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having a problem

marauf hamash

hi every one,
i m new in keil compiler. i connect LCD16x2 and keypad (4x4). my problem is that , in LCD, it can show from 0-15 on pressing from first till last key, while i want to print what is exactly written in keypad. like 1-9, 0, A to D.?
my second problem is that i can see the number only while pressing, i want that pressed no. to show untill i press new no.?
and third problem is that,i want to save the pressed digits from key pad , to send them wirelessly too, but thats a later task, first i need to save the digits in any variables.
many thinks and regards to all, plz waiting for the reply
my code is in c:\projects\hamash\keilcpp\55

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  • 0

    In your main loop, after read a key , you should compare to an old key. If NEW key != OLD key then you have new key pressed. Otherwise, either same key pressed or no new key pressed.

    Let have a variable called OldVar1.
    Then your main loop looks something like this:

    main()
{
  var1 = INKEY();      // IS function INKEY returns 0-15

  if (var1 != OldVar1)   // CHECK THE SYNTAX FOR C
                                        // Print on LCD only have a new key pressed
  {
      Key = LOOKUP[255,1,2,3,"A",4,5,6,"B",7,8,9,"C","*",0,"#","D"][var1];
      PrintAt(2,1,var1,"grate coder");
      OldVar1 = var1   // Save the key value for later
  }
  delayms(100);

 goto main
}

I write program in hyfan-basic, but the logic is same as c

Tom

Reply
  • 0

    In your main loop, after read a key , you should compare to an old key. If NEW key != OLD key then you have new key pressed. Otherwise, either same key pressed or no new key pressed.

    Let have a variable called OldVar1.
    Then your main loop looks something like this:

    main()
{
  var1 = INKEY();      // IS function INKEY returns 0-15

  if (var1 != OldVar1)   // CHECK THE SYNTAX FOR C
                                        // Print on LCD only have a new key pressed
  {
      Key = LOOKUP[255,1,2,3,"A",4,5,6,"B",7,8,9,"C","*",0,"#","D"][var1];
      PrintAt(2,1,var1,"grate coder");
      OldVar1 = var1   // Save the key value for later
  }
  delayms(100);

 goto main
}

I write program in hyfan-basic, but the logic is same as c

Tom

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