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Chào các bác ạ, em đang muốn ghi dữ liệu vào 2 byte liên tiếp của EEPROM. Code có lấy ở trên mạng và chỉnh sửa, nhưng khổ nỗi có lỗi là khi ghi 2 byte hoặc nhiều hơn liên tiếp chỉ ghi được byte đầu tiên thôi, byte sau thì không ghi được. Đổi vị trí 2 lệnh ghi thì chỉ lệnh ghi với địa chỉ đầu là như thế nào thì vẫn ghi được, trong khi địa chỉ sau thì không thể ghi được. Các bác xem giúp em code với ạ. EM xin chân thành cảm ơn
Code:
#include <REGX51.H>
#include "string.h"
sfr lcddata=0xA0;
sbit bf=0xA7;
sbit rs=P3^0;
sbit rw=P3^1;
sbit en=P3^2;
unsigned int x=0,dat,h,l,a,b;
#define EEPROMS_ID 0xA0 /* Microchip 24xx512 */
#define SDA P1_0 /* Set P1.0 = SDA */
#define SCL P1_1 /* Set P1.1 = SCL */
#define I2C_DELAY 0x0F /* For delay i2c bus */
void I2C_delay(void)
{
unsigned char i;
for(i=0; i<I2C_DELAY; i++);
}
void I2C_clock(void)
{
I2C_delay();
SCL = 1; /* Start clock */
I2C_delay();
SCL = 0; /* Clear SCL */
}
void I2C_start(void)
{
if(SCL)
SCL = 0; /* Clear SCL */
SDA = 1; /* Set SDA */
SCL = 1; /* Set SCL */
I2C_delay();
SDA = 0; /* Clear SDA */
I2C_delay();
SCL = 0; /* Clear SCL */
}
void I2C_stop(void)
{
if(SCL)
SCL = 0; /* Clear SCL */
SDA = 0; /* Clear SDA */
I2C_delay();
SCL = 1; /* Set SCL */
I2C_delay();
SDA = 1; /* Set SDA */
}
bit I2C_write(unsigned char dat)
{
bit data_bit;
unsigned char i;
for(i=0;i<8;i++) /* For loop 8 time(send data 1 byte) */
{
data_bit = dat & 0x80; /* Filter MSB bit keep to data_bit */
SDA = data_bit; /* Send data_bit to SDA */
I2C_clock(); /* Call for send data to i2c bus */
dat = dat<<1;
}
SDA = 1; /* Set SDA */
I2C_delay();
SCL = 1; /* Set SCL */
I2C_delay();
data_bit = SDA; /* Check acknowledge */
SCL = 0; /* Clear SCL */
I2C_delay();
return data_bit; /* If send_bit = 0 i2c is valid */
}
unsigned char I2C_read(void)
{
bit rd_bit;
unsigned char i, dat;
dat = 0x00;
for(i=0;i<8;i++) /* For loop read data 1 byte */
{
I2C_delay();
SCL = 1; /* Set SCL */
I2C_delay();
rd_bit = SDA; /* Keep for check acknowledge */
dat = dat<<1;
dat = dat | rd_bit; /* Keep bit data in dat */
SCL = 0; /* Clear SCL */
}
return dat;
}
//void I2C_ack()
//{
// SDA = 0; /* Clear SDA */
// I2C_delay();
// I2C_clock(); /* Call for send data to i2c bus */
// SDA = 1; /* Set SDA */
//}
void I2C_noack()
{
SDA = 1; /* Set SDA */
I2C_delay();
I2C_clock(); /* Call for send data to i2c bus */
SCL = 1; /* Set SCL */
}
unsigned char EEPROM_get(unsigned int addr)
{
unsigned char dat;
I2C_start(); /* Start i2c bus */
I2C_write(EEPROMS_ID); /* Connect to EEPROM */
I2C_write(addr>>8); /* Request RAM address (Hight byte) */
I2C_write(addr&0x00FF); /* Request RAM address (Low byte) */
I2C_start(); /* Start i2c bus */
I2C_write(EEPROMS_ID+1);/* Connect to EEPROM for Read */
dat = I2C_read(); /* Receive data */
I2C_noack();
I2C_stop(); /* Stop i2c bus */
return dat;
}
void EEPROM_set(unsigned int addr, unsigned char val)
{
I2C_start();
I2C_write(EEPROMS_ID); /* Connect to EEPROM */
I2C_write(addr>>8); /* Request RAM address (Hight byte) */
I2C_write(addr&0x00FF); /* Request RAM address (Low byte) */
I2C_write(val); /* Write sec on RAM specified address */
I2C_stop(); /* Stop i2c bus */
}
void wait(void)
{
//long n=0;
en=1;
rs=0;
rw=1;
lcddata=0xff;
while(bf)
{
//n++;
//if(n>100)break;
}
en=0;
rw=0;
}
void lcdcontrol(unsigned char x)
{
rs=0;
rw=0;
lcddata=x;
en=1;
en=0;
wait();
}
void lcdinit(void)
{
lcdcontrol(0x30); //Phai co cai nay thi moi chay 2 dong duoc
lcdcontrol(0x38);
//lcdcontrol(0x0C);
lcdcontrol(0x0e);
lcdcontrol(0x01);
}
void lcdwrite(unsigned char c)
{
rs=1;
rw=0;
lcddata=c;
en=1;
en=0;
wait();
}
void lcdwrites(unsigned char *s)
{
unsigned char data lens, count;
lens=strlen(s);
for(count=0;count<lens;count++)
{
lcdwrite(*(s+count));
}
}
void delay(long time)
{
while(time--);
}
void number(unsigned int i)
{
unsigned char a,b,c,d,e;
e=i%10;
i=i/10;
d=i%10;
i=i/10;
c=i%10;
i=i/10;
b=i%10;
a=i/10;
lcdwrite(a+48);
lcdwrite(b+48);
lcdwrite(c+48);
lcdwrite(d+48);
lcdwrite(e+48);
}
void main(void)
{
EEPROM_set(0xffff+1,123);
EEPROM_set(0xffff,456);
IT0=1;// ngat suon âm*/
lcdinit();
lcdcontrol(0x80);
lcdwrites("Counts");
lcdcontrol(0xc0);
lcdwrites("Read");
while(1)
{
a = EEPROM_get(0xffff);
b = EEPROM_get(0xffff+1);
lcdcontrol(0xc0);
number(b);
lcdcontrol(0x87);
number(a);
}
} /* End main */
.
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