154 lines
2.9 KiB
C
154 lines
2.9 KiB
C
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#include "../config.h"
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#include "../makros.h"
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <avr/wdt.h>
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#include "borg_hw.h"
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#define PIN_DATA PB4
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#define PIN_CLK PB3
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#define PIN_STR PB2
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//Der Puffer, in dem das aktuelle Bild gespeichert wird
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unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES];
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//zur n<>chsten Zeile weiterschalten
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inline void nextrow(uint8_t row){
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//Die Zust<73>nde von der vorherigen Zeile l<>schen
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PORTC &= 0xF0;
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PORTD &= 0x0F;
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PORTB &= 0xFC;
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//kurze Warteschleife, damit die Treiber auch wirklich ausschalten
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unsigned char i;
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for(i=0;i<10;i++){
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asm volatile("nop");
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}
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if (row == 0){
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//Zeile 0: Das erste Schieberegister initialisieren
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PORTB &= ~(1<<PIN_DATA); // zeile ist aktiv auf low
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PORTB |= (1<<PIN_CLK);
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PORTB &= ~(1<<PIN_CLK);
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PORTB |= (1<<PIN_DATA);
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}
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else {
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//In jeder anderen Zeile einfach nur einen weiter schieben
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PORTB |= (1<<PIN_CLK);
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PORTB &= ~(1<<PIN_CLK);
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}
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//noch eine Warteschleife, damit die Zeilentreiber bereit sind
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for(i=0;i<20;i++){
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asm volatile("nop");
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}
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}
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//Eine Zeile anzeigen
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inline void rowshow(unsigned char row, unsigned char plane){
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//Je nachdem, welche der Ebenen wir Zeichnen, die Zeile verschieden lange Anzeigen
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switch (plane){
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case 0:
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TCNT0 = 0x100-12;
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break;
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case 1:
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TCNT0 = 0x100-20;
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break;
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case 2:
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TCNT0 = 0x100-50;
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}
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uint8_t tmp, tmp1;
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//die Daten f<>r die aktuelle Zeile auf die Spaltentreiber ausgeben
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tmp = pixmap[plane][row][0];
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tmp1 = pixmap[plane][row][1];
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PORTC = ( PORTC & 0xF0 ) | (tmp & 0x0F);
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PORTD = ( PORTD & 0x0F ) | (tmp & 0xF0);
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PORTB = ( PORTB & 0xFC ) | (tmp1 & 0x03);
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}
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//Dieser Interrupt wird je nach Ebene mit 50kHz 31,25kHz oder 12,5kHz ausgef<65>hrt
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SIGNAL(SIG_OVERFLOW0)
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{
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static unsigned char plane = 0;
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static unsigned char row = 0;
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//Watchdog zur<75>cksetzen
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wdt_reset();
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//Zeile und Ebene inkrementieren
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if(++plane==NUMPLANE){
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plane=0;
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if(++row == NUM_ROWS){
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row = 0;
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}
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nextrow(row);
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}
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//Die aktuelle Zeile in der aktuellen Ebene ausgeben
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rowshow(row, plane);
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}
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void timer0_off(){
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cli();
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/*
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COLPORT1 = 0;
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COLPORT2 = 0;
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ROWPORT = 0;
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*/
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TCCR0 = 0x00;
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sei();
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}
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// Den Timer, der denn Interrupt ausl<73>st, initialisieren
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void timer0_on(){
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/* TCCR0: FOC0 WGM00 COM01 COM00 WGM01 CS02 CS01 CS00
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CS02 CS01 CS00
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0 0 0 stop
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0 0 1 clk
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0 1 0 clk/8
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0 1 1 clk/64
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1 0 0 clk/256
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1 0 1 clk/1024
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*/
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TCCR0 = 0x03; // clk/64
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TCNT0 = 0xFF-20; // reset timer
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TIMSK |= (1<<TOIE0); // Compare match Interrupt on
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}
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void borg_hw_init(){
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// N<>tige Pins auf Ausgang
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DDRC=0x0F; // PC0-3 - Row 0-3
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DDRD=0xF0; // PCD-7 - Row 4-7
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DDRB=0x1F; // PB0-1 - Row 8-9 PB2-3 - STR, CLK, d
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// Alle Spalten erstmal aus, clk aus, d und str an
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PORTC &= 0xF0;
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PORTD &= 0x0F;
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PORTB = ( PORTB & 0xE0 ) | 0x14;
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timer0_on();
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//Watchdog Timer aktivieren
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wdt_reset();
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wdt_enable(0x00); // 17ms Watchdog
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}
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