sim/erc32/examples/hello.c

   1 /* A small test program to demonstrate use of UARTs and clock */
   2
   3
   4 #define RXADATA (int *) 0x01F800E0
   5 #define RXBDATA (int *) 0x01F800E4
   6 #define RXSTAT (int *) 0x01F800E8
   7
   8 int write (fd, buf, nbyte)
   9 int fd;
  10 char *buf;
  11 int nbyte;
  12 {
  13
  14         int *rxadata;
  15         int rxmask;
  16         int nsave;
  17         volatile *rxstat;
  18
  19         nsave = nbyte;
  20
  21         switch (fd) {
  22                 case 0 :
  23                         rxadata = RXADATA;
  24                         rxmask = 6;
  25                         break;
  26                 case 1 :
  27                         rxadata = RXBDATA;
  28                         rxmask = 0x60000;
  29                         break;
  30                 default:
  31                         return (-1);
  32         }
  33         rxstat = RXSTAT;
  34         while (nbyte > 0) {
  35                 while ((*rxstat & rxmask) == 0);
  36                 *rxadata = *buf;
  37                 buf++;
  38                 nbyte--;
  39         }
  40         return (nsave);
  41 }
  42
  43 int read (fd, buf, nbyte)
  44 int fd;
  45 char *buf;
  46 int nbyte;
  47 {
  48
  49         int rxmask,*rxadata;
  50         int nsave;
  51         volatile *rxstat;
  52
  53         nsave = nbyte;
  54         switch (fd) {
  55                 case 0 :
  56                         rxadata = RXADATA;
  57                         rxmask = 1;
  58                         break;
  59                 case 1 :
  60                         rxadata = RXBDATA;
  61                         rxmask = 0x10000;
  62                         break;
  63                 default:
  64                         return (-1);
  65         }
  66         rxstat = RXSTAT;
  67         while (nbyte > 0) {
  68                 while ((*rxstat & rxmask) == 0);
  69                 *buf =  *rxadata;
  70                 buf++;
  71                 nbyte--;
  72         }
  73         return (nsave);
  74 }
  75
  76 char *
  77 puts(s)
  78 char *s;
  79 {
  80     while (*s) write(0,s++,1);
  81 }
  82
  83 main()
  84 {
  85     puts("Hello world!\n");
  86 }
  87