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 "cpu.h"
  27 #include "kernel.h"
  28 #include "thread.h"
  29 #include "usb.h"
  30 #include "lcd.h"
  31 #include "font.h"
  32 #ifdef HAVE_REMOTE_LCD
  33 #include "lcd-remote.h"
  34 #endif
  35 #include "scroll_engine.h"
  36
  37 static const char scroll_tick_table[16] = {
  38  /* Hz values:
  39     1, 1.25, 1.55, 2, 2.5, 3.12, 4, 5, 6.25, 8.33, 10, 12.5, 16.7, 20, 25, 33 */
  40     100, 80, 64, 50, 40, 32, 25, 20, 16, 12, 10, 8, 6, 5, 4, 3
  41 };
  42
  43 static void scroll_thread(void);
  44 static char scroll_stack[DEFAULT_STACK_SIZE*3];
  45 static const char scroll_name[] = "scroll";
  46
  47 static struct scrollinfo lcd_scroll[LCD_SCROLLABLE_LINES];
  48
  49 #ifdef HAVE_REMOTE_LCD
  50 struct scrollinfo lcd_remote_scroll[LCD_REMOTE_SCROLLABLE_LINES];
  51 struct event_queue scroll_queue;
  52 #endif
  53
  54 struct scroll_screen_info lcd_scroll_info =
  55 {
  56     .scroll       = lcd_scroll,
  57     .lines        = 0,
  58     .ticks        = 12,
  59     .delay        = HZ/2,
  60     .bidir_limit  = 50,
  61 #ifdef HAVE_LCD_BITMAP
  62     .step         = 6,
  63 #endif
  64 #ifdef HAVE_LCD_CHARCELLS
  65     .jump_scroll_delay = HZ/4,
  66     .jump_scroll       = 0,
  67 #endif
  68 };
  69
  70 #ifdef HAVE_REMOTE_LCD
  71 struct scroll_screen_info lcd_remote_scroll_info =
  72 {
  73     .scroll       = lcd_remote_scroll,
  74     .lines        = 0,
  75     .ticks        = 12,
  76     .delay        = HZ/2,
  77     .bidir_limit  = 50,
  78     .step         = 6,
  79 };
  80 #endif /* HAVE_REMOTE_LCD */
  81
  82 void lcd_stop_scroll(void)
  83 {
  84     lcd_scroll_info.lines = 0;
  85 }
  86
  87 /* Stop scrolling line y in the specified viewport, or all lines if y < 0 */
  88 void lcd_scroll_stop_line(struct viewport* current_vp, int y)
  89 {
  90     int i = 0;
  91
  92     while (i < lcd_scroll_info.lines)
  93     {
  94         if ((lcd_scroll_info.scroll[i].vp == current_vp) &&
  95             ((y < 0) || (lcd_scroll_info.scroll[i].y == y)))
  96         {
  97             /* If i is not the last active line in the array, then move
  98                the last item to position i */
  99             if ((i + 1) != lcd_scroll_info.lines)
 100             {
 101                 lcd_scroll_info.scroll[i] = lcd_scroll_info.scroll[lcd_scroll_info.lines-1];
 102             }
 103             lcd_scroll_info.lines--;
 104
 105             /* A line can only appear once, so we're done,
 106              * unless we are clearing the whole viewport */
 107             if (y >= 0)
 108                 return ;
 109         }
 110         else
 111         {
 112             i++;
 113         }
 114     }
 115 }
 116
 117 /* Stop all scrolling lines in the specified viewport */
 118 void lcd_scroll_stop(struct viewport* vp)
 119 {
 120     lcd_scroll_stop_line(vp, -1);
 121 }
 122
 123 void lcd_scroll_speed(int speed)
 124 {
 125     lcd_scroll_info.ticks = scroll_tick_table[speed];
 126 }
 127
 128 #if defined(HAVE_LCD_BITMAP)
 129 void lcd_scroll_step(int step)
 130 {
 131     lcd_scroll_info.step = step;
 132 }
 133 #endif
 134
 135 void lcd_scroll_delay(int ms)
 136 {
 137     lcd_scroll_info.delay = ms / (HZ / 10);
 138 }
 139
 140 void lcd_bidir_scroll(int percent)
 141 {
 142     lcd_scroll_info.bidir_limit = percent;
 143 }
 144
 145 #ifdef HAVE_LCD_CHARCELLS
 146 void lcd_jump_scroll(int mode) /* 0=off, 1=once, ..., JUMP_SCROLL_ALWAYS */
 147 {
 148     lcd_scroll_info.jump_scroll = mode;
 149 }
 150
 151 void lcd_jump_scroll_delay(int ms)
 152 {
 153     lcd_scroll_info.jump_scroll_delay = ms / (HZ / 10);
 154 }
 155 #endif
 156
 157 #ifdef HAVE_REMOTE_LCD
 158 void lcd_remote_stop_scroll(void)
 159 {
 160     lcd_remote_scroll_info.lines = 0;
 161 }
 162
 163 /* Stop scrolling line y in the specified viewport, or all lines if y < 0 */
 164 void lcd_remote_scroll_stop_line(struct viewport* current_vp, int y)
 165 {
 166     int i = 0;
 167
 168     while (i < lcd_remote_scroll_info.lines)
 169     {
 170         if ((lcd_remote_scroll_info.scroll[i].vp == current_vp) &&
 171             ((y < 0) || (lcd_remote_scroll_info.scroll[i].y == y)))
 172         {
 173             /* If i is not the last active line in the array, then move
 174                the last item to position i */
 175             if ((i + 1) != lcd_remote_scroll_info.lines)
 176             {
 177                 lcd_remote_scroll_info.scroll[i] = lcd_remote_scroll_info.scroll[lcd_remote_scroll_info.lines-1];
 178             }
 179             lcd_remote_scroll_info.lines--;
 180
 181             /* A line can only appear once, so we're done,
 182              * unless we are clearing the whole viewport */
 183             if (y >= 0)
 184                 return ;
 185         }
 186         else
 187         {
 188             i++;
 189         }
 190     }
 191 }
 192
 193 /* Stop all scrolling lines in the specified viewport */
 194 void lcd_remote_scroll_stop(struct viewport* vp)
 195 {
 196     lcd_remote_scroll_stop_line(vp, -1);
 197 }
 198
 199 void lcd_remote_scroll_speed(int speed)
 200 {
 201     lcd_remote_scroll_info.ticks = scroll_tick_table[speed];
 202 }
 203
 204 void lcd_remote_scroll_step(int step)
 205 {
 206     lcd_remote_scroll_info.step = step;
 207 }
 208
 209 void lcd_remote_scroll_delay(int ms)
 210 {
 211     lcd_remote_scroll_info.delay = ms / (HZ / 10);
 212 }
 213
 214 void lcd_remote_bidir_scroll(int percent)
 215 {
 216     lcd_remote_scroll_info.bidir_limit = percent;
 217 }
 218
 219 static void sync_display_ticks(void)
 220 {
 221     lcd_scroll_info.last_scroll =
 222     lcd_remote_scroll_info.last_scroll = current_tick;
 223 }
 224
 225 static bool scroll_process_message(int delay)
 226 {
 227     struct queue_event ev;
 228
 229     do
 230     {
 231         long tick = current_tick;
 232         queue_wait_w_tmo(&scroll_queue, &ev, delay);
 233
 234         switch (ev.id)
 235         {
 236         case SYS_TIMEOUT:
 237             return false;
 238         case SYS_USB_CONNECTED:
 239             usb_acknowledge(SYS_USB_CONNECTED_ACK);
 240             usb_wait_for_disconnect(&scroll_queue);
 241             sync_display_ticks();
 242             return true;
 243 #ifndef SIMULATOR
 244         case SYS_REMOTE_PLUGGED:
 245             if (!remote_initialized)
 246                 sync_display_ticks();
 247 #endif
 248         }
 249
 250         delay -= current_tick - tick;
 251     }
 252     while (delay > 0);
 253
 254     return false;
 255 }
 256 #endif /* HAVE_REMOTE_LCD */
 257
 258 static void scroll_thread(void) __attribute__((noreturn));
 259 #ifdef HAVE_REMOTE_LCD
 260
 261 static void scroll_thread(void)
 262 {
 263     enum
 264     {
 265         SCROLL_LCD        = 0x1,
 266         SCROLL_LCD_REMOTE = 0x2,
 267     };
 268
 269     sync_display_ticks();
 270
 271     while ( 1 )
 272     {
 273         long delay;
 274         int scroll;
 275         long tick_lcd, tick_remote;
 276
 277         tick_lcd = lcd_scroll_info.last_scroll + lcd_scroll_info.ticks;
 278         delay = current_tick;
 279
 280         if (
 281 #ifndef SIMULATOR
 282             !remote_initialized ||
 283 #endif
 284             (tick_remote = lcd_remote_scroll_info.last_scroll +
 285                            lcd_remote_scroll_info.ticks,
 286              TIME_BEFORE(tick_lcd, tick_remote)))
 287         {
 288             scroll = SCROLL_LCD;
 289             delay = tick_lcd - delay;
 290         }
 291         /* TIME_BEFORE(tick_remote, tick_lcd) */
 292         else if (tick_lcd != tick_remote)
 293         {
 294             scroll = SCROLL_LCD_REMOTE;
 295             delay = tick_remote - delay;
 296         }
 297         else
 298         {
 299             scroll = SCROLL_LCD | SCROLL_LCD_REMOTE;
 300             delay = tick_lcd - delay;
 301         }
 302
 303         if (scroll_process_message(delay))
 304             continue;
 305
 306         if (scroll & SCROLL_LCD)
 307         {
 308 #ifdef HAVE_LCD_ENABLE
 309             if (lcd_enabled())
 310 #endif
 311                 lcd_scroll_fn();
 312             lcd_scroll_info.last_scroll = current_tick;
 313         }
 314
 315         if (scroll == (SCROLL_LCD | SCROLL_LCD_REMOTE))
 316             yield();
 317
 318         if (scroll & SCROLL_LCD_REMOTE)
 319         {
 320             lcd_remote_scroll_fn();
 321             lcd_remote_scroll_info.last_scroll = current_tick;
 322         }
 323     }
 324 }
 325 #else
 326 static void scroll_thread(void)
 327 {
 328     while (1)
 329     {
 330         sleep(lcd_scroll_info.ticks);
 331 #ifdef HAVE_LCD_ENABLE
 332         if (lcd_enabled())
 333 #endif
 334             lcd_scroll_fn();
 335     }
 336 }
 337 #endif /* HAVE_REMOTE_LCD */
 338
 339 void scroll_init(void)
 340 {
 341 #ifdef HAVE_REMOTE_LCD
 342     queue_init(&scroll_queue, true);
 343 #endif
 344     create_thread(scroll_thread, scroll_stack,
 345                   sizeof(scroll_stack), 0, scroll_name
 346                   IF_PRIO(, PRIORITY_USER_INTERFACE)
 347                   IF_COP(, CPU));
 348 }