From 46ce1bc93240f6663d01031d3e1a6b6f0208e411 Mon Sep 17 00:00:00 2001
From: bernie <bernie@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Sat, 3 Jun 2006 13:57:15 +0000
Subject: [PATCH] Add simple screen blanker.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@658 38d2e660-2303-0410-9eaa-f027e97ec537
---
 mware/blanker.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++++
 mware/blanker.h |  21 ++++++
 2 files changed, 218 insertions(+)
 create mode 100755 mware/blanker.c
 create mode 100755 mware/blanker.h

diff --git a/mware/blanker.c b/mware/blanker.c
new file mode 100755
index 00000000..6e7f1103
--- /dev/null
+++ b/mware/blanker.c
@@ -0,0 +1,197 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2001 Bernardo Innocenti <bernie@codewiz.org>
+ * -->
+ *
+ * \brief Display Blanker (implementation).
+ *
+ * \version $Id$
+ *
+ * \author Bernardo Innocenti <bernie@develer.com>
+ */
+
+#include "blanker.h"
+#include <drv/kbd.h>
+#include <drv/timer.h>
+
+/* Time without input events before starting blanker */
+#define BLK_BLANKTIMEOUT	(15 * 1000)	/* ms */
+
+// TODO: move to blanker_hw.h
+#include <drv/power.h>
+#define BLK_LCDON	power_LcdOn()
+#define BLK_LCDOFF	power_LcdOff()
+
+
+/** Keyboard event handler to listen for key presses in blanker. */
+static KbdHandler blk_KbdHandler;
+
+/** Time since last key event. */
+static ticks_t blk_lastevent;
+
+/** Display blanking function is enabled. */
+static bool blk_enabled;
+
+/** Display blanker is engaged right now. */
+static bool blk_active;
+
+
+static bool blk_on(void)
+{
+	if (!blk_active)
+	{
+		blk_active = true;
+		BLK_LCDOFF;
+	}
+	return true;
+}
+
+
+static void blk_off(void)
+{
+	if (blk_active)
+	{
+		blk_active = false;
+		BLK_LCDON;
+	}
+}
+
+
+void blk_retrigger(void)
+{
+	blk_lastevent = timer_clock();
+	blk_off();
+}
+
+#if 0
+/**
+ * Matrix-like screen saver effect
+ */
+static void blk_hack(void)
+{
+	static signed char blk_colstart[LCD_COLS];
+	UBYTE row, col;
+
+
+	if (rand()%3 == 0)
+	{
+		/* Modify one column */
+		col = rand() % LCD_COLS;
+		blk_colstart[col] += rand() % 12 - 5;
+	}
+
+	for (col = 0; col < LCD_COLS; ++col)
+	{
+		if (blk_colstart[col] > 0)
+		{
+			--blk_colstart[col];
+
+			/* Scroll down */
+			for(row = LCD_ROWS-1; row; --row)
+			{
+				lcd_SetAddr(blk_layer, LCD_POS(col,row));
+				lcd_PutChar(blk_layer->Buf[LCD_POS(col,row-1)], blk_layer);
+			}
+
+			/* Add new kanji */
+			lcd_SetAddr(blk_layer, LCD_POS(col,0));
+			lcd_PutChar((char)(rand() % 127 + 128), blk_layer);
+		}
+		else if (blk_colstart[col] < 0)
+		{
+			++blk_colstart[col];
+
+			/* Clear tail */
+			for(row = 0; row < LCD_ROWS; ++row)
+			{
+				if (blk_layer->Buf[LCD_POS(col,row)] != ' ')
+				{
+					lcd_SetAddr(blk_layer, LCD_POS(col,row));
+					lcd_PutChar(' ', blk_layer);
+					break;
+				}
+			}
+		}
+	}
+}
+#endif
+
+
+static keymask_t blk_handlerFunc(keymask_t key)
+{
+	/* key used to turn off blanker */
+	static keymask_t offkey;
+
+	ticks_t now = timer_clock();
+
+	/* If key pressed */
+	if (key != 0)
+	{
+		blk_lastevent = now;
+		if (blk_active)
+		{
+			blk_off();
+
+			/* remember and eat key event */
+			offkey = key;
+			key = 0;
+		}
+		else if (key == offkey)
+		{
+			/* keep eating the key until released */
+			key = 0;
+		}
+
+		/* pass key through */
+		return key;
+	}
+
+	/* reset off key */
+	offkey = 0;
+
+	/* Blank timeout reached? */
+	if (now - blk_lastevent > ms_to_ticks(BLK_BLANKTIMEOUT))
+	{
+		/* Enable blanker unless already done */
+		if (!blk_active && !blk_on())
+			return 0;
+
+#if 0
+		/* Do some nice visual effect */
+		blk_hack();
+#endif /* _DEBUG */
+	}
+
+	return 0;
+}
+
+
+void blk_enable(void)
+{
+	if (!blk_enabled)
+	{
+		blk_active = false;
+		blk_lastevent = timer_clock();
+
+		/* Add display blanker handler */
+		blk_KbdHandler.hook = blk_handlerFunc;
+		blk_KbdHandler.pri = 100; /* high priority */
+		blk_KbdHandler.flags = KHF_RAWKEYS;
+		kbd_addHandler(&blk_KbdHandler);
+
+		blk_enabled = true;
+	}
+}
+
+
+void blk_disable(void)
+{
+	if (blk_enabled)
+	{
+		kbd_remHandler(&blk_KbdHandler);
+		blk_off();
+		blk_enabled = false;
+	}
+}
diff --git a/mware/blanker.h b/mware/blanker.h
new file mode 100755
index 00000000..ee49b440
--- /dev/null
+++ b/mware/blanker.h
@@ -0,0 +1,21 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2001 Bernardo Innocenti <bernie@codewiz.org>
+ * -->
+ *
+ * \brief Display Blanker (implementation).
+ *
+ * \version $Id$
+ *
+ * \author Bernardo Innocenti <bernie@develer.com>
+ */
+#ifndef MWARE_BLANKER_H
+#define MWARE_BLANKER_H
+
+extern void blk_enable(void);
+extern void blk_disable(void);
+extern void blk_retrigger(void);
+
+#endif /* MWARE_BLANKER_H */
-- 
2.25.1