From c9daddb636b3c03b5c53da2ef8e11b927927dd04 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 7 Feb 2013 02:15:37 +0000
Subject: lowpass filterd manual switch

git-svn-id: https://svn.spreadspace.org/avr/trunk@167 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-i2c-sl018/manual.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'usb-i2c-sl018/manual.c')

diff --git a/usb-i2c-sl018/manual.c b/usb-i2c-sl018/manual.c
index 3333a80..36f1a6c 100644
--- a/usb-i2c-sl018/manual.c
+++ b/usb-i2c-sl018/manual.c
@@ -30,6 +30,8 @@
 #define MANUAL_DDR DDRF
 #define MANUAL_BIT 0
 
+#define MANUAL_LP_MAX 255
+
 void init_manual(void)
 {
   MANUAL_DDR = MANUAL_DDR & ~(1<<MANUAL_BIT);
@@ -39,9 +41,18 @@ void init_manual(void)
 void manual_task(void)
 {
   static uint8_t last_state = 0;
+  static uint8_t lp_cnt = 0;
+
   uint8_t state = MANUAL_PIN & (1<<MANUAL_BIT);
-  if(state && state != last_state)
-    eventqueue_push(btn_toggle);
+  if(state != last_state)
+    lp_cnt++;
+  else
+    lp_cnt += lp_cnt ? -1 : 0;
 
-  last_state = state;
+  if(lp_cnt >= MANUAL_LP_MAX) {
+    if(state)
+      eventqueue_push(btn_toggle);
+    last_state = state;
+    lp_cnt = 0;
+  }
 }
-- 
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