borgware-2d/borg_hw/borg_hw_ancient.c

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#include <avr/interrupt.h>
#include <avr/io.h>
#undef WATCHDOG_ENABLED
#ifdef WATCHDOG_ENABLED
# include <avr/wdt.h>
#endif
#include "../config.h"
#include "../makros.h"
#include "borg_hw.h"
// define row port
#ifndef ROWPORT
# define ROWPORT PORTA
#endif
#define ROWDDR DDR(ROWPORT)
// define column port
#ifndef COLPORT
# define COLPORT PORTC
#endif
#define COLDDR DDR(COLPORT)
// buffer which holds the currently shown frame
unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES];
ISR(TIMER0_COMP_vect)
{
static unsigned char plane = 0;
static unsigned char row = 0;
#ifdef WATCHDOG_ENABLED
// reset watchdog
wdt_reset();
#endif
ROWPORT = 0;
row++;
if ((COLPORT <<= 1) == 0) {
row = 0;
COLPORT = 1;
if (++plane == NUMPLANE)
{
plane = 0;
}
}
for (unsigned char x = 0; x < 10; x++) {
asm volatile ("nop");
}
ROWPORT = pixmap[plane][row][0];
}
void timer0_off(){
cli();
COLPORT = 0;
ROWPORT = 0;
#if defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644__)
TCCR0A = 0x00;
TCCR0B = 0x00;
TIMSK0 = 0;
#else
TCCR0 = 0x00;
TIMSK = 0;
#endif
sei();
}
static void timer0_on(){
/* TCCR0: FOC0 WGM00 COM01 COM00 WGM01 CS02 CS01 CS00
CS02 CS01 CS00
0 0 0 stop
0 0 1 clk
0 1 0 clk/8
0 1 1 clk/64
1 0 0 clk/256
1 0 1 clk/1024
*/
#if defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644__)
TCCR0A = 0x02; // CTC Mode
TCCR0B = 0x03; // clk/64
TCNT0 = 0x00; // reset timer
OCR0 = 0x0A; // compare with this value
TIMSK0 = 0x02; // compare match Interrupt on
#else
TCCR0 = 0x0B; // CTC Mode, clk/64
TCNT0 = 0x00; // reset timer
OCR0 = 0x0A; // compare with this value
TIMSK = 0x02; // compare match Interrupt on
#endif
}
void borg_hw_init(){
// switch all pins of both the row and the column port to output mode
ROWDDR = 0xFF;
COLDDR = 0xFF;
// switch off all rows and columns for now
COLPORT = 0;
ROWPORT = 0;
timer0_on();
#ifdef WATCHDOG_ENABLED
// activate watchdog timer
wdt_reset();
wdt_enable(0x00); // 17ms watchdog
#endif
}