Files
86Box/src/sound/snd_pssj.c
2022-09-18 17:22:55 -04:00

313 lines
7.9 KiB
C

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/device.h>
#include <86box/dma.h>
#include <86box/io.h>
#include <86box/pic.h>
#include <86box/sound.h>
#include <86box/snd_sn76489.h>
#include <86box/timer.h>
typedef struct pssj_t {
sn76489_t sn76489;
uint8_t ctrl;
uint8_t wave;
uint8_t dac_val;
uint16_t freq;
int amplitude;
int irq;
pc_timer_t timer_count;
int enable;
int wave_pos;
int pulse_width;
int16_t buffer[SOUNDBUFLEN];
int pos;
} pssj_t;
static void
pssj_update_irq(pssj_t *pssj)
{
if (pssj->irq && (pssj->ctrl & 0x10) && (pssj->ctrl & 0x08))
picint(1 << 7);
}
static void
pssj_write(uint16_t port, uint8_t val, void *p)
{
pssj_t *pssj = (pssj_t *) p;
switch (port & 3) {
case 0:
pssj->ctrl = val;
if (!pssj->enable && ((val & 4) && (pssj->ctrl & 3)))
timer_set_delay_u64(&pssj->timer_count, (TIMER_USEC * (1000000.0 / 3579545.0) * (double) (pssj->freq ? pssj->freq : 0x400)));
pssj->enable = (val & 4) && (pssj->ctrl & 3);
if (!pssj->enable)
timer_disable(&pssj->timer_count);
sn74689_set_extra_divide(&pssj->sn76489, val & 0x40);
if (!(val & 8))
pssj->irq = 0;
pssj_update_irq(pssj);
break;
case 1:
switch (pssj->ctrl & 3) {
case 1: /*Sound channel*/
pssj->wave = val;
pssj->pulse_width = val & 7;
break;
case 3: /*Direct DAC*/
pssj->dac_val = val;
break;
}
break;
case 2:
pssj->freq = (pssj->freq & 0xf00) | val;
break;
case 3:
pssj->freq = (pssj->freq & 0x0ff) | ((val & 0xf) << 8);
pssj->amplitude = val >> 4;
break;
}
}
static uint8_t
pssj_read(uint16_t port, void *p)
{
pssj_t *pssj = (pssj_t *) p;
switch (port & 3) {
case 0:
return (pssj->ctrl & ~0x88) | (pssj->irq ? 8 : 0);
case 1:
switch (pssj->ctrl & 3) {
case 0: /*Joystick*/
return 0;
case 1: /*Sound channel*/
return pssj->wave;
case 2: /*Successive approximation*/
return 0x80;
case 3: /*Direct DAC*/
return pssj->dac_val;
}
break;
case 2:
return pssj->freq & 0xff;
case 3:
return (pssj->freq >> 8) | (pssj->amplitude << 4);
default:
return 0xff;
}
return 0xff;
}
static void
pssj_update(pssj_t *pssj)
{
for (; pssj->pos < sound_pos_global; pssj->pos++)
pssj->buffer[pssj->pos] = (((int8_t) (pssj->dac_val ^ 0x80) * 0x20) * pssj->amplitude) / 15;
}
static void
pssj_callback(void *p)
{
pssj_t *pssj = (pssj_t *) p;
int data;
pssj_update(pssj);
if (pssj->ctrl & 2) {
if ((pssj->ctrl & 3) == 3) {
data = dma_channel_read(1);
if (data != DMA_NODATA) {
pssj->dac_val = data & 0xff;
}
} else {
data = dma_channel_write(1, 0x80);
}
if ((data & DMA_OVER) && data != DMA_NODATA) {
if (pssj->ctrl & 0x08) {
pssj->irq = 1;
pssj_update_irq(pssj);
}
}
} else {
switch (pssj->wave & 0xc0) {
case 0x00: /*Pulse*/
pssj->dac_val = (pssj->wave_pos > (pssj->pulse_width << 1)) ? 0xff : 0;
break;
case 0x40: /*Ramp*/
pssj->dac_val = pssj->wave_pos << 3;
break;
case 0x80: /*Triangle*/
if (pssj->wave_pos & 16)
pssj->dac_val = (pssj->wave_pos ^ 31) << 4;
else
pssj->dac_val = pssj->wave_pos << 4;
break;
case 0xc0:
pssj->dac_val = 0x80;
break;
}
pssj->wave_pos = (pssj->wave_pos + 1) & 31;
}
timer_advance_u64(&pssj->timer_count, (TIMER_USEC * (1000000.0 / 3579545.0) * (double) (pssj->freq ? pssj->freq : 0x400)));
}
static void
pssj_get_buffer(int32_t *buffer, int len, void *p)
{
pssj_t *pssj = (pssj_t *) p;
int c;
pssj_update(pssj);
for (c = 0; c < len * 2; c++)
buffer[c] += pssj->buffer[c >> 1];
pssj->pos = 0;
}
void *
pssj_init(const device_t *info)
{
pssj_t *pssj = malloc(sizeof(pssj_t));
memset(pssj, 0, sizeof(pssj_t));
sn76489_init(&pssj->sn76489, 0x00c0, 0x0004, PSSJ, 3579545);
io_sethandler(0x00C4, 0x0004, pssj_read, NULL, NULL, pssj_write, NULL, NULL, pssj);
timer_add(&pssj->timer_count, pssj_callback, pssj, pssj->enable);
sound_add_handler(pssj_get_buffer, pssj);
return pssj;
}
void *
pssj_1e0_init(const device_t *info)
{
pssj_t *pssj = malloc(sizeof(pssj_t));
memset(pssj, 0, sizeof(pssj_t));
sn76489_init(&pssj->sn76489, 0x01e0, 0x0004, PSSJ, 3579545);
io_sethandler(0x01E4, 0x0004, pssj_read, NULL, NULL, pssj_write, NULL, NULL, pssj);
timer_add(&pssj->timer_count, pssj_callback, pssj, pssj->enable);
sound_add_handler(pssj_get_buffer, pssj);
return pssj;
}
#if defined(DEV_BRANCH) && defined(USE_TANDY_ISA)
void *
pssj_isa_init(const device_t *info)
{
pssj_t *pssj = malloc(sizeof(pssj_t));
memset(pssj, 0, sizeof(pssj_t));
sn76489_init(&pssj->sn76489, 0x00c0, 0x0004, PSSJ, 3579545);
uint16_t addr = device_get_config_hex16("base");
io_sethandler(addr, 0x0004, pssj_read, NULL, NULL, pssj_write, NULL, NULL, pssj);
timer_add(&pssj->timer_count, pssj_callback, pssj, pssj->enable);
sound_add_handler(pssj_get_buffer, pssj);
return pssj;
}
#endif
void
pssj_close(void *p)
{
pssj_t *pssj = (pssj_t *) p;
free(pssj);
}
#if defined(DEV_BRANCH) && defined(USE_TANDY_ISA)
static const device_config_t pssj_isa_config[] = {
// clang-format off
{
.name = "base",
.description = "Address",
.type = CONFIG_HEX16,
.default_string = "",
.default_int = 0x2C0,
.file_filter = "",
.spinner = { 0 },
.selection = {
{
.description = "0x0C0",
.value = 0x0C0
},
{
.description = "0x1E0",
.value = 0x1E0
},
{
.description = "0x2C0",
.value = 0x2C0
},
{ .description = "" }
}
},
{ .name = "", .description = "", .type = CONFIG_END }
// clang-format on
};
#endif
const device_t pssj_device = {
.name = "Tandy PSSJ",
.internal_name = "pssj",
.flags = 0,
.local = 0,
.init = pssj_init,
.close = pssj_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t pssj_1e0_device = {
.name = "Tandy PSSJ (port 1e0h)",
.internal_name = "pssj_1e0",
.flags = 0,
.local = 0,
.init = pssj_1e0_init,
.close = pssj_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
#if defined(DEV_BRANCH) && defined(USE_TANDY_ISA)
const device_t pssj_isa_device = {
.name = "Tandy PSSJ Clone",
.internal_name = "pssj_isa",
.flags = DEVICE_ISA,
.local = 0,
.init = pssj_isa_init,
.close = pssj_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = pssj_isa_config
};
#endif