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/*
* Wi-Fi Detector opensource firmware
* LCD support
*
* Copyright (C) 2007 Michael Buesch <mb@bu3sch.de>
*
* 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.
*/
#include "lcd.h"
#include "main.h"
#include "util.h"
#include "font.h"
#include <stdint.h>
#include <string.h>
#include <avr/io.h>
/* LCD hardware definitions */
#define LCD_PORT PORTC
#define LCD_DDR DDRC
#define LCD_CLK (1 << 0) /* clock */
#define LCD_DTA (1 << 1) /* data */
#define LCD_RS (1 << 2) /* register select */
#define LCD_CS (1 << 3) /* chip select */
#define LCD_RST (1 << 4) /* reset */
#define LCD_BACKL_PORT PORTD /* Backlight */
#define LCD_BACKL_DDR DDRD
#define LCD_BACKLIGHT (1 << 4)
/* LCD commands */
#define LCD_CMD_LINE(nr) (0xB0 + (nr))
/* The LCD data buffer */
uint8_t lcd_buffer[LCD_BUFFER_SIZE];
uint16_t lcd_cursor;
static void lcd_write(uint8_t data)
{
uint8_t i = 8;
LCD_PORT |= LCD_DTA;
LCD_PORT |= LCD_CLK;
LCD_PORT &= ~LCD_CS;
do {
if (data & 0x80)
LCD_PORT |= LCD_DTA;
else
LCD_PORT &= ~LCD_DTA;
LCD_PORT &= ~LCD_CLK;
LCD_PORT |= LCD_CLK;
udelay(1);
LCD_PORT &= ~LCD_CLK;
data <<= 1;
} while (--i);
LCD_PORT |= LCD_CS;
}
static void lcd_command(uint8_t command)
{
LCD_PORT &= ~LCD_RS;
lcd_write(command);
}
static void lcd_data(uint8_t data)
{
LCD_PORT |= LCD_RS;
lcd_write(data);
}
void lcd_clear_buffer(void)
{
memset(lcd_buffer, 0, LCD_BUFFER_SIZE);
lcd_cursor = 0;
}
void lcd_commit(void)
{
uint8_t i, j;
uint8_t *d;
for (i = 0; i < 4; i++) {
lcd_command(LCD_CMD_LINE(i));
d = &lcd_buffer[i * LCD_NR_COLUMNS];
lcd_command(0x12);
lcd_command(0x04);
for (j = 0; j < LCD_NR_COLUMNS; j++)
lcd_data(d[j]);
}
}
void lcd_char_out(uint8_t c)
{
uint8_t pixel_col;
uint8_t i;
uint16_t cursor;
for (i = 0; i < LCD_PIXCOLS_PER_CHAR; i++) {
pixel_col = pgm_read_byte(&font_table[c][i]);
cursor = lcd_cursor;
lcd_buffer[cursor] = pixel_col;
if (cursor == LCD_BUFFER_SIZE - 1)
lcd_cursor = 0;
else
lcd_cursor++;
}
}
void printmem(const char *string, uint8_t length)
{
uint8_t c, i;
for (i = 0; i < length; i++) {
c = string[i];
lcd_char_out(c);
}
}
void printee(const eeprom_char *eeprom_string)
{
uint8_t c;
const eeprom_uint8_t *p = (const eeprom_uint8_t *)eeprom_string;
for ( ; ; p++) {
c = eeprom_read8(p);
if (c == '\0')
break;
lcd_char_out(c);
}
}
void print(const prog_char *flash_string)
{
uint8_t c;
for ( ; ; flash_string++) {
c = pgm_read_byte(flash_string);
if (c == '\0')
break;
lcd_char_out(c);
}
}
void printhex(uint8_t number)
{
lcd_char_out(hexdigit_to_ascii((number & 0xF0) >> 4));
lcd_char_out(hexdigit_to_ascii(number & 0x0F));
}
void printdec(uint16_t number)
{
uint8_t num[NUM16_NR_DIGITS + 1];
uint8_t i, c;
num16_to_ascii(num, number);
for (i = 0; i < ARRAY_SIZE(num); i++) {
c = num[i];
if (c == '\0')
break;
lcd_char_out(c);
}
}
void lcd_backlight_on(void)
{
/* This is called from IRQ and non-IRQ context,
* so we must make sure this is atomic. */
LCD_BACKL_PORT |= LCD_BACKLIGHT;
}
void lcd_backlight_off(void)
{
/* This is called from IRQ and non-IRQ context,
* so we must make sure this is atomic. */
LCD_BACKL_PORT &= ~LCD_BACKLIGHT;
}
void lcd_init(void)
{
LCD_BACKL_DDR |= LCD_BACKLIGHT;
lcd_backlight_off();
LCD_DDR |= LCD_CLK | LCD_DTA | LCD_RS |
LCD_CS | LCD_RST;
LCD_PORT |= (LCD_CS | LCD_CLK |
LCD_DTA | LCD_RS);
/* Reset the LCD module */
LCD_PORT &= ~LCD_RST;
mdelay(100);
LCD_PORT |= LCD_RST;
mdelay(50);
/* Initialize it */
lcd_command(0xE2);
lcd_command(0xAB);
lcd_command(0xC8);
lcd_command(0x40);
lcd_command(LCD_CMD_LINE(0));
lcd_command(0x10);
lcd_command(0x00);
lcd_command(0xA1);
lcd_command(0xA6);
lcd_command(0xA2);
lcd_command(0x2F);
lcd_command(0x24);
lcd_command(0x81);
lcd_command(0x00);
lcd_clear_buffer();
lcd_commit();
lcd_command(0xAF);
}
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