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Implemented proper FIFO read

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This commit is contained in:
Angelo Salese 2011-09-12 23:12:09 +00:00
parent 9b7d1a6d2f
commit 57116c6699
1 changed files with 42 additions and 7 deletions
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49
src/emu/video/h63484.c
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@ -16,7 +16,7 @@
// default address map
static ADDRESS_MAP_START( h63484_vram, AS_0, 8 )
AM_RANGE(0x00000, 0x7ffff) AM_RAM
AM_RANGE(0x80000, 0xbffff) AM_NOP
AM_RANGE(0x80000, 0xfffff) AM_NOP
ADDRESS_MAP_END
@ -35,7 +35,7 @@ h63484_device::h63484_device(const machine_config &mconfig, const char *tag, dev
m_param_ptr(0),
m_rwp(0),
m_rwp_dn(0),
m_space_config("videoram", ENDIANNESS_LITTLE, 8, 16, 0, NULL, *ADDRESS_MAP_NAME(h63484_vram))
m_space_config("videoram", ENDIANNESS_LITTLE, 8, 20, 0, NULL, *ADDRESS_MAP_NAME(h63484_vram))
{
m_shortname = "h63484";
}
@ -358,6 +358,26 @@ const rom_entry *h63484_device::device_rom_region() const
return ROM_NAME( h63484 );
}
//-------------------------------------------------
// readbyte - read a byte at the given address
//-------------------------------------------------
inline UINT8 h63484_device::readbyte(offs_t address)
{
return space()->read_byte(address);
}
//-------------------------------------------------
// writebyte - write a byte at the given address
//-------------------------------------------------
inline void h63484_device::writebyte(offs_t address, UINT8 data)
{
space()->write_byte(address, data);
}
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
@ -449,7 +469,7 @@ inline void h63484_device::fifo_r_clear()
inline void h63484_device::queue_r(UINT8 data)
{
if (m_fifo_ptr < 15)
if (m_fifo_r_ptr < 15)
{
m_fifo_r_ptr++;
@ -484,8 +504,8 @@ inline void h63484_device::dequeue_r(UINT8 *data)
m_sr &= ~H63484_SR_RFF;
if (m_fifo_ptr == -1)
m_sr &= H63484_SR_RFR;
if (m_fifo_r_ptr == -1)
m_sr &= ~H63484_SR_RFR;
}
}
@ -650,9 +670,10 @@ void h63484_device::process_fifo()
case COMMAND_RD:
if (m_param_ptr == 0)
{
//queue_r(h63484, h63484->space->read_byte((h63484->rwp+0) & 0xfffff));
//queue_r(h63484, h63484->space->read_byte((h63484->rwp+1) & 0xfffff));
queue_r(readbyte((m_rwp+0) & 0xfffff));
queue_r(readbyte((m_rwp+1) & 0xfffff));
m_rwp+=2;
m_rwp&=0xfffff;
command_end_seq();
}
break;
@ -694,6 +715,20 @@ READ16_MEMBER( h63484_device::data_r )
res = 0xffff;
if(m_ar == 0) // FIFO read
{
UINT8 data;
dequeue_r(&data);
res = (data & 0xff) << 8;
dequeue_r(&data);
res |= data & 0xff;
}
else
{
if(LOG) printf("%s R\n",acrtc_regnames[m_ar/2]);
}
return res;
}