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109 lines
3 KiB
C
109 lines
3 KiB
C
//
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// si/pak_transfer.c: Controller pak routines
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2016, Mike Ryan.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "pak.h"
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#include "gb.h"
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static void gameboy_read(struct controller *controller, uint16_t address,
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uint8_t *buffer);
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static void gameboy_write(struct controller *controller, uint16_t address,
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uint8_t *buffer);
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void transfer_pak_read(struct controller *controller,
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uint8_t *send_buf, uint8_t send_bytes,
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uint8_t *recv_buf, uint8_t recv_bytes) {
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uint16_t address = send_buf[1] << 8 | send_buf[2];
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address &= ~0x1F; // lower 5 bits are address CRC
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// printf("read from %04x\n", address);
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// get enable/disable state
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if (address == 0x8000)
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memset(recv_buf, controller->pak_enabled ? 0x84 : 0x00, 0x20);
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// get insertion status and access mode
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else if (address == 0xB000) {
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if (controller->pak_enabled) {
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// cart inserted, return mode and mode changed
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if (controller->tpak_rom.ptr != NULL) {
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memset(recv_buf, controller->tpak_mode == 1 ? 0x89 : 0x80, 0x20);
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recv_buf[0] |= controller->tpak_mode_changed ? 0x4 : 0;
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}
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// cart not inserted
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else
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memset(recv_buf, 0x40, 0x20);
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controller->tpak_mode_changed = 0;
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}
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}
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// read from GB cart
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else if (address >= 0xC000) {
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if (controller->pak_enabled) {
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uint16_t gb_addr = address - 0xC000
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+ (controller->tpak_bank & 3) * 0x4000;
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gameboy_read(controller, gb_addr, recv_buf);
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}
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}
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}
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void transfer_pak_write(struct controller *controller,
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uint8_t *send_buf, uint8_t send_bytes,
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uint8_t *recv_buf, uint8_t recv_bytes) {
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uint16_t address = send_buf[1] << 8 | send_buf[2];
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address &= ~0x1F; // lower 5 bits are address CRC
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// printf("write to %04x\n", address);
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// set bank
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if (address == 0xA000) {
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if (controller->pak_enabled)
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controller->tpak_bank = send_buf[3];
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}
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// set access mode
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else if (address == 0xB000) {
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if (controller->pak_enabled) {
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controller->tpak_mode = send_buf[3] & 1;
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controller->tpak_mode_changed = 1;
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}
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}
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// write to GB cart
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else if (address >= 0xC000) {
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uint16_t gb_addr = address - 0xC000
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+ (controller->tpak_bank & 3) * 0x4000;
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gameboy_write(controller, gb_addr, send_buf + 3);
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}
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}
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// read 0x20 bytes from Game Boy cart at address
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void gameboy_read(struct controller *controller, uint16_t address,
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uint8_t *buffer) {
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for(int i=0;i<0x20;i++)
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buffer[i] = gb_read(controller, address+i);
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// printf("read: %04X: ", address);
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// for(int i=0;i<32;i++) {
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// if(i==16) printf("\n ");
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// printf("%02X ", buffer[i]);
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// }
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// printf("\n");
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}
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// write 0x20 bytes from buffer to Game Boy cart at address
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void gameboy_write(struct controller *controller, uint16_t address,
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uint8_t *buffer) {
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for(int i=0;i<0x20;i++)
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gb_write(controller, address+i, buffer[i]);
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// printf("write: %04X:%02X\n", address, buffer[0]);
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}
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