cmd/conitrace.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * The 'conitrace' command prints the codes received from the console input as
   4  * hexadecimal numbers.
   5  *
   6  * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
   7  */
   8 #include <command.h>
   9 #include <linux/delay.h>
  10
  11 static int do_conitrace(struct cmd_tbl *cmdtp, int flag, int argc,
  12                         char *const argv[])
  13 {
  14         bool first = true;
  15
  16         printf("Waiting for your input\n");
  17         printf("To terminate type 'x'\n");
  18
  19         /* Empty input buffer */
  20         while (tstc())
  21                 getchar();
  22
  23         for (;;) {
  24                 int c = getchar();
  25
  26                 if (first && (c == 'x' || c == 'X'))
  27                         break;
  28
  29                 printf("%02x ", c);
  30                 first = false;
  31
  32                 /* 10 ms delay - serves to detect separate keystrokes */
  33                 udelay(10000);
  34                 if (!tstc()) {
  35                         printf("\n");
  36                         first = true;
  37                 }
  38         }
  39
  40         return CMD_RET_SUCCESS;
  41 }
  42
  43 U_BOOT_LONGHELP(conitrace, "");
  44
  45 U_BOOT_CMD_COMPLETE(
  46         conitrace, 2, 0, do_conitrace,
  47         "trace console input",
  48         conitrace_help_text, NULL
  49 );