sam3x-ek: add display backlight control

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4740 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/boards/sam3x-ek/hw/hw_lcd.h b/boards/sam3x-ek/hw/hw_lcd.h
new file mode 100644 (file)
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+++ b/boards/sam3x-ek/hw/hw_lcd.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Atmel SAM3X-EK LCD backlight control
+ *
+ * \author Stefano Fedrigo <aleph@develer.com>
+ */
+
+#ifndef HW_LCD_H
+#define HW_LCD_H
+
+#include <io/cm3.h>
+
+#include <cpu/attr.h>
+#include <cpu/types.h>
+#include <drv/timer.h>
+
+#define LCD_BACKLIGHT_MAX  32
+#define LCD_BACKLIGHT_PIN  BV(27)    // Port B
+
+
+INLINE void lcd_setBacklight(uint8_t level)
+{
+       if (level > LCD_BACKLIGHT_MAX)
+               level = LCD_BACKLIGHT_MAX;
+
+       PIOB_OER = LCD_BACKLIGHT_PIN;
+       PIOB_SODR = LCD_BACKLIGHT_PIN;
+       PIOB_PER = LCD_BACKLIGHT_PIN;
+
+       // Switch off backlight first
+       PIOB_CODR = LCD_BACKLIGHT_PIN;
+       timer_delay(1);
+
+       for (unsigned i = 0; i < level; i++)
+       {
+               PIOB_CODR = LCD_BACKLIGHT_PIN;
+               NOP;NOP;NOP;NOP;NOP;
+               PIOB_SODR = LCD_BACKLIGHT_PIN;
+               NOP;NOP;NOP;NOP;NOP;
+       }
+}
+
+#endif /* HW_LCD_H */