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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"
static void
ao_lcd_port_delay(void)
{
uint8_t i;
for (i = 0; i < 100; i++)
ao_arch_nop();
}
void
ao_lcd_port_put_nibble(uint8_t rs, uint8_t nibble)
{
P0 = (P0 & 0xf0) | (nibble & 0x0f);
P1_1 = rs;
P1_0 = 1;
ao_lcd_port_delay();
P1_0 = 0;
ao_lcd_port_delay();
}
void
ao_lcd_port_init(void)
{
/* LCD_E and LCD_RS are GPIO outputs */
P1DIR |= 0x03;
P1SEL &= ~0x03;
/* LCD D4-D7 are GPIO outputs */
P0DIR |= 0x0f;
P0SEL &= ~0x0f;
}
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