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Revert "Revert "Started PSG emulator""
This reverts commit 59033eb.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| //represents a PSG: AY-3-8910 or YM2149 | ||
| //register data: https://f.rdw.se/AY-3-8910-datasheet.pdf | ||
| //BC1 and BDIR coming from one VIA port | ||
| //Data on the other VIA port | ||
| //Starting with basic tones, only writing to PSGs. Reading from PSG I/O not supported. | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
| using System.Threading; | ||
|
|
||
| namespace Emul816or | ||
| { | ||
| public class PSG | ||
| { | ||
| const uint size = 16; | ||
| const uint baseAddress = 0x100000; | ||
| private bool supports16bit = true; | ||
| //private bool bdir; | ||
| //private bool bc1; | ||
| //assuming bc2 is tied high | ||
| private byte currentRegister; //0x00-0x0F | ||
| //private byte incomingData; //hold incoming data prior to receiving appropriate bus control signals | ||
| //private byte outgoingData; //hold outgoing data prior to receiving appropriate bus control signals | ||
| private byte tempData; | ||
|
|
||
| byte[] RegisterValues; | ||
| Thread thread_PSG1_ChA; | ||
|
|
||
| public enum REGISTERS | ||
| { | ||
| Reg0_ChA_TonePeriod_Fine, | ||
| Reg1_ChA_TonePeriod_Course, | ||
| Reg2_ChB_TonePeriod_Fine, | ||
| Reg3_ChB_TonePeriod_Course, | ||
| Reg4_ChC_TonePeriod_Fine, | ||
| Reg5_ChC_TonePeriod_Course, | ||
| Reg6_NoisePeriod, | ||
| Reg7_EnableB, | ||
| Reg8_ChA_Amplitude, | ||
| Reg9_ChB_Amplitude, | ||
| RegA_ChC_Amplitude, | ||
| RegB_EnvelopePeriod_Fine, | ||
| RegC_EnvelopePeriod_Course, | ||
| RegD_EnvelopeShapeCycle, | ||
| RegE_IO_PortA_Data, | ||
| RegF_IO_PortB_Data | ||
| } | ||
| public uint Size | ||
| { | ||
| get => size; | ||
| } | ||
| public uint BaseAddress | ||
| { | ||
| get => baseAddress; | ||
| } | ||
| public void SetBusControl(bool BDIR, bool BC1) | ||
| { | ||
| //this.bdir = BDIR; | ||
| //this.bc1 = BC1; | ||
|
|
||
| //setreg = NACT -> writeValue -> INTAK -> NACT | ||
| //readdata = NACT -> changeDDRtoRead(00) -> writeZero -> DTB -> changeDDRtoWrite(FF) -> NACT | ||
| //writedata = NACT -> writeValue -> DWS -> NACT | ||
| if (!BDIR && !BC1) //inactive (NACT) | ||
| { | ||
| tempData = 0; | ||
| } | ||
| else if (!BDIR && BC1) //read (DTB) | ||
| { | ||
| //readdata | ||
| //not supported yet | ||
| tempData= RegisterValues[currentRegister]; | ||
| } | ||
| else if (BDIR && !BC1) //write (DWS) | ||
| { | ||
| //writedata | ||
| RegisterValues[currentRegister] = tempData; | ||
| Play(); | ||
| } | ||
| else if (BDIR && BC1) //latch (INTAK) | ||
| { | ||
| //setreg | ||
| if (tempData >= 0 && tempData <= 15) | ||
| { | ||
| currentRegister = tempData; | ||
| } | ||
| } | ||
| } | ||
| public Byte Value | ||
| { | ||
| get | ||
| { | ||
| return tempData; | ||
| } | ||
| set | ||
| { | ||
| tempData = value; | ||
| } | ||
| } | ||
| public bool Supports16Bit | ||
| { | ||
| get => supports16bit; | ||
| } | ||
|
|
||
| public PSG() | ||
| { | ||
| RegisterValues = new byte[16]; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg0_ChA_TonePeriod_Fine] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg1_ChA_TonePeriod_Course] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg2_ChB_TonePeriod_Fine] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg3_ChB_TonePeriod_Course] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg4_ChC_TonePeriod_Fine] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg5_ChC_TonePeriod_Course] = 0; | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg6_NoisePeriod] = 0; //not implementing yet | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg7_EnableB] = 0b11111111; //turn off noise and tone | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg8_ChA_Amplitude] = 15; //max volume | ||
| RegisterValues[(byte)PSG.REGISTERS.Reg9_ChB_Amplitude] = 15; //max volume | ||
| RegisterValues[(byte)PSG.REGISTERS.RegA_ChC_Amplitude] = 15; //max volume | ||
| RegisterValues[(byte)PSG.REGISTERS.RegB_EnvelopePeriod_Fine] = 0; //not implementing yet | ||
| RegisterValues[(byte)PSG.REGISTERS.RegC_EnvelopePeriod_Course] = 0; //not implementing yet | ||
| RegisterValues[(byte)PSG.REGISTERS.RegD_EnvelopeShapeCycle] = 0; //not implementing yet | ||
| RegisterValues[(byte)PSG.REGISTERS.RegE_IO_PortA_Data] = 0; //not implementing yet | ||
| RegisterValues[(byte)PSG.REGISTERS.RegF_IO_PortB_Data] = 0; //not implementing yet | ||
| } | ||
|
|
||
| private void Play() | ||
| { | ||
| //read all registers and update sound output of PSG | ||
| bool chAenable = !(Convert.ToBoolean(RegisterValues[(int)REGISTERS.Reg7_EnableB] & (byte)0x00000001)); | ||
| if (chAenable) | ||
| { | ||
| int frequency = RegisterValues[(int)REGISTERS.Reg1_ChA_TonePeriod_Course]; | ||
| //TO DO - Frequency calc based on Course and Fine | ||
| PSG p = new PSG(); | ||
| thread_PSG1_ChA = new Thread(PSG.PlayTone); | ||
| thread_PSG1_ChA.Start(1000); //frequency | ||
| } | ||
| else | ||
| { | ||
| //turn off sound | ||
| if(thread_PSG1_ChA != null) | ||
| { | ||
| thread_PSG1_ChA.Interrupt(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public static void PlayTone(object data) | ||
| { | ||
| UInt16 i = (UInt16)((int)data & 0b0111111111111111); | ||
| //testing with Beep for now | ||
| //need to find a better way to play a tone, as multiple, simultaneous tones will be needed | ||
| Console.Beep(i,int.MaxValue-1); | ||
| } | ||
| } | ||
| } |
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