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Mình mới tập viết code cho pic được 1 tuần, hiện đang thử viết một số code đơn giản. nhưng những thư viện mình dùng khi build thì toàn thông báo lỗi thế này:

The target "C:\Users\Luong\Documents\VXL\main.o" is already up to date.
Executing: "C:\Program files\Picc\CCSC.exe" +FM "lcd_lib_4bit.c" +EXPORT  #__DEBUG=1 +ICD +DF +LN +T +A +M +Z +Y=9 +EA #__16F877A=TRUE
*** Error 128 "lcd_lib_4bit.c" Line 18(2,10): A #DEVICE required before this line
C:\Users\Luong\Documents\VXL\lcd_lib_4bit.o ===>  1 Errors,  0 Warnings.

Khó hiếu nhất là cái thông baó: A #DEVICE required before this line. Khi chỉ vào nó nhỉ vào cái dòng #separate ấy

File lcd_lib_4bit.c

/*
Driver Lcd 16x2 che do 4 bit

*/
#include <stddef.h>
#define LCD_RS PIN_B2
#define LCD_EN PIN_B3
#define LCD_D4 PIN_B4
#define LCD_D5 PIN_B5
#define LCD_D6 PIN_B6
#define LCD_D7 PIN_B7
// misc display defines-
#define LINE_1 0x80
#define LINE_2 0xC0
#define CLR_SCR 0x01 // Ma xoa man hinh
#use delay(clock=20000000)
// prototype statements
#separate void lcd_init (void);                              // ham khoi tao LCD
#separate void lcd_position ( unsigned int x );              //Thiet lap vi tri con tro
#separate void lcd_gotoxy(char x, char y);                   // Lap vi tri con tro theo toa do hang x cot y
#separate void lcd_putchar ( unsigned int _ch );			 // Ham viet 1 ky tu/1 chuoi len LCD
#separate void lcd_cmd ( unsigned int _cmd); 				 // Ham gui lenh len LCD
#separate void lcd_send_data ( unsigned int _cmd ); 		 // Ham gui data
#separate void lcd_pulse ( void );							 // Xung kich hoat
#separate void lcd_setdata ( unsigned int _data );    		 // Ham xac dinh gui 4 bit
#separate void lcd_bcd(int8 y);								 // Ham in ma bcd

//khoi tao LCD**********************************************
#separate void lcd_init (void)
{
lcd_setdata (0x00);
delay_ms(200); /* wait enough time after Vdd rise >> 15ms */
output_low (LCD_RS);// che do gui lenh
lcd_setdata (0x03);
lcd_pulse();
lcd_pulse();
lcd_pulse(); 
lcd_setdata (0x02); //* set 4-bit interface */
lcd_cmd (0x28); /* send dual nibbles hereafter, MSN first */
lcd_cmd ( 0x2C ); /* function set (all lines, 5x7 characters) */
lcd_cmd ( 0x0C ); /* display ON, cursor off, no blink */
lcd_cmd ( 0x06 ); /* entry mode set, increment & scroll left */
lcd_cmd ( 0x01 ); /* clear display */
}
#separate void lcd_position ( unsigned int y ) 
{
if(y>0) y=y-1;
else y=1;
output_low(LCD_EN);
output_low(LCD_RS);
if (y<=15){
lcd_setdata (y|0x80); 
lcd_pulse();
lcd_setdata (swap(y)); // Dao vi tri bien x=0xab ve 0xba, gui di 4 bit thap
lcd_pulse();
}
if(y>15){
lcd_setdata (y|0xC0); // Dao nguoc vi tri bien x=0xab thanh 0xba, gui di 4 bit cao.
lcd_pulse();
lcd_setdata (swap(y)); // Tiep tuc dao vi tri bien x=0xba ve 0xab, gui di 4 bit thap
lcd_pulse();
}
}
#separate void lcd_gotoxy(char x, char y)
{
char address;
switch(x) {
case 1 : address=0x80;break;
case 2 : address=0xc0;break;
case 3 : address=0x94;break;
case 4 : address=0xd4;break;
}
address=address+(y-1);
lcd_cmd(0x80|address);
}

#separate void lcd_putc ( unsigned int _ch )
{
/* this subroutine works specifically for 4-bit Port A */
output_low(LCD_EN);
output_high(LCD_RS);
lcd_send_data(_ch);
output_low(LCD_RS);
}
#separate void lcd_cmd ( unsigned int _cmd )
{
output_low(LCD_RS); /* this subroutine works specifically for 4-bit Port A */
output_low(LCD_EN);
lcd_setdata (swap(_cmd)); /* gui 4 bit cao */
lcd_pulse();
lcd_setdata (swap(_cmd)); /* gui 4 bit thap */
lcd_pulse();
}
#separate void lcd_send_data ( unsigned int _cmd )
{
 /* this subroutine works specifically for 4-bit Port A */
lcd_setdata (swap(_cmd)); /* gui 4 bit cao */
lcd_pulse();
lcd_setdata (swap(_cmd)); /* gui 4 bit thap */
lcd_pulse();
}
#separate void lcd_pulse (void)
{
output_high(LCD_EN);
delay_us(10); // was 10
output_low(LCD_EN);
delay_ms(10); // was 5
}
#separate void lcd_setdata ( unsigned int _data ) // Ham gui data
{
output_bit ( LCD_D4, _data & 0x01 ); // Gui di bit cao D4-D7
output_bit ( LCD_D5, _data & 0x02 );
output_bit ( LCD_D6, _data & 0x04 );
output_bit ( LCD_D7, _data & 0x08 );
}
#separate void lcd_bcd(int8 y) // ham in ma bcd
{
lcd_putc(y+0x30);
}

Cái file lcd_lib_4bit gốc vốn ko có dòng "#use delay(clock=20000000)", nhưng ko chạy dc delay_us và delay_ms nên lại thêm vào.

File main.c

#include <16F877A.h>
#include "lcd_lib_4bit.c"
#include "ds1307.c"

#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz)
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection

#use delay(clock=20000000)
#use i2c(Master,Fast,sda=PIN_C4,scl=PIN_C3)

#define EN PIN_B3
#define RS PIN_B2
#define D4 PIN_B4
#define D5 PIN_B5
#define D6 PIN_B6
#define D7 PIN_B7

#define SET PIN_C0 // Nut menu-set
#define UP PIN_C1 // Nut tang
#define DOWN PIN_C2 // Nut giam
#define MODE PIN_C6
#define ZERO PIN_C7
#define SPEAKER PIN_B0

//#int_lcd

//========================= Khai bao bien ===============================
int secon,minute,hour,date,wday,month,year;
int sech,secl,minh,minl,hrh,hrl,dayh,dayl,monh,monl,yrh,yrl;

//=========================== Khai bao ham ==========================
void ds1307_read();
void display_hr();
unsigned char bcd2upperchr(unsigned char bcd);
unsigned char bcd2lowerchr(unsigned char bcd);
//========================== Ham Main ================================

void main()
{  delay_ms(100);
   lcd_init();
   lcd_cmd(0x01);
   delay_ms(10);
   while(TRUE)
   {
      	ds1307_read();
      	display_hr();
		delay_ms(50);
   }

}

//************************************ Dinh nghia ham **********************************************

//================== Ham doc lay thong tin tu ds1307 =====================
void ds1307_read()
{
secon=read_ds1307(0);
minute=read_ds1307(1);
hour=read_ds1307(2);
wday=read_ds1307(3);
date=read_ds1307(4);
month=read_ds1307(5);
year=read_ds1307(6);
sech=bcd2upperchr(secon);
secl=bcd2lowerchr(secon);
minh=bcd2upperchr(minute);
minl=bcd2lowerchr(minute);
hrh=bcd2upperchr(hour);
hrl=bcd2lowerchr(hour);
dayh=bcd2upperchr(date);
dayl=bcd2lowerchr(date);
monh=bcd2upperchr(month);
monl=bcd2lowerchr(month);
yrh=bcd2upperchr(year);
yrl=bcd2lowerchr(year);
}

//==================== Ham hien thi ======================
void display_hr()
{
lcd_gotoxy(1,2);
switch (wday){
   case 2: {printf(lcd_putc,"Mon ");}
   break;
   case 3: {printf(lcd_putc,"Tue ");}
   break;
   case 4: {printf(lcd_putc,"Wed ");}
   break;
   case 5: {printf(lcd_putc,"Thu ");}
   break;
   case 6: {printf(lcd_putc,"Fri ");}
   break;
   case 7: {printf(lcd_putc,"Sat ");}
   break;
   case 1: {printf(lcd_putc,"Sun ");}
   break;
}
printf(lcd_bcd,"%u%u/%u%u/20%u%u",dayh,dayl,monh,monl,yrh,yrl);
lcd_gotoxy(5,2);
printf(lcd_bcd,"%u%u:%u%u:%u%u",hrh,hrl,minh,minl,sech,secl);
}

//================== Ham tach bit cao thap ======================
unsigned char bcd2upperchr(unsigned char bcd)
{
return ((bcd >> 4) + '0');
}

unsigned char bcd2lowerchr(unsigned char bcd)
{
return ((bcd & 0x0F) + '0');
}

File ds1307.c

#define RTC_SDA PIN_C4
#define RTC_SCL PIN_C3
#use i2c(master, sda=RTC_SDA, scl=RTC_SCL)

BYTE bin2bcd(BYTE datain);
BYTE bcd2bin(BYTE datain);

//==========================
void init_ds1307()
{
output_float(RTC_SCL);
output_float(RTC_SDA);
}

//==========================

BYTE bin2bcd(BYTE datain) //Convert data to BCD
{
   int nibh;
   int nibl;

   nibh=datain/10;
   nibl=datain-(nibh*10);

   return((nibh<<4)|nibl);
}
BYTE bcd2bin(BYTE datain) //Convert data to int
{
   int i;
   i=datain;
   datain=(i>>4)*10;
   datain=datain+(i<<4>>4);
   return datain;
}

//=================== Ghi 1 byte vao ds1307 ========================
void write_ds1307(byte address, BYTE data)
{
short int status;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_write(data);
i2c_stop();
i2c_start();
status=i2c_write(0xd0);
while(status==1)
{
i2c_start();
status=i2c_write(0xd0);
}
}

//========== Doc 1 byte tu ds1307 ================
BYTE read_ds1307(byte address)
{
BYTE data;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_start();
i2c_write(0xd1);
data=i2c_read(0);
i2c_stop();
return(data);
}

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