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tms1024: added MS pin, added write to port 0 (nw)

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This commit is contained in:
hap 2017-03-24 18:26:13 +01:00
parent a925c5e8db
commit 0e5d1ffe4a
3 changed files with 37 additions and 31 deletions
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58
src/devices/machine/tms1024.cpp
View File

@ -4,13 +4,12 @@
Texas Instruments TMS1024/TMS1025 I/O expander
No documentation was available, just a pinout.
No documentation was available, just a pinout. But documentation
is available for pin-compatible Mitsubishi M50780SP/M50781SP.
Other than more port pins, TMS1025 is assumed to be same as TMS1024.
TODO:
- writes to port 0
- what's the MS pin?
- strobe is on rising edge? or falling edge?
- x
*/
@ -26,7 +25,7 @@ const device_type TMS1025 = device_creator<tms1025_device>;
//-------------------------------------------------
tms1024_device::tms1024_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, u32 clock, const char *shortname, const char *source)
: device_t(mconfig, type, name, tag, owner, clock, shortname, source), m_h(0), m_s(0), m_std(0),
: device_t(mconfig, type, name, tag, owner, clock, shortname, source), m_h(0), m_s(0), m_std(0), m_ms(0),
m_read_port{{*this}, {*this}, {*this}, {*this}, {*this}, {*this}, {*this}},
m_write_port{{*this}, {*this}, {*this}, {*this}, {*this}, {*this}, {*this}}
{
@ -56,24 +55,11 @@ void tms1024_device::device_start()
for (devcb_write8 &cb : m_write_port)
cb.resolve_safe();
// zerofill
m_h = 0;
m_s = 0;
m_std = 0;
// register for savestates
save_item(NAME(m_h));
save_item(NAME(m_s));
save_item(NAME(m_std));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void tms1024_device::device_reset()
{
save_item(NAME(m_ms));
}
@ -88,6 +74,20 @@ WRITE8_MEMBER(tms1024_device::write_h)
m_h = data & 0xf;
}
READ8_MEMBER(tms1024_device::read_h)
{
if (!m_ms)
{
// read selected port data
if (m_s != 0)
m_h = (m_read_port[m_s-1])((offs_t)(m_s-1)) & 0xf;
// high-impedance otherwise
}
return m_h;
}
WRITE8_MEMBER(tms1024_device::write_s)
{
// S0,1,2: select port
@ -98,21 +98,25 @@ WRITE_LINE_MEMBER(tms1024_device::write_std)
{
state = (state) ? 1 : 0;
// output on rising edge
if (state && !m_std)
// output on falling edge
if (m_ms && !state && m_std)
{
if (m_s != 0)
(m_write_port[m_s-1])((offs_t)(m_s-1), m_h);
else
{
// reset all ports
for (int i = TMS1025_PORT1; i <= TMS1025_PORT7; i++)
(m_write_port[i])((offs_t)(i), 0);
}
}
m_std = state;
}
READ8_MEMBER(tms1024_device::read_h)
WRITE_LINE_MEMBER(tms1024_device::write_ms)
{
// TODO: which pin enables read?
if (m_s != 0)
m_h = (m_read_port[m_s-1])((offs_t)(m_s-1)) & 0xf;
return m_h;
// 0: multiplexer(read) mode, 1: latch(write) mode
m_ms = (state) ? 1 : 0;
}

9
src/devices/machine/tms1024.h
View File

@ -54,8 +54,8 @@ enum
A5 15 | | 26 D6
B5 16 | | 25 C6
CE: Chip Enable C5 17 | | 24 B6
MS: Master S.? D5 18 | | 23 A6
STD: STrobe Data? A2 19 | | 22 D2
MS: Mode Select D5 18 | | 23 A6
STD: STrobe Data A2 19 | | 22 D2
S: Select B2 20 |___________| 21 C2
H: Hold?
@ -81,18 +81,19 @@ public:
}
DECLARE_WRITE8_MEMBER(write_h);
DECLARE_READ8_MEMBER(read_h);
DECLARE_WRITE8_MEMBER(write_s);
DECLARE_WRITE_LINE_MEMBER(write_std);
DECLARE_READ8_MEMBER(read_h);
DECLARE_WRITE_LINE_MEMBER(write_ms);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
u8 m_h; // 4-bit data latch
u8 m_s; // 3-bit port select
u8 m_std; // strobe pin
u8 m_ms; // mode select pin, default to read mode
// callbacks
devcb_read8 m_read_port[7];

1
src/mame/drivers/hh_tms1k.cpp
View File

@ -8130,6 +8130,7 @@ void tbreakup_state::machine_reset()
{
hh_tms1k_state::machine_reset();
set_clock();
m_expander->write_ms(1); // Vss
}
void tbreakup_state::machine_start()