128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/*
|
|
* =====================================================================================
|
|
*
|
|
* ________ .__ __ ________ ____ ________
|
|
* \_____ \ __ __|__| ____ | | __\______ \ _______ _/_ |/ _____/
|
|
* / / \ \| | \ |/ ___\| |/ / | | \_/ __ \ \/ /| / __ \
|
|
* / \_/. \ | / \ \___| < | ` \ ___/\ / | \ |__\ \
|
|
* \_____\ \_/____/|__|\___ >__|_ \/_______ /\___ >\_/ |___|\_____ /
|
|
* \__> \/ \/ \/ \/ \/
|
|
*
|
|
* www.optixx.org
|
|
*
|
|
*
|
|
* Version: 1.0
|
|
* Created: 07/21/2009 03:32:16 PM
|
|
* Author: david@optixx.org
|
|
*
|
|
* =====================================================================================
|
|
*/
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <avr/io.h>
|
|
#include <util/delay.h> /* for _delay_ms() */
|
|
#include <avr/interrupt.h>
|
|
|
|
|
|
#include "config.h"
|
|
#include "sram.h"
|
|
#include "system.h"
|
|
#include "uart.h"
|
|
#include "debug.h"
|
|
#include "info.h"
|
|
#include "requests.h"
|
|
#include "irq.h"
|
|
|
|
|
|
|
|
typedef struct system_t {
|
|
enum bus_mode_e { MODE_AVR, MODE_SNES } bus_mode;
|
|
enum rom_mode_e { LOROM, HOROM } rom_mode;
|
|
enum reset_line_e { RESET_OFF, RESET_ON } reset_line;
|
|
enum irq_line_e { IRQ_ON, IRQ_OFF } irq_line;
|
|
enum wr_line_e { WR_DISABLE, WR_ENABLE } wr_line;
|
|
|
|
uint8_t reset_count;
|
|
} system_t;
|
|
|
|
system_t system;
|
|
|
|
void system_init(void)
|
|
{
|
|
snes_reset_hi();
|
|
snes_reset_off();
|
|
system.reset_line = RESET_OFF;
|
|
|
|
snes_irq_hi();
|
|
snes_irq_off();
|
|
system.irq_line = IRQ_OFF;
|
|
|
|
system.reset_count = 0;
|
|
|
|
snes_wr_disable();
|
|
system.wr_line = WR_DISABLE;
|
|
|
|
avr_bus_active();
|
|
system.bus_mode = MODE_AVR;
|
|
|
|
|
|
}
|
|
|
|
void system_reset()
|
|
{
|
|
info_P(PSTR("Reset SNES\n"));
|
|
cli();
|
|
snes_reset_on();
|
|
snes_reset_lo();
|
|
_delay_ms(2);
|
|
snes_reset_hi();
|
|
snes_reset_off();
|
|
sei();
|
|
system.reset_count++;
|
|
}
|
|
|
|
void system_send_irq()
|
|
{
|
|
snes_irq_on();
|
|
snes_irq_lo();
|
|
_delay_us(20);
|
|
snes_irq_hi();
|
|
snes_irq_off();
|
|
}
|
|
|
|
void system_bus_avr()
|
|
{
|
|
avr_bus_active();
|
|
info_P(PSTR("Activate AVR bus\n"));
|
|
system.bus_mode = MODE_AVR;
|
|
snes_wr_disable();
|
|
system.wr_line = WR_DISABLE;
|
|
info_P(PSTR("Disable SNES WR\n"));
|
|
}
|
|
|
|
void system_bus_snes()
|
|
{
|
|
snes_wr_disable();
|
|
system.wr_line = WR_DISABLE;
|
|
info_P(PSTR("Disable SNES WR\n"));
|
|
snes_bus_active();
|
|
system.bus_mode = MODE_SNES;
|
|
info_P(PSTR("Activate SNES bus\n"));
|
|
irq_stop();
|
|
|
|
}
|
|
|
|
void system_rom_mode(usb_transaction_t *usb_trans)
|
|
{
|
|
if (usb_trans->req_bank_size == 0x8000) {
|
|
snes_lorom();
|
|
info_P(PSTR("Set SNES lowrom \n"));
|
|
} else {
|
|
snes_hirom();
|
|
info_P(PSTR("Set SNES hirom \n"));
|
|
}
|
|
}
|
|
|