ext.c

来自「mcf5307实验源代码」· C语言 代码 · 共 39 行

#include "ne2000.h"
#include "ne2k.h"


unsigned int PoolNumber=0;
long ticks=0x00;	/* replace with a better timeout method, like wait() */

void idle()
{
;	
}




packet_buffer *alloc_buffer(uint size)
{
   
  PoolNumber++;	
  if(size<2000)
  {
   *( (unsigned int *)(0x400000+(PoolNumber*2000)+0) )=size;                           /*set length  */
   *( (unsigned int *)(0x400000+(PoolNumber*2000)+8) )=0x400000+(PoolNumber*2000)+12;  /*set ptr     */
   return (packet_buffer *)(0x400000+(PoolNumber*2000)); 	/*to allocate the memory*/
  } 
  else
  {
  	
   return (packet_buffer *)0x00;                       /*error! */     
  }
}


void free_buffer(packet_buffer *ptr)
{
 PoolNumber--;
}