99 lines
3.2 KiB
Java
99 lines
3.2 KiB
Java
package sega.dreamcast.gdrom;
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import java.misc.Memory;
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import sega.dreamcast.gdrom.GdromCommandPacketFormat;
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public class GdromProtocol {
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static GdromCommandPacketFormat.get_toc get_toc_command;
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static short[] toc_buf;
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static {
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int single_density_area = 0;
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int maximum_toc_length = 0x0198;
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get_toc_command = new GdromCommandPacketFormat.get_toc(single_density_area,
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maximum_toc_length);
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toc_buf = new short[maximum_toc_length >> 1];
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}
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public static void packetCommand(GdromCommandPacketInterface command, boolean enable_dma) {
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while (true) {
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int status = Memory.getU1(Gdrom.status);
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if ((GdromBits.status__bsy(status) | GdromBits.status__drq(status)) == 0)
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break;
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}
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int features = enable_dma ? GdromBits.features__dma__enable : GdromBits.features__dma__disable;
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Memory.putU1(Gdrom.features, features);
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int drive_select = GdromBits.drive_select__drive_select
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| GdromBits.drive_select__lun(0);
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Memory.putU1(Gdrom.drive_select, drive_select);
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Memory.putU1(Gdrom.command, GdromBits.command__code__packet_command);
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System.out.println("words:");
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for (int i = 0; i < 6; i++) {
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int i0 = command.getByte(i * 2);
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int i1 = command.getByte(i * 2 + 1);
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// little endian
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int word = ((i1 & 0xff) << 8) | (i0 & 0xff);
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System.out.println(word);
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Memory.putU2(Gdrom.data, word);
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}
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while (true) {
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int status = Memory.getU1(Gdrom.status);
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if (GdromBits.status__bsy(status) == 0)
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break;
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}
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}
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public static void readData(short[] buf, int length) {
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for (int i = 0; i < (length >> 1); i++) {
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buf[i] = (short)Memory.getU2(Gdrom.data);
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}
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}
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public static int getFad(short[] buf, int i) {
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int low = toc_buf[i * 2] & 0xffff;
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int high = toc_buf[i * 2 + 1] & 0xffff;
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int i0 = (high >> 8) & 0xff;
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int i1 = high & 0xff;
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int i2 = (low >> 8) & 0xff;
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//int i3 = low & 0xff;
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return (i2 << 16) | (i1 << 8) | i0;
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}
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public static int tocGetDataTrackFad() {
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System.out.println("PacketCommand:");
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packetCommand(get_toc_command, false); // PIO mode
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int low = Memory.getU1(Gdrom.byte_count_low);
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int high = Memory.getU1(Gdrom.byte_count_high);
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int byte_count = ((high & 0xff) << 8) | (low & 0xff);
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System.out.print("byte count:");
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System.out.println(byte_count);
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System.out.println("tracks:");
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readData(toc_buf, byte_count);
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for (int i = 0; i < 99; i++) {
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int fad = getFad(toc_buf, i);
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if (fad == 0xffffff)
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break;
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System.out.print("[");
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System.out.print(i);
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System.out.print("] ");
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System.out.println(fad);
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}
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int status = Memory.getU1(Gdrom.status);
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System.out.print("status: ");
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System.out.println(status);
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// assume track 1 is the correct track
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return getFad(toc_buf, 1);
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}
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}
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