MSP430F169单片机请各位高手看一下我的AT24C32N的时序为什么不行

只看该作者 · 2015-11-17 11:03

#include"msp430x16x.h"
#define SDA_IN P4DIR&=~BIT0
#define SDA_OUT P4DIR|=BIT0
#define SDA_LOW P4OUT&=~BIT0
#define SDA_HIGH  P4OUT|=BIT0
#define SCL_LOW P4OUT&=~BIT1
#define SCL_HIGH  P4OUT&=~BIT1
#define LED1_ON P3OUT|=0x01 //LED1电源控制信号
#define LED2_ON P3OUT|=0x02 //LED2电源控制信号
#define LED3_ON P3OUT|=0x04 //LED3电源控制信号
#define LED_all_OFF P3OUT&=0xF8 //LED电源全部灭
const unsigned char disp_led[16]={ //7段显示笔划
0X77,0X11,0X5E,0X5B,0X39,0X6B,0X6F,0X51,0X7F,0X7B,
0X08,0X00,0X66,0X3D,0X26,0X7D};//0123456789- CHLA;
void delay_ms(unsigned char ms)
{
unsigned char t;
while(ms--)
{
for(t=0;t<5000;t++);
}
   _NOP();

}
void delay_us(unsigned char us)
{
unsigned char t;
while(us--)
{
for(t=0;t<4;t++);
}
   _NOP();
}
void start(void)
{
   SDA_OUT;
   delay_us(20);
   SDA_HIGH;
   delay_us(3);
   SCL_HIGH;
   delay_us(2);
   SDA_LOW;
   delay_us(5);
   SCL_LOW;
   delay_us(10);

}
void stop(void)
{
SDA_OUT;
SDA_LOW;
delay_us(2);
SCL_HIGH;
delay_us(2);
SDA_LOW;
delay_us(2);
SDA_HIGH;

}
void ack(void)
{
SDA_OUT;
SDA_LOW;
delay_us(2);
SCL_LOW;
delay_us(2);
SCL_HIGH;
delay_us(2);
SCL_LOW;
SDA_HIGH;
}
void noack(void)
{
SDA_OUT;
SDA_HIGH;
delay_us(2);
SCL_LOW;
delay_us(2);
SCL_HIGH;
delay_us(2);
SCL_LOW;
}
unsigned char check_ack(void)
{
unsigned char i;
SDA_IN;
SCL_HIGH;
delay_us(2);
if(P4IN&0X01)
{
   i=0;
}
else
{
   i=1;
}
SCL_LOW;
delay_us(2);
SDA_OUT;
return i;
}
void write(unsigned char data)
{
unsigned char tem;
SDA_OUT;
SCL_LOW;
for(tem=0;tem<8;tem++)
{
   if(data&0x80)
   {
      SDA_HIGH;
   }
   else
   {
      SDA_LOW;

   }

delay_us(2);
SCL_HIGH;
delay_us(2);
SCL_LOW;
delay_us(2);
data<<=1;
}
SDA_HIGH;
delay_us(15);////////////////////////需要加SDA_HIGH;

}
unsigned char read(void)
{
unsigned char tem;
unsigned char dat;
SDA_IN;
SCL_LOW;
delay_us(2);
for(tem=0;tem<8;tem++)
{
   SCL_HIGH;
   delay_us(2);
   dat<<=1;
   if(P4IN&0X01)
   {
   dat|=0x01;

   }
   else
   {
      dat&=0xfe;

   }
   SCL_LOW;



}
SDA_LOW;
   SDA_OUT;///////////////////////需要加SDA_LOW;
return dat;

}
unsigned char write_init(unsigned int addr,unsigned char data)
{
  start(); //////////////////////////
  write(0XA0);/////////////////////////
  if(check_ack==0)
  {
return 0x55;
  }
  write(0X00);//////////////////////////
  if(check_ack==0)
  {
return 0x55;
  }
write(addr);///////////////////////
if(check_ack==0)
  {
return 0x55;
  }
write(data);///////////////////////
   if(check_ack==0)
  {
return 0x55;
  }
  stop();////////////////////////////
  delay_ms(10);
  return 0;
}
unsigned char read_init(unsigned char addr)
{
  unsigned char ch;
  start();/////////////////////////////
  write(0XA0);////////////////////////
if(check_ack==0)
  {
return 0x55;
  }
//delay_ms(5);
  write(0X00);////////////////////////
  if(check_ack==0)
  {
return 0x55;
  }

  write(addr);///////////////////////位地址
if(check_ack==0)
  {
return 0x55;
  }
delay_ms(5);
////////////////////////////////////////////////////////
start();
write(0XA1);
if(check_ack==0)
  {
return 0x55;
  }
//delay_ms(5);
ch=read();
noack();
stop();
delay_us(100);
return ch;
}

void port(void)
{
      P1DIR =0x0f;
P1SEL = 0;
P1OUT = 0xff;

P2DIR=0xff;
P2SEL=0x00;
P2OUT=0x00;

P3DIR=0x17;
P3SEL=0x30;
P3OUT=0x00;

P4DIR = 0x03;
P4SEL = 0;

}
void main(void)
{
  unsigned char value=0;
  unsigned char val;
  WDTCTL = WDTPW + WDTHOLD;
port();

while(1)
  {

   LED_all_OFF;
         value++;
      write_init(10,value);
         if(value==10)
         value=0;
      delay_ms(300);
         val=read_init(10);
         LED1_ON;
      P2OUT=disp_led[val];

      delay_ms(300);
}


}