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233
bertos/hw/hw_led_7seg.h
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233
bertos/hw/hw_led_7seg.h
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/**
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* \file hw_led_7seg.h
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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* -->
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*
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* \brief led 7 segment display low-level
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*
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* This file has the functions that must be
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* implemented to drive the 7 segments display by your
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* hardware
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*
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* \author Fabio Bizzi <fbizzi@bizzi.org>
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*
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* Example implementation for AtMEGA 1280
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* (Arduino MEGA) with a 4 digit display.
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* We use PORTA to connect the 8 pins of
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* the 7 segments display and 4 bit of
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* PORTC to select which digit of the
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* display we have to write on.
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*
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* \code
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* 7 Seg LED Pin
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* ----------------
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* LED SEGMENT
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* ----------------
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* DP G F E D C B A
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* 7 6 5 4 3 2 1 0
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* ----------------
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* PORT A Pin
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* ----------------
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*
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* 7 Seg Display Selection
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* ----------------
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* Display Nr.
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* ----------------
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* N N N N 3 2 1 0
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* 7 6 5 4 3 2 1 0
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* ----------------
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* PORT C Pin
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* ----------------
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* \endcode
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*
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* The implementation of the sseg_on procedure that set the PROPER PIN of PORT C
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* to enable the requested digit of the display, after write the encoded character
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* to PORT A
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*
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* \code
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*
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* INLINE void sseg_on(uint8_t dgt, uint8_t n_dgt)
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* {
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* switch (n_dgt)
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* {
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* //Common Cathode
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* #ifdef CONFIG_LED_7SEG_CCAT
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*
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* case 0:
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* PORTC &= ~(BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
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* PORTC |= BV(PORTC0);
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* break;
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* case 1:
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* PORTC &= ~(BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
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* PORTC |= BV(PORTC1);
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* break;
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* case 2:
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* PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
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* PORTC |= BV(PORTC2);
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* break;
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* case 3:
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* PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
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* PORTC |= BV(PORTC3);
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* break;
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*
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* //Common Anode
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* #else
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*
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* case 0:
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* PORTC |= (BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
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* PORTC &= ~(BV(PORTC0));
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* break;
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* case 1:
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* PORTC |= (BV(PORTC0) | BV(PORTC2) | BV(PORTC3));
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* PORTC &= ~(BV(PORTC1));
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* break;
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* case 2:
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* PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC3));
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* PORTC &= ~(BV(PORTC2));
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* break;
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* case 3:
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* PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2));
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* PORTC &= ~(BV(PORTC3));
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* break;
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*
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* #endif
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*
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* }
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* //Write the charater
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* PORTA = dgt;
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* }
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*
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* \endcode
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*
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* The implementation of the sseg_init procedure that set the DIRECTION of PORT C
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* and PORT A to output
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*
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* \code
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*
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* INLINE void sseg_init(void)
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* {
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* //Initialize PIN Direction to OUTPUT
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* DDRA = 0xFF;
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* DDRC |= (BV(DDC0) | BV(DDC1) | BV(DDC2) | BV(DDC3));
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* //Set the display OFF
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* SSEG_OFF();
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* }
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*
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* \endcode
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*
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* The implementation of the sseg_off procedure that set the reset PORT A
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* to clean the display and turn off all the pin of PORT C that drive the
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* display's digits
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*
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* \code
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*
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* INLINE void sseg_off(void)
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* {
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* //Set the display OFF
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* //Common Cathode
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* #ifdef CONFIG_LED_7SEG_CCAT
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* PORTA = 0x00;
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* PORTC &= ~(BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
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* //Common Anode
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* #else
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* PORTA = 0xFF;
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* PORTC |= (BV(PORTC0) | BV(PORTC1) | BV(PORTC2) | BV(PORTC3));
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* #endif
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*
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* }
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*
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* \endcode
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*
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*/
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#ifndef HW_LED_7SEG_H
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#define HW_LED_7SEG_H
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#include "cfg/cfg_led_7seg.h"
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/*
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* INLINE HW Functions
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*/
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/**
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* \brief Clean the display
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*
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* This is the procedure that clean the display in HW mode.
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* you have to write it according with your hardware and micro.
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*/
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INLINE void sseg_off(void)
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{
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/* Set the display OFF */
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#ifdef CONFIG_LED_7SEG_CCAT
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/* You have to implment it */
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/* Common Cathode */
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#else
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/* You have to implment it */
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/* Common Anode */
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#endif
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}
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/**
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* \brief writes the character to the single digit of the display
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*
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* This is the procedure that writes the character to the single digit
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* of the display, you have to write it according with your hardware and micro.
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*
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* \param dgt the character that has to be displayed
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* \param n_dgt the digit where to disply the character of the display's digits.
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*/
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INLINE void sseg_on(uint8_t dgt, uint8_t n_dgt)
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{
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(void) dgt;
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(void) n_dgt;
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#ifdef CONFIG_LED_7SEG_CCAT
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/* Common Cathode */
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/* You have to implment it */
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#else
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/* Common Anode */
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/* You have to implment it */
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#endif
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}
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/**
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* \brief initalize the HW regsiters
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*
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* This is the procedure that initalize the HW regsiters.
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* you have to write it according with your hardware and micro.
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*/
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INLINE void sseg_init(void)
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{
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/* Initialize PIN Direction to OUTPUT*/
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/* You have to implment it */
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/* Set the display OFF */
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sseg_off();
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}
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#endif /* HW_LED_7SEG_H */
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