Logarithmic scroll speed setting: speed doubles every 3 steps.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5288 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 24 insertions, 12 deletions

diff --git a/apps/settings.c b/apps/settings.c
index bbb37db..4bb9adb 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -71,7 +71,7 @@ const char rec_base_directory[] = REC_BASE_DIR;
 
 
 
-#define CONFIG_BLOCK_VERSION 17
+#define CONFIG_BLOCK_VERSION 18
 #define CONFIG_BLOCK_SIZE 512
 #define RTC_BLOCK_SIZE 44
 
@@ -250,7 +250,7 @@ static const struct bit_entry hd_bits[] =
 #ifdef HAVE_BACKLIGHT
     {1, S_O(caption_backlight), false, "caption backlight", off_on },
 #endif
-    {5, S_O(scroll_speed), 8, "scroll speed", NULL }, /* 1...25 */
+    {4, S_O(scroll_speed), 9, "scroll speed", NULL }, /* 0...15 */
     {7, S_O(scroll_step), 6, "scroll step", NULL }, /* 1...112 */
     {8, S_O(scroll_delay), 100, "scroll delay", NULL }, /* 0...250 */
     {8, S_O(bidir_limit), 50, "bidir limit", NULL }, /* 0...200 */
diff --git a/apps/settings_menu.c b/apps/settings_menu.c
index 8877818..9ddf4c4 100644
--- a/apps/settings_menu.c
+++ b/apps/settings_menu.c
@@ -636,9 +636,9 @@ static bool poweroff_idle_timer(void)
 
 static bool scroll_speed(void)
 {
-    return set_int(str(LANG_SCROLL), "Hz", UNIT_HERTZ,
-                   &global_settings.scroll_speed, 
-                   &lcd_scroll_speed, 1, 1, 25 );
+    return set_int(str(LANG_SCROLL), "", UNIT_INT,
+                   &global_settings.scroll_speed,
+                   &lcd_scroll_speed, 1, 0, 15 );
 }
 
 
diff --git a/firmware/drivers/lcd-player.c b/firmware/drivers/lcd-player.c
index 01d7cfd..8dd97ca 100644
--- a/firmware/drivers/lcd-player.c
+++ b/firmware/drivers/lcd-player.c
@@ -88,7 +88,7 @@ struct cursorinfo {
 static void scroll_thread(void);
 static char scroll_stack[DEFAULT_STACK_SIZE];
 static const char scroll_name[] = "scroll";
-static char scroll_speed = 8; /* updates per second */
+static char scroll_ticks = 12; /* # of ticks between updates */
 static int scroll_delay = HZ/2; /* delay before starting scroll */
 static int jump_scroll_delay = HZ/4; /* delay between jump scroll jumps */
 static char scroll_spacing = 3; /* spaces between end and start of text */
@@ -547,7 +547,7 @@ void lcd_puts_scroll(int x, int y, const unsigned char* string )
         s->direction=+1;
         s->jump_scroll=0;
         s->jump_scroll_steps=0;
-        if (jump_scroll && jump_scroll_delay<(HZ/scroll_speed)*(s->textlen-11+x)) {
+        if (jump_scroll && jump_scroll_delay<scroll_ticks*(s->textlen-11+x)) {
             s->jump_scroll_steps=11-x;
             s->jump_scroll=jump_scroll;
         }
@@ -593,9 +593,15 @@ void lcd_allow_bidirectional_scrolling(bool on)
     allow_bidirectional_scrolling=on;
 }
 
+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
+};
+
 void lcd_scroll_speed(int speed)
 {
-    scroll_speed = speed;
+    scroll_ticks = scroll_tick_table[speed];
 }
 
 void lcd_scroll_delay(int ms)
@@ -723,7 +729,7 @@ static void scroll_thread(void)
             }
         }
 
-        sleep(HZ/scroll_speed);
+        sleep(scroll_ticks);
     }
 }
 
diff --git a/firmware/drivers/lcd-recorder.c b/firmware/drivers/lcd-recorder.c
index a711a8f..8f8e9f9 100644
--- a/firmware/drivers/lcd-recorder.c
+++ b/firmware/drivers/lcd-recorder.c
@@ -94,7 +94,7 @@ static volatile int scrolling_lines=0; /* Bitpattern of which lines are scrollin
 static void scroll_thread(void);
 static char scroll_stack[DEFAULT_STACK_SIZE];
 static const char scroll_name[] = "scroll";
-static char scroll_speed = 8; /* updates per second */
+static char scroll_ticks = 12; /* # of ticks between updates*/
 static int scroll_delay = HZ/2; /* ticks delay before start */
 static char scroll_step = 6;  /* pixels per scroll step */
 static int bidir_limit = 50;  /* percent */
@@ -856,9 +856,15 @@ void lcd_stop_scroll(void)
     scrolling_lines=0;
 }
 
+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
+};
+
 void lcd_scroll_speed(int speed)
 {
-    scroll_speed = speed;
+    scroll_ticks = scroll_tick_table[speed];
 }
 
 void lcd_scroll_step(int step)
@@ -933,7 +939,7 @@ static void scroll_thread(void)
             lcd_update_rect(xpos, ypos, LCD_WIDTH - xpos, pf->height);
         }
 
-        sleep(HZ/scroll_speed);
+        sleep(scroll_ticks);
     }
 }