1 files changed, 302 insertions, 0 deletions

diff --git a/firmware/scroll_engine.c b/firmware/scroll_engine.c
new file mode 100644
index 0000000000..d4a2e174cc
--- /dev/null
+++ b/firmware/scroll_engine.c
@@ -0,0 +1,302 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Michael Sevakis
+ *
+ * LCD scrolling driver and scheduler
+ *
+ * Much collected and combined from the various Rockbox LCD drivers.
+ *
+ * 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 "cpu.h"
+#include "kernel.h"
+#include "thread.h"
+#include "usb.h"
+#include "lcd.h"
+#include "font.h"
+#ifdef HAVE_REMOTE_LCD
+#include "lcd-remote.h"
+#endif
+#include "scroll_engine.h"
+
+static const char scroll_tick_table[16] = {
+ /* Hz values:
+    1, 1.25, 1.55, 2, 2.5, 3.12, 4, 5, 6.25, 8.33, 10, 12.5, 16.7, 20, 25, 33 */
+    100, 80, 64, 50, 40, 32, 25, 20, 16, 12, 10, 8, 6, 5, 4, 3
+};
+
+static void scroll_thread(void);
+static char scroll_stack[DEFAULT_STACK_SIZE*3];
+static const char scroll_name[] = "scroll";
+
+struct scrollinfo lcd_scroll[LCD_SCROLLABLE_LINES];
+
+#ifdef HAVE_REMOTE_LCD
+struct scrollinfo lcd_remote_scroll[LCD_REMOTE_SCROLLABLE_LINES];
+struct event_queue scroll_queue;
+#endif
+
+struct scroll_screen_info lcd_scroll_info =
+{
+    .scroll       = lcd_scroll,
+    .lines        = 0,
+    .ticks        = 12,
+    .delay        = HZ/2,
+    .bidir_limit  = 50,
+#ifdef HAVE_LCD_BITMAP
+    .step         = 6,
+#endif
+#ifdef HAVE_LCD_CHARCELLS
+    .jump_scroll_delay = HZ/4,
+    .jump_scroll       = 0,
+#endif
+};
+
+#ifdef HAVE_REMOTE_LCD
+struct scroll_screen_info lcd_remote_scroll_info =
+{
+    .scroll       = lcd_remote_scroll,
+    .lines        = 0,
+    .ticks        = 12,
+    .delay        = HZ/2,
+    .bidir_limit  = 50,
+    .step         = 6,
+};
+#endif /* HAVE_REMOTE_LCD */
+
+void lcd_stop_scroll(void)
+{
+    lcd_scroll_info.lines = 0;
+}
+
+void lcd_scroll_speed(int speed)
+{
+    lcd_scroll_info.ticks = scroll_tick_table[speed];
+}
+
+#if defined(HAVE_LCD_BITMAP)
+/* Reverse the invert setting of the scrolling line (if any) at given char
+   position.  Setting will go into affect next time line scrolls. */
+void lcd_invertscroll(int x, int y)
+{
+    struct scrollinfo *s;
+
+    (void)x;
+
+    if((unsigned)y>=LCD_SCROLLABLE_LINES) return;
+
+    s = &lcd_scroll_info.scroll[y];
+    s->invert = !s->invert;
+}
+
+void lcd_scroll_step(int step)
+{
+    lcd_scroll_info.step = step;
+}
+#endif
+
+void lcd_scroll_delay(int ms)
+{
+    lcd_scroll_info.delay = ms / (HZ / 10);
+}
+
+void lcd_bidir_scroll(int percent)
+{
+    lcd_scroll_info.bidir_limit = percent;
+}
+
+#ifdef HAVE_LCD_CHARCELLS
+void lcd_jump_scroll(int mode) /* 0=off, 1=once, ..., JUMP_SCROLL_ALWAYS */
+{
+    lcd_scroll_info.jump_scroll = mode;
+}
+
+void lcd_jump_scroll_delay(int ms)
+{
+    lcd_scroll_info.jump_scroll_delay = ms / (HZ / 10);
+}
+#endif
+
+#ifdef HAVE_REMOTE_LCD
+/* Reverse the invert setting of the scrolling line (if any) at given char
+   position.  Setting will go into affect next time line scrolls. */
+void lcd_remote_invertscroll(int x, int y)
+{
+    struct scrollinfo *s;
+
+    (void)x;
+
+    if((unsigned)y>=LCD_REMOTE_SCROLLABLE_LINES) return;
+
+    s = &lcd_remote_scroll_info.scroll[y];
+    s->invert = !s->invert;
+}
+
+void lcd_remote_stop_scroll(void)
+{
+    lcd_remote_scroll_info.lines = 0;
+}
+
+void lcd_remote_scroll_speed(int speed)
+{
+    lcd_remote_scroll_info.ticks = scroll_tick_table[speed];
+}
+
+void lcd_remote_scroll_step(int step)
+{
+    lcd_remote_scroll_info.step = step;
+}
+
+void lcd_remote_scroll_delay(int ms)
+{
+    lcd_remote_scroll_info.delay = ms / (HZ / 10);
+}
+
+void lcd_remote_bidir_scroll(int percent)
+{
+    lcd_remote_scroll_info.bidir_limit = percent;
+}
+
+static void sync_display_ticks(void)
+{
+    lcd_scroll_info.last_scroll =
+    lcd_remote_scroll_info.last_scroll = current_tick;
+}
+
+static bool scroll_process_message(int delay)
+{
+    struct event ev;
+
+    do
+    {
+        long tick = current_tick;
+        queue_wait_w_tmo(&scroll_queue, &ev, delay);
+
+        switch (ev.id)
+        {
+        case SYS_TIMEOUT:
+            return false;
+        case SYS_USB_CONNECTED:
+            usb_acknowledge(SYS_USB_CONNECTED_ACK);
+            usb_wait_for_disconnect(&scroll_queue);
+            sync_display_ticks();
+            return true;
+#ifndef SIMULATOR
+        case SYS_REMOTE_PLUGGED:
+            if (!remote_initialized)
+                sync_display_ticks();
+#endif
+        }
+
+        delay -= current_tick - tick;
+    }
+    while (delay > 0);
+
+    return false;
+}
+#endif /* HAVE_REMOTE_LCD */
+
+static void scroll_thread(void) __attribute__((noreturn));
+#ifdef HAVE_REMOTE_LCD
+
+static void scroll_thread(void)
+{
+    enum
+    {
+        SCROLL_LCD        = 0x1,
+        SCROLL_LCD_REMOTE = 0x2,
+    };
+
+    sync_display_ticks();
+
+    while ( 1 )
+    {
+        long delay;
+        int scroll;
+        long tick_lcd, tick_remote;
+
+        tick_lcd = lcd_scroll_info.last_scroll + lcd_scroll_info.ticks;
+        delay = current_tick;
+
+        if (
+#ifndef SIMULATOR
+            !remote_initialized ||
+#endif
+            (tick_remote = lcd_remote_scroll_info.last_scroll +
+                           lcd_remote_scroll_info.ticks,
+             TIME_BEFORE(tick_lcd, tick_remote)))
+        {
+            scroll = SCROLL_LCD;
+            delay = tick_lcd - delay;
+        }
+        /* TIME_BEFORE(tick_remote, tick_lcd) */
+        else if (tick_lcd != tick_remote)
+        {
+            scroll = SCROLL_LCD_REMOTE;
+            delay = tick_remote - delay;
+        }
+        else
+        {
+            scroll = SCROLL_LCD | SCROLL_LCD_REMOTE;
+            delay = tick_lcd - delay;
+        }
+
+        if (scroll_process_message(delay))
+            continue;
+
+        if (scroll & SCROLL_LCD)
+        {
+#ifdef HAVE_LCD_ENABLE
+            if (lcd_enabled())
+#endif
+                lcd_scroll_fn();
+            lcd_scroll_info.last_scroll = current_tick;
+        }
+
+        if (scroll == (SCROLL_LCD | SCROLL_LCD_REMOTE))
+            yield();
+
+        if (scroll & SCROLL_LCD_REMOTE)
+        {
+            lcd_remote_scroll_fn();
+            lcd_remote_scroll_info.last_scroll = current_tick;
+        }
+    }
+}
+#else
+static void scroll_thread(void)
+{
+    while (1)
+    {
+        sleep(lcd_scroll_info.ticks);
+#ifdef HAVE_LCD_ENABLE
+        if (lcd_enabled())
+#endif
+            lcd_scroll_fn();
+    }
+}
+#endif /* HAVE_REMOTE_LCD */
+
+void scroll_init(void)
+{
+#ifdef HAVE_REMOTE_LCD
+    queue_init(&scroll_queue, true);
+#endif
+    create_thread(scroll_thread, scroll_stack,
+                  sizeof(scroll_stack), scroll_name
+                  IF_PRIO(, PRIORITY_USER_INTERFACE)
+                  IF_COP(, CPU, false));
+}