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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* 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.
*/
#include "ao.h"
#define LCD_PORT PORTB
#define LCD_DDR DDRB
#define PIN_RS 4
#define PIN_E 5
#define PIN_RW 6
static void
ao_lcd_port_set_bits(uint8_t bits)
{
#if 0
printf("\tLCD data %x RS %d R/W %d E %d\n",
bits & 0xf,
(bits & (1 << PIN_RS)) ? 1 : 0,
(bits & (1 << PIN_RW)) ? 1 : 0,
(bits & (1 << PIN_E)) ? 1 : 0);
#endif
LCD_PORT = bits;
#if 0
ao_delay(1);
if (bits & (1 << PIN_RW))
printf("\tLCD input %x\n", PINB);
#endif
}
uint8_t
ao_lcd_port_get_nibble(uint8_t rs)
{
uint8_t data = (rs ? (1 << PIN_RS) : 0) | (1 << PIN_RW);
uint8_t n;
DDRB = (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW);
ao_lcd_port_set_bits(data);
ao_lcd_port_set_bits(data | (1 << PIN_E));
n = PINB & 0xf;
ao_lcd_port_set_bits(data);
return n;
}
void
ao_lcd_port_put_nibble(uint8_t rs, uint8_t data)
{
data = (data & 0xf) | (rs ? (1 << PIN_RS) : 0);
DDRB = (0xf) | (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW);
ao_lcd_port_set_bits(data);
ao_lcd_port_set_bits(data | (1 << PIN_E));
ao_lcd_port_set_bits(data);
}
void
ao_lcd_port_init(void)
{
DDRB = (1 << PIN_RS) | (1 << PIN_E) | (1 << PIN_RW);
PORTB = 0;
}
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