mirror of
https://github.com/holub/mame
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502197b9c8
misc MACHINE_CONFIG removal (nw) started work on voltage_regulator_device macros removal (nw)
190 lines
6.8 KiB
C++
190 lines
6.8 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Barry Rodewald
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/*
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* magicsound.cpp
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*
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* Magic Sound Board for the Aleste 520EX
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*
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*/
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#include "emu.h"
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#include "magicsound.h"
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#include "sound/volt_reg.h"
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#include "speaker.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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DEFINE_DEVICE_TYPE(AL_MAGICSOUND, al_magicsound_device, "al_magicsound", "Aleste Magic Sound Board")
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void al_magicsound_device::device_add_mconfig(machine_config &config)
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{
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AM9517A(config, m_dmac, DERIVED_CLOCK(1, 1)); // CLK from expansion port
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// According to the schematics, the TC pin (EOP on western chips) is connected to NMI on the expansion port.
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// NMIs seem to occur too quickly when this is active, so either EOP is not triggered at the correct time, or
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// the K1810WT37 is different to the i8237/AM9517A
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//m_dmac->out_eop_callback().set(DEVICE_SELF_OWNER, FUNC(cpc_expansion_slot_device::nmi_w))/*.invert()*/;
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m_dmac->out_hreq_callback().set(m_dmac, FUNC(am9517a_device::hack_w));
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m_dmac->in_memr_callback().set(FUNC(al_magicsound_device::dma_read_byte));
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m_dmac->out_iow_callback<0>().set(FUNC(al_magicsound_device::dma_write_byte));
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m_dmac->out_iow_callback<1>().set(FUNC(al_magicsound_device::dma_write_byte));
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m_dmac->out_iow_callback<2>().set(FUNC(al_magicsound_device::dma_write_byte));
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m_dmac->out_iow_callback<3>().set(FUNC(al_magicsound_device::dma_write_byte));
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m_dmac->out_dack_callback<0>().set(FUNC(al_magicsound_device::dack0_w));
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m_dmac->out_dack_callback<1>().set(FUNC(al_magicsound_device::dack1_w));
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m_dmac->out_dack_callback<2>().set(FUNC(al_magicsound_device::dack2_w));
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m_dmac->out_dack_callback<3>().set(FUNC(al_magicsound_device::dack3_w));
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// Timing does not seem to be correct.
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// According to the schematics, the clock is from the clock pin on the expansion port (4MHz), and
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// passes through an inverter to each CLK pin on both timers. This seems to be too fast.
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// Timer outputs to SAM0/1/2/3 are sample clocks for each sound channel, D/A0 is the low bit of the channel select.
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PIT8254(config, m_timer1, 0);
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m_timer1->set_clk<0>(4000000);
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m_timer1->out_handler<0>().set(FUNC(al_magicsound_device::sam0_w));
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m_timer1->set_clk<1>(4000000);
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m_timer1->out_handler<1>().set(FUNC(al_magicsound_device::sam1_w));
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m_timer1->set_clk<2>(4000000);
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m_timer1->out_handler<2>().set(FUNC(al_magicsound_device::sam2_w));
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PIT8254(config, m_timer2, 0);
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m_timer2->set_clk<0>(4000000);
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m_timer2->out_handler<0>().set(FUNC(al_magicsound_device::sam3_w));
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m_timer2->set_clk<1>(4000000);
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m_timer2->out_handler<1>().set(FUNC(al_magicsound_device::da0_w));
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m_timer2->set_clk<2>(4000000);
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SPEAKER(config, "speaker").front_center();
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DAC_8BIT_R2R(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.5); // unknown DAC
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voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
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vref.set_output(5.0);
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vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
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vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
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// no pass-through(?)
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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al_magicsound_device::al_magicsound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, AL_MAGICSOUND, tag, owner, clock),
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device_cpc_expansion_card_interface(mconfig, *this), m_slot(nullptr),
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m_dac(*this,"dac"),
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m_dmac(*this,"dmac"),
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m_timer1(*this,"timer1"),
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m_timer2(*this,"timer2"),
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m_current_channel(0), m_ramptr(nullptr), m_current_output(0)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void al_magicsound_device::device_start()
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{
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m_slot = dynamic_cast<cpc_expansion_slot_device *>(owner());
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address_space &space = m_slot->cpu().space(AS_IO);
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space.install_readwrite_handler(0xf8d0,0xf8df,read8_delegate(FUNC(al_magicsound_device::dmac_r),this),write8_delegate(FUNC(al_magicsound_device::dmac_w),this));
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space.install_write_handler(0xf9d0,0xf9df,write8_delegate(FUNC(al_magicsound_device::timer_w),this));
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space.install_write_handler(0xfad0,0xfadf,write8_delegate(FUNC(al_magicsound_device::volume_w),this));
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space.install_write_handler(0xfbd0,0xfbdf,write8_delegate(FUNC(al_magicsound_device::mapper_w),this));
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m_ramptr = machine().device<ram_device>(":" RAM_TAG);
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for(int x=0;x<4;x++)
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{
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save_item(NAME(m_output[x]),x);
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}
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void al_magicsound_device::device_reset()
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{
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m_current_channel = -1;
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m_current_output = 0;
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set_timer_gate(false);
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}
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READ8_MEMBER(al_magicsound_device::dmac_r)
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{
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return m_dmac->read(space,offset);
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}
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WRITE8_MEMBER(al_magicsound_device::dmac_w)
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{
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m_dmac->write(space,offset,data);
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}
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WRITE8_MEMBER(al_magicsound_device::timer_w)
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{
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// can both PITs be selected at the same time?
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if(offset & 0x08)
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m_timer1->write(offset & 0x03,data);
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if(offset & 0x04)
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m_timer2->write(offset & 0x03,data);
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}
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WRITE8_MEMBER(al_magicsound_device::volume_w)
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{
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m_volume[offset & 0x03] = data & 0x3f;
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}
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WRITE8_MEMBER(al_magicsound_device::mapper_w)
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{
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uint8_t channel = (offset & 0x0c) >> 2;
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uint8_t page = offset & 0x03;
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m_page[channel][page] = (~(data) & 0x3f) * 0x4000;
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set_timer_gate(true);
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}
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WRITE_LINE_MEMBER(al_magicsound_device::da0_w)
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{
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m_dac->write(m_output[m_current_output++]);
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if(m_current_output > 3)
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m_current_output = 0;
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}
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WRITE_LINE_MEMBER(al_magicsound_device::dack0_w) { m_dack[0] = state; }
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WRITE_LINE_MEMBER(al_magicsound_device::dack1_w) { m_dack[1] = state; }
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WRITE_LINE_MEMBER(al_magicsound_device::dack2_w) { m_dack[2] = state; }
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WRITE_LINE_MEMBER(al_magicsound_device::dack3_w) { m_dack[3] = state; }
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WRITE_LINE_MEMBER(al_magicsound_device::sam0_w) { m_current_channel = 0; if(m_dack[0] && state) m_dmac->dreq0_w(1); }
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WRITE_LINE_MEMBER(al_magicsound_device::sam1_w) { m_current_channel = 1; if(m_dack[1] && state) m_dmac->dreq1_w(1); }
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WRITE_LINE_MEMBER(al_magicsound_device::sam2_w) { m_current_channel = 2; if(m_dack[2] && state) m_dmac->dreq2_w(1); }
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WRITE_LINE_MEMBER(al_magicsound_device::sam3_w) { m_current_channel = 3; if(m_dack[3] && state) m_dmac->dreq3_w(1); }
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READ8_MEMBER(al_magicsound_device::dma_read_byte)
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{
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uint8_t ret = 0xff;
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uint8_t page = (offset & 0xc000) >> 14;
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if(m_current_channel != -1)
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ret = m_ramptr->read(m_page[m_current_channel][page] + (offset & 0x3fff));
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return ret;
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}
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WRITE8_MEMBER(al_magicsound_device::dma_write_byte)
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{
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m_output[m_current_channel] = data;
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}
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void al_magicsound_device::set_timer_gate(bool state)
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{
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m_timer1->write_gate0(state);
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m_timer1->write_gate1(state);
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m_timer1->write_gate2(state);
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m_timer2->write_gate0(state);
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m_timer2->write_gate1(state);
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m_timer2->write_gate2(state);
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}
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