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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Port 80 module for Chrome EC */
#include "board.h"
#include "console.h"
#include "port80.h"
#include "util.h"
#define CPRINTF(format, args...) cprintf(CC_PORT80, format, ## args)
#define HISTORY_LEN 16
static uint8_t history[HISTORY_LEN];
static int head; /* Next index to use / oldest previous entry */
static int scroll;
void port_80_write(int data)
{
/* Note that this currently prints from inside the LPC interrupt
* itself. Probably not worth the system overhead to buffer the data
* and print it from a task, because we're printing a small amount of
* data and uart_printf() doesn't block. */
CPRINTF("%c[%T Port 80: 0x%02x]", scroll ? '\n' : '\r', data);
history[head] = data;
head = (head + 1) & (HISTORY_LEN - 1);
}
/*****************************************************************************/
/* Console commands */
static int command_port80(int argc, char **argv)
{
int h = head;
int i;
/* 'port80 scroll' toggles whether port 80 output begins with a newline
* (scrolling) or CR (non-scrolling). */
if (argc > 1 && !strcasecmp(argv[1], "scroll")) {
scroll = !scroll;
ccprintf("port80 scrolling %sabled\n",
scroll ? "en" : "dis");
return EC_SUCCESS;
}
/* Technically, if a port 80 write comes in while we're
* printing this, we could print an incorrect history.
* Probably not worth the complexity to work around that. */
ccputs("Last port 80 writes:");
for (i = 0; i < HISTORY_LEN; i++)
ccprintf(" %02x", history[(h + i) & (HISTORY_LEN - 1)]);
ccputs(" <--newest\n");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(port80, command_port80);
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