Hola, tengo un problema con este LCD
Estoy programando un 16F873a en CCS y no logro hacer nada
soy nuevo en estos micros y en este lenguaje, siempre programe motorola en assembler
Me gustaria q me den una mano con esto, lei este post y otros q aparecieron, modifique las librerias, cambie los delay_cycle x los delay_us y demas
no logre nada, en el LCD no se ve nada
supongo q no capte como es q se tienen q hacer estos cambios correctamente
aca les dejo los codigos:
#include <16f873a.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,PUT,BROWNOUT
#use delay(clock=4000000)
#include "flex_lcd_1.c"
void main()
{
lcd_init();
printf(lcd_putc,"hola mundo");
}
-------------------------------------------------------------------------------------------------------------------------
y este es la libreria Flex_lcd modificada, le puse el init_lcd() q mostraron mas atras
// flex_lcd.c
#define LCD_DB4 PIN_B4
#define LCD_DB5 PIN_B5
#define LCD_DB6 PIN_B6
#define LCD_DB7 PIN_B7
#define LCD_RS PIN_B1
#define LCD_RW PIN_B2
#define LCD_E PIN_B0
// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.
#define USE_LCD_RW 1
//========================================
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the 2nd line
int8 const LCD_INIT_STRING[4] =
{
0x20 | (lcd_type << 2), // Func set: 4-bit, 2 lines, 5x8 dots
0xc, // Display on
1, // Clear display
6 // Increment cursor
};
//-------------------------------------
void lcd_send_nibble(int8 nibble)
{
// Note: !! converts an integer expression
// to a boolean (1 or 0).
output_bit(LCD_DB4, !!(nibble & 1));
output_bit(LCD_DB5, !!(nibble & 2));
output_bit(LCD_DB6, !!(nibble & 4));
output_bit(LCD_DB7, !!(nibble &
);
delay_us(1); //MOD
output_high(LCD_E);
delay_us(2);// 2us MOD
output_low(LCD_E);
}
//-----------------------------------
// This sub-routine is only called by lcd_read_byte().
// It's not a stand-alone routine. For example, the
// R/W signal is set high by lcd_read_byte() before
// this routine is called.
#ifdef USE_LCD_RW
int8 lcd_read_nibble(void)
{
int8 retval;
// Create bit variables so that we can easily set
// individual bits in the retval variable.
#bit retval_0 = retval.0
#bit retval_1 = retval.1
#bit retval_2 = retval.2
#bit retval_3 = retval.3
retval = 0;
output_high(LCD_E);
delay_us(1); //MOD
retval_0 = input(LCD_DB4);
retval_1 = input(LCD_DB5);
retval_2 = input(LCD_DB6);
retval_3 = input(LCD_DB7);
output_low(LCD_E);
return(retval);
}
#endif
//---------------------------------------
// Read a byte from the LCD and return it.
#ifdef USE_LCD_RW
int8 lcd_read_byte(void)
{
int8 low;
int8 high;
output_high(LCD_RW);
delay_us(1); //MOD
high = lcd_read_nibble();
low = lcd_read_nibble();
return( (high<<4) | low);
}
#endif
//----------------------------------------
// Send a byte to the LCD.
void lcd_send_byte(int8 address, int8 n)
{
output_low(LCD_RS);
#ifdef USE_LCD_RW
while(bit_test(lcd_read_byte(),7)) ;
#else
delay_us(60);
#endif
if(address)
output_high(LCD_RS);
else
output_low(LCD_RS);
delay_us(1); //MOD
#ifdef USE_LCD_RW
output_low(LCD_RW);
delay_us(1); //MOD
#endif
output_low(LCD_E);
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}
//----------------------------
void lcd_init(void)
{
int8 i;
output_low(LCD_RS);
#ifdef USE_LCD_RW
output_low(LCD_RW);
#endif
output_low(LCD_E);
delay_ms(30);
lcd_send_nibble(0x02);
lcd_send_nibble(0x02);
lcd_send_nibble(0x0C);
delay_us(60);
lcd_send_nibble(0x00);
lcd_send_nibble(0x0C);
delay_us(60);
lcd_send_nibble(0x00);
lcd_send_nibble(0x01);
delay_ms(2);
lcd_send_nibble(0x00);
lcd_send_nibble(0x06);
}
//----------------------------
void lcd_gotoxy(int8 x, int8 y)
{
int8 address;
if(y != 1)
address = lcd_line_two;
else
address=0;
address += x-1;
lcd_send_byte(0, 0x80 | address);
}
//-----------------------------
void lcd_putc(char c)
{
switch(c)
{
case '\f':
lcd_send_byte(0,1);
delay_ms(2);//2ms
break;
case '\n':
lcd_gotoxy(1,2);
break;
case '\b':
lcd_send_byte(0,0x10);
break;
default:
lcd_send_byte(1,c);
break;
}
}
//------------------------------
#ifdef USE_LCD_RW
char lcd_getc(int8 x, int8 y)
{
char value;
lcd_gotoxy(x,y);
// Wait until busy flag is low.
while(bit_test(lcd_read_byte(),7));
output_high(LCD_RS);
value = lcd_read_byte();
output_low(lcd_RS);
return(value);
}
#endif
void lcd_setcursor(short visible, short blink) {
lcd_send_byte(0, 0xC|(visible<<1)|blink);
}
Espero q m puedan ayudar
