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 <common.h>
   9 #include <command.h>
  10 #include <linux/delay.h>
  11
  12 static int do_conitrace(struct cmd_tbl *cmdtp, int flag, int argc,
  13                         char *const argv[])
  14 {
  15         bool first = true;
  16
  17         printf("Waiting for your input\n");
  18         printf("To terminate type 'x'\n");
  19
  20         /* Empty input buffer */
  21         while (tstc())
  22                 getc();
  23
  24         for (;;) {
  25                 int c = getc();
  26
  27                 if (first && (c == 'x' || c == 'X'))
  28                         break;
  29
  30                 printf("%02x ", c);
  31                 first = false;
  32
  33                 /* 1 ms delay - serves to detect separate keystrokes */
  34                 udelay(1000);
  35                 if (!tstc()) {
  36                         printf("\n");
  37                         first = true;
  38                 }
  39         }
  40
  41         return CMD_RET_SUCCESS;
  42 }
  43
  44 #ifdef CONFIG_SYS_LONGHELP
  45 static char conitrace_help_text[] = "";
  46 #endif
  47
  48 U_BOOT_CMD_COMPLETE(
  49         conitrace, 2, 0, do_conitrace,
  50         "trace console input",
  51         conitrace_help_text, NULL
  52 );