mirror of https://github.com/bsnes-emu/bsnes.git
87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
auto ICD2::lcdScanline() -> void {
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if(GameBoy::ppu.status.ly > 143) return; //Vblank
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if((GameBoy::ppu.status.ly & 7) == 0) {
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writeBank = (writeBank + 1) & 3;
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writeAddress = 0;
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}
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}
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auto ICD2::lcdOutput(uint2 color) -> void {
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uint y = writeAddress / 160;
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uint x = writeAddress % 160;
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uint addr = writeBank * 512 + y * 2 + x / 8 * 16;
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output[addr + 0] = (output[addr + 0] << 1) | (bool)(color & 1);
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output[addr + 1] = (output[addr + 1] << 1) | (bool)(color & 2);
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writeAddress = (writeAddress + 1) % 1280;
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}
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auto ICD2::joypWrite(bool p15, bool p14) -> void {
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//joypad handling
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if(p15 == 1 && p14 == 1) {
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if(joyp15Lock == 0 && joyp14Lock == 0) {
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joyp15Lock = 1;
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joyp14Lock = 1;
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joypID = (joypID + 1) & 3;
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}
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}
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if(p15 == 0 && p14 == 1) joyp15Lock = 0;
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if(p15 == 1 && p14 == 0) joyp14Lock = 0;
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//packet handling
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if(p15 == 0 && p14 == 0) { //pulse
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pulseLock = false;
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packetOffset = 0;
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bitOffset = 0;
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strobeLock = true;
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packetLock = false;
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return;
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}
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if(pulseLock) return;
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if(p15 == 1 && p14 == 1) {
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strobeLock = false;
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return;
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}
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if(strobeLock) {
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if(p15 == 1 || p14 == 1) { //malformed packet
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packetLock = false;
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pulseLock = true;
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bitOffset = 0;
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packetOffset = 0;
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} else {
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return;
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}
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}
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//p15:1, p14:0 = 0
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//p15:0, p14:1 = 1
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bool bit = (p15 == 0);
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strobeLock = true;
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if(packetLock) {
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if(p15 == 1 && p14 == 0) {
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if((joypPacket[0] >> 3) == 0x11) {
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mltReq = joypPacket[1] & 3;
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if(mltReq == 2) mltReq = 3;
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joypID = 0;
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}
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if(packetSize < 64) packet[packetSize++] = joypPacket;
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packetLock = false;
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pulseLock = true;
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}
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return;
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}
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bitData = (bit << 7) | (bitData >> 1);
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if(++bitOffset < 8) return;
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bitOffset = 0;
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joypPacket[packetOffset] = bitData;
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if(++packetOffset < 16) return;
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packetLock = true;
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}
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