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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; version 2 of the License.
*
* 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 uint16_t ao_lcd_time = 3;
static void
ao_lcd_delay(void)
{
volatile uint16_t count;
for (count = 0; count < ao_lcd_time; count++)
;
}
static void
ao_lcd_send_ins(uint8_t ins)
{
// printf("send ins %02x\n", ins);
// ao_lcd_wait_idle();
// ao_delay(1);
ao_lcd_delay();
ao_lcd_port_put_nibble(0, ins >> 4);
ao_lcd_port_put_nibble(0, ins & 0xf);
}
void
ao_lcd_put_byte(uint8_t c)
{
// printf ("send data %02x\n", c);
// ao_lcd_wait_idle();
ao_lcd_delay();
ao_lcd_port_put_nibble(1, c >> 4);
ao_lcd_port_put_nibble(1, c & 0x0f);
}
void
ao_lcd_putstring(char *string)
{
char c;
while ((c = (uint8_t) *string++))
ao_lcd_put_byte((uint8_t) c);
}
#define AO_LCD_POWER_CONTROL 0x54
void
ao_lcd_contrast_set(uint8_t contrast)
{
ao_lcd_send_ins(AO_LCD_POWER_CONTROL | ((contrast >> 4) & 0x3));
ao_lcd_send_ins(0x70 | (contrast & 0xf));
}
void
ao_lcd_clear(void)
{
ao_lcd_send_ins(0x01);
ao_delay(1);
/* Entry mode */
ao_lcd_send_ins(0x04 | 0x02);
}
void
ao_lcd_goto(uint8_t addr)
{
ao_lcd_send_ins(0x80 | addr);
ao_lcd_send_ins(0x04 | 0x02);
}
void
ao_lcd_start(void)
{
/* get to 4bit mode */
ao_lcd_port_put_nibble(0, 0x3);
ao_lcd_port_put_nibble(0, 0x3);
ao_lcd_port_put_nibble(0, 0x3);
ao_lcd_port_put_nibble(0, 0x2);
/* function set */
ao_lcd_send_ins(0x28);
/* function set, instruction table 1 */
ao_lcd_send_ins(0x29);
/* freq set */
ao_lcd_send_ins(0x14);
/* Power/icon/contrast control*/
ao_lcd_send_ins(AO_LCD_POWER_CONTROL);
/* Follower control */
ao_lcd_send_ins(0x6d);
ao_delay(AO_MS_TO_TICKS(200));
/* contrast set */
ao_lcd_contrast_set(0x18);
/* Display on */
ao_lcd_send_ins(0x08 | 0x04);
/* Clear */
ao_lcd_clear();
}
void
ao_lcd_contrast(void)
{
ao_cmd_hex();
if (ao_cmd_status == ao_cmd_success) {
printf("setting contrast to %02x\n", ao_cmd_lex_i);
ao_lcd_contrast_set(ao_cmd_lex_i & 0x3f);
}
}
static uint8_t
ao_cmd_hex_nibble(void)
{
if ('0' <= ao_cmd_lex_c && ao_cmd_lex_c <= '9')
return ao_cmd_lex_c - '0';
if ('a' <= ao_cmd_lex_c && ao_cmd_lex_c <= 'f')
return ao_cmd_lex_c - ('a' - 10);
if ('A' <= ao_cmd_lex_c && ao_cmd_lex_c <= 'F')
return ao_cmd_lex_c - ('A' - 10);
ao_cmd_status = ao_cmd_syntax_error;
return 0;
}
void
ao_lcd_string(void)
{
uint8_t col = 0;
char c;
ao_cmd_decimal();
if (ao_cmd_status != ao_cmd_success)
return;
ao_lcd_send_ins(0x80 | (ao_cmd_lex_i ? 0x40 : 0x00));
ao_cmd_white();
while (ao_cmd_lex_c != '\n') {
c = ao_cmd_lex_c;
if (c == '\\') {
ao_cmd_lex();
c = ao_cmd_hex_nibble() << 4;
ao_cmd_lex();
c |= ao_cmd_hex_nibble();
}
ao_lcd_put_byte(c);
ao_cmd_lex();
col++;
}
while (col < 16) {
ao_lcd_put_byte(' ');
col++;
}
}
void
ao_lcd_delay_set(void)
{
ao_cmd_decimal();
if (ao_cmd_status == ao_cmd_success) {
printf("setting LCD delay to %d\n", ao_cmd_lex_i);
ao_lcd_time = ao_cmd_lex_i;
}
}
__code struct ao_cmds ao_lcd_cmds[] = {
{ ao_lcd_start, "S\0Start LCD" },
{ ao_lcd_contrast, "C <contrast>\0Set LCD contrast" },
{ ao_lcd_string, "s <line> <string>\0Send string to LCD" },
{ ao_lcd_delay_set, "t <delay>\0Set LCD delay" },
{ 0, NULL },
};
void
ao_lcd_init(void)
{
ao_lcd_port_init();
ao_cmd_register(&ao_lcd_cmds[0]);
}
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