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(MESS) microvsn.c: Added 'holding latches' and updated drawing code to refresh the screen contents from these holding latches. Fixes the american flag when starting sea duel. (nw)

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This commit is contained in:
Wilbert Pol 2014-03-24 21:57:36 +00:00
parent 7a135e058a
commit 5b375bb60a
1 changed files with 30 additions and 17 deletions
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47
src/mess/drivers/microvsn.c
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@ -102,11 +102,13 @@ protected:
UINT16 m_o;
// generic variables
void update_lcd();
void lcd_write(UINT8 control, UINT8 data);
void speaker_write(UINT8 speaker);
bool m_pla;
UINT8 m_lcd_latch[8];
UINT8 m_lcd_holding_latch[8];
UINT8 m_lcd_latch_index;
UINT8 m_lcd[16][16];
UINT8 m_lcd_control_old;
@ -148,6 +150,7 @@ MACHINE_START_MEMBER(microvision_state, microvision)
save_item(NAME(m_lcd));
save_item(NAME(m_lcd_control_old));
save_item(NAME(m_pla));
save_item(NAME(m_lcd_holding_latch));
}
@ -205,6 +208,29 @@ MACHINE_RESET_MEMBER(microvision_state, microvision)
}
void microvision_state::update_lcd()
{
UINT16 row = ( m_lcd_holding_latch[0] << 12 ) | ( m_lcd_holding_latch[1] << 8 ) | ( m_lcd_holding_latch[2] << 4 ) | m_lcd_holding_latch[3];
UINT16 col = ( m_lcd_holding_latch[4] << 12 ) | ( m_lcd_holding_latch[5] << 8 ) | ( m_lcd_holding_latch[6] << 4 ) | m_lcd_holding_latch[7];
if (LOG) logerror("row = %04x, col = %04x\n", row, col );
for ( int i = 0; i < 16; i++ )
{
UINT16 temp = row;
for ( int j = 0; j < 16; j++ )
{
if ( ( temp & col ) & 0x8000 )
{
m_lcd[j][i] = 15;
}
temp <<= 1;
}
col <<= 1;
}
}
UINT32 microvision_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for ( UINT8 i = 0; i < 16; i++ )
@ -233,6 +259,7 @@ void microvision_state::screen_vblank(screen_device &screen, bool state)
}
}
}
update_lcd();
}
}
@ -270,24 +297,10 @@ void microvision_state::lcd_write(UINT8 control, UINT8 data)
// A parallel transfer of data from the addressed latches to the holding latches occurs
// whenever Latch Pulse is high and -Data Clk is high
if ( control == 3 ) {
UINT16 row = ( m_lcd_latch[0] << 12 ) | ( m_lcd_latch[1] << 8 ) | ( m_lcd_latch[2] << 4 ) | m_lcd_latch[3];
UINT16 col = ( m_lcd_latch[4] << 12 ) | ( m_lcd_latch[5] << 8 ) | ( m_lcd_latch[6] << 4 ) | m_lcd_latch[7];
if (LOG) logerror("row = %04x, col = %04x\n", row, col );
for ( int i = 0; i < 16; i++ )
{
UINT16 temp = row;
for ( int j = 0; j < 16; j++ )
{
if ( ( temp & col ) & 0x8000 )
{
m_lcd[j][i] = 15;
}
temp <<= 1;
}
col <<= 1;
for ( int i = 0; i < 8; i++ ) {
m_lcd_holding_latch[i] = m_lcd_latch[i];
}
update_lcd();
}
m_lcd_control_old = control;