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标题: 51单片机读DM9000c的ID [打印本页]

作者: 因为思念谁 时间: 2016-5-28 21:55
标题: 51单片机读DM9000c的ID
我在网上买了个DM9000c的网络通信模块，老板给了读ID的程序，可我用这个程序读不到ID，不知道是怎么回事？
代码如下：
#include<reg51.h>

sbit nRSET = P3^0;
sbit CS = P2^1;
sbit IOW = P2^2;
sbit IOR = P2^3;
sbit CMD = P2^4;

sbit LED = P2^0;

void mdelay (int m)
{
      int i;
      for (;m > 0; m--)
            for (i = 0; i < 100; i++);
}

void dm9000_write (unsigned char reg, unsigned char date)
{
      P1 = reg;
      CS = 0;
      CMD = 0;
      IOR = 1;
      IOW = 0;
      mdelay(1);
      CS = 1;
      IOW = 1;
      mdelay(2);
      P1 = date;
      CS = 0;
      CMD = 0;
      IOR = 1;
      IOW = 0;
      mdelay(1);
      CS = 1;
      IOW = 1;
}

static unsigned char dm9000_read (unsigned char reg)
{
      unsigned char date = 0;

      P1 = reg;
      CS = 0;
      CMD = 0;
      IOR = 1;
      IOW = 0;
      CS = 1;
      IOW = 1;
      P1 = 0xFF;
      CS = 0;
      CMD = 1;
      IOW = 1;
      IOR = 0;
      date = P1;
      P1 = date;
      CS = 1;
      IOR = 1;

      return date;
}

void main (void)
{
      unsigned int date = 0;

      LED = 0;
      nRSET = 0;
      mdelay(5000);
      nRSET = 1;
      mdelay(5000);
      nRSET = 0;
      mdelay(5000);
      nRSET = 1;
      mdelay(5000);
      LED = 1;
      mdelay(5000);
      date = dm9000_read (0x28);
      if (date == 0x46)
            date = dm9000_read (0x29);
      else
            while(1);
      if (date == 0x0A)
            date = dm9000_read (0x2A);
      else
            while(1);
      if (date == 0x00)
            date = dm9000_read (0x2B);
      else
            while (1);
      if (date == 0x90)
            CMD = ~CMD;
      else
            while (1);

}

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