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/*
* (C) Copyright 2003, Li-Pro.Net <www.li-pro.net>
* Stephan Linz <linz@li-pro.net>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* common/sevenseg.c
*
* NIOS PIO based seven segment led support functions
*/
#include <common.h>
#include <nios-io.h>
#ifdef CONFIG_SEVENSEG
#define SEVENDEG_MASK_DP ((SEVENSEG_DIGIT_DP << 8) | SEVENSEG_DIGIT_DP)
#ifdef SEVENSEG_WRONLY /* emulate read access */
#if (SEVENSEG_ACTIVE == 0)
static unsigned int sevenseg_portval = ~0;
#else
static unsigned int sevenseg_portval = 0;
#endif
#endif
static int sevenseg_init_done = 0;
static inline void __sevenseg_set_masked (unsigned int mask, int value)
{
nios_pio_t *piop __attribute__((unused)) = (nios_pio_t*)SEVENSEG_BASE;
#ifdef SEVENSEG_WRONLY /* emulate read access */
#if (SEVENSEG_ACTIVE == 0)
if (value)
sevenseg_portval &= ~mask;
else
sevenseg_portval |= mask;
#else
if (value)
sevenseg_portval |= mask;
else
sevenseg_portval &= ~mask;
#endif
piop->data = sevenseg_portval;
#else /* !SEVENSEG_WRONLY */
#if (SEVENSEG_ACTIVE == 0)
if (value)
piop->data &= ~mask;
else
piop->data |= mask;
#else
if (value)
piop->data |= mask;
else
piop->data &= ~mask;
#endif
#endif /* SEVENSEG_WRONLY */
}
static inline void __sevenseg_toggle_masked (unsigned int mask)
{
nios_pio_t *piop = (nios_pio_t*)SEVENSEG_BASE;
#ifdef SEVENSEG_WRONLY /* emulate read access */
sevenseg_portval ^= mask;
piop->data = sevenseg_portval;
#else /* !SEVENSEG_WRONLY */
piop->data ^= mask;
#endif /* SEVENSEG_WRONLY */
}
static inline void __sevenseg_set (unsigned int value)
{
nios_pio_t *piop __attribute__((unused)) = (nios_pio_t*)SEVENSEG_BASE;
#ifdef SEVENSEG_WRONLY /* emulate read access */
#if (SEVENSEG_ACTIVE == 0)
sevenseg_portval = (sevenseg_portval & SEVENDEG_MASK_DP)
| ((~value) & (~SEVENDEG_MASK_DP));
#else
sevenseg_portval = (sevenseg_portval & SEVENDEG_MASK_DP)
| (value);
#endif
piop->data = sevenseg_portval;
#else /* !SEVENSEG_WRONLY */
#if (SEVENSEG_ACTIVE == 0)
piop->data = (piop->data & SEVENDEG_MASK_DP)
| ((~value) & (~SEVENDEG_MASK_DP));
#else
piop->data = (piop->data & SEVENDEG_MASK_DP)
| (value);
#endif
#endif /* SEVENSEG_WRONLY */
}
static inline void __sevenseg_init (void)
{
nios_pio_t *piop __attribute__((unused)) = (nios_pio_t*)SEVENSEG_BASE;
__sevenseg_set(0);
#ifndef SEVENSEG_WRONLY /* setup direction */
piop->direction |= mask;
#endif /* SEVENSEG_WRONLY */
}
void sevenseg_set(int value)
{
unsigned char digits[] = {
SEVENSEG_DIGITS_0,
SEVENSEG_DIGITS_1,
SEVENSEG_DIGITS_2,
SEVENSEG_DIGITS_3,
SEVENSEG_DIGITS_4,
SEVENSEG_DIGITS_5,
SEVENSEG_DIGITS_6,
SEVENSEG_DIGITS_7,
SEVENSEG_DIGITS_8,
SEVENSEG_DIGITS_9,
SEVENSEG_DIGITS_A,
SEVENSEG_DIGITS_B,
SEVENSEG_DIGITS_C,
SEVENSEG_DIGITS_D,
SEVENSEG_DIGITS_E,
SEVENSEG_DIGITS_F
};
if (!sevenseg_init_done) {
__sevenseg_init();
sevenseg_init_done++;
}
switch (value & SEVENSEG_MASK_CTRL) {
case SEVENSEG_RAW:
__sevenseg_set( (
(digits[((value & SEVENSEG_MASK_VAL) >> 4)] << 8) |
digits[((value & SEVENSEG_MASK_VAL) & 0xf)] ) );
return;
break; /* paranoia */
case SEVENSEG_OFF:
__sevenseg_set(0);
__sevenseg_set_masked(SEVENDEG_MASK_DP, 0);
return;
break; /* paranoia */
case SEVENSEG_SET_DPL:
__sevenseg_set_masked(SEVENSEG_DIGIT_DP, 1);
return;
break; /* paranoia */
case SEVENSEG_SET_DPH:
__sevenseg_set_masked((SEVENSEG_DIGIT_DP << 8), 1);
return;
break; /* paranoia */
case SEVENSEG_RES_DPL:
__sevenseg_set_masked(SEVENSEG_DIGIT_DP, 0);
return;
break; /* paranoia */
case SEVENSEG_RES_DPH:
__sevenseg_set_masked((SEVENSEG_DIGIT_DP << 8), 0);
return;
break; /* paranoia */
case SEVENSEG_TOG_DPL:
__sevenseg_toggle_masked(SEVENSEG_DIGIT_DP);
return;
break; /* paranoia */
case SEVENSEG_TOG_DPH:
__sevenseg_toggle_masked((SEVENSEG_DIGIT_DP << 8));
return;
break; /* paranoia */
case SEVENSEG_LO:
case SEVENSEG_HI:
case SEVENSEG_STR:
default:
break;
}
}
#endif /* CONFIG_SEVENSEG */
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