From c3bbbdefb9f72672c6717285bc94304a7eb97347 Mon Sep 17 00:00:00 2001
From: lottaviano <lottaviano@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 16 Mar 2011 13:33:13 +0000
Subject: [PATCH] Add seven segment LED display implementation for Arduino
 Mega.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4780 38d2e660-2303-0410-9eaa-f027e97ec537
---
 boards/arduino-mega/hw/hw_led_7seg.h | 313 +++++++++++++++++++++++++++
 1 file changed, 313 insertions(+)
 create mode 100644 boards/arduino-mega/hw/hw_led_7seg.h

diff --git a/boards/arduino-mega/hw/hw_led_7seg.h b/boards/arduino-mega/hw/hw_led_7seg.h
new file mode 100644
index 00000000..8962eb31
--- /dev/null
+++ b/boards/arduino-mega/hw/hw_led_7seg.h
@@ -0,0 +1,313 @@
+/**
+ * \file hw_led_7seg.h
+ * <!--
+ * 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 led 7 segment display low-level
+ *
+ * This file has the functions that must be
+ * implemented to drive the 7 segments display by your
+ * hardware
+ *
+ * \author Fabio Bizzi <fbizzi@bizzi.org>
+ *
+ * \addtogroup SevenSegDisplay 7 Segments LED Displays Driver
+ * \{
+ *
+ * Example implementation for AtMEGA 1280
+ * (Arduino MEGA) with a 4 digit display.
+ * We use PORTA to connect the 8 pins of
+ * the 7 segments display and 4 bit of
+ * PORTC to select which digit of the
+ * display we have to write on.
+ *
+ * \code
+ *  7 Seg LED Pin
+ *  ----------------
+ *  LED SEGMENT
+ *  ----------------
+ *  DP G F E D C B A
+ *  7  6 5 4 3 2 1 0
+ *  ----------------
+ *  PORT A Pin
+ *  ----------------
+ *
+ *  7 Seg Display Selection
+ *  ----------------
+ *  Display Nr.
+ *  ----------------
+ *  N N N N 3 2 1 0
+ *  7 6 5 4 3 2 1 0
+ *  ----------------
+ *  PORT C Pin
+ *  ----------------
+ * \endcode
+ *
+ * The implementation of the sseg_on procedure that set the PROPER PIN of PORT C
+ * to enable the requested digit of the display, after write the encoded character
+ * to PORT A
+ *
+ * \code
+ *
+ * INLINE void sseg_on(uint8_t dgt, uint8_t n_dgt)
+ * {
+ *  switch (n_dgt)
+ *  {
+ * //Common Cathode
+ * #ifdef CONFIG_LED_7SEG_CCAT
+ *
+ *		case 0:
+ *			PORTC &= ~(BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+ *			PORTC |= BV(PORTC0);
+ *			break;
+ *		case 1:
+ *			PORTC &= ~(BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
+ *			PORTC |= BV(PORTC1);
+ *			break;
+ *		case 2:
+ *			PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
+ *			PORTC |= BV(PORTC2);
+ *			break;
+ *		case 3:
+ *			PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
+ *			PORTC |= BV(PORTC3);
+ *			break;
+ *
+ * //Common Anode
+ * #else
+ *
+ *		case 0:
+ *			PORTC |= (BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+ *			PORTC &= ~(BV(PORTC0));
+ *			break;
+ *		case 1:
+ *			PORTC |= (BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
+ *			PORTC &= ~(BV(PORTC1));
+ *			break;
+ *		case 2:
+ *			PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
+ *			PORTC &= ~(BV(PORTC2));
+ *			break;
+ *		case 3:
+ *			PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
+ *			PORTC &= ~(BV(PORTC3));
+ *			break;
+ *
+ * #endif
+ *
+ *	}
+ *	//Write the charater
+ *	PORTA = dgt;
+ * }
+ *
+ * \endcode
+ *
+ * The implementation of the sseg_init procedure that set the DIRECTION of PORT C
+ * and PORT A to output
+ *
+ * \code
+ *
+ * INLINE void sseg_init(void)
+ * {
+ * //Initialize PIN Direction to OUTPUT
+ *	DDRA = 0xFF;
+ *	DDRC |= (BV(DDC0) | BV(DDC1) | BV(DDC2) | BV(DDC3));
+ *	//Set the display OFF
+ *	SSEG_OFF();
+ * }
+ *
+ * \endcode
+ *
+ * The implementation of the sseg_off procedure that set the reset PORT A
+ * to clean the display and turn off all the pin of PORT C that drive the
+ * display's digits
+ *
+ * \code
+ *
+ * INLINE void sseg_off(void)
+ * {
+ * //Set the display OFF
+ * //Common Cathode
+ * #ifdef CONFIG_LED_7SEG_CCAT
+ *    PORTA = 0x00;
+ *    PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+ * //Common Anode
+ * #else
+ *    PORTA = 0xFF;
+ *    PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+ * #endif
+ *
+ * }
+ *
+ * \endcode
+ *
+ */
+
+#ifndef HW_LED_7SEG_H
+#define HW_LED_7SEG_H
+
+#include "cfg/cfg_led_7seg.h"
+#include "cfg/cfg_arch.h"
+#include <cpu/types.h>
+#include <cpu/irq.h>
+#include <drv/timer.h>
+#include <string.h>
+
+/*
+ * INLINE HW Functions
+ */
+
+/**
+ * \brief Clean the display
+ *
+ * This is the procedure that clean the display in HW mode.
+ * you have to write it according with your hardware and micro.
+ */
+INLINE void sseg_off(void)
+{
+/* Example implementation for AtMEGA 1280
+ * (Arduino MEGA) with a 4 digit display.
+ * We use PORTA to connect the 8 pins of
+ * the 7 segments display and 4 bit of
+ * PORTC to select which digit of the
+ * display we have to write on.
+ */
+
+	/* Set the display OFF */
+/* Common Cathode */
+#ifdef CONFIG_LED_7SEG_CCAT
+	PORTA = 0x00;
+	PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+/* Common Anode */
+#else
+	PORTA = 0xFF;
+	PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+#endif
+}
+
+/**
+ * \brief writes the character to the single digit of the display
+ *
+ * This is the procedure that writes the character to the single digit
+ * of the display, you have to write it according with your hardware and micro.
+ *
+ * 	\param dgt the character that has to be displayed
+ * 	\param n_dgt the digit where to disply the character of the display's digits.
+ */
+INLINE void sseg_on(uint8_t dgt, uint8_t n_dgt)
+{
+/* Example implementation for AtMEGA 1280
+ * (Arduino MEGA) with a 4 digit display.
+ * We use PORTA to connect the 8 pins of
+ * the 7 segments display and 4 bit of
+ * PORTC to select which digit of the
+ * display we have to write on.
+ *
+ * 7 Seg LED Pin
+ * ----------------
+ * DP G F E D C B A
+ * 7  6 5 4 3 2 1 0
+ * ----------------
+ * PORT A Pin
+ *
+ */
+	switch (n_dgt)
+	{
+/* Common Cathode */
+#ifdef CONFIG_LED_7SEG_CCAT
+
+		case 0:
+			PORTC &= ~(BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+			PORTC |= BV(PORTC0);
+			break;
+		case 1:
+			PORTC &= ~(BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
+			PORTC |= BV(PORTC1);
+			break;
+		case 2:
+			PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
+			PORTC |= BV(PORTC2);
+			break;
+		case 3:
+			PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
+			PORTC |= BV(PORTC3);
+			break;
+
+/* Common Anode */
+#else
+
+		case 0:
+			PORTC |= (BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
+			PORTC &= ~(BV(PORTC0));
+			break;
+		case 1:
+			PORTC |= (BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
+			PORTC &= ~(BV(PORTC1));
+			break;
+		case 2:
+			PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
+			PORTC &= ~(BV(PORTC2));
+			break;
+		case 3:
+			PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
+			PORTC &= ~(BV(PORTC3));
+			break;
+
+#endif
+	}
+	/* Write the charater */
+	PORTA = dgt;
+}
+
+/**
+ * \brief initalize the HW regsiters
+ *
+ * This is the procedure that initalize the HW regsiters.
+ * you have to write it according with your hardware and micro.
+ */
+INLINE void sseg_init(void)
+{
+/* Example implementation for AtMEGA 1280
+ * (Arduino MEGA) with a 4 digit display.
+ * We use PORTA to connect the 8 pins of
+ * the 7 segments display and 4 bit of
+ * PORTC to select which digit of the
+ * display we have to write on.
+ */
+
+	/* Initialize PIN Direction to OUTPUT*/
+	DDRA = 0xFF;
+	DDRC |= (BV(DDC0) | BV(DDC1) | BV(DDC2) | BV(DDC3));
+	/* Set the display OFF */
+	sseg_off();
+}
+
+#endif /* HW_LED_7SEG_H */
+
+ /** \} */ //defgroup drivers
\ No newline at end of file
-- 
2.25.1