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Diffstat (limited to 'src/devices/sound/cdp1864.cpp')
-rw-r--r-- | src/devices/sound/cdp1864.cpp | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/src/devices/sound/cdp1864.cpp b/src/devices/sound/cdp1864.cpp new file mode 100644 index 00000000000..b4859cee4a3 --- /dev/null +++ b/src/devices/sound/cdp1864.cpp @@ -0,0 +1,467 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + RCA CDP1864C COS/MOS PAL Compatible Color TV Interface + +**********************************************************************/ + +/* + + TODO: + + - interlace mode + - PAL output, currently using RGB + - cpu synchronization + + SC1 and SC0 are used to provide CDP1864C-to-CPU synchronization for a jitter-free display. + During every horizontal sync the CDP1864C samples SC0 and SC1 for SC0 = 1 and SC1 = 0 + (CDP1800 execute state). Detection of a fetch cycle causes the CDP1864C to skip cycles to + attain synchronization. (i.e. picture moves 8 pixels to the right) + +*/ + +#include "cdp1864.h" + + + +//************************************************************************** +// MACROS / CONSTANTS +//************************************************************************** + +#define CDP1864_DEFAULT_LATCH 0x35 + +#define CDP1864_CYCLES_DMA_START 2*8 +#define CDP1864_CYCLES_DMA_ACTIVE 8*8 +#define CDP1864_CYCLES_DMA_WAIT 6*8 + +const int cdp1864_device::bckgnd[] = { 2, 0, 4, 1 }; + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +// devices +const device_type CDP1864 = &device_creator<cdp1864_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// cdp1864_device - constructor +//------------------------------------------------- + +cdp1864_device::cdp1864_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, CDP1864, "CDP1864", tag, owner, clock, "cdp1864", __FILE__), + device_sound_interface(mconfig, *this), + device_video_interface(mconfig, *this), + m_read_inlace(*this), + m_read_rdata(*this), + m_read_bdata(*this), + m_read_gdata(*this), + m_write_irq(*this), + m_write_dma_out(*this), + m_write_efx(*this), + m_write_hsync(*this), + m_disp(0), + m_dmaout(0), + m_bgcolor(0), + m_con(0), + m_aoe(0), + m_latch(CDP1864_DEFAULT_LATCH) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void cdp1864_device::device_start() +{ + // resolve callbacks + m_read_inlace.resolve_safe(1); + m_read_rdata.resolve_safe(0); + m_read_bdata.resolve_safe(0); + m_read_gdata.resolve_safe(0); + m_write_irq.resolve_safe(); + m_write_dma_out.resolve_safe(); + m_write_efx.resolve_safe(); + m_write_hsync.resolve_safe(); + + // initialize palette + initialize_palette(); + + // create sound stream + m_stream = machine().sound().stream_alloc(*this, 0, 1, machine().sample_rate()); + + // allocate timers + m_int_timer = timer_alloc(TIMER_INT); + m_efx_timer = timer_alloc(TIMER_EFX); + m_dma_timer = timer_alloc(TIMER_DMA); + m_hsync_timer = timer_alloc(TIMER_HSYNC); + + // find devices + m_screen->register_screen_bitmap(m_bitmap); + + // register for state saving + save_item(NAME(m_disp)); + save_item(NAME(m_dmaout)); + save_item(NAME(m_bgcolor)); + save_item(NAME(m_con)); + save_item(NAME(m_aoe)); + save_item(NAME(m_latch)); + save_item(NAME(m_signal)); + save_item(NAME(m_incr)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void cdp1864_device::device_reset() +{ + m_int_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_INT_START, 0)); + m_efx_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_EFX_TOP_START, 0)); + m_dma_timer->adjust(clocks_to_attotime(CDP1864_CYCLES_DMA_START)); + + m_disp = 0; + m_dmaout = 0; + + m_write_irq(CLEAR_LINE); + m_write_dma_out(CLEAR_LINE); + m_write_efx(CLEAR_LINE); + m_write_hsync(CLEAR_LINE); +} + + +//------------------------------------------------- +// device_timer - handle timer events +//------------------------------------------------- + +void cdp1864_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) +{ + int scanline = m_screen->vpos(); + + switch (id) + { + case TIMER_INT: + if (scanline == CDP1864_SCANLINE_INT_START) + { + if (m_disp) + { + m_write_irq(ASSERT_LINE); + } + + m_int_timer->adjust(m_screen->time_until_pos( CDP1864_SCANLINE_INT_END, 0)); + } + else + { + if (m_disp) + { + m_write_irq(CLEAR_LINE); + } + + m_int_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_INT_START, 0)); + } + break; + + case TIMER_EFX: + switch (scanline) + { + case CDP1864_SCANLINE_EFX_TOP_START: + m_write_efx(ASSERT_LINE); + m_efx_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_EFX_TOP_END, 0)); + break; + + case CDP1864_SCANLINE_EFX_TOP_END: + m_write_efx(CLEAR_LINE); + m_efx_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_EFX_BOTTOM_START, 0)); + break; + + case CDP1864_SCANLINE_EFX_BOTTOM_START: + m_write_efx(ASSERT_LINE); + m_efx_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_EFX_BOTTOM_END, 0)); + break; + + case CDP1864_SCANLINE_EFX_BOTTOM_END: + m_write_efx(CLEAR_LINE); + m_efx_timer->adjust(m_screen->time_until_pos(CDP1864_SCANLINE_EFX_TOP_START, 0)); + break; + } + break; + + case TIMER_DMA: + if (m_dmaout) + { + if (m_disp) + { + if (scanline >= CDP1864_SCANLINE_DISPLAY_START && scanline < CDP1864_SCANLINE_DISPLAY_END) + { + m_write_dma_out(CLEAR_LINE); + } + } + + m_dma_timer->adjust(clocks_to_attotime(CDP1864_CYCLES_DMA_WAIT)); + + m_dmaout = 0; + } + else + { + if (m_disp) + { + if (scanline >= CDP1864_SCANLINE_DISPLAY_START && scanline < CDP1864_SCANLINE_DISPLAY_END) + { + m_write_dma_out(ASSERT_LINE); + } + } + + m_dma_timer->adjust(clocks_to_attotime(CDP1864_CYCLES_DMA_ACTIVE)); + + m_dmaout = 1; + } + break; + } +} + + +//------------------------------------------------- +// sound_stream_update - handle update requests for +// our sound stream +//------------------------------------------------- + +void cdp1864_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) +{ + // reset the output stream + memset(outputs[0], 0, samples * sizeof(*outputs[0])); + + INT16 signal = m_signal; + stream_sample_t *buffer = outputs[0]; + + memset( buffer, 0, samples * sizeof(*buffer) ); + + if (m_aoe) + { + double frequency = unscaled_clock() / 8 / 4 / (m_latch + 1) / 2; + int rate = machine().sample_rate() / 2; + + /* get progress through wave */ + int incr = m_incr; + + if (signal < 0) + { + signal = -0x7fff; + } + else + { + signal = 0x7fff; + } + + while( samples-- > 0 ) + { + *buffer++ = signal; + incr -= frequency; + while( incr < 0 ) + { + incr += rate; + signal = -signal; + } + } + + /* store progress through wave */ + m_incr = incr; + m_signal = signal; + } +} + + +//------------------------------------------------- +// dispon_r - +//------------------------------------------------- + +READ8_MEMBER( cdp1864_device::dispon_r ) +{ + m_disp = 1; + + return 0xff; +} + + +//------------------------------------------------- +// dispoff_r - +//------------------------------------------------- + +READ8_MEMBER( cdp1864_device::dispoff_r ) +{ + m_disp = 0; + + m_write_irq(CLEAR_LINE); + m_write_dma_out(CLEAR_LINE); + + return 0xff; +} + + +//------------------------------------------------- +// step_bgcolor_w - +//------------------------------------------------- + +WRITE8_MEMBER( cdp1864_device::step_bgcolor_w ) +{ + m_disp = 1; + + m_bgcolor++; + m_bgcolor &= 0x03; +} + + +//------------------------------------------------- +// tone_latch_w - +//------------------------------------------------- + +WRITE8_MEMBER( cdp1864_device::tone_latch_w ) +{ + m_latch = data; +} + + +//------------------------------------------------- +// dma_w - +//------------------------------------------------- + +WRITE8_MEMBER( cdp1864_device::dma_w ) +{ + int rdata = 1, bdata = 1, gdata = 1; + int sx = m_screen->hpos() + 4; + int y = m_screen->vpos(); + + if (!m_con) + { + rdata = m_read_rdata(); + bdata = m_read_bdata(); + gdata = m_read_gdata(); + } + + for (int x = 0; x < 8; x++) + { + int color = bckgnd[m_bgcolor] + 8; + + if (BIT(data, 7)) + { + color = (gdata << 2) | (bdata << 1) | rdata; + } + + m_bitmap.pix32(y, sx + x) = m_palette[color]; + + data <<= 1; + } +} + + +//------------------------------------------------- +// con_w - color on write +//------------------------------------------------- + +WRITE_LINE_MEMBER( cdp1864_device::con_w ) +{ + if (!state) + { + m_con = 0; + } +} + + +//------------------------------------------------- +// aoe_w - audio output enable write +//------------------------------------------------- + +WRITE_LINE_MEMBER( cdp1864_device::aoe_w ) +{ + if (!state) + { + m_latch = CDP1864_DEFAULT_LATCH; + } + + m_aoe = state; +} + + +//------------------------------------------------- +// evs_w - external vertical sync write +//------------------------------------------------- + +WRITE_LINE_MEMBER( cdp1864_device::evs_w ) +{ +} + + +//------------------------------------------------- +// update_screen - +//------------------------------------------------- + +UINT32 cdp1864_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + if (m_disp) + { + copybitmap(bitmap, m_bitmap, 0, 0, 0, 0, cliprect); + m_bitmap.fill(m_palette[bckgnd[m_bgcolor] + 8], cliprect); + } + else + { + bitmap.fill(rgb_t::black, cliprect); + } + + return 0; +} + + +//------------------------------------------------- +// initialize_palette - +//------------------------------------------------- + +void cdp1864_device::initialize_palette() +{ + const int resistances_r[] = { m_chr_r }; + const int resistances_g[] = { m_chr_g }; + const int resistances_b[] = { m_chr_b }; + + double color_weights_r[1], color_weights_g[1], color_weights_b[1]; + double color_weights_bkg_r[1], color_weights_bkg_g[1], color_weights_bkg_b[1]; + + compute_resistor_weights(0, 0xff, -1.0, + 1, resistances_r, color_weights_r, 0, m_chr_bkg, + 1, resistances_g, color_weights_g, 0, m_chr_bkg, + 1, resistances_b, color_weights_b, 0, m_chr_bkg); + + compute_resistor_weights(0, 0xff, -1.0, + 1, resistances_r, color_weights_bkg_r, m_chr_bkg, 0, + 1, resistances_g, color_weights_bkg_g, m_chr_bkg, 0, + 1, resistances_b, color_weights_bkg_b, m_chr_bkg, 0); + + for (int i = 0; i < 8; i++) + { + // foreground colors + UINT8 r = 0, g = 0, b = 0; + + if (m_chr_r != RES_INF) r = combine_1_weights(color_weights_r, BIT(i, 0)); + if (m_chr_b != RES_INF) b = combine_1_weights(color_weights_b, BIT(i, 1)); + if (m_chr_g != RES_INF) g = combine_1_weights(color_weights_g, BIT(i, 2)); + + m_palette[i] = rgb_t(r, g, b); + + // background colors + r = 0, g = 0, b = 0; + + if (m_chr_r != RES_INF) r = combine_1_weights(color_weights_bkg_r, BIT(i, 0)); + if (m_chr_b != RES_INF) b = combine_1_weights(color_weights_bkg_b, BIT(i, 1)); + if (m_chr_g != RES_INF) g = combine_1_weights(color_weights_bkg_g, BIT(i, 2)); + + m_palette[i + 8] = rgb_t(r, g, b); + } +} |