newlib/libc/sys/sysnec810/write.c

   1 static volatile char *data = (char *)(0x20);
   2 static volatile char *control = (char *)(0x24);
   3
   4 extern void _outb (volatile char*, unsigned char);
   5 extern unsigned char _inb (volatile char*);
   6
   7 static unsigned char
   8  read_scc_reg (unsigned char n)
   9 {
  10   _outb (control, n);
  11   return _inb(control);
  12 }
  13
  14 static void write_scc_data (unsigned char n)
  15 {
  16   _outb (data, n);
  17 }
  18
  19 int
  20 _write (int dev, void *buf, unsigned int len)
  21 {
  22   int i;
  23   char *string = (char*)buf;
  24
  25   for (i = 0; i < len; i++)
  26     {
  27       int j;
  28
  29       for (j = 0 ; j < 5000; j++)
  30         ;
  31       write_scc_data (string[i]);
  32
  33     }
  34   return len;
  35 }
  36