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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
// DSP 563xx HI08 host interface
#include "emu.h"
#include "hi08.h"
#include "dsp563xx.h"
DEFINE_DEVICE_TYPE(HI08, hi08_device, "hi08", "DSP563xx HI08 host interface")
hi08_device::hi08_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
device_t(mconfig, HI08, tag, owner, clock),
m_cpu(*this, DEVICE_SELF_OWNER)
{
}
void hi08_device::device_start()
{
save_item(NAME(m_hcr));
save_item(NAME(m_hpcr));
save_item(NAME(m_hbar));
save_item(NAME(m_hrx));
save_item(NAME(m_htx));
save_item(NAME(m_tx));
save_item(NAME(m_icr));
save_item(NAME(m_cvr));
save_item(NAME(m_isr));
save_item(NAME(m_ivr));
}
void hi08_device::device_reset()
{
m_hcr = 0;
m_hpcr = 0;
m_hbar = 0x80;
m_hrx = 0;
m_htx = 0;
m_tx = 0;
m_icr = 0;
m_cvr = 0x32;
m_isr = 3;
m_ivr = 15;
}
void hi08_device::write(offs_t offset, u8 data)
{
switch(offset) {
case 0:
m_icr = data & 0xbf;
logerror("host write isr %02x (%s)\n", m_isr, machine().describe_context());
break;
case 1:
m_cvr = data;
logerror("host write cvr %02x (%s)\n", m_cvr, machine().describe_context());
break;
case 2:
logerror("host rejected write isr %02x (%s)\n", data, machine().describe_context());
break;
case 3:
m_ivr = data;
logerror("host write ivr %02x (%s)\n", m_ivr, machine().describe_context());
break;
case 4:
logerror("host rejected write unused %02x (%s)\n", data, machine().describe_context());
break;
case 5:
if(m_icr & ICR_HLEND)
m_tx = (m_tx & 0xffff00) | data;
else
m_tx = (m_tx & 0x00ffff) | (data << 16);
break;
case 6:
m_tx = (m_tx & 0xff00ff) | (data << 8);
break;
case 7:
if(m_icr & ICR_HLEND)
m_tx = (m_tx & 0x00ffff) | (data << 16);
else
m_tx = (m_tx & 0xffff00) | data;
m_hrx = m_tx;
logerror("received %06x (%s)\n", m_hrx, machine().describe_context());
m_isr &= ~ISR_TXDE;
if(!(m_isr & ISR_RXDF))
m_isr |= ISR_TRDY;
machine().scheduler().synchronize();
break;
}
}
u8 hi08_device::read(offs_t offset)
{
switch(offset) {
case 0:
logerror("host read icr (%s)\n", machine().describe_context());
return m_icr;
case 1:
logerror("host read cvr (%s)\n", machine().describe_context());
return m_cvr;
case 2:
logerror("host read isr (%s)\n", machine().describe_context());
return m_isr;
case 3:
logerror("host read ivr (%s)\n", machine().describe_context());
return m_ivr;
case 4:
logerror("host read unused (%s)\n", machine().describe_context());
return 0x00;
case 5:
return m_htx >> (m_icr & ICR_HLEND ? 0 : 16);
case 6:
return m_htx >> 8;
case 7:
return m_htx >> (m_icr & ICR_HLEND ? 16 : 0);
}
return 0;
}
void hi08_device::map(address_map &map)
{
map(0*4, 0*4+3).rw(FUNC(hi08_device::hcr_r), FUNC(hi08_device::hcr_w));
map(1*4, 1*4+3).r(FUNC(hi08_device::hsr_r));
map(2*4, 2*4+3).rw(FUNC(hi08_device::hpcr_r), FUNC(hi08_device::hpcr_w));
map(3*4, 3*4+3).rw(FUNC(hi08_device::hbar_r), FUNC(hi08_device::hbar_w));
map(4*4, 4*4+3).r(FUNC(hi08_device::hrx_r));
map(5*4, 5*4+3).w(FUNC(hi08_device::htx_w));
}
void hi08_device::hcr_w(u32 data)
{
m_hcr = data & 0x1f;
logerror("hcr_w %02x (%s)\n", m_hcr, machine().describe_context());
}
u32 hi08_device::hcr_r()
{
logerror("hcr_r %02x (%s)\n", m_hcr, machine().describe_context());
return m_hcr;
}
u32 hi08_device::hsr_r()
{
u16 hsr = 0;
if(!(m_isr & ISR_TXDE))
hsr |= HSR_HRDF;
if(!(m_isr & ISR_RXDF))
hsr |= HSR_HTDE;
if(m_cvr & CVR_HC)
hsr |= HSR_HCP;
hsr |= m_icr & (ICR_HF1 | ICR_HF0);
return hsr;
}
void hi08_device::hpcr_w(u32 data)
{
m_hpcr = data & 0xff7f;
logerror("hpcr_w %04x (%s)\n", m_hpcr, machine().describe_context());
}
u32 hi08_device::hpcr_r()
{
logerror("hpcr_r %04x (%s)\n", m_hpcr, machine().describe_context());
return m_hpcr;
}
void hi08_device::hbar_w(u32 data)
{
m_hbar = data;
logerror("hbar_w %02x (%s)\n", m_hbar, machine().describe_context());
}
u32 hi08_device::hbar_r()
{
logerror("hbar_r (%s)\n", machine().describe_context());
return m_hbar;
}
u32 hi08_device::hrx_r()
{
logerror("hrx_r %06x (%s)\n", m_hrx, machine().describe_context());
m_isr = (m_isr & ~ISR_TRDY) | ISR_TXDE;
machine().scheduler().synchronize();
return m_hrx;
}
void hi08_device::htx_w(u32 data)
{
logerror("htx_w %06x (%s)\n", data, machine().describe_context());
}
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