firmware/scroll_engine.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Michael Sevakis
  11  *
  12  * LCD scrolling driver and scheduler
  13  *
  14  * Much collected and combined from the various Rockbox LCD drivers.
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * as published by the Free Software Foundation; either version 2
  19  * of the License, or (at your option) any later version.
  20  *
  21  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  22  * KIND, either express or implied.
  23  *
  24  ****************************************************************************/
  25 #include "config.h"
  26 #include "gcc_extensions.h"
  27 #include "cpu.h"
  28 #include "kernel.h"
  29 #include "thread.h"
  30 #include "usb.h"
  31 #include "lcd.h"
  32 #include "font.h"
  33 #ifdef HAVE_REMOTE_LCD
  34 #include "lcd-remote.h"
  35 #endif
  36 #include "scroll_engine.h"
  37
  38 static const char scroll_tick_table[18] = {
  39  /* Hz values [f(x)=100.8/(x+.048)]:
  40     1, 1.25, 1.55, 2, 2.5, 3.12, 4, 5, 6.25, 8.33, 10, 12.5, 16.7, 20, 25, 33, 49.2, 96.2 */
  41     100, 80, 64, 50, 40, 32, 25, 20, 16, 12, 10, 8, 6, 5, 4, 3, 2, 1
  42 };
  43
  44 static void scroll_thread(void);
  45 static char scroll_stack[DEFAULT_STACK_SIZE*3];
  46 static const char scroll_name[] = "scroll";
  47
  48 static struct scrollinfo lcd_scroll[LCD_SCROLLABLE_LINES];
  49
  50 #ifdef HAVE_REMOTE_LCD
  51 static struct scrollinfo lcd_remote_scroll[LCD_REMOTE_SCROLLABLE_LINES];
  52 static struct event_queue scroll_queue SHAREDBSS_ATTR;
  53 #endif
  54
  55 struct scroll_screen_info lcd_scroll_info =
  56 {
  57     .scroll       = lcd_scroll,
  58     .lines        = 0,
  59     .ticks        = 12,
  60     .delay        = HZ/2,
  61     .bidir_limit  = 50,
  62 #ifdef HAVE_LCD_BITMAP
  63     .step         = 6,
  64 #endif
  65 #ifdef HAVE_LCD_CHARCELLS
  66     .jump_scroll_delay = HZ/4,
  67     .jump_scroll       = 0,
  68 #endif
  69 };
  70
  71 #ifdef HAVE_REMOTE_LCD
  72 struct scroll_screen_info lcd_remote_scroll_info =
  73 {
  74     .scroll       = lcd_remote_scroll,
  75     .lines        = 0,
  76     .ticks        = 12,
  77     .delay        = HZ/2,
  78     .bidir_limit  = 50,
  79     .step         = 6,
  80 };
  81 #endif /* HAVE_REMOTE_LCD */
  82
  83 void lcd_stop_scroll(void)
  84 {
  85     lcd_scroll_info.lines = 0;
  86 }
  87
  88 /* Stop scrolling line y in the specified viewport, or all lines if y < 0 */
  89 void lcd_scroll_stop_line(const struct viewport* current_vp, int y)
  90 {
  91     int i = 0;
  92
  93     while (i < lcd_scroll_info.lines)
  94     {
  95         if ((lcd_scroll_info.scroll[i].vp == current_vp) &&
  96             ((y < 0) || (lcd_scroll_info.scroll[i].y == y)))
  97         {
  98             /* If i is not the last active line in the array, then move
  99                the last item to position i */
 100             if ((i + 1) != lcd_scroll_info.lines)
 101             {
 102                 lcd_scroll_info.scroll[i] =
 103                     lcd_scroll_info.scroll[lcd_scroll_info.lines-1];
 104             }
 105             lcd_scroll_info.lines--;
 106
 107             /* A line can only appear once, so we're done,
 108              * unless we are clearing the whole viewport */
 109             if (y >= 0)
 110                 return ;
 111         }
 112         else
 113         {
 114             i++;
 115         }
 116     }
 117 }
 118
 119 /* Stop all scrolling lines in the specified viewport */
 120 void lcd_scroll_stop(const struct viewport* vp)
 121 {
 122     lcd_scroll_stop_line(vp, -1);
 123 }
 124
 125 void lcd_scroll_speed(int speed)
 126 {
 127     lcd_scroll_info.ticks = scroll_tick_table[speed];
 128 }
 129
 130 #if defined(HAVE_LCD_BITMAP)
 131 void lcd_scroll_step(int step)
 132 {
 133     lcd_scroll_info.step = step;
 134 }
 135 #endif
 136
 137 void lcd_scroll_delay(int ms)
 138 {
 139     lcd_scroll_info.delay = ms / (HZ / 10);
 140 }
 141
 142 void lcd_bidir_scroll(int percent)
 143 {
 144     lcd_scroll_info.bidir_limit = percent;
 145 }
 146
 147 #ifdef HAVE_LCD_CHARCELLS
 148 void lcd_jump_scroll(int mode) /* 0=off, 1=once, ..., JUMP_SCROLL_ALWAYS */
 149 {
 150     lcd_scroll_info.jump_scroll = mode;
 151 }
 152
 153 void lcd_jump_scroll_delay(int ms)
 154 {
 155     lcd_scroll_info.jump_scroll_delay = ms / (HZ / 10);
 156 }
 157 #endif
 158
 159 #ifdef HAVE_REMOTE_LCD
 160 void lcd_remote_stop_scroll(void)
 161 {
 162     lcd_remote_scroll_info.lines = 0;
 163 }
 164
 165 /* Stop scrolling line y in the specified viewport, or all lines if y < 0 */
 166 void lcd_remote_scroll_stop_line(const struct viewport* current_vp, int y)
 167 {
 168     int i = 0;
 169
 170     while (i < lcd_remote_scroll_info.lines)
 171     {
 172         if ((lcd_remote_scroll_info.scroll[i].vp == current_vp) &&
 173             ((y < 0) || (lcd_remote_scroll_info.scroll[i].y == y)))
 174         {
 175             /* If i is not the last active line in the array, then move
 176                the last item to position i */
 177             if ((i + 1) != lcd_remote_scroll_info.lines)
 178             {
 179                 lcd_remote_scroll_info.scroll[i] =
 180                     lcd_remote_scroll_info.scroll[lcd_remote_scroll_info.lines-1];
 181             }
 182             lcd_remote_scroll_info.lines--;
 183
 184             /* A line can only appear once, so we're done,
 185              * unless we are clearing the whole viewport */
 186             if (y >= 0)
 187                 return ;
 188         }
 189         else
 190         {
 191             i++;
 192         }
 193     }
 194 }
 195
 196 /* Stop all scrolling lines in the specified viewport */
 197 void lcd_remote_scroll_stop(const struct viewport* vp)
 198 {
 199     lcd_remote_scroll_stop_line(vp, -1);
 200 }
 201
 202 void lcd_remote_scroll_speed(int speed)
 203 {
 204     lcd_remote_scroll_info.ticks = scroll_tick_table[speed];
 205 }
 206
 207 void lcd_remote_scroll_step(int step)
 208 {
 209     lcd_remote_scroll_info.step = step;
 210 }
 211
 212 void lcd_remote_scroll_delay(int ms)
 213 {
 214     lcd_remote_scroll_info.delay = ms / (HZ / 10);
 215 }
 216
 217 void lcd_remote_bidir_scroll(int percent)
 218 {
 219     lcd_remote_scroll_info.bidir_limit = percent;
 220 }
 221
 222 static void sync_display_ticks(void)
 223 {
 224     lcd_scroll_info.last_scroll =
 225     lcd_remote_scroll_info.last_scroll = current_tick;
 226 }
 227
 228 static bool scroll_process_message(int delay)
 229 {
 230     struct queue_event ev;
 231
 232     do
 233     {
 234         long tick = current_tick;
 235         queue_wait_w_tmo(&scroll_queue, &ev, delay);
 236
 237         switch (ev.id)
 238         {
 239         case SYS_TIMEOUT:
 240             return false;
 241         case SYS_USB_CONNECTED:
 242             usb_acknowledge(SYS_USB_CONNECTED_ACK);
 243             usb_wait_for_disconnect(&scroll_queue);
 244             sync_display_ticks();
 245             return true;
 246 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 247         case SYS_REMOTE_PLUGGED:
 248             if (!remote_initialized)
 249                 sync_display_ticks();
 250 #endif
 251         }
 252
 253         delay -= current_tick - tick;
 254     }
 255     while (delay > 0);
 256
 257     return false;
 258 }
 259 #endif /* HAVE_REMOTE_LCD */
 260
 261 static void scroll_thread(void) NORETURN_ATTR;
 262 #ifdef HAVE_REMOTE_LCD
 263
 264 static void scroll_thread(void)
 265 {
 266     enum
 267     {
 268         SCROLL_LCD        = 0x1,
 269         SCROLL_LCD_REMOTE = 0x2,
 270     };
 271
 272     sync_display_ticks();
 273
 274     while ( 1 )
 275     {
 276         long delay;
 277         int scroll;
 278         long tick_lcd, tick_remote;
 279
 280         tick_lcd = lcd_scroll_info.last_scroll + lcd_scroll_info.ticks;
 281         delay = current_tick;
 282
 283         if (
 284 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 285             !remote_initialized ||
 286 #endif
 287             (tick_remote = lcd_remote_scroll_info.last_scroll +
 288                            lcd_remote_scroll_info.ticks,
 289              TIME_BEFORE(tick_lcd, tick_remote)))
 290         {
 291             scroll = SCROLL_LCD;
 292             delay = tick_lcd - delay;
 293         }
 294         /* TIME_BEFORE(tick_remote, tick_lcd) */
 295         else if (tick_lcd != tick_remote)
 296         {
 297             scroll = SCROLL_LCD_REMOTE;
 298             delay = tick_remote - delay;
 299         }
 300         else
 301         {
 302             scroll = SCROLL_LCD | SCROLL_LCD_REMOTE;
 303             delay = tick_lcd - delay;
 304         }
 305
 306         if (scroll_process_message(delay))
 307             continue;
 308
 309         if (scroll & SCROLL_LCD)
 310         {
 311 #if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
 312             if (lcd_active())
 313 #endif
 314                 lcd_scroll_fn();
 315             lcd_scroll_info.last_scroll = current_tick;
 316         }
 317
 318         if (scroll == (SCROLL_LCD | SCROLL_LCD_REMOTE))
 319             yield();
 320
 321         if (scroll & SCROLL_LCD_REMOTE)
 322         {
 323             lcd_remote_scroll_fn();
 324             lcd_remote_scroll_info.last_scroll = current_tick;
 325         }
 326     }
 327 }
 328 #else
 329 static void scroll_thread(void)
 330 {
 331     while (1)
 332     {
 333         sleep(lcd_scroll_info.ticks);
 334 #if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
 335         if (lcd_active())
 336 #endif
 337             lcd_scroll_fn();
 338     }
 339 }
 340 #endif /* HAVE_REMOTE_LCD */
 341
 342 void scroll_init(void)
 343 {
 344 #ifdef HAVE_REMOTE_LCD
 345     queue_init(&scroll_queue, true);
 346 #endif
 347     create_thread(scroll_thread, scroll_stack,
 348                   sizeof(scroll_stack), 0, scroll_name
 349                   IF_PRIO(, PRIORITY_USER_INTERFACE)
 350                   IF_COP(, CPU));
 351 }
 352