149 lines
3.0 KiB
C
149 lines
3.0 KiB
C
/*
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* =====================================================================================
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*
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* ________ .__ __ ________ ____ ________
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* \_____ \ __ __|__| ____ | | __\______ \ _______ _/_ |/ _____/
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* / / \ \| | \ |/ ___\| |/ / | | \_/ __ \ \/ /| / __ \
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* / \_/. \ | / \ \___| < | ` \ ___/\ / | \ |__\ \
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* \_____\ \_/____/|__|\___ >__|_ \/_______ /\___ >\_/ |___|\_____ /
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* \__> \/ \/ \/ \/ \/
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*
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* www.optixx.org
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*
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*
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* Version: 1.0
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* Created: 07/21/2009 03:32:16 PM
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* Author: david@optixx.org
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*
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* =====================================================================================
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <util/delay.h> /* for _delay_ms() */
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#include <avr/interrupt.h>
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#include "config.h"
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#include "sram.h"
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#include "system.h"
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#include "uart.h"
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#include "debug.h"
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#include "info.h"
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#include "requests.h"
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#include "irq.h"
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system_t system;
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void system_init(void)
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{
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snes_reset_hi();
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snes_reset_off();
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system.reset_line = RESET_OFF;
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snes_irq_hi();
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snes_irq_off();
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system.irq_line = IRQ_OFF;
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snes_wr_disable();
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system.wr_line = WR_DISABLE;
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avr_bus_active();
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system.bus_mode = MODE_AVR;
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snes_lorom();
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system.rom_mode = LOROM;
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system.snes_reset_count = 0;
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system.avr_reset_count = 0;
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system.reset_irq = RESET_IRQ_OFF;
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}
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void system_send_snes_reset()
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{
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info_P(PSTR("Reset SNES\n"));
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cli();
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snes_reset_on();
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snes_reset_lo();
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_delay_ms(2);
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snes_reset_hi();
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snes_reset_off();
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sei();
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system.snes_reset_count++;
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}
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void system_send_snes_irq()
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{
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snes_irq_on();
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snes_irq_lo();
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_delay_us(20);
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snes_irq_hi();
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snes_irq_off();
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}
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void system_snes_irq_off()
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{
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snes_irq_off();
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system.irq_line = IRQ_OFF;
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}
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void system_snes_irq_on()
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{
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snes_irq_on();
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system.irq_line = IRQ_ON;
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}
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void system_set_bus_avr()
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{
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avr_bus_active();
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info_P(PSTR("Activate AVR bus\n"));
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system.bus_mode = MODE_AVR;
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snes_wr_disable();
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system.wr_line = WR_DISABLE;
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info_P(PSTR("Disable SNES WR\n"));
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}
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void system_set_bus_snes()
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{
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snes_wr_disable();
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system.wr_line = WR_DISABLE;
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info_P(PSTR("Disable SNES WR\n"));
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snes_bus_active();
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system.bus_mode = MODE_SNES;
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info_P(PSTR("Activate SNES bus\n"));
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}
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void system_set_rom_mode(usb_transaction_t *usb_trans)
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{
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if (usb_trans->req_bank_size == 0x8000) {
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snes_lorom();
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system.rom_mode = LOROM;
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info_P(PSTR("Set SNES lorom \n"));
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} else {
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snes_hirom();
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system.rom_mode = HIROM;
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info_P(PSTR("Set SNES hirom \n"));
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}
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}
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void system_set_rom_lorom()
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{
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snes_lorom();
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system.rom_mode = LOROM;
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info_P(PSTR("Set SNES lorom \n"));
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}
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void system_set_rom_hirom()
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{
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snes_hirom();
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system.rom_mode = HIROM;
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info_P(PSTR("Set SNES hirom \n"));
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}
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