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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "kernel.h"
#include "lcd.h"
#include "system.h"
/*** definitions ***/
#define LCD_SET_LOWER_COLUMN_ADDRESS ((char)0x00)
#define LCD_SET_HIGHER_COLUMN_ADDRESS ((char)0x10)
#define LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO ((char)0x20)
#define LCD_SET_POWER_CONTROL_REGISTER ((char)0x28)
#define LCD_SET_DISPLAY_START_LINE ((char)0x40)
#define LCD_SET_CONTRAST_CONTROL_REGISTER ((char)0x81)
#define LCD_SET_SEGMENT_REMAP ((char)0xA0)
#define LCD_SET_LCD_BIAS ((char)0xA2)
#define LCD_SET_ENTIRE_DISPLAY_OFF ((char)0xA4)
#define LCD_SET_ENTIRE_DISPLAY_ON ((char)0xA5)
#define LCD_SET_NORMAL_DISPLAY ((char)0xA6)
#define LCD_SET_REVERSE_DISPLAY ((char)0xA7)
#define LCD_SET_MULTIPLEX_RATIO ((char)0xA8)
#define LCD_SET_BIAS_TC_OSC ((char)0xA9)
#define LCD_SET_1OVER4_BIAS_RATIO ((char)0xAA)
#define LCD_SET_INDICATOR_OFF ((char)0xAC)
#define LCD_SET_INDICATOR_ON ((char)0xAD)
#define LCD_SET_DISPLAY_OFF ((char)0xAE)
#define LCD_SET_DISPLAY_ON ((char)0xAF)
#define LCD_SET_PAGE_ADDRESS ((char)0xB0)
#define LCD_SET_COM_OUTPUT_SCAN_DIRECTION ((char)0xC0)
#define LCD_SET_TOTAL_FRAME_PHASES ((char)0xD2)
#define LCD_SET_DISPLAY_OFFSET ((char)0xD3)
#define LCD_SET_READ_MODIFY_WRITE_MODE ((char)0xE0)
#define LCD_SOFTWARE_RESET ((char)0xE2)
#define LCD_NOP ((char)0xE3)
#define LCD_SET_END_OF_READ_MODIFY_WRITE_MODE ((char)0xEE)
/* LCD command codes */
#define LCD_CNTL_RESET 0xe2 /* Software reset */
#define LCD_CNTL_POWER 0x2f /* Power control */
#define LCD_CNTL_CONTRAST 0x81 /* Contrast */
#define LCD_CNTL_OUTSCAN 0xc8 /* Output scan direction */
#define LCD_CNTL_SEGREMAP 0xa1 /* Segment remap */
#define LCD_CNTL_DISPON 0xaf /* Display on */
#define LCD_CNTL_PAGE 0xb0 /* Page address */
#define LCD_CNTL_HIGHCOL 0x10 /* Upper column address */
#define LCD_CNTL_LOWCOL 0x00 /* Lower column address */
/*** driver routines ***/
void lcd_write_command(int cmd)
{
while ((LCDSTAT & 3) != 3);
LCDCMD = cmd;
}
void lcd_write_data( const unsigned char* data, int count )
{
int i;
for (i=0; i < count; i++) {
while ((LCDSTAT & 3) != 3);
LCDDATA = data[i];
}
}
/*** hardware configuration ***/
int lcd_default_contrast(void)
{
return 45;
}
void lcd_set_contrast(int val)
{
lcd_write_command(LCD_CNTL_CONTRAST);
lcd_write_command(val);
}
void lcd_set_invert_display(bool yesno)
{
if (yesno)
lcd_write_command(LCD_SET_REVERSE_DISPLAY);
else
lcd_write_command(LCD_SET_NORMAL_DISPLAY);
}
/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
if (yesno)
{
lcd_write_command(LCD_SET_SEGMENT_REMAP);
lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
}
else
{
lcd_write_command(LCD_SET_SEGMENT_REMAP | 0x01);
lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION | 0x08);
}
}
void lcd_init_device(void)
{
LCDREG10 = 0xf;
LCDREG04 = 0x4084;
/* inits like the original firmware */
lcd_write_command(LCD_SOFTWARE_RESET);
lcd_write_command(LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO + 4);
lcd_write_command(LCD_SET_LCD_BIAS);
lcd_write_command(LCD_SET_POWER_CONTROL_REGISTER + 7);
/* power control register: op-amp=1, regulator=1, booster=1 */
lcd_write_command(LCD_SET_DISPLAY_ON);
lcd_write_command(LCD_SET_NORMAL_DISPLAY);
lcd_set_flip(false);
lcd_write_command(LCD_SET_DISPLAY_START_LINE + 0);
lcd_set_contrast(lcd_default_contrast());
lcd_write_command(LCD_SET_PAGE_ADDRESS);
lcd_write_command(LCD_SET_LOWER_COLUMN_ADDRESS + 0);
lcd_write_command(LCD_SET_HIGHER_COLUMN_ADDRESS + 0);
lcd_clear_display();
lcd_update();
}
/*** Update functions ***/
/* Performance function that works with an external buffer
note that by and bheight are in 8-pixel units! */
void lcd_blit(const unsigned char* data, int x, int by, int width,
int bheight, int stride)
{
/* Copy display bitmap to hardware */
while (bheight--)
{
lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4)>>4) & 0xf));
lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
lcd_write_data(data, width);
data += stride;
}
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void) ICODE_ATTR;
void lcd_update(void)
{
int y;
/* Copy display bitmap to hardware */
for (y = 0; y < LCD_FBHEIGHT; y++)
{
lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
lcd_write_command (LCD_CNTL_HIGHCOL);
lcd_write_command (LCD_CNTL_LOWCOL | 4);
lcd_write_data (lcd_framebuffer[y], LCD_WIDTH);
}
}
/* Update a fraction of the display. */
void lcd_update_rect(int, int, int, int) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
{
int ymax;
/* The Y coordinates have to work on even 8 pixel rows */
ymax = (y + height-1) >> 3;
y >>= 3;
if(x + width > LCD_WIDTH)
width = LCD_WIDTH - x;
if (width <= 0)
return; /* nothing left to do, 0 is harmful to lcd_write_data() */
if(ymax >= LCD_FBHEIGHT)
ymax = LCD_FBHEIGHT-1;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)
{
lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4) >> 4) & 0xf));
lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
lcd_write_data (&lcd_framebuffer[y][x], width);
}
}
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