From 2c997f95cb167e9023c1a44abaeda4ea80bbc7d3 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 8 Aug 2013 22:39:50 +0000
Subject: moved usb-i2c-sl018 to tuer-rfid

git-svn-id: https://svn.spreadspace.org/avr/trunk@216 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 tuer-rfid/limits.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 tuer-rfid/limits.c

(limited to 'tuer-rfid/limits.c')

diff --git a/tuer-rfid/limits.c b/tuer-rfid/limits.c
new file mode 100644
index 0000000..027a3b5
--- /dev/null
+++ b/tuer-rfid/limits.c
@@ -0,0 +1,103 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *                     Othmar Gsenger <otti@wirdorange.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <avr/io.h>
+#include "limits.h"
+
+#define LIMITS_PIN PINC
+#define LIMITS_PORT PORTC
+#define LIMITS_DDR DDRC
+#define LIMITS_OPEN 6
+#define LIMITS_CLOSE 7
+
+#define LIMITS_LP_MAX 255
+
+void limits_init(void)
+{
+  LIMITS_DDR = LIMITS_DDR & ~(1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
+  LIMITS_PORT |= (1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
+}
+
+uint8_t limits_get_close(uint8_t pin)
+{
+  static uint8_t last_state = 1<<LIMITS_CLOSE;
+  static uint8_t lp_cnt = 0;
+
+  uint8_t state = pin & (1<<LIMITS_CLOSE);
+  if(state != last_state)
+    lp_cnt++;
+  else
+    lp_cnt += lp_cnt ? -1 : 0;
+
+  if(lp_cnt >= LIMITS_LP_MAX) {
+    last_state = state;
+    lp_cnt = 0;
+  }
+
+  return last_state;
+}
+
+uint8_t limits_get_open(uint8_t pin)
+{
+  static uint8_t last_state = 1<<LIMITS_OPEN;
+  static uint8_t lp_cnt = 0;
+
+  uint8_t state = pin & (1<<LIMITS_OPEN);
+  if(state != last_state)
+    lp_cnt++;
+  else
+    lp_cnt += lp_cnt ? -1 : 0;
+
+  if(lp_cnt >= LIMITS_LP_MAX) {
+    last_state = state;
+    lp_cnt = 0;
+  }
+
+  return last_state;
+}
+
+limits_t limits_get(void)
+{
+  uint8_t tmp = LIMITS_PIN & (1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
+  if(!limits_get_open(tmp)) {
+    if(limits_get_close(tmp))
+      return open;
+    else
+      return both;
+  }
+  else if(!limits_get_close(tmp))
+    return close;
+
+  return moving;
+}
+
+const char* limits_to_string(limits_t limits)
+{
+  switch(limits) {
+    case moving: return "...";
+    case open: return "opened";
+    case close: return "closed";
+    case both: return "error";
+  }
+  return "invalid"; // gcc - shut the fuck up!!!
+}
-- 
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