From 061430973e82995368d27ff9081391f9475da3c7 Mon Sep 17 00:00:00 2001
From: James McKenzie <git@madingley.org>
Date: Mon, 3 Aug 2015 10:34:07 +0100
Subject: fish

---
 app/keypad.c | 148 ++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 106 insertions(+), 42 deletions(-)

(limited to 'app/keypad.c')

diff --git a/app/keypad.c b/app/keypad.c
index daea5c7..d4a82db 100644
--- a/app/keypad.c
+++ b/app/keypad.c
@@ -7,76 +7,140 @@
 
 #define KEYPAD_DELAY do { delay_us(1); } while (0)
 
-uint16_t keypad_read(void)
-{
-uint16_t ret=0;
-uint16_t c;
 
-/*Reset the state machine in the keypad */
+#define SCAN_INTERVAL 73
+#define DEBOUNCE_INTERVAL 1
+#define DEBOUNCE_COUNT 3
 
-gpio_set (GPIO_DATA, DATA);
-KEYPAD_DELAY;
-gpio_clear (GPIO_DATA, DATA);
-KEYPAD_DELAY;
-gpio_set (GPIO_DATA, DATA);
-KEYPAD_DELAY;
+static uint32_t next_scan;
 
-gpio_clear (GPIO_CLOCK, CLOCK);
-KEYPAD_DELAY;
 
-for (c=0x8000;c;c>>=1)
+uint16_t
+keypad_raw_read (void)
 {
-gpio_set (GPIO_CLOCK, CLOCK);
-KEYPAD_DELAY;
-if (!(gpio_get (GPIO_DATA, DATA) & DATA)) ret|=c;
-gpio_clear (GPIO_CLOCK, CLOCK);
-KEYPAD_DELAY;
-}
+  uint16_t ret = 0;
+  uint16_t c;
 
-gpio_set (GPIO_CLOCK, CLOCK);
+/*Reset the state machine in the keypad */
 
-return ret;
+  gpio_set (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+  gpio_clear (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+  gpio_set (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+
+  gpio_clear (GPIO_CLOCK, CLOCK);
+  KEYPAD_DELAY;
+
+  for (c = 0x8000; c; c >>= 1)
+    {
+      gpio_set (GPIO_CLOCK, CLOCK);
+      KEYPAD_DELAY;
+      if (!(gpio_get (GPIO_DATA, DATA) & DATA))
+        ret |= c;
+      gpio_clear (GPIO_CLOCK, CLOCK);
+      KEYPAD_DELAY;
+    }
+
+  gpio_set (GPIO_CLOCK, CLOCK);
+
+  return ret;
 }
 
-static void
-keypad_scan (void)
+uint16_t
+keypad_read (void)
 {
+  int c;
+  const uint8_t lut[] = "cdef89ab45670123";
+  uint8_t ret = 0;
 
-  uint16_t v;
-  char buf[16];
 
 
-  v=keypad_read();
-
-  sprintf (buf, "%04x", v);
-  lcd_write (buf, 0, 1);
-
+/*Reset the state machine in the keypad */
 
+  gpio_set (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+  gpio_clear (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+  gpio_set (GPIO_DATA, DATA);
+  KEYPAD_DELAY;
+
+  gpio_clear (GPIO_CLOCK, CLOCK);
+  KEYPAD_DELAY;
+
+  for (c = 0; c < 16; ++c)
+    {
+      gpio_set (GPIO_CLOCK, CLOCK);
+      KEYPAD_DELAY;
+      if (!(gpio_get (GPIO_DATA, DATA) & DATA))
+        ret = lut[c];
+      gpio_clear (GPIO_CLOCK, CLOCK);
+      KEYPAD_DELAY;
+    }
+
+  gpio_set (GPIO_CLOCK, CLOCK);
+
+  return ret;
 }
 
-void
-keypad_tick (void)
-{
-  static int c;
 
-  c++;
+static void
+keypad_scan (void)
+{
+  static uint8_t last_v;
+  static uint8_t key_down;
+  static int same;
+  uint8_t v;
+
+  v = keypad_read ();
+
+  next_scan = DEBOUNCE_INTERVAL;
+
+  if (v!=last_v) {
+     last_v=v;
+     same=0;
+     return;
+  } else {
+     if (same<DEBOUNCE_COUNT) {
+     	same++;
+	return;
+     }
+  }
+
+  if (!v && !key_down)  {	
+      next_scan = SCAN_INTERVAL;
+      return;
+  }
+
+	if (key_down==v) {
+		return;
+	} else if (key_down!=v) {
+	  if (key_down)
+          key_event (key_down, 0);
+	key_down=v;
+	  if (key_down)
+          key_event (key_down, 1);
+	}
+}
 
-  if (c < 73)
-    return;
 
-  c = 0;
 
 
-  keypad_scan ();
+void
+keypad_tick (void)
+{
 
+  if (!next_scan)
+    keypad_scan ();
+  else
+    next_scan--;
 
 }
 
 
 
 
-
-
 void
 keypad_init (void)
 {
-- 
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