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m50734: Add A-D converter

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This commit is contained in:
AJR 2022-09-09 20:39:37 -04:00
parent 719c36ef81
commit 6ad4778631
2 changed files with 53 additions and 7 deletions
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43
src/devices/cpu/m6502/m50734.cpp
View File

@ -23,21 +23,21 @@ m50734_device::m50734_device(const machine_config &mconfig, const char *tag, dev
, m_data_config("data", ENDIANNESS_LITTLE, 8, 16, 0)
, m_port_in_cb(*this)
, m_port_out_cb(*this)
, m_analog_in_cb(*this)
, m_port_latch{0, 0, 0, 0}
, m_port_3state{0, 0, 0, 0}
, m_ad_control(0)
, m_ad_register(0)
{
program_config.m_internal_map = address_map_constructor(FUNC(m50734_device::internal_map), this);
}
device_memory_interface::space_config_vector m50734_device::memory_space_config() const
{
space_config_vector scv = m740_device::memory_space_config();
if (has_configured_map(AS_DATA))
return space_config_vector {
std::make_pair(AS_PROGRAM, &program_config),
std::make_pair(AS_DATA, &m_data_config)
};
else
return m740_device::memory_space_config();
scv.emplace_back(AS_DATA, &m_data_config);
return scv;
}
void m50734_device::device_resolve_objects()
@ -46,6 +46,7 @@ void m50734_device::device_resolve_objects()
m_port_in_cb[n].resolve_safe(m_port_3state[n]);
m_port_in_cb[4].resolve_safe(0);
m_port_out_cb.resolve_all_safe();
m_analog_in_cb.resolve_all_safe(0);
}
void m50734_device::device_start()
@ -54,10 +55,14 @@ void m50734_device::device_start()
space(has_space(AS_DATA) ? AS_DATA : AS_PROGRAM).specific(m_data);
m_ad_timer = timer_alloc(FUNC(m50734_device::ad_complete), this);
save_item(NAME(m_port_latch));
save_item(NAME(m_port_direction));
save_item(NAME(m_p0_function));
save_item(NAME(m_p2_p3_function));
save_item(NAME(m_ad_control));
save_item(NAME(m_ad_register));
}
void m50734_device::device_reset()
@ -70,6 +75,8 @@ void m50734_device::device_reset()
m_port_out_cb[n](m_port_3state[n]);
m_p0_function = 0x00;
m_p2_p3_function = 0x00;
m_ad_control |= 0x04;
m_ad_timer->adjust(attotime::never);
}
void m50734_device::read_dummy(u16 adr)
@ -148,9 +155,33 @@ void m50734_device::p2_p3_function_w(u8 data)
m_p2_p3_function = data & 0xc7;
}
u8 m50734_device::ad_control_r()
{
return m_ad_control;
}
void m50734_device::ad_control_w(u8 data)
{
m_ad_control = data & 0x03;
m_ad_timer->adjust(cycles_to_attotime(72)); // 36 µsec at 8 MHz
}
TIMER_CALLBACK_MEMBER(m50734_device::ad_complete)
{
m_ad_register = m_analog_in_cb[m_ad_control & 0x03]();
m_ad_control |= 0x04;
}
u8 m50734_device::ad_r()
{
return m_ad_register;
}
void m50734_device::internal_map(address_map &map)
{
// TODO: timers, etc.
map(0x00e9, 0x00e9).rw(FUNC(m50734_device::ad_control_r), FUNC(m50734_device::ad_control_w));
map(0x00ea, 0x00ea).r(FUNC(m50734_device::ad_r));
map(0x00eb, 0x00eb).r(FUNC(m50734_device::p4_r));
map(0x00ed, 0x00ed).rw(FUNC(m50734_device::p2_p3_function_r), FUNC(m50734_device::p2_p3_function_w));
map(0x00ee, 0x00ef).rw(FUNC(m50734_device::port_r<3>), FUNC(m50734_device::port_w<3>));

17
src/devices/cpu/m6502/m50734.h
View File

@ -66,6 +66,10 @@ public:
auto p3_in_cb() { return m_port_in_cb[3].bind(); }
auto p3_out_cb() { return m_port_out_cb[3].bind(); }
auto p4_in_cb() { return m_port_in_cb[4].bind(); }
auto an0_in_cb() { return m_analog_in_cb[0].bind(); }
auto an1_in_cb() { return m_analog_in_cb[1].bind(); }
auto an2_in_cb() { return m_analog_in_cb[2].bind(); }
auto an3_in_cb() { return m_analog_in_cb[3].bind(); }
// port three-state output configuration
void set_p0_3state(u8 value) { assert(!configured()); m_port_3state[0] = value; }
@ -92,7 +96,6 @@ protected:
virtual void write_data(u16 adr, u8 val) override;
private:
void internal_map(address_map &map);
template <int N> u8 port_r(offs_t offset);
template <int N> void port_w(offs_t offset, u8 data);
u8 p4_r();
@ -100,18 +103,30 @@ private:
void p0_function_w(u8 data);
u8 p2_p3_function_r();
void p2_p3_function_w(u8 data);
u8 ad_control_r();
void ad_control_w(u8 data);
u8 ad_r();
TIMER_CALLBACK_MEMBER(ad_complete);
void internal_map(address_map &map);
const address_space_config m_data_config;
memory_access<16, 0, 0, ENDIANNESS_LITTLE>::specific m_data;
devcb_read8::array<5> m_port_in_cb;
devcb_write8::array<4> m_port_out_cb;
devcb_read8::array<4> m_analog_in_cb;
emu_timer *m_ad_timer;
u8 m_port_latch[4];
u8 m_port_direction[4];
u8 m_port_3state[4];
u8 m_p0_function;
u8 m_p2_p3_function;
u8 m_ad_control;
u8 m_ad_register;
};
DECLARE_DEVICE_TYPE(M50734, m50734_device)