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Getting display on the LCD

 
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deligent



Joined: 30 Mar 2009
Posts: 2

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Getting display on the LCD
PostPosted: Sat Apr 11, 2009 10:17 am     Reply with quote

I have the following code it does not display the characters pressed on the keypad. Can anyone suggest the solution to display on the LCD the characters which are pressed on the keypad ?
Code:

#include <16F88.h>
#device adc=8
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOPUT, MCLR, NOBROWNOUT, NOLVP, NOCPD, NOWRT, DEBUG, NOPROTECT, NOFCMEN, NOIESO
#use fast_io(A)
#use fast_io(B)

#define RS_PIN    PIN_A4
#define E          PIN_A7
#define row0      PIN_B4
#define row1      PIN_B5
#define row2      PIN_B6
#define row3      PIN_B7
#define col0      PIN_B0
#define col1      PIN_B1
#define col2      PIN_B2
#define col3      PIN_B3
#define KBD_DEBOUNCE_FACTOR 33 // Set this number to apx n/333 where
// n is the number of times you expect
// to call kbd_getc each second

char const KEYS[4][4] =
{{'1','2','3','A'},
 {'4','5','6','B'},
 {'7','8','9','C'},
 {'*','0','#','D'}};

static char last_key;
unsigned char read_pad(void);
void SendLcdData(char data, char rs);
void SendLcdDataNibble(char data);
void InitLCD(void);

void main(){
   unsigned char key;

   setup_oscillator( OSC_8MHZ ); // This should be automatic but does not appear to work
   setup_adc_ports(NO_ANALOGS);
     setup_spi(FALSE);
     setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
     setup_timer_1(T1_DISABLED);
     setup_timer_2(T2_DISABLED,0,1);
     setup_comparator(NC_NC_NC_NC);

   set_tris_a(0x00);               // set all port A bits as outputs
   set_tris_b(0xf0);               // set port B bits 7-4 as row inputs, 3-0 outputs
   port_b_pullups(TRUE);         // turn on weak pullups on port B
   output_a(0x00);               // zero port A
   output_b(0x0f);               // set all port b outputs high
   InitLCD();                     // setup LCD
   SendLcdData(0x3f,1);            // Display '?'

   while(TRUE) {
      delay_ms(20);
      output_toggle(PIN_A6);
      last_key = read_pad();           
         SendLcdData(last_key,1);

   }  // end of while loop
} // end of main

short int ALL_ROWS (void)
{
if(input (row0) & input (row1) & input (row2) & input (row3))
   return (0);
else
   return (1);
}


unsigned char read_pad(void) {
   //signed char key=-1;

static byte kbd_call_count;
static short int kbd_down;
//static char last_key;
static byte col;

byte kchar;
byte row;

kchar='\0';

if(++kbd_call_count>KBD_DEBOUNCE_FACTOR)
  {
   switch (col)
     {
      case 0:

        output_low(col0);
        output_high(col1);
        output_high(col2);
        output_high(col3);

        break;

      case 1:
        output_high(col0);
        output_low(col1);
        output_high(col2);
        output_high(col3);
        break;

      case 2:
        output_high(col0);
        output_high(col1);
        output_low(col2);
        output_high(col3);
        break;

      case 3:
        output_high(col0);
        output_high(col1);
        output_high(col2);
        output_low(col3);
        break;
      }

   if(kbd_down)
     {
      if(!ALL_ROWS())
        {
         kbd_down=false;
         kchar=last_key;
         last_key='\0';
        }
     }
   else
     {
      if(ALL_ROWS())
        {
         if(!input (row0))
            row=0;
         else if(!input (row1))
            row=1;
         else if(!input (row2))
            row=2;
         else if(!input (row3))
            row=3;

         last_key =KEYS[row][col];
         kbd_down = true;
        }
      else
        {
         ++col;
         if(col==4)
            col=0;
        }
     }
   kbd_call_count=0;
  }
return(last_key);
}


void SendLcdData(char data, char rs)
{
   output_a(data >> 4);
   output_bit(RS_PIN,rs);
   output_bit(E,1);
   delay_cycles( 1 ); // Same as a NOP
   output_bit(E,0);
   output_a(data & 0x0f);
   output_bit(RS_PIN,rs);
   output_bit(E,1);
   delay_cycles( 1 ); // Same as a NOP
   output_bit(E,0);
   delay_us(40);
}

void SendLcdDataNibble(char data)
{
   output_a(data>>4);
   output_bit(E,1);
   delay_cycles( 1 ); // Same as a NOP
   output_bit(E,0);
   delay_us(40);

}

void LCDReset(void){
   delay_ms(50);                     // wait for LCD to power up
   SendLcdDataNibble(0x30);         // send 0x30 to LCD
   delay_ms(10);
   SendLcdDataNibble(0x30);         // send 0x30 to LCD
   delay_ms(5);
   SendLcdDataNibble(0x30);         // send 0x30 to LCD
   delay_ms(5);
}

void InitLCD(void)
{
   LCDReset();
   SendLcdDataNibble(0x20);   // setup 4 bit data
   SendLcdData(0x28,0);         // setup 4 bit data + 2 lines operation
   SendLcdData(0x06,0);         // set entry mode to incremental
   SendLcdData(0x0C,0);         // Display on, no cursor, no blink
   SendLcdData(0x01,0);         // Clear Screen
   delay_ms(2);
   SendLcdData(0x02,0);         // Cursor Home
   delay_ms(2);
}
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