From 23f2a59865ef4752d943decd4c48aede12c737cc Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Thu, 23 Sep 2004 22:36:15 +0000
Subject: [PATCH] Added debouncing to the Ondio button driver.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5115 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/button.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index 6e4106fbae..ebe3389454 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -458,6 +458,8 @@ void button_init(void)
 static int button_read(void)
 {
     int btn = BUTTON_NONE;
+    int retval;
+
     int data = adc_read(ADC_BUTTON_ROW1);
 
     if(adc_read(ADC_BUTTON_OPTION) > 0x200) /* active high */
@@ -475,7 +477,15 @@ static int button_read(void)
     else if (data >= 0x0A1)
         btn |= BUTTON_DOWN;
 
-    return btn;
+    /* 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;
 }
 
 #endif