103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "config.h"
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#include "console.h"
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#include "timer.h"
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#include "uart.h"
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#include "util.h"
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#include "watchdog.h"
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/*
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* Microseconds time to drain entire UART_TX console buffer at 115200 b/s, 10
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* bits per character.
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*/
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#define BUFFER_DRAIN_TIME_US (1000000UL * 10 * CONFIG_UART_TX_BUF_SIZE / 115200)
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/*
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* Generate a stream of characters on the UART console.
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*
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* The stream is an ever incrementing pattern of characters from the following
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* set: 0..9A..Za..z.
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*
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* The two optional integer command line arguments work as follows:
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*
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* argv[1] - reset the pattern after this many characters have been printed.
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* Setting this value to the width of the terminal window results
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* in a very regular stream showing on the terminal, where it is
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* easy to observe disruptions.
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* argv[2] - limit number of printed characters to this amount. If not
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* specified - keep printing indefinitely.
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*
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* Hitting 'x' on the keyboard stops the generator.
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*/
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static int command_chargen(int argc, char **argv)
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{
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int wrap_value = 0;
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int wrap_counter = 0;
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uint8_t c;
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uint32_t seq_counter = 0;
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uint32_t seq_number = 0;
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timestamp_t prev_watchdog_time;
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while (uart_getc() != -1)
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; /* Drain received characters, if any. */
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if (argc > 1)
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wrap_value = atoi(argv[1]);
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if (argc > 2)
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seq_number = atoi(argv[2]);
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c = '0';
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prev_watchdog_time = get_time();
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while (uart_getc() != 'x') {
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timestamp_t current_time;
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while (uart_buffer_full()) {
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/*
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* Let's sleep enough time to drain half of TX
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* buffer.
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*/
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usleep(BUFFER_DRAIN_TIME_US/2);
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current_time = get_time();
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if ((current_time.val - prev_watchdog_time.val) <
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(CONFIG_WATCHDOG_PERIOD_MS * 1000 / 2))
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continue;
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watchdog_reload();
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prev_watchdog_time.val = current_time.val;
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}
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uart_putc(c++);
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if (seq_number && (++seq_counter == seq_number))
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break;
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if (wrap_value && (++wrap_counter == wrap_value)) {
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c = '0';
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wrap_counter = 0;
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continue;
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}
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if (c == ('z' + 1))
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c = '0';
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else if (c == ('Z' + 1))
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c = 'a';
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else if (c == ('9' + 1))
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c = 'A';
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}
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uart_putc('\n');
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return 0;
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}
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DECLARE_SAFE_CONSOLE_COMMAND(chargen, command_chargen,
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"[seq_length [num_chars]]",
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"Generate a constant stream of characters on the "
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"UART console,\nrepeating every 'seq_length' "
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"characters, up to 'num_chars' total."
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);
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