neglected for testing purposes)
    DataDealWithAndSend(incomingByte[1], incomingByte[2], incomingByte[3]);
    DataDealWithAndSend(incomingByte[4], incomingByte[5], incomingByte[6]);
    DataDealWithAndSend(incomingByte[7], incomingByte[8], incomingByte[9]);
    DataDealWithAndSend(incomingByte[10], incomingByte[11], incomingByte[12]);
    DataDealWithAndSend(incomingByte[13], incomingByte[14], incomingByte[15]);
    DataDealWithAndSend(incomingByte[16], incomingByte[17], incomingByte[18]);
    DataDealWithAndSend(incomingByte[19], incomingByte[20], incomingByte[21]);
    DataDealWithAndSend(incomingByte[22], incomingByte[23], incomingByte[24]);
    DataDealWithAndSend(incomingByte[25], incomingByte[26], incomingByte[27]);
    DataDealWithAndSend(incomingByte[28], incomingByte[29], incomingByte[30]);
    DataDealWithAndSend(incomingByte[31], incomingByte[32], incomingByte[33]);
    DataDealWithAndSend(incomingByte[34], incomingByte[35], incomingByte[36]);
    Send32Zero();
  }
}