94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
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/*
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* c't-Bot
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your
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* option) any later version.
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307, USA.
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*
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*/
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/*! @file shift.c
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* @brief Routinen zur Ansteuerung der Shift-Register
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* @author Benjamin Benz (bbe@heise.de)
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* @date 20.12.05
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*/
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#include "global.h"
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#include "ct-Bot.h"
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#include "shift.h"
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#ifdef MCU
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#ifdef SHIFT_AVAILABLE
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#include <avr/io.h>
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#ifdef NEW_AVR_LIB
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#include <util/delay.h>
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#else
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#include <avr/delay.h>
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#endif
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#define SHIFT_OUT 0x1F /*!< Alle Pins die Ausgänge sind */
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#define SHIFT_PORT PORTC /*!< Port an dem die Register haengen */
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#define SHIFT_DDR DDRC /*!< DDR des Ports an dem die Register haengen */
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/*!
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* Initialisert die Shift-Register
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*/
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void shift_init(){
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SHIFT_DDR |= SHIFT_OUT; // Ausgänge Schalten
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SHIFT_PORT &= ~SHIFT_OUT; // Und auf Null
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}
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/*!
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* Schiebt Daten durch eines der drei 74HC595 Schieberegister
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* Achtung den Port sollte man danach noch per shift_clear() zurücksetzen
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* @param data Das Datenbyte
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* @param latch_data der Pin an dem der Daten-latch-Pin des Registers (PIN 11) hängt
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* @param latch_store der Pin an dem der latch-Pin zum transfer des Registers (PIN 12) hängt
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*/
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void shift_data_out(uint8 data, uint8 latch_data, uint8 latch_store){
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int8 i;
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SHIFT_PORT &= ~SHIFT_OUT; // und wieder clear
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for (i=8; i>0; i--){
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SHIFT_PORT |= ((data >> 7)& 0x01); // Das oberste Bit von data auf PC0.0 (Datenleitung Schieberegister)
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SHIFT_PORT |= latch_data ; // und ins jeweilige Storageregister latchen
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data= data << 1; // data links schieben
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SHIFT_PORT &= ~SHIFT_OUT; // und wieder clear
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}
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SHIFT_PORT |= latch_store; // alles vom Storage ins Output register latchen
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}
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/*!
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* Schiebt Daten durch eines der drei 74HC595 Schieberegister
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* vereinfachte Version, braucht kein shift_clear()
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* geht NICHT für das Shift-register, an dem das Display-hängt!!!
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* @param data Das Datenbyte
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* @param latch_data der Pin an dem der Daten-latch-Pin des Registers (PIN 11) hängt
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*/
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void shift_data(uint8 data, uint8 latch_data){
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shift_data_out(data, latch_data, SHIFT_LATCH);
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shift_clear();
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}
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/*!
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* Setzt die Shift-Register wieder zurück
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*/
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void shift_clear(){
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SHIFT_PORT &= ~SHIFT_OUT; // und wieder clear
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}
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#endif
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#endif
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