/************************************************************
* up_leds.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include "up_internal.h"
/************************************************************
* Definitions
************************************************************/
#define RESET_KLUDGE_NEEDED 1
/************************************************************
* Private Data
************************************************************/
static ubyte g_ledstate;
/************************************************************
* Private Functions
************************************************************/
#if defined(CONFIG_LED_DEBUG) && defined(CONFIG_ARCH_LEDS)
static void _up_puthex(ubyte hex) __naked
{
hex; /* To avoid unreferenced argument warning */
_asm
mov a, dpl
ljmp PM2_ENTRY_PHEX
_endasm;
}
static void _up_putch(ubyte ch) __naked
{
_asm
mov a, dpl
ljmp PM2_ENTRY_COUT
_endasm;
}
static void _up_putnl(void) __naked
{
_asm
ljmp PM2_ENTRY_NEWLINE
_endasm;
}
# define _up_showledinit() \
_up_putch('I'); \
_up_puthex(g_ledstate); _up_putch(':'); \
_up_puthex(p82c55_port_e); _up_putnl();
# define _up_showledreset() \
_up_putch('R'); \
_up_puthex(led); _up_putch(':'); \
_up_puthex(g_ledstate); _up_putch(':'); \
_up_puthex(p82c55_port_e); _up_putnl();
# define _up_showledon() \
_up_putch('+'); \
_up_puthex(led); _up_putch(':'); \
_up_puthex(g_ledstate); _up_putch(':'); \
_up_puthex(p82c55_port_e); _up_putnl();
# define _up_showledoff() \
_up_putch('-'); \
_up_puthex(led); _up_putch(':'); \
_up_puthex(g_ledstate); _up_putch(':'); \
_up_puthex(p82c55_port_e); _up_putnl();
#else
# define _up_showledinit()
# define _up_showledreset()
# define _up_showledon()
# define _up_showledoff()
#endif
/************************************************************
* Public Funtions
************************************************************/
/************************************************************
* Name: up_ledinit
************************************************************/
#ifdef CONFIG_ARCH_LEDS
void up_ledinit(void)
{
/* Set all ports as outputs */
p82c55_def_config = 128;
/* Turn LED 1-7 off; turn LED 0 on */
g_ledstate = 0xfe;
p82c55_port_e = g_ledstate;
_up_showledinit();
}
/************************************************************
* Name: up_ledon
************************************************************/
void up_ledon(ubyte led)
{
/* This may be called from an interrupt handler */
irqstate_t flags = irqsave();
#ifdef RESET_KLUDGE_NEEDED
/* I don't understand why this happens yet, but sometimes
* it is necessary to reconfigure port E.
*/
if (g_ledstate != p82c55_port_e)
{
_up_showledreset();
p82c55_def_config = 128;
}
#endif
/* Clear the bit in port E corresponding to LED to turn it on */
if (led < 8)
{
g_ledstate &= ~(g_ntobit[led]);
p82c55_port_e = g_ledstate;
}
_up_showledon();
irqrestore(flags);
}
/************************************************************
* Name: up_ledoff
************************************************************/
void up_ledoff(ubyte led)
{
/* This may be called from an interrupt handler */
irqstate_t flags = irqsave();
#ifdef RESET_KLUDGE_NEEDED
/* I don't understand why this happens yet, but sometimes
* it is necessary to reconfigure port E.
*/
if (g_ledstate != p82c55_port_e)
{
_up_showledreset();
p82c55_def_config = 128;
}
#endif
/* Set the bit in port E corresponding to LED to turn it off */
if (led < 8)
{
g_ledstate |= g_ntobit[led];
p82c55_port_e = g_ledstate;
}
_up_showledoff();
irqrestore(flags);
}
#endif /* CONFIG_ARCH_LEDS */
