ex_digiserial.spc

This is an example of how to use the DigitalControl, DigitalOut, Timer0, ADChannel0, ADChannel1, SerialInCount, and SerialInByte system constants. It is also an example of how to use the printf, puts, and Wait functions.

task leds()
{
  int DigValue = 1;
  int DigCount = 8;
  int DigLen   = 7;
  int DigDir   = 0;
  DigitalControl = 0xFF;

  while(true)
  {
    DigitalOut = DigValue; // output to LEDS
    Timer0 = 10000/(ADChannel0+25);
    while(Timer0 > 0); // wait for counter to reach 0
    DigCount--;
    if (DigCount != 0)
    {
      // shifting
      if (DigDir != 0) {
        DigValue >>= 1;
      } else
        DigValue <<= 1;
      continue;
    }
    DigCount = DigLen;
    DigDir ^= 1;
    if (DigDir != 0)
    {
      // shifting
      DigValue >>= 1;
      continue;
    }

    switch(ADChannel1/128)
    {
      case 0:
        DigLen   = 7;
        DigCount = 7;
        DigValue = 0x02;
        break;
      case 1:
        DigLen   = 6;
        DigCount = 6;
        DigValue = 0x06;
        break;
      case 2:
        DigLen   = 5;
        DigCount = 5;
        DigValue = 0x0E;
        break;
      case 3:
        DigLen   = 4;
        DigCount = 4;
        DigValue = 0x1E;
        break;
      case 4:
        DigLen   = 3;
        DigCount = 3;
        DigValue = 0x3E;
        break;
      case 5:
        DigLen   = 2;
        DigCount = 2;
        DigValue = 0x7E;
        break;
      default:
        DigLen   = 1;
        DigCount = 1;
        DigValue = 0xFE;
        break;
    }

  }
}

task main()
{
  start leds;
  int b;
  while (true) {
    if (SerialInCount) {
      b = SerialInByte;
      printf("Byte %d ",b);
      if (b == 'm' || b == 'M') 
        printf("Got an m or M");
      else if (b == 'H')
        printf("Got an H");
      else if (b == 'h')
        printf("Got an h");
      printf("\r\n");
    }
    else
      puts("nothing\r\n");
    Wait(1000);
  }
}