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2c8fdd7aea
Add a common helper console_flush_stdin() to drain all pending characters from stdin. This consolidates the open-coded while (tstc()) getchar() pattern that appeared in multiple places across the tree. Signed-off-by: Gregor Herburger <gregor.herburger@linutronix.de> Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Reviewed-by: Simon Glass <sjg@chromium.org>
50 lines
947 B
C
50 lines
947 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'conitrace' command prints the codes received from the console input as
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* hexadecimal numbers.
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*
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* Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#include <command.h>
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#include <console.h>
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#include <linux/delay.h>
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static int do_conitrace(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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bool first = true;
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printf("Waiting for your input\n");
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printf("To terminate type 'x'\n");
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/* Empty input buffer */
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console_flush_stdin();
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for (;;) {
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int c = getchar();
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if (first && (c == 'x' || c == 'X'))
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break;
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printf("%02x ", c);
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first = false;
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/* 10 ms delay - serves to detect separate keystrokes */
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udelay(10000);
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if (!tstc()) {
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printf("\n");
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first = true;
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}
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}
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return CMD_RET_SUCCESS;
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}
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U_BOOT_LONGHELP(conitrace, "");
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U_BOOT_CMD_COMPLETE(
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conitrace, 2, 0, do_conitrace,
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"trace console input",
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conitrace_help_text, NULL
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);
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