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An attempt to filter the button reading

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5109 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2004-09-23 12:08:48 +00:00
parent 8e55d0cca0
commit 5f8ffa02a6
1 changed files with 19 additions and 9 deletions
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28
firmware/drivers/button.c
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@ -35,25 +35,26 @@
struct event_queue button_queue;
static int lastbtn;
static int lastbtn; /* Last valid button status */
static int last_read; /* Last button status, for debouncing/filtering */
#if defined(HAVE_RECORDER_KEYPAD) || defined(HAVE_ONDIO_KEYPAD)
static bool flipped; /* bottons can be flipped to match the LCD flip */
#endif
/* how often we check to see if a button is pressed */
#define POLL_FREQUENCY HZ/20
#define POLL_FREQUENCY HZ/100
/* how long until repeat kicks in */
#define REPEAT_START 6
#define REPEAT_START 30
/* the speed repeat starts at */
#define REPEAT_INTERVAL_START 4
#define REPEAT_INTERVAL_START 16
/* speed repeat finishes at */
#define REPEAT_INTERVAL_FINISH 2
#define REPEAT_INTERVAL_FINISH 5
/* Number of repeated keys before shutting off */
#define POWEROFF_COUNT 8
#define POWEROFF_COUNT 40
static int button_read(void);
@ -275,6 +276,7 @@ void button_set_flip(bool flip)
static int button_read(void)
{
int btn = BUTTON_NONE;
int retval;
/* Check port B pins for ON and OFF */
int data;
@ -333,9 +335,17 @@ static int button_read(void)
}
if (btn && flipped)
return button_flip(btn); /* swap upside down */
return btn;
btn = button_flip(btn); /* swap upside down */
/* Filter the button status. It is only accepted if we get the same
status twice in a row. */
if(btn != last_read)
retval = lastbtn;
else
retval = btn;
last_read = btn;
return retval;
}
#elif defined(HAVE_PLAYER_KEYPAD)