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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 writes; /* Number of port 80 writes so far */
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 cprintf() doesn't block.
*/
CPRINTF("%c[%T Port 80: 0x%02x]", scroll ? '\n' : '\r', data);
history[writes % ARRAY_SIZE(history)] = data;
writes++;
}
/*****************************************************************************/
/* Console commands */
static int command_port80(int argc, char **argv)
{
int head, tail;
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("scroll %sabled\n", scroll ? "en" : "dis");
return EC_SUCCESS;
}
/*
* Print the port 80 writes so far, clipped to the length of our
* history buffer.
*
* 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.
*/
head = writes;
if (head > ARRAY_SIZE(history))
tail = head - ARRAY_SIZE(history);
else
tail = 0;
for (i = tail; i < head; i++)
ccprintf(" %02x", history[i % ARRAY_SIZE(history)]);
ccputs(" <--new\n");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(port80, command_port80,
"[scroll]",
"Print port80 writes or toggle port80 scrolling",
NULL);
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