interrupt implementation

interrupt_function.c

extern “C" 
{
  #include “user_interface.h"
}
#define NUM 10
#define COL 4
#define ROW 6

os_timer_t myTimer; 

const int col[COL] = {0,1,2,3};
const int row[ROW] = {4,5,12,13,14,15};

// three-dimensional array for pattern of number 0-9
int number[NUM][COL][ROW] =
{
// zero
{{1,1,1,1,1,0},
 {1,0,0,0,1,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
// one
{{0,0,0,0,0,0},
 {0,0,0,0,0,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
// two
{{1,0,1,1,1,0},
 {1,0,1,0,1,0},
 {1,1,1,0,1,0},
 {0,0,0,0,0,0}},
// three
{{1,0,1,0,1,0},
 {1,0,1,0,1,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
// four
{{1,1,1,0,0,0},
 {0,0,1,0,0,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
// five
{{1,1,1,0,1,0},
 {1,0,1,0,1,0},
 {1,0,1,1,1,0},
 {0,0,0,0,0,0}},
// six
{{1,1,1,1,1,0},
 {1,0,1,0,1,0},
 {1,0,1,1,1,0},
 {0,0,0,0,0,0}},
// seven
{{1,0,0,0,0,0},
 {1,0,0,0,0,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
// eight
{{1,1,1,1,1,0},
 {1,0,1,0,1,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}},
//nine
{{1,1,1,0,0,0},
 {1,0,1,0,0,0},
 {1,1,1,1,1,0},
 {0,0,0,0,0,0}}
};

int pixel[NUM][COL][ROW]; // the empty dimension array use in the loop
unsigned long changeNumber = 0; // the variable detected for each number

void timerCallback(void *pArg) // detect each col and row
{
  static int x=0, y; // the variable for the pixel
                     // x represent column
                     // y represent row
  if (x == 0)
  {
    digitalWrite(col[COL-1], LOW);
    digitalWrite(col[x], HIGH);
    for (y = 0; y <= 5; y++)
    {
      int light = pixel[changeNumber][x][y];
      if (light == 1)
        digitalWrite(row[y], LOW);
      else
        digitalWrite(row[y], HIGH);
    }
    x++;
  }
  else
  {
    digitalWrite(col[x-1], LOW);
    digitalWrite(col[x], HIGH);
    for (y = 0; y <= 5; y++)
    {
      int light = pixel[changeNumber][x][y];
      if (light == 1)
        digitalWrite(row[y], LOW);
      else
        digitalWrite(row[y], HIGH);
    }
    if (x == COL-1)
      x = 0;
    else
      x++;
  }
}

void user_init(void) 
{
  os_timer_setfn(&myTimer, timerCallback, NULL);
  os_timer_arm(&myTimer, 1, true);
}

void setup()
{
  Serial.begin(115200);
  int i;
  for (i=0;i<=3;i++)
  {
    pinMode(col[i], OUTPUT); // initialize pin mode as output
    digitalWrite(col[i],LOW); // initialize pin stat, anode = LOW -> off
  }
  for (i=0;i<=5;i++)
  {
    pinMode(row[i], OUTPUT); // pin mode as output
    digitalWrite(row[i],HIGH); // cathode = HIGH -> off
  }

  user_init(); //to spark the callback function
}

void loop()
{
  int i, k;
  for (i = 0; i < COL; i++) // show something in the LED board
  {
    for (k = 0; k < ROW; k++)
    {
      pixel[changeNumber][i][k] = number[changeNumber][i][k]; // let pixel work on the the number which depends “changeNumber"
    }
  }
  delay(500); // each number showing on the LED board will last for 500 millisec
  if (changeNumber == NUM-1)
    changeNumber = 0;
  else
    changeNumber++;
}