pues esso tengo este driver si lo uso em la ralidade la lcd arranca e se queda parpadeando si lo pruebo em el proteus solo me funciona si le quito #fuses hs,NOLVP el problema es como calculo los delays para um cristal de 4mhz ya que si no pondo los fuses se supone que estaria trabajando a unos 250khz no
#include <16F628.H>
#fuses hs,NOLVP
#use standard_io ( A )
#use standard_io ( B )
#use delay ( clock = 4000000 )
#define LCD_D4 PIN_B4
#define LCD_D5 PIN_B5
#define LCD_D6 PIN_B6
#define LCD_D7 PIN_B7
#define LCD_EN PIN_B1
#define LCD_RS PIN_B2
// 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 );
// 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 )
// 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, "Test #%u", cX ); // display message
LCD_SetPosition ( LINE_2 + 5 ); // set line and offset on line
printf ( LCD_PutChar, "2nd test" ); // 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 */
{
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 );
}
