dingusppc/devices/awacs.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-20 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** AWAC sound devices family definitions.
Audio Waveform Aplifier and Converter (AWAC) is a family of custom audio
chips used in Power Macintosh.
*/
#ifndef AWAC_H
#define AWAC_H
//#define SDL
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#include <cinttypes>
#include "i2c.h"
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#include "dbdma.h"
#ifdef SDL
#include <thirdparty/SDL2/include/SDL.h>
//#else
//#include "thirdparty/portaudio/include/portaudio.h"
#endif
//#include "libsoundio/soundio/soundio.h"
#include <thirdparty/libsoundio/soundio/soundio.h>
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/** AWAC registers offsets. */
enum {
AWAC_SOUND_CTRL_REG = 0x00,
AWAC_CODEC_CTRL_REG = 0x10,
AWAC_CODEC_STATUS_REG = 0x20,
};
/** AWAC manufacturer and revision. */
#define AWAC_MAKER_CRYSTAL 1
#define AWAC_REV_SCREAMER 3
/** Apple source calls this kValidData but doesn't explain
what it actually means. It seems like it's used to check
if the sound codec is available.
*/
#define AWAC_AVAILABLE 0x40
/** Audio processor chip (TDA7433) emulation. */
class AudioProcessor : public I2CDevice {
public:
AudioProcessor() = default;
~AudioProcessor() = default;
void start_transaction() { this->pos = 0; };
bool send_subaddress(uint8_t sub_addr) {
if ((sub_addr & 0xF) > 6)
return false; /* invalid subaddress -> no acknowledge */
this->sub_addr = sub_addr & 0xF;
this->auto_inc = !!(sub_addr & 0x10);
LOG_F(INFO, "TDA7433 subaddress = 0x%X, auto increment = %d",
this->sub_addr, this->auto_inc);
this->pos++;
return true;
};
bool send_byte(uint8_t data) {
if (!this->pos) {
return send_subaddress(data);
} else if (this->sub_addr <= 6) {
LOG_F(INFO, "TDA7433 byte 0x%X received", data);
this->regs[this->sub_addr] = data;
if (this->auto_inc) {
this->sub_addr++;
}
return true;
} else {
return false; /* invalid sub_addr -> no acknowledge */
}
};
bool receive_byte(uint8_t *p_data) {
*p_data = this->regs[this->sub_addr];
LOG_F(INFO, "TDA7433 byte 0x%X sent", *p_data);
return true;
};
private:
uint8_t regs[7]; /* control registers, see TDA7433 datasheet */
uint8_t sub_addr;
int pos;
int auto_inc;
};
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class AWACDevice : public DMACallback {
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public:
AWACDevice();
~AWACDevice();
void set_dma_out(DMAChannel *dma_out_ch);
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uint32_t snd_ctrl_read(uint32_t offset, int size);
void snd_ctrl_write(uint32_t offset, uint32_t value, int size);
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/* DMACallback methods */
void dma_start();
void dma_end();
protected:
void open_stream(int sample_rate);
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private:
uint32_t snd_ctrl_reg = {0};
uint16_t control_regs[8] = {0}; /* control registers, each 12-bits wide */
uint8_t is_busy = 0;
AudioProcessor *audio_proc;
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SoundIoDevice *out_device;
SoundIoOutStream *out_stream;
bool out_stream_ready;
int out_sample_rate;
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DMAChannel *dma_out_ch;
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uint8_t* snd_buf = 0;
uint32_t buf_len = 0;
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};
#endif /* AWAC_H */