firmware/target/coldfire/iaudio/m5/lcd-m5.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Jens Arnold
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22
  23 #include "system.h"
  24 #include "kernel.h"
  25 #include "lcd.h"
  26
  27 /*** definitions ***/
  28
  29 /* LCD command codes */
  30 #define LCD_CNTL_POWER_CONTROL          0x25
  31 #define LCD_CNTL_VOLTAGE_SELECT         0x2b
  32 #define LCD_CNTL_LINE_INVERT_DRIVE      0x36
  33 #define LCD_CNTL_GRAY_SCALE_PATTERN     0x39
  34 #define LCD_CNTL_TEMP_GRADIENT_SELECT   0x4e
  35 #define LCD_CNTL_OSC_FREQUENCY          0x5f
  36 #define LCD_CNTL_ON_OFF                 0xae
  37 #define LCD_CNTL_OSC_ON_OFF             0xaa
  38 #define LCD_CNTL_OFF_MODE               0xbe
  39 #define LCD_CNTL_POWER_SAVE             0xa8
  40 #define LCD_CNTL_REVERSE                0xa6
  41 #define LCD_CNTL_ALL_LIGHTING           0xa4
  42 #define LCD_CNTL_COMMON_OUTPUT_STATUS   0xc4
  43 #define LCD_CNTL_COLUMN_ADDRESS_DIR     0xa0
  44 #define LCD_CNTL_NLINE_ON_OFF           0xe4
  45 #define LCD_CNTL_DISPLAY_MODE           0x66
  46 #define LCD_CNTL_DUTY_SET               0x6d
  47 #define LCD_CNTL_ELECTRONIC_VOLUME      0x81
  48 #define LCD_CNTL_DATA_INPUT_DIR         0x84
  49 #define LCD_CNTL_DISPLAY_START_LINE     0x8a
  50 #define LCD_CNTL_AREA_SCROLL            0x10
  51
  52 #define LCD_CNTL_PAGE                   0xb1
  53 #define LCD_CNTL_COLUMN                 0x13
  54 #define LCD_CNTL_DATA_WRITE             0x1d
  55
  56 /*** shared semi-private declarations ***/
  57 extern const unsigned char lcd_dibits[16] ICONST_ATTR;
  58
  59 /*** hardware configuration ***/
  60 int lcd_default_contrast(void)
  61 {
  62     return DEFAULT_CONTRAST_SETTING;
  63 }
  64
  65 void lcd_set_contrast(int val)
  66 {
  67     /* Keep val in acceptable hw range */
  68     if (val < 0)
  69         val = 0;
  70     else if (val > 127)
  71         val = 127;
  72
  73     lcd_write_command_ex(LCD_CNTL_ELECTRONIC_VOLUME, val, -1);
  74 }
  75
  76 void lcd_set_invert_display(bool yesno)
  77 {
  78     lcd_write_command(LCD_CNTL_REVERSE | (yesno?1:0));
  79 }
  80
  81 /* turn the display upside down (call lcd_update() afterwards) */
  82 void lcd_set_flip(bool yesno)
  83 {
  84     if (yesno)
  85     {
  86         lcd_write_command(LCD_CNTL_COLUMN_ADDRESS_DIR | 0);
  87         lcd_write_command(LCD_CNTL_COMMON_OUTPUT_STATUS | 1);
  88         lcd_write_command_ex(LCD_CNTL_DUTY_SET, 0x20, 2);
  89     }
  90     else
  91     {
  92         lcd_write_command(LCD_CNTL_COLUMN_ADDRESS_DIR | 1);
  93         lcd_write_command(LCD_CNTL_COMMON_OUTPUT_STATUS | 0);
  94         lcd_write_command_ex(LCD_CNTL_DUTY_SET, 0x20, 1);
  95     }
  96 }
  97
  98 void lcd_init_device(void)
  99 {
 100     /* LCD Reset */
 101     and_l(~0x00000010, &GPIO1_OUT);
 102     or_l(0x00000010, &GPIO1_ENABLE);
 103     or_l(0x00000010, &GPIO1_FUNCTION);
 104     sleep(1);
 105     or_l(0x00000010, &GPIO1_OUT);
 106     sleep(1);
 107
 108     lcd_write_command(LCD_CNTL_ON_OFF | 1); /* LCD ON */
 109     lcd_write_command(LCD_CNTL_OFF_MODE | 1); /* OFF -> VCC on drivers */
 110     lcd_write_command(LCD_CNTL_REVERSE | 0); /* Reverse OFF */
 111     lcd_write_command(LCD_CNTL_ALL_LIGHTING | 0); /* Normal */
 112     lcd_write_command(LCD_CNTL_COMMON_OUTPUT_STATUS | 0); /* Normal dir */
 113     lcd_write_command_ex(LCD_CNTL_DISPLAY_START_LINE, 4, -1);
 114     lcd_write_command(LCD_CNTL_COLUMN_ADDRESS_DIR | 1);   /* Reverse */
 115     lcd_write_command_ex(LCD_CNTL_DISPLAY_MODE, 0, -1); /* Greyscale mode */
 116     lcd_write_command_ex(LCD_CNTL_GRAY_SCALE_PATTERN, 0x53, -1);
 117     lcd_write_command_ex(LCD_CNTL_DUTY_SET, 0x20, 1);
 118     lcd_write_command_ex(LCD_CNTL_ELECTRONIC_VOLUME, 40, -1);
 119
 120     lcd_write_command(LCD_CNTL_OSC_ON_OFF | 1); /* Oscillator ON */
 121     lcd_write_command(LCD_CNTL_POWER_SAVE | 0);
 122     lcd_write_command_ex(LCD_CNTL_VOLTAGE_SELECT, 3, -1);
 123     lcd_write_command_ex(LCD_CNTL_POWER_CONTROL, 0x17, -1);
 124     lcd_write_command_ex(LCD_CNTL_OSC_FREQUENCY, 3, -1);
 125     lcd_write_command(LCD_CNTL_NLINE_ON_OFF | 1); /* N-line ON */
 126     lcd_write_command_ex(LCD_CNTL_LINE_INVERT_DRIVE, 0x10, -1);
 127     lcd_write_command_ex(LCD_CNTL_TEMP_GRADIENT_SELECT, 0, -1);
 128
 129     lcd_update();
 130 }
 131
 132 /*** update functions ***/
 133
 134 /* Performance function that works with an external buffer
 135    note that by and bheight are in 8-pixel units! */
 136 void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
 137                    int bheight, int stride)
 138 {
 139     const unsigned char *src, *src_end;
 140     unsigned char *dst_u, *dst_l;
 141     static unsigned char upper[LCD_WIDTH] IBSS_ATTR;
 142     static unsigned char lower[LCD_WIDTH] IBSS_ATTR;
 143     unsigned int byte;
 144
 145     by *= 2;
 146
 147     while (bheight--)
 148     {
 149         src = data;
 150         src_end = data + width;
 151         dst_u = upper;
 152         dst_l = lower;
 153         do
 154         {
 155             byte = *src++;
 156             *dst_u++ = lcd_dibits[byte & 0x0F];
 157             byte >>= 4;
 158             *dst_l++ = lcd_dibits[byte & 0x0F];
 159         }
 160         while (src < src_end);
 161
 162         lcd_write_command_ex(LCD_CNTL_PAGE, by++, -1);
 163         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
 164         lcd_write_command(LCD_CNTL_DATA_WRITE);
 165         lcd_write_data(upper, width);
 166
 167         lcd_write_command_ex(LCD_CNTL_PAGE, by++, -1);
 168         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
 169         lcd_write_command(LCD_CNTL_DATA_WRITE);
 170         lcd_write_data(lower, width);
 171
 172         data += stride;
 173     }
 174 }
 175
 176 /* Helper function for lcd_grey_phase_blit(). */
 177 void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
 178
 179 /* Performance function that works with an external buffer
 180    note that by and bheight are in 4-pixel units! */
 181 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
 182                          int x, int by, int width, int bheight, int stride)
 183 {
 184     stride <<= 2; /* 4 pixels per block */
 185     while (bheight--)
 186     {
 187         lcd_write_command_ex(LCD_CNTL_PAGE, by++, -1);
 188         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
 189         lcd_write_command(LCD_CNTL_DATA_WRITE);
 190         lcd_grey_data(values, phases, width);
 191         values += stride;
 192         phases += stride;
 193     }
 194 }
 195
 196 /* Update the display.
 197    This must be called after all other LCD functions that change the display. */
 198 void lcd_update(void) ICODE_ATTR;
 199 void lcd_update(void)
 200 {
 201     int y;
 202
 203     /* Copy display bitmap to hardware */
 204     for (y = 0; y < LCD_FBHEIGHT; y++)
 205     {
 206         lcd_write_command_ex(LCD_CNTL_PAGE, y, -1);
 207         lcd_write_command_ex(LCD_CNTL_COLUMN, 0, -1);
 208
 209         lcd_write_command(LCD_CNTL_DATA_WRITE);
 210         lcd_write_data (FBADDR(0, y), LCD_WIDTH);
 211     }
 212 }
 213
 214 /* Update a fraction of the display. */
 215 void lcd_update_rect(int, int, int, int) ICODE_ATTR;
 216 void lcd_update_rect(int x, int y, int width, int height)
 217 {
 218     int ymax;
 219
 220     /* The Y coordinates have to work on even 8 pixel rows */
 221     ymax = (y + height-1) >> 2;
 222     y >>= 2;
 223
 224     if(x + width > LCD_WIDTH)
 225         width = LCD_WIDTH - x;
 226     if (width <= 0)
 227         return; /* nothing left to do, 0 is harmful to lcd_write_data() */
 228     if(ymax >= LCD_FBHEIGHT)
 229         ymax = LCD_FBHEIGHT-1;
 230
 231     /* Copy specified rectange bitmap to hardware */
 232     for (; y <= ymax; y++)
 233     {
 234         lcd_write_command_ex(LCD_CNTL_PAGE, y, -1);
 235         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
 236
 237         lcd_write_command(LCD_CNTL_DATA_WRITE);
 238         lcd_write_data (FBADDR(x,y), width);
 239     }
 240 }