A better 4x4 Keypad Library

[underworldman]

Hello everyone,

I'm new here and i noticed that the 4x4 Keypad library for mikroC is absolutely unstable. The problem is that this library only works when you connect the keypad to PORTD as shown in the help of the mikroC compiler.

Could someone try connecting exactly as it is in the help, but this time with PORTA or PORTB?

It WON'T work!

I'm too lazy to write & debug the keypad and lcd configs in assembly, as this might take me days so i wanted someone to be of assistance with mikroC.

Regards,
Underworldman

[tihomir.losic]

Hello,

Please provide us more information:
- Which PIC you are using?
- Is there any sample code which demonstrates the problem?

I need it, in order to inspect it, and remove errors.

Thanks.

Best regards,

Losic Tihomir

[underworldman]

Hello,

Please provide us more information:
- Which PIC you are using?
- Is there any sample code which demonstrates the problem?

I need it, in order to inspect it, and remove errors.

Thanks.

Best regards,

Losic Tihomir

MCU used is: PIC16f887

CIRCUIT:



CODE:

Code: Select all

unsigned short kp, cnt, oldstate = 0;
char txt[6];

// Keypad module connections
char  keypadPort at PORTB;
// End Keypad module connections

// LCD module connections
// LCD module connections
sbit LCD_RS at RC0_bit;
sbit LCD_EN at RC1_bit;

sbit LCD_D4 at RC4_bit;
sbit LCD_D5 at RC5_bit;
sbit LCD_D6 at RC6_bit;
sbit LCD_D7 at RC7_bit;

sbit LCD_RS_Direction at TRISC0_bit;
sbit LCD_EN_Direction at TRISC1_bit;

sbit LCD_D4_Direction at TRISC4_bit;
sbit LCD_D5_Direction at TRISC5_bit;
sbit LCD_D6_Direction at TRISC6_bit;
sbit LCD_D7_Direction at TRISC7_bit;

// End LCD module connections

void main() {
  cnt = 0;                                 // Reset counter
  Keypad_Init();                           // Initialize Keypad                              
  Lcd_Init();                              // Initialize Lcd
  Lcd_Cmd(_LCD_CLEAR);                      // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);                 // Cursor off
  Lcd_Out(1, 1, "1");
  Lcd_Out(1, 1, "Key  :");                 // Write message text on Lcd
  Lcd_Out(2, 1, "Times:");

  do {
    kp = 0;                                // Reset key code variable

    // Wait for key to be pressed and released
    do
      //kp = Keypad_Key_Press();             // Store key code in kp variable
      kp = Keypad_Key_Click();             // Store key code in kp variable
    while (!kp);
   // Prepare value for output, transform key to it's ASCII value
    switch (kp) {
      //case 10: kp = 42; break;  // '*'   // Uncomment this block for keypad4x3
      //case 11: kp = 48; break;  // '0'   
      //case 12: kp = 35; break;  // '#'
      //default: kp += 48;

      case  1: kp = 49; break; // 1        // Uncomment this block for keypad4x4
      case  2: kp = 50; break; // 2
      case  3: kp = 51; break; // 3
      case  4: kp = 65; break; // A
      case  5: kp = 52; break; // 4
      case  6: kp = 53; break; // 5
      case  7: kp = 54; break; // 6
      case  8: kp = 66; break; // B        
      case  9: kp = 55; break; // 7
      case 10: kp = 56; break; // 8
      case 11: kp = 57; break; // 9
      case 12: kp = 67; break; // C
      case 13: kp = 42; break; // *
      case 14: kp = 48; break; // 0
      case 15: kp = 35; break; // #
      case 16: kp = 68; break; // D

    }

    if (kp != oldstate) {                  // Pressed key differs from previous
      cnt = 1;
      oldstate = kp;
      }
    else {                                 // Pressed key is same as previous
      cnt++;
      }

    Lcd_Chr(1, 10, kp);                    // Print key ASCII value on Lcd

    if (cnt == 255) {                      // If counter varialble overflow
      cnt = 0;
      Lcd_Out(2, 10, "   ");
      }

    WordToStr(cnt, txt);                   // Transform counter value to string
    Lcd_Out(2, 10, txt);                   // Display counter value on Lcd
  } while (1);
}

THE ABOVE CIRCUIT WITH CODE IS NOT WORKING YET I SEE NO PROBLEM WITH IT.

Regards,
underworldman

[underworldman]

Some additional Info:

I'm using ISIS 7 Professional for my simulation.

The hex file generated by mikroC compiler is used in the simulation.

When simulation is run, and a key pressed on the 4x4 keypad, no ASCII character is displyed on the LCD.

Thank you for your reply tihomir.

Please help me out :(

[tihomir.losic]

Hello,

For PIC16F887: The ANSEL register must be initialized to configure an analog channel as a digital input. Pins configured as analog inputs will read ‘0’.
http://ww1.microchip.com/downloads/en/D ... df#page=42

You need these two lines in main program:

Code: Select all

ANSEL = 0;
ANSELH = 0;

I hope it helps. If problem persists, please, create a support ticket:
http://www.mikroe.com/en/support
in order to find solution for this error.

Best regards,

Losic Tihomir

[underworldman]

Thank you very much Losic Tihomir,

It worked now :)

I'm sooo happy. Those two lines gave me headache for days...

Thanks.