eeprom.c

基于MSP430的长度测量 包括16*2液晶程序

#include"EEPROM.h"
void Delay_10_uS(){
  __no_operation();  

}
void Delay_N_mS(unsigned int n)
{
  unsigned char i;
  while(n--)
  {
  i=230;
  while(i--);
  }
}

void I2C_Start(void)
{
  P5DIR|=BIT1+BIT2;
  SCL_LOW(); 
  Delay_10_uS();

  SDA_HIGHT();
  Delay_10_uS();
  SCL_HIGHT();
  Delay_10_uS();
  SDA_LOW();
  Delay_10_uS();
}
void I2C_Stop(void)
{
  P5DIR|=BIT1+BIT2;
  SCL_LOW();
  Delay_10_uS();
  Delay_10_uS();
  SDA_LOW();
  Delay_10_uS();
  SCL_HIGHT();
  Delay_10_uS();
  SDA_HIGHT();
  Delay_10_uS();
  Delay_10_uS();
}//送单字节
void send_char(char var)
{
  P5DIR|=BIT1+BIT2;
  for(unsigned char i=0;i<8;i++)
  {
    SCL_LOW();
    Delay_10_uS();  
    if((var&(0x80>>i))) SDA_HIGHT();
    else  SDA_LOW();
    SCL_HIGHT(); 
    Delay_10_uS();
    Delay_10_uS();
  }
  SCL_LOW();
  Delay_10_uS();
  Delay_10_uS();
  SDA_HIGHT();  
  SCL_HIGHT();
  Delay_10_uS();
  Delay_10_uS();
  P5DIR&=~BIT1;
  while((P5IN&0x02)==0x02);
  SCL_LOW();
}

//送多个字节
void send_string(char *data_array,char Start_address)
{
  unsigned int i=0;
  I2C_Start();
  send_char(0xa0);
  send_char(0x00);
  send_char(Start_address);
  for(i=Start_address;i<(Start_address+16);i++)
  {
    send_char(data_array[i]); //调发送单字节子程序
  }
  I2C_Stop();
}
//读单个字符
unsigned char read_char(unsigned char hilow)
{
  unsigned char i=0,var=0;
  P5DIR|=BIT2+BIT1;
  SDA_HIGHT();
  P5DIR&=~BIT1;
  for(i=0;i<8;i++)
      { 
       SCL_HIGHT();
       Delay_10_uS();
       Delay_10_uS();
       var<<=1;
       if(P5IN&BIT1)
          var|=0x01; 
       SCL_LOW();
       Delay_10_uS();
       Delay_10_uS();
      }
   P5DIR|=BIT1;
   if(hilow==1) SDA_HIGHT();
   else SDA_LOW();
   Delay_10_uS();
   SCL_HIGHT();
   Delay_10_uS();
   Delay_10_uS();
   SCL_LOW();
   Delay_10_uS();
   Delay_10_uS();
   return var;
}
//读多个字符 
void read_string(char *data_array,char Start_address)
{
  int j=0;
  I2C_Start();
  send_char(0xa0);
  send_char(0x00);
  send_char(Start_address);
  I2C_Start();
  send_char(0xa1);
  for(j=Start_address;j<(Start_address+15);j++)
  { 
       data_array[j]=read_char(0);
  }
  data_array[j]=read_char(1);
  I2C_Stop();
}
void send_pages(char *array)
{
    char addr;
    for(int i=0;i<6;i++)
    {
      addr=i<<4;
      send_string(array,addr);
      Delay_N_mS(10);
      
    }
}
void read_pages(char *array)
{
    char addr;
    for(int i=0;i<6;i++)
    {
      addr=i<<4;
      read_string(array,addr);
      Delay_N_mS(10);
    }
}