// pass plus task q2
const int dataPin = 2;   /* DS */
const int clockPin = 3;  /* SHCP */
const int latchPin = 4;  /* STCP */
   // format is row1 leds,row2 etc
byte testimage[] = {B11000011,B11000011,B11000011,B11111111,B11111111,B11000011,B11000011,B11000011}; //H test
byte H[] = {B11000011,B11000011,B11000011,B11111111,B11111111,B11000011,B11000011,B11000011}; //H
byte O[] = {B11111111,B11111111,B11000011,B11000011,B11000011,B11000011,B11111111,B11111111}; //O
byte R[] = {B11111100,B11000011,B11000011,B11000011,B11111100,B11011000,B11001100,B11000110}; //R may still need some improvment
byte A[] = {B00011000,B00111100,B01100110,B11000011,B11111111,B11111111,B11000011,B11000011}; //A 
byte T[] = {B11111111,B11111111,B00011000,B00011000,B00011000,B00011000,B00011000,B00011000}; //T
byte I[] = {B01111110,B01111110,B00011000,B00011000,B00011000,B00011000,B01111110,B01111110}; //I
// diffine colams to match wires
#define COL_1 37
#define COL_2 36
#define COL_3 35
#define COL_4 34
#define COL_5 33
#define COL_6 32
#define COL_7 31
#define COL_8 30
 int timer1 = 1;
void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  //y
  pinMode(22, INPUT); // row 1
  pinMode(23, INPUT); // row 2
  pinMode(24, INPUT); // row 3
  pinMode(25, INPUT); // row 4
  pinMode(26, INPUT); // row 5
  pinMode(27, INPUT); // row 6
  pinMode(28, INPUT); // row 7
  pinMode(29, INPUT); // row 8

  //  pinMode(22, INPUT_PULLUP); // row 1
  // pinMode(23, INPUT_PULLUP); // row 2
  // pinMode(24, INPUT_PULLUP); // row 3
  // pinMode(25, INPUT_PULLUP); // row 4
  // pinMode(26, INPUT_PULLUP); // row 5
  // pinMode(27, INPUT_PULLUP); // row 6
  // pinMode(28, INPUT_PULLUP); // row 7
  // pinMode(29, INPUT_PULLUP); // row 8

  // pinMode(22, OUTPUT); // row 1
  // pinMode(23, OUTPUT); // row 2
  // pinMode(24, OUTPUT); // row 3
  // pinMode(25, OUTPUT); // row 4
  // pinMode(26, OUTPUT); // row 5
  // pinMode(27, OUTPUT); // row 6
  // pinMode(28, OUTPUT); // row 7
  // pinMode(29, OUTPUT); // row 8
  //x
  pinMode(30, OUTPUT); // coliam 8
  pinMode(31, OUTPUT);
  pinMode(32, OUTPUT);
  pinMode(33, OUTPUT);
  pinMode(34, OUTPUT);
  pinMode(35, OUTPUT);
  pinMode(36, OUTPUT);
  pinMode(37, OUTPUT);
  //digitalWrite(22, LOW);

  

}

void loop() {
  delay(5);
  timer1 += 1;
 

//for testing what letters look like 
 //cleardisplay();
 //displayw(I);

 // repetetly puts my name on screen 1 letter at a time
 if (timer1 < 50) {
   cleardisplay();
   displayw(H,0); //do repetedly for some time then dislay next letter
   //timer1++;
 }

   else if (timer1 < 60) {
   //cleardisplay();
  displayw(H,1);
  
 }
  else if (timer1 < 70) {
   //cleardisplay();
  displayw(H,2);
  
 }
   else if (timer1 < 80) {
   //cleardisplay();
  displayw(H,3);
  
 }



// displaying O
  else if (timer1 < 100) {
    cleardisplay();
   displayw(O,0);
   //timer1++;
  }
  else if (timer1 < 150) {
   cleardisplay();
  displayw(R,0);
  //timer1++;
 }
  else if (timer1 < 200) {
   cleardisplay();
  displayw(A,0);
  //timer1++;
 }
  else if (timer1 < 250) {
   cleardisplay();
  displayw(T,0);
  //timer1++;
 }
  else if (timer1 < 300) {
   cleardisplay();
  displayw(I,0);
  //timer1++;
 }
  else if (timer1 < 350) {
   cleardisplay();
  displayw(O,0);
  //timer1++;
 }
 else {
 timer1 = 1;
 }
 //displayw(O);


}




    
void displayw(byte buffer[],int shift) { 
   int rown = 22;
    for (byte i = 0; i < 8; i++) {

        setColumns(buffer[i],shift); // Set columns for row i
        
        digitalWrite(rown, LOW);
        delay(5); 
        digitalWrite(rown, HIGH);
        rown++ ; 
    }
    rown = 22;
}


void setColumns(byte a,int shiftoffset) {
    digitalWrite(COL_1, (a >> (0+shiftoffset)) & 0x01); // Get the 1st bit: 10000000 
    digitalWrite(COL_2, (a >> (1+shiftoffset)) & 0x01); // Get the 2nd bit: 01000000
    digitalWrite(COL_3, (a >> (2+shiftoffset)) & 0x01); // Get the 3rd bit: 00100000
    digitalWrite(COL_4, (a >> (3+shiftoffset)) & 0x01); // Get the 4th bit: 00010000
    digitalWrite(COL_5, (a >> (4+shiftoffset)) & 0x01); // Get the 5th bit: 00001000
    digitalWrite(COL_6, (a >> (5+shiftoffset)) & 0x01); // Get the 6th bit: 00000100
    digitalWrite(COL_7, (a >> (6+shiftoffset)) & 0x01); // Get the 7th bit: 00000010
    digitalWrite(COL_8, (a >> (7+shiftoffset)) & 0x01); // Get the 8th bit: 00000001
    //note using & 0x01(bitwise and) to write bits one at a time taking the least significant bit for each a restriction ie. only write the bit in position a of the byte 
    

}

void cleardisplay() {
 for (int i = 22; i < 30; i++) {
    digitalWrite(i, HIGH);
}
}