|
AT24C02 C语言驱动程序—LCD1602 显示 -|zl0801 发表于 2005-8-25 9:21:00
//AT24C02 EEPROM drive program
//for 51 mcu with lcd1602 as display
//designed by zhaoliang
//2005-6-14 21:02
＃i nclude " reg51.h "
＃i nclude " intrins.h "
/********************************************************************/
//lcd part
#define LINE1 0
#define LINE2 1
#define LINE1_HEAD 0x80
#define LINE2_HEAD 0xC0
#define LCD_DELAY_TIME 40
#define DATA_MODE 0x38
#define OPEN_SCREEN 0x0C
#define DISPLAY_ADDRESS 0x80
#define CLEARSCREEN LCD_en_command(0x01)
//common part
#define HIGH 1
#define LOW 0
#define TRUE 1
#define ZERO 0
//at24c02 part
#define WRITE24C02 0xA0
#define READ24C02 0xA1
//I2C part
#define ACK 0
#define NO_ACK 1
#define MSB 0x80
/********************************************************************/
//change this part at different board
#define LCDIO P2
sbit LCD1602_RS=P0^7; //data command select 1 data 0 command pin 4
sbit LCD1602_RW=P0^6; //read write select 1 read 0 write pin 5
sbit LCD1602_EN=P0^5; //LCD enable signal pin 6
sbit SDA=P2^3; //AT24C02 serial data pin 5
sbit SCLK=P2^2; //AT24C02 serial clock pin 6
/********************************************************************/
void LCD_delay(void);//lcd delay function
void LCD_en_command(unsigned char command);//write command function
void LCD_en_dat(unsigned char temp);//write data function
void LCD_set_xy( unsigned char x, unsigned char y );//set display address function
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);//write lcd a character function
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);//write lcd string function
void LCD_init(void);//lcd initize function
/********************************************************************/
void I2C_delay(void);//I2C delay function
void I2C_start(void);//I2C start function
void I2C_stop(void);//I2C stop function
void I2C_send_ack(bit k);//I2C send responsion function
void I2C_write_byte(unsigned char dat);//I2C bus write byte function
unsigned char I2C_read_byte(void);//I2C bus read byte function
/********************************************************************/
void AT24C02_write(unsigned char address,unsigned char dat);//write 24c02 information function
unsigned char AT24C02_read(unsigned char address);//read 24c02 information function
/********************************************************************/
void Mcu_init(void);//system initize funcition
void delay_nms(unsigned int n);//delay functinon
unsigned char count[2];
/********************************************************************/
void main()
{
unsigned char temp;
Mcu_init();
while(1)
{
AT24C02_write(0x00,count[1]);
temp=AT24C02_read(0x00);
LCD_write_string(0x00,LINE1,"AT24C02 TEST");
LCD_write_char(0x0e,LINE1,(temp/10)|0x30);
LCD_write_char(0x0f,LINE1,(temp%10)|0x30);
LCD_write_string(0x00,LINE2,"TIMER0 JISHU");
LCD_write_char(0x0e,1,(count[1]/10)|0x30);
LCD_write_char(0x0f,1,(count[1]%10)|0x30);
AT24C02_write(0x00,count[1]);
}
}
/***********************************************************************/
void timer0(void) interrupt 1 using 1
{
TH0=-(12000/256);
TL0=-(12000%256);
count[0]=count[0]+1;
if(count[0]==100)
{
count[0]=0;
count[1]=count[1]+1;
if(count[1]==99)
count[1]=0;
}
}
/***********************************************************************/
void Mcu_init(void)
{
TMOD=0x11;
TH0=-(12000/256);
TL0=-(12000%256);
EA=HIGH;
ET0=HIGH;
TR0=HIGH;
LCD_init();
}
/***********************************************************************/
/******************************** I2C PART **************************/
void I2C_delay(void)
{
_nop_();_nop_();_nop_();_nop_();
}
/***********************************************************************/
void I2C_start(void)
{
SDA=HIGH;
_nop_();
SCLK=HIGH;
_nop_();
SDA=LOW;
_nop_();
SCLK=LOW;
_nop_();
}
/***********************************************************************/
void I2C_stop(void)
{
SDA=LOW;
_nop_();
SCLK=HIGH;
_nop_();
SDA=HIGH;
_nop_();
SCLK=LOW;
_nop_();
}
/***********************************************************************/
void I2C_send_ack(bit k)
{
SDA=k;
I2C_delay();
SCLK=HIGH;
I2C_delay();
SCLK=LOW;
}
/***********************************************************************/
void I2C_write_byte(unsigned char dat)
{
unsigned char i;
for (i=8;i>0;i--)
{
SCLK=LOW;
I2C_delay();
SDA=(bit)(dat&MSB);
dat<<=1;
I2C_delay();
SCLK=HIGH;
I2C_delay();
}
SCLK=LOW;
}
/***********************************************************************/
unsigned char I2C_read_byte(void)
{
unsigned char i,dat;
for (i=0;i<8;i++)
{
SCLK=LOW;
I2C_delay();
SDA=HIGH;
I2C_delay();
SCLK=HIGH;
dat<<=1;
I2C_delay();
if(SDA)
dat++;
}
SCLK=LOW;
return (dat);
}
/***********************************************************************/
/************************ 24C02 PART **********************************/
void AT24C02_write(unsigned char address,unsigned char dat)
{
unsigned char temp;
temp=dat/10;
temp<<=4;
temp=dat%10+temp;
I2C_start();
I2C_write_byte(WRITE24C02);
I2C_send_ack(ACK);
I2C_write_byte(address);
I2C_send_ack(ACK);
I2C_write_byte(temp);
I2C_send_ack(NO_ACK);
I2C_stop();
}
/***********************************************************************/
unsigned char AT24C02_read(unsigned char address)
{
unsigned char temp,dat;
I2C_start();
I2C_write_byte(WRITE24C02);
I2C_send_ack(ACK);
I2C_write_byte(address);
I2C_send_ack(NO_ACK);
I2C_stop();
I2C_start();
I2C_write_byte(READ24C02);
I2C_send_ack(ACK);
dat=I2C_read_byte();
I2C_send_ack(NO_ACK);
I2C_stop();
temp=dat/16;
dat=dat%16;
dat=dat+temp*10;
return (dat);
}
/******************** LCD PART *************************************/
void LCD_delay(void)
{
unsigned char i;
for(i=LCD_DELAY_TIME;i>ZERO;i--)//be sure lcd reset
;
}
/********************************************************************/
void LCD_en_command(unsigned char command)
{
LCDIO=command;
LCD1602_RS=LOW;
LCD1602_RW=LOW;
LCD1602_EN=LOW;
LCD_delay();
LCD1602_EN=HIGH;
}
/********************************************************************/
void LCD_en_dat(unsigned char dat)
{
LCDIO=dat;
LCD1602_RS=HIGH;
LCD1602_RW=LOW;
LCD1602_EN=LOW;
LCD_delay();
LCD1602_EN=HIGH;
}
/********************************************************************/
void LCD_set_xy( unsigned char x, unsigned char y )
{
unsigned char address;
if (y == LINE1)
address = LINE1_HEAD + x;
else
address = LINE2_HEAD + x;
LCD_en_command(address);
}
/********************************************************************/
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
LCD_set_xy( x, y );
LCD_en_dat(dat);
}
/********************************************************************/
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
LCD_set_xy( X, Y ); //set address
while (*s) // write character
{
LCDIO=*s;
LCD_en_dat(*s);
s ++;
}
}
/********************************************************************/
void LCD_init(void)
{
CLEARSCREEN;//clear screen
LCD_en_command(DATA_MODE);//set 8 bit data transmission mode
LCD_en_command(OPEN_SCREEN);//open display (enable lcd display)
LCD_en_command(DISPLAY_ADDRESS);//set lcd first display address
CLEARSCREEN;//clear screen
}
/********************************************************************/
/******************* OTHER PART ***********************************/
void delay_nms(unsigned int n)
{
unsigned int i=0,j=0;
for (i=n;i>0;i--)
for (j=0;j<1140;j++)
;
}
|
《匠人手记》推荐网上购书渠道： 
匠人学习：
