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sdk51: Add USART access (nw)

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This commit is contained in:
AJR 2018-10-06 12:31:38 -04:00
parent 018fdbb302
commit f42dc7059b
1 changed files with 34 additions and 1 deletions
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35
src/mame/drivers/sdk51.cpp
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@ -50,12 +50,18 @@ private:
u8 brkmem_r(offs_t offset);
void brkmem_w(offs_t offset, u8 data);
u8 upibus_r();
void upibus_w(u8 data);
void serial_control_w(u8 data);
required_device<mcs51_cpu_device> m_maincpu;
required_device<address_map_bank_device> m_progmem;
required_device<address_map_bank_device> m_datamem;
required_device<address_map_bank_device> m_mem0;
required_device<i8251_device> m_usart;
required_region_ptr<u8> m_cycles;
u8 m_serial_control;
};
READ8_MEMBER(sdk51_state::psen_r)
@ -83,6 +89,27 @@ void sdk51_state::brkmem_w(offs_t offset, u8 data)
m_mem0->set_bank(0);
}
u8 sdk51_state::upibus_r()
{
u8 result = 0xff;
if (!BIT(m_serial_control, 0))
result &= m_usart->read(BIT(m_serial_control, 2));
return result;
}
void sdk51_state::upibus_w(u8 data)
{
if (!BIT(m_serial_control, 1))
m_usart->write(BIT(m_serial_control, 2), data);
}
void sdk51_state::serial_control_w(u8 data)
{
m_serial_control = data;
}
void sdk51_state::psen_map(address_map &map)
{
map(0x0000, 0xffff).r(FUNC(sdk51_state::psen_r));
@ -120,6 +147,9 @@ INPUT_PORTS_END
void sdk51_state::machine_start()
{
m_serial_control = 0x0f;
save_item(NAME(m_serial_control));
}
void sdk51_state::machine_reset()
@ -150,12 +180,15 @@ void sdk51_state::sdk51(machine_config &config)
m_mem0->set_stride(0x2000);
upi41_cpu_device &upi(I8041(config, "upi", 6_MHz_XTAL));
upi.p1_in_cb().set(FUNC(sdk51_state::upibus_r));
upi.p1_out_cb().set(FUNC(sdk51_state::upibus_w));
upi.p2_in_cb().set("upiexp", FUNC(i8243_device::p2_r));
upi.p2_out_cb().set("upiexp", FUNC(i8243_device::p2_w));
upi.prog_out_cb().set("upiexp", FUNC(i8243_device::prog_w));
upi.t1_in_cb().set(m_usart, FUNC(i8251_device::txrdy_r));
I8243(config, "upiexp");
i8243_device &upiexp(I8243(config, "upiexp"));
upiexp.p4_out_cb().set(FUNC(sdk51_state::serial_control_w));
i8155_device &io(I8155(config, "io", 6_MHz_XTAL / 3));
io.out_to_callback().set(m_usart, FUNC(i8251_device::write_txc));