[转帖] ·AT24C02 C语言驱动程序—MAX7219 显示

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AT24C02 C语言驱动程序—MAX7219 显示     -|wolf0801 发表于 2005-8-25 9:19:00


//AT24C02 EEPROM drive program
//for 51 mcu with max7219 as display
//designed by zhaoliang
//2005-6-15 14:23
＃i nclude " reg51.h "
＃i nclude " intrins.h "
/********************************************************************/
//common part
#define  HIGH   1
#define  LOW    0
#define  TRUE    1
#define  ZERO    0
#define  MSB     0x80
//at24c02 part
#define  WRITE24C02    0xA0
#define     READ24C02    0xA1
//I2C part
#define  ACK    0
#define     NO_ACK    1
#define  MSB    0x80
//max7219 part
#define  DECODE_MODE     0x09
#define  INTENSITY       0x0A
#define  SCAN_LIMIT      0x0B
#define  SHUT_DOWN       0x0C
#define  DISPLAY_TEST    0x0F
/********************************************************************/
//pin defined
/***********************************************************************/
//change this part at different board
sbit LOAD=P1^2; //MAX7219    Load-Data Input:    rising edge  pin 12
sbit DIN=P1^1; //MAX7219    Serial-Data Input:   rising edge  pin 1
sbit CLK=P1^0; //MAX7219   Serial-Clock Input:  maximum 10MHz  pin 13
//function define
/***********************************************************************/
void Write_7219(unsigned char address,unsigned char dat);//write max7219 command and data
void Init_7219(void);//Initize max7219
void Write_7219_byte(unsigned char temp);//write max7219 a byte
sbit SDA=P2^3;      //AT24C02 serial data    pin 5
sbit SCLK=P2^2;     //AT24C02 serial clock    pin 6
/********************************************************************/
void Write_7219(unsigned char address,unsigned char dat);//write max7219 command and data
void Init_7219(void);//Initize max7219
void Write_7219_byte(unsigned char temp);//write max7219 a byte
/********************************************************************/
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 Display(void);//24c02 display function
unsigned char count[2];
/********************************************************************/
void main()
{
  
Mcu_init();
while(1)   
{
  Display();
}
}
/***********************************************************************/
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;
Init_7219();
}
/***********************************************************************/
/******************************** 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);
}
/***********************************************************************/
void Write_7219_byte(unsigned char temp)
{
unsigned char i;
for (i=0;i<8;i++)     
  {
   CLK=LOW;
     DIN=(bit)(temp&MSB);      
     temp<<=1;  
     CLK=HIGH;
   }
}
/***********************************************************************/
void Write_7219(unsigned char address,unsigned char dat)
{
LOAD=LOW;
   Write_7219_byte(address);
   Write_7219_byte(dat);
  LOAD=HIGH;                 
}
/***********************************************************************/
void Init_7219(void)      
{
Write_7219(SHUT_DOWN, 0x01);     //Normal Operation XXXXXXX1 Shutdown Mode   XXXXXXXX0
Write_7219(DISPLAY_TEST,0x00);     //Normal Operation XXXXXXX0 Display Test Mode XXXXXXXX1
Write_7219(DECODE_MODE, 0xfb);     //Decode Mode Select D7~D0 1 B decode 0 No decode
Write_7219(SCAN_LIMIT, 0x07);     //SCAN LIMIT 0~7 0xX0~0xX7
Write_7219(INTENSITY, 0x04);     //Set Intensity   0xX0~0xXf
}
/***********************************************************************/
void Display(void)      
{
unsigned char temp;
AT24C02_write(0x00,count[1]);
temp=AT24C02_read(0x00);
Write_7219(7,temp/10);
Write_7219(8,temp%10);
Write_7219(1,2);
Write_7219(2,4);   
Write_7219(3,0x4e);//no decode mode   'c'
Write_7219(4,0);     
Write_7219(5,2);
Write_7219(6,0x0f);  
AT24C02_write(0x00,count[1]);
}