184 lines
4.7 KiB
C
184 lines
4.7 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 mouse.c
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* @brief Routinen fuer die Ansteuerung eines opt. Maussensors
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* @author Benjamin Benz (bbe@heise.de)
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* @date 26.12.05
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*/
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#include "global.h"
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#ifdef MCU
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#include <avr/io.h>
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#include "ct-Bot.h"
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#include "mouse.h"
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#include "delay.h"
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#include "ena.h"
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#ifdef MAUS_AVAILABLE
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#define MAUS_DDR DDRB /*!< DDR fuer Maus-SCLK */
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#define MAUS_PORT PORTB /*!< PORT fuer Maus-SCLK */
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#define MAUS_SCK_PIN (1<<7) /*!< PIN fuer Maus-SCLK */
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#define MAUS_SDA_NR 6 /*!< Pin an dem die SDA-Leitung haengt */
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#define MAUS_SDA_PINR PINB /*!< Leseregister */
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#define MAUS_SDA_PIN (1<<MAUS_SDA_NR) /*!< Bit-Wert der SDA-Leitung */
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#define MOUSE_Enable() ENA_on(ENA_MOUSE_SENSOR)
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/*!
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* Uebertraegt ein Byte an den Sensor
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* @param data das Byte
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*/
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void maus_sens_writeByte(uint8 data){
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int8 i;
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MAUS_DDR |= MAUS_SDA_PIN; // SDA auf Output
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for (i=7; i>=0; i--){
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MAUS_PORT &= ~MAUS_SCK_PIN; // SCK auf Low, vorbereiten
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//Daten rausschreiben
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MAUS_PORT = (MAUS_PORT & (~MAUS_SDA_PINR)) | ((data >> (7 - MAUS_SDA_NR)) & MAUS_SDA_PIN);
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data = data <<1; // naechstes Bit vorbereiten
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asm volatile("nop"); // Etwas warten
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MAUS_PORT |= MAUS_SCK_PIN; // SCK =1 Sensor uebernimmt auf steigender Flanke
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}
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}
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/*!
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* Liest ein Byte vom Sensor
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* @return das Byte
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*/
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uint8 maus_sens_readByte(void){
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int i;
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char data=0;
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MAUS_DDR &= ~MAUS_SDA_PIN; // SDA auf Input
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for (i=7; i>-1; i--){
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MAUS_PORT &= ~MAUS_SCK_PIN; // SCK =0 Sensor bereitet Daten auf fallender Flanke vor !
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data=data<<1; // Platz schaffen
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asm volatile("nop"); // Etwas warten
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MAUS_PORT |= MAUS_SCK_PIN; // SCK =1 Daten lesen auf steigender Flanke
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data |= (MAUS_SDA_PINR >> MAUS_SDA_NR) & 0x01; //Daten lesen
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}
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return data;
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}
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/*!
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* Uebertraegt ein write-Kommando an den Sensor
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* @param adr Adresse
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* @param data Datum
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*/
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void maus_sens_write(int8 adr, uint8 data){
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int16 i;
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MOUSE_Enable();
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maus_sens_writeByte(adr|=0x80); //rl MSB muss 1 sein Datenblatt S.12 Write Operation
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maus_sens_writeByte(data);
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for (i=0; i<300; i++){ asm volatile("nop"); } // mindestens 100 Mikrosekunden Pause!!!
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}
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/*!
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* Schickt ein Lesekommando an den Sensor
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* und liest ein Byte zurueck
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* @param adr die Adresse
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* @return das Datum
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*/
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uint8 maus_sens_read(uint8 adr){
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MOUSE_Enable();
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int16 i;
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maus_sens_writeByte(adr);
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for (i=0; i<300; i++){asm volatile("nop");} // mindestens 100 Mikrosekunden Pause!!!
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return maus_sens_readByte();
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}
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/*!
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* Initialisiere Maussensor
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*/
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void maus_sens_init(void){
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delay(100);
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MAUS_DDR |= MAUS_SCK_PIN; // SCK auf Output
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MAUS_PORT &= ~MAUS_SCK_PIN; // SCK auf 0
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delay(10);
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maus_sens_write(MOUSE_CONFIG_REG,MOUSE_CFG_RESET); //Reset sensor
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maus_sens_write(MOUSE_CONFIG_REG,MOUSE_CFG_FORCEAWAKE); //Always on
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}
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/*! muessen wir nach dem ersten Pixel suchen?*/
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static uint8 firstRead;
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/*!
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* Bereitet das auslesen eines ganzen Bildes vor
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*/
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void maus_image_prepare(void){
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maus_sens_write(MOUSE_CONFIG_REG,MOUSE_CFG_FORCEAWAKE); //Always on
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maus_sens_write(MOUSE_PIXEL_DATA_REG,0x00); // Frame grabben anstossen
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firstRead=1; //suche erstes Pixel
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}
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/*!
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* Liefert bei jedem Aufruf das naechste Pixel des Bildes
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* Insgesamt gibt es 324 Pixel
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* <pre>
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* 18 36 ... 324
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* .. .. ... ..
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* 2 20 ... ..
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* 1 19 ... 307
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* </pre>
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* Bevor diese Funktion aufgerufen wird, muss maus_image_prepare() aufgerufen werden!
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* @return Die Pixeldaten (Bit 0 bis Bit5), Pruefbit, ob Daten gueltig (Bit6), Markierung fuer den Anfang eines Frames (Bit7)
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*/
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int8 maus_image_read(void){
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int8 pixel=maus_sens_read(MOUSE_PIXEL_DATA_REG);
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if ( firstRead ==1){
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while ( (pixel & 0x80) != 0x80){
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pixel=maus_sens_read(MOUSE_PIXEL_DATA_REG);
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// if ((pixel & 0x70) != 0x70)
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// return 0;
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}
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firstRead=0;
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}
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return pixel;
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}
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/*!
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* Gibt den SQUAL-Wert zurueck. Dieser gibt an, wieviele Merkmale der Sensor
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* im aktuell aufgenommenen Bild des Untergrunds wahrnimmt
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*/
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uint8 maus_get_squal(void) {
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return maus_sens_read(MOUSE_SQUAL_REG);
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}
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#endif
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#endif
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