add lowlevel tandy dac implementation
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3431
This commit is contained in:
Sebastian Strohhäcker
parent
a4d747c681
commit
704221c89d
3 changed files with 370 additions and 69 deletions
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@ -27,10 +27,10 @@
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#include "setup.h"
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#include "pic.h"
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#include "dma.h"
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#include "hardware.h"
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#include <cstring>
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#include <math.h>
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#define DAC_CLOCK 3570000
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#define MAX_OUTPUT 0x7fff
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#define STEP 0x10000
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@ -56,8 +56,7 @@ Hope that helps the System E stuff, more news on the PSG as and when!
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#define NG_PRESET 0x0f35
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struct SN76496
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{
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struct SN76496 {
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int SampleRate;
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unsigned int UpdateStep;
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int VolTable[16]; /* volume table */
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@ -72,18 +71,36 @@ struct SN76496
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};
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static struct SN76496 sn;
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#define TDAC_DMA_BUFSIZE 1024
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static struct {
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MixerChannel * chan;
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bool enabled;
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Bitu last_write;
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struct {
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bool playing;
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Bitu rate;
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MixerChannel * chan;
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bool enabled;
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struct {
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Bitu base;
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Bit8u irq,dma;
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} hw;
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struct {
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Bitu rate;
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Bit8u buf[TDAC_DMA_BUFSIZE];
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Bit8u last_sample;
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DmaChannel * chan;
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bool transfer_done;
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} dma;
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Bit8u mode,control;
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Bit16u frequency;
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Bit8u amplitude;
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bool irq_activated;
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} dac;
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} tandy;
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static void SN76496Write(Bitu port,Bitu data,Bitu iolen) {
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static void SN76496Write(Bitu /*port*/,Bitu data,Bitu /*iolen*/) {
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struct SN76496 *R = &sn;
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tandy.last_write=PIC_Ticks;
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@ -160,8 +177,7 @@ static void SN76496Write(Bitu port,Bitu data,Bitu iolen) {
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}
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}
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static void SN76496Update(Bitu length)
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{
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static void SN76496Update(Bitu length) {
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if ((tandy.last_write+5000)<PIC_Ticks) {
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tandy.enabled=false;
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tandy.chan->Enable(false);
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@ -250,7 +266,7 @@ static void SN76496Update(Bitu length)
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if (out > MAX_OUTPUT * STEP) out = MAX_OUTPUT * STEP;
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*(buffer++) = out / STEP;
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*(buffer++) = (Bit16s)(out / STEP);
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count--;
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}
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@ -259,11 +275,9 @@ static void SN76496Update(Bitu length)
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static void SN76496_set_clock(int clock)
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{
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static void SN76496_set_clock(int clock) {
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struct SN76496 *R = &sn;
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/* the base clock for the tone generators is the chip clock divided by 16; */
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/* for the noise generator, it is clock / 256. */
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/* Here we calculate the number of steps which happen during one sample */
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@ -274,20 +288,11 @@ static void SN76496_set_clock(int clock)
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}
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static void TandyDACWrite(Bitu port,Bitu data,Bitu iolen) {
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LOG_MSG("Write tandy dac %X val %X",port,data);
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}
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static void SN76496_set_gain(int gain)
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{
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static void SN76496_set_gain(int gain) {
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struct SN76496 *R = &sn;
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int i;
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double out;
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gain &= 0xff;
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/* increase max output basing on gain (0.2 dB per step) */
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@ -308,14 +313,185 @@ static void SN76496_set_gain(int gain)
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}
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bool TS_Get_Address(Bitu& tsaddr, Bitu& tsirq, Bitu& tsdma) {
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tsaddr=0;
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tsirq =0;
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tsdma =0;
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if (tandy.dac.enabled) {
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tsaddr=tandy.dac.hw.base;
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tsirq =tandy.dac.hw.irq;
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tsdma =tandy.dac.hw.dma;
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return true;
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}
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return false;
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}
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static void TandyDAC_DMA_CallBack(DmaChannel * /*chan*/, DMAEvent event) {
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if (event == DMA_REACHED_TC) {
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tandy.dac.dma.transfer_done=true;
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PIC_ActivateIRQ(tandy.dac.hw.irq);
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}
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}
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static void TandyDACModeChanged(void) {
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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break;
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case 2:
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// recording
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break;
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case 3:
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// playback
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tandy.dac.chan->FillUp();
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if (tandy.dac.frequency!=0) {
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float freq=3579545.0f/((float)tandy.dac.frequency);
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tandy.dac.chan->SetFreq((Bitu)freq);
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float vol=((float)tandy.dac.amplitude)/7.0f;
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tandy.dac.chan->SetVolume(vol,vol);
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if ((tandy.dac.mode&0x0c)==0x0c) {
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tandy.dac.dma.transfer_done=false;
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tandy.dac.dma.chan=GetDMAChannel(tandy.dac.hw.dma);
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if (tandy.dac.dma.chan) {
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tandy.dac.dma.chan->Register_Callback(TandyDAC_DMA_CallBack);
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tandy.dac.chan->Enable(true);
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// LOG_MSG("Tandy DAC: playback started with freqency %f, volume %f",freq,vol);
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}
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}
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}
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break;
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}
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}
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static void TandyDACDMAEnabled(void) {
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TandyDACModeChanged();
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}
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static void TandyDACDMADisabled(void) {
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}
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static void TandyDACWrite(Bitu port,Bitu data,Bitu /*iolen*/) {
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switch (port) {
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case 0xc4: {
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Bitu oldmode = tandy.dac.mode;
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tandy.dac.mode = (Bit8u)(data&0xff);
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if ((data&3)!=(oldmode&3)) {
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TandyDACModeChanged();
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}
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if (((data&0x0c)==0x0c) && ((oldmode&0x0c)!=0x0c)) {
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TandyDACDMAEnabled();
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} else if (((data&0x0c)!=0x0c) && ((oldmode&0x0c)==0x0c)) {
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TandyDACDMADisabled();
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}
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}
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break;
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case 0xc5:
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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tandy.dac.control = (Bit8u)(data&0xff);
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break;
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case 2:
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break;
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case 3:
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// direct output
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break;
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}
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break;
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case 0xc6:
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tandy.dac.frequency = tandy.dac.frequency & 0xf00 | (Bit8u)(data&0xff);
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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case 2:
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case 3:
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TandyDACModeChanged();
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break;
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}
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break;
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case 0xc7:
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tandy.dac.frequency = tandy.dac.frequency & 0x00ff | (((Bit8u)(data&0xf))<<8);
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tandy.dac.amplitude = (Bit8u)(data>>5);
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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case 2:
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case 3:
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TandyDACModeChanged();
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break;
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}
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break;
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}
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}
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static Bitu TandyDACRead(Bitu port,Bitu /*iolen*/) {
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switch (port) {
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case 0xc4:
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return (tandy.dac.mode&0x77) | (tandy.dac.irq_activated ? 0x08 : 0x00);
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case 0xc6:
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return (Bit8u)(tandy.dac.frequency&0xff);
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case 0xc7:
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return (Bit8u)(((tandy.dac.frequency>>8)&0xf) | (tandy.dac.amplitude<<5));
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}
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LOG_MSG("Tandy DAC: Read from unknown %X",port);
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return 0xff;
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}
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static void TandyDACGenerateDMASound(Bitu length) {
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if (length) {
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Bitu read=tandy.dac.dma.chan->Read(length,tandy.dac.dma.buf);
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tandy.dac.chan->AddSamples_m8(read,tandy.dac.dma.buf);
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if (read < length) {
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if (read>0) tandy.dac.dma.last_sample=tandy.dac.dma.buf[read-1];
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for (Bitu ct=read; ct < length; ct++) {
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tandy.dac.chan->AddSamples_m8(1,&tandy.dac.dma.last_sample);
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}
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}
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}
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}
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static void TandyDACUpdate(Bitu length) {
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if (tandy.dac.enabled && ((tandy.dac.mode&0x0c)==0x0c)) {
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if (!tandy.dac.dma.transfer_done) {
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Bitu len = length;
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TandyDACGenerateDMASound(len);
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} else {
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for (Bitu ct=0; ct < length; ct++) {
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tandy.dac.chan->AddSamples_m8(1,&tandy.dac.dma.last_sample);
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}
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}
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} else {
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tandy.dac.chan->AddSilence();
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}
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}
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class TANDYSOUND: public Module_base {
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private:
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IO_WriteHandleObject WriteHandler[3];
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IO_WriteHandleObject WriteHandler[4];
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IO_ReadHandleObject ReadHandler[4];
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MixerObject MixerChan;
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MixerObject MixerChanDAC;
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public:
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TANDYSOUND(Section* configuration):Module_base(configuration){
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Section_prop * section=static_cast<Section_prop *>(configuration);
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bool enable_hw_tandy_dac=true;
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Bitu sbport, sbirq, sbdma;
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if (SB_Get_Address(sbport, sbirq, sbdma)) {
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enable_hw_tandy_dac=false;
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}
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real_writeb(0x40,0xd4,0x00);
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if (IS_TANDY_ARCH) {
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/* enable tandy sound if tandy=true/auto */
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@ -330,18 +506,47 @@ public:
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/* ports from second DMA controller conflict with tandy ports */
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CloseSecondDMAController();
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WriteHandler[2].Install(0x1e0,SN76496Write,IO_MB,2);
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if (enable_hw_tandy_dac) {
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WriteHandler[2].Install(0x1e0,SN76496Write,IO_MB,2);
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WriteHandler[3].Install(0x1e4,TandyDACWrite,IO_MB,4);
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// ReadHandler[3].Install(0x1e4,TandyDACRead,IO_MB,4);
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}
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}
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WriteHandler[0].Install(0xc0,SN76496Write,IO_MB,2);
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WriteHandler[1].Install(0xc4,TandyDACWrite,IO_MB,4);
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Bit32u sample_rate = section->Get_int("tandyrate");
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tandy.chan=MixerChan.Install(&SN76496Update,sample_rate,"TANDY");
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WriteHandler[0].Install(0xc0,SN76496Write,IO_MB,2);
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if (enable_hw_tandy_dac) {
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// enable low-level Tandy DAC emulation
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WriteHandler[1].Install(0xc4,TandyDACWrite,IO_MB,4);
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ReadHandler[1].Install(0xc4,TandyDACRead,IO_MB,4);
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tandy.dac.enabled=true;
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tandy.dac.chan=MixerChanDAC.Install(&TandyDACUpdate,sample_rate,"TANDYDAC");
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tandy.dac.hw.base=0xc4;
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tandy.dac.hw.irq =7;
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tandy.dac.hw.dma =1;
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} else {
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tandy.dac.enabled=false;
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tandy.dac.hw.base=0;
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tandy.dac.hw.irq =0;
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tandy.dac.hw.dma =0;
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}
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tandy.dac.control=0;
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tandy.dac.mode =0;
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tandy.dac.irq_activated=false;
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tandy.dac.frequency=0;
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tandy.dac.amplitude=0;
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tandy.dac.dma.last_sample=0;
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tandy.enabled=false;
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real_writeb(0x40,0xd4,0xff); /* tandy DAC initialization value */
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real_writeb(0x40,0xd4,0xff); /* BIOS Tandy DAC initialization value */
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Bitu i;
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struct SN76496 *R = &sn;
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@ -371,7 +576,7 @@ public:
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static TANDYSOUND* test;
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void TANDYSOUND_ShutDown(Section* sec) {
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void TANDYSOUND_ShutDown(Section* /*sec*/) {
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delete test;
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}
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