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PIC16F877A CODE LCD

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ewerebellatok

Joined: 14 Dec 2008
Posts: 1

PIC16F877A CODE LCD

Posted: Sun Dec 14, 2008 11:13 am

Hello experts,
I have problem to config this program. I used mplab to write this c code
and used CCS to compile the code. But how can I set the high speed
oscillator so that I can use external oscillator for pic16f877a. I can
simulate this code and it works fine but when I burn to PIC, lcd not display anything.

Code:

#define CRYSTAL_FREQ 16000000

#include <16F877A.h>

/* Include this file by inserting the line "#include <jonsinc.h>" at
the beginning of the C source code. Or, if you prefer, you can embed it's
contents at the end of each of your 12C509H, 16F84H, 16F874.H, etc. files.*/

#case

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

#ifndef YES
#define YES 1
#endif

#ifndef NO
#define NO 0
#endif

#ifndef HIGH
#define HIGH 1
#endif

#ifndef LOW
#define LOW 0
#endif

#ifndef ON
#define ON 1
#endif

#ifndef OFF
#define OFF 0
#endif

#ifndef UP
#define UP 1
#endif

#ifndef DOWN
#define DOWN 0
#endif

#ifndef UCHAR
#define UCHAR char
#endif

#ifndef UINT
#define UINT long
#endif

#ifndef BIT
#define BIT short
#endif

#ifndef SCHAR
#define SCHAR signed int
#endif

#ifndef SINT
#define SINT signed long
#endif

#ifndef FLOAT
#define FLOAT float
#endif

// The six bus pins are defined here.
// this example happens to use PIC port B3, B4, B5, B6 for LCD data
// and port B5 for LCD ENABLE and port B6 for LCD RS.
#define LCD_D4 PIN_B1
#define LCD_D5 PIN_B2
#define LCD_D6 PIN_B3
#define LCD_D7 PIN_B4
#define LCD_EN PIN_B5
#define LCD_RS PIN_B6

// misc display defines
#define LINE_1 0x00
#define LINE_2 0x40
#define CLEAR_DISP 0x01

// prototype statements
#separate void LCD_Init ( void );
#separate void LCD_SetPosition ( unsigned int cX );
#separate void LCD_PutChar ( unsigned int cX );
#separate void LCD_PutCmd ( unsigned int cX );
#separate void LCD_PulseEnable ( void );
#separate void LCD_SetData ( unsigned int cX );
#separate void Delay5mS ( char cCnt );

// whatever pins you assign to the display
// MUST be in a bus that is a CCS type "standard_io".
#use standard_io ( A )
#use standard_io ( B )
#use standard_io ( C )
#use delay ( clock = CRYSTAL_FREQ )
static char cButtonPressed, cSkip, cButtonCount;

// code start here
void main ( void )
{
char cX;

cX = 1; // set number
LCD_Init(); // set up LCD for 4-wire bus, etc.
LCD_PutCmd ( CLEAR_DISP ); // clear screen
LCD_SetPosition ( LINE_1 + 0 ); // set line and offset on line
printf ( LCD_PutChar, "ewere "); // display message
LCD_SetPosition ( LINE_2 + 5 ); // set line and offset on line
printf ( LCD_PutChar, "haha" ); // display message

while ( 1 ); // stop
}

/* SIX LCD-SPECIFIC FUNCTIONS ARE BELOW============================== */

#separate void LCD_Init ( void )
{
LCD_SetData ( 0x00 );
delay_ms ( 200 ); /* wait enough time after Vdd rise */
output_low ( LCD_RS );
LCD_SetData ( 0x03 ); /* init with specific nibbles to start 4-bit mode */
LCD_PulseEnable();
LCD_PulseEnable();
LCD_PulseEnable();
LCD_SetData ( 0x02 ); /* set 4-bit interface */
LCD_PulseEnable(); /* send dual nibbles hereafter, MSN first */
LCD_PutCmd ( 0x2C ); /* function set (all lines, 5x7 characters) */
LCD_PutCmd ( 0x0C ); /* display ON, cursor off, no blink */
LCD_PutCmd ( 0x01 ); /* clear display */
LCD_PutCmd ( 0x06 ); /* entry mode set, increment & scroll left */
}

#separate void LCD_SetPosition ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) | 0x08 );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
}

#separate void LCD_PutChar ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
if ( !cSkip )
{
output_high ( LCD_RS );
LCD_SetData ( swap ( cX ) ); /* send high nibble */
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) ); /* send low nibble */
LCD_PulseEnable();
output_low ( LCD_RS );
}
}

#separate void LCD_PutCmd ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) ); /* send high nibble */
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) ); /* send low nibble */
LCD_PulseEnable();
}

#separate void LCD_PulseEnable ( void )
{
output_high ( LCD_EN );
delay_us ( 3 ); // was 10
output_low ( LCD_EN );
delay_ms ( 3 ); // was 5
}

#separate void LCD_SetData ( unsigned int cX )
{
output_bit ( LCD_D4, cX & 0x01 );
output_bit ( LCD_D5, cX & 0x02 );
output_bit ( LCD_D6, cX & 0x04 );
output_bit ( LCD_D7, cX & 0x08 );
}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sun Dec 14, 2008 1:30 pm

Add #fuses and #use delay() statements. Example:

Code:

#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=16000000)

Put the statements in the order as shown above. The #include statement
is first, then the #fuses and #use delay() go after it.

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