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https://github.com/Telecominfraproject/OpenCellular.git
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95462ad4fe
Signed-off-by: Randall Spangler <rspangler@chromium.org> BUG=chrome-os-partner:8724 TEST=if timestamps show up in the debug output, it works Change-Id: I5264a3a40a07a824cc15b39a7bd81f2db02a3c13
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* Copyright (c) 2012 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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/* Port 80 module for Chrome EC */
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#include "board.h"
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#include "console.h"
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#include "port80.h"
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#include "uart.h"
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#include "util.h"
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#define HISTORY_LEN 16
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static uint8_t history[HISTORY_LEN];
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static int head = 0; /* Next index to use / oldest previous entry */
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static int scroll = 0;
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void port_80_write(int data)
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{
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/* Note that this currently prints from inside the LPC interrupt
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* itself. Probably not worth the system overhead to buffer the data
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* and print it from a task, because we're printing a small amount of
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* data and uart_printf() doesn't block. */
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uart_printf("%c[%T Port 80: 0x%02x]", scroll ? '\n' : '\r', data);
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history[head] = data;
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head = (head + 1) & (HISTORY_LEN - 1);
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}
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/*****************************************************************************/
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/* Console commands */
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static int command_port80(int argc, char **argv)
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{
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int h = head;
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int i;
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/* 'port80 scroll' toggles whether port 80 output begins with a newline
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* (scrolling) or CR (non-scrolling). */
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if (argc > 1 && !strcasecmp(argv[1], "scroll")) {
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scroll = !scroll;
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uart_printf("port80 scrolling %sabled\n",
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scroll ? "en" : "dis");
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return EC_SUCCESS;
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}
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/* Technically, if a port 80 write comes in while we're
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* printing this, we could print an incorrect history.
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* Probably not worth the complexity to work around that. */
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uart_puts("Last port 80 writes:");
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for (i = 0; i < HISTORY_LEN; i++)
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uart_printf(" %02x", history[(h + i) & (HISTORY_LEN - 1)]);
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uart_puts(" <--newest\n");
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(port80, command_port80);
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/*****************************************************************************/
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/* Initialization */
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int port_80_init(void)
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{
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memset(history, 0, sizeof(history));
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return EC_SUCCESS;
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}
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