Saturn: initial support. (#612)
This commit is contained in:
Sergey Dvodnenko
GitHub
231
support/saturn/saturn.cpp
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231
support/saturn/saturn.cpp
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "../../file_io.h"
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#include "../../user_io.h"
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#include "../../spi.h"
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#include "../../hardware.h"
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#include "../../menu.h"
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#include "../../cheats.h"
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#include "saturn.h"
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static int need_reset = 0;
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uint32_t frame_cnt = 0;
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static uint32_t CalcTimerOffset(uint8_t speed) {
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static uint8_t adj = 0x1;
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uint32_t offs;
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if (speed == 2) {
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offs = 6 + ((adj & 0x03) != 0x00 ? 1 : 0); //6.6
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adj <<= 1;
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if (adj >= 0x08) adj = 0x01;
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}
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else if (speed == 1) {
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offs = 13 + ((adj & 0x01) != 0x00 ? 1 : 0); //13.3
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adj <<= 1;
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if (adj >= 0x08) adj = 0x01;
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}
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else {
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offs = 16 + ((adj & 0x03) != 0x00 ? 1 : 0); //16.7
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adj <<= 1;
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if (adj >= 0x08) adj = 0x01;
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}
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return offs;
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}
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void saturn_poll()
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{
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static unsigned long poll_timer = 0;
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static uint8_t last_req = 255;
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if (!poll_timer || CheckTimer(poll_timer))
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{
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poll_timer = GetTimer(0);
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uint16_t data_in[6];
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uint8_t req = spi_uio_cmd_cont(UIO_CD_GET);
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if (req != last_req)
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{
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last_req = req;
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for (int i = 0; i < 6; i++) data_in[i] = spi_w(0);
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DisableIO();
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satcdd.SetCommand((uint8_t*)data_in);
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satcdd.CommandExec();
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}
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else
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DisableIO();
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uint8_t time_mode;
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satcdd.Process(&time_mode);
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poll_timer += CalcTimerOffset(time_mode);
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uint16_t* s = (uint16_t*)satcdd.GetStatus();
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spi_uio_cmd_cont(UIO_CD_SET);
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for (int i = 0; i < 6; i++) spi_w(s[i]);
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DisableIO();
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satcdd.Update();
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frame_cnt++;
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}
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}
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static char buf[1024];
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static void saturn_mount_save(const char *filename)
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{
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/*user_io_set_index(SAVE_IO_INDEX);
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user_io_set_download(1);
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if (strlen(filename))
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{
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FileGenerateSavePath(filename, buf);
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user_io_file_mount(buf, 0, 1);
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}
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else
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{
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user_io_file_mount("");
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}
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user_io_set_download(0);*/
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}
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static int saturn_load_rom(const char *basename, const char *name, int sub_index)
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{
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strcpy(buf, basename);
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char *p = strrchr(buf, '/');
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if (p)
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{
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p++;
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strcpy(p, name);
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if (user_io_file_tx(buf, sub_index << 6)) return 1;
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}
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return 0;
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}
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void saturn_set_image(int num, const char *filename)
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{
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static char last_dir[1024] = {};
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(void)num;
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satcdd.Unload();
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satcdd.state = Open;
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int same_game = *filename && *last_dir && !strncmp(last_dir, filename, strlen(last_dir));
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strcpy(last_dir, filename);
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char *p = strrchr(last_dir, '/');
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if (p) *p = 0;
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int loaded = 1;
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if (!same_game)
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{
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saturn_mount_save("");
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user_io_status_set("[0]", 1);
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user_io_status_set("[0]", 0);
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saturn_reset();
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loaded = 0;
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strcpy(buf, last_dir);
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char *p = strrchr(buf, '/');
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if (p)
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{
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strcpy(p + 1, "cd_bios.rom");
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loaded = user_io_file_tx(buf);
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}
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if (!loaded)
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{
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sprintf(buf, "%s/boot.rom", HomeDir());
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loaded = user_io_file_tx(buf);
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}
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if (!loaded) Info("CD BIOS not found!", 4000);
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}
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if (strlen(filename))
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{
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if (satcdd.Load(filename) > 0)
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{
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satcdd.state = satcdd.loaded ? Stop : Open;
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satcdd.SendData = saturn_send_data;
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if (!same_game)
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{
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saturn_load_rom(filename, "cd_bios.rom", 0);
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//saturn_load_rom(filename, "cart.rom", 1);
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saturn_mount_save(filename);
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//cheats_init(filename, 0);
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}
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}
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else
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{
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satcdd.state = Open;
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}
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}
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}
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void saturn_reset() {
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need_reset = 1;
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}
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int saturn_send_data(uint8_t* buf, int len, uint8_t index) {
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// set index byte
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user_io_set_index(index);
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user_io_set_download(1);
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user_io_file_tx_data(buf, len);
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user_io_set_download(0);
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return 1;
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}
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static char int_blank[] = {
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0x42, 0x61, 0x63, 0x6B, 0x55, 0x70, 0x52, 0x61, 0x6D, 0x20, 0x46, 0x6F, 0x72, 0x6D, 0x61, 0x74,
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0x42, 0x61, 0x63, 0x6B, 0x55, 0x70, 0x52, 0x61, 0x6D, 0x20, 0x46, 0x6F, 0x72, 0x6D, 0x61, 0x74,
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0x42, 0x61, 0x63, 0x6B, 0x55, 0x70, 0x52, 0x61, 0x6D, 0x20, 0x46, 0x6F, 0x72, 0x6D, 0x61, 0x74,
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0x42, 0x61, 0x63, 0x6B, 0x55, 0x70, 0x52, 0x61, 0x6D, 0x20, 0x46, 0x6F, 0x72, 0x6D, 0x61, 0x74,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void saturn_fill_blanksave(uint8_t *buffer, uint32_t lba)
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{
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if (lba == 0)
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{
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memcpy(buffer, int_blank, 512);
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}
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else
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{
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memset(buffer, 0, 512);
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}
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}
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