test44x_e2prom.c

AQ430 C Code,支持LSD-TEST430F44X

#include "msp430x44x.h"

#define SCL   0X40;
#define SDA   0X80;
#define Ram_addr 0x250;

int R_word;  
int Ack_Flag;

void Delay(int m)
{
   while(m-- > 0);
}

void Start(void)
{
  P4OUT = 0;
  P4DIR &= ~SCL;
  P4DIR &= ~SDA;//SET HIGH LEVEL
  P4DIR |= SDA;
  P4DIR |= SCL;
  
}

void Stop(void)
{
  P4DIR |= SDA;
  P4DIR &= ~SCL;
  P4DIR &= ~SDA;
  P4DIR |= SCL;
}


void Send_Byte(char Byte)
{
  int i;
  for (i=0;i<8;i++)
  {
    if(Byte & 0x80)
    {
      P4DIR &= ~SDA;
    }
    else
    {
      P4DIR |= SDA; 
    }
    P4DIR &= ~SCL;
    Delay(50);
    P4DIR |= SCL;
   Byte = Byte << 1;
  } 
}

void Ack(void)
{
  P4DIR &= ~SDA; 
  P4DIR &= ~SCL;
  Ack_Flag = 0;
  Delay(10);
  if ((P4IN & 0x80))
  {
    Ack_Flag = 1;
  }
  P4DIR |= SCL;
  Delay(10);
}

void NOAck(void)
{
  P4DIR &= ~SDA;
  Delay(10);
  P4DIR &= ~SCL;
  Delay(10);
  P4DIR |= SCL;
  Delay(10);
  P4DIR |= SDA;
}

void Receive_Byte(void)
{

  int j;
  R_word = 0x00;
  P4DIR &= ~SDA;
  for(j=0;j<8;j++)
  {
    P4DIR &= ~SCL;
    if(P4IN & 0x80)
    {
      R_word |= 0x01;
    }
    else
    {
      R_word &= 0xFE;
    }
    //Delay(50);
    P4DIR |= SCL;
    R_word = R_word << 1;
   }
   R_word = R_word >>1; 
}

void I2C_Write(int W_addr,int word)
{
  
  while (1)
  {
    
    Start();
    Delay(20);
    Send_Byte(0xA0);//write a byte :slave device
    Ack();
    if (Ack_Flag)
       continue;
    Send_Byte(W_addr);// write a byte :e2prom address
    Ack();
    if(Ack_Flag)
       continue;
    
    Send_Byte(word);
    Ack();
    if(!(Ack_Flag))
       break;
  }
  Stop();
  
}

void I2C_Random_Read(int R_addr)
{
  int *paddr;
  paddr = (int*)Ram_addr;
  while(1)
  {
    Start();
    Send_Byte(0xA0);
    Ack();
    if(Ack_Flag)
      continue;
    Send_Byte(R_addr);
    Ack();
    if(Ack_Flag)
      continue;
    Start();
   Send_Byte(0xA1);
    Ack();
   if(!Ack_Flag)
     break;
 }
  Receive_Byte();
  *paddr = R_word; 
  NOAck();
  Stop();

   
}

void main(void)
{
  P4DIR = 0XFF;
  WDTCTL = WDTHOLD+WDTPW;
  while(1)

  { 
    I2C_Write(0x2A,0x10);
    Delay(500);
    I2C_Random_Read(0x2A);
   } 
  
}