[nguyenhung1811]

chuong trinh minh viet co j sai ko ha cac ban? sao minh viet mai ma` no' chi thuc hien duoc 1 lan ghi, sau cau lenh i2c_stop() thi no' khong the doc ghi duoc nua?
-----------------------------------------------------------------------------------
#include <16f877a.h>
#include <def_16f877a.h>
#device *=16 ADC=8
#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG,

NOBROWNOUT, NOLVP, NOCPD, NOWRT
#use delay(clock=20000000)
#use I2C(master,sda=PIN_C4,scl=PIN_C3) // dung i2c =

phan cung
#include <lcd_lib_4bit.c> // Thu vien ham cho LCD

void write(int8 value, int8 add)
{
i2c_start();
i2c_write(0xD0);
i2c_write(add);
i2c_write(value);
i2c_stop();
delay_us(3);
}

int8 read(int8 add)
{
int8 value_re;
i2c_start();
i2c_write(0xD0);
i2c_write(add);
i2c_start();
i2c_write(0xD1);
value_re = i2c_read();
i2c_stop();
delay_us(3);
return(value_re);
}
void khoitao(){
i2c_start();
i2c_write(0xD0); //den dia chi

ds1307.
i2c_write(0x00); //den dia chi

thanh ghi 00H.
i2c_write(0x00); //s
i2c_write(0x00); //m
i2c_write(0x52); //h
i2c_write(0x02); //day
i2c_write(0x03); //date
i2c_write(0x04); //mth
i2c_write(0x05); //y
i2c_write(0x10); //tao xung vuong

1Hz.
i2c_stop();
delay_us(3);
}

int h,m,s,day,date,month,year,con;

void main()
{
int value;
set_tris_b(0x00);

write(0x90,0x07);// o day tao xung 1hz
delay_ms(2000); //
write(0x00,0x07);// ket thuc qua trinh tao xung. nhung mo phong thi no khong the tat chan SWQ duoc?????
}
-----------------------------------------------------------------------------
o tren, minh chi ghi duoc giu lieu duoc 1 lan, sau cau lenh i2c_stop() thi minh khong the dung cac ham write() va read() duoc, co' phai do chuong trinh dich bi loi hay sao? minh dung CCS 4.057.