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Possibly controversial i2cmem change, please lemme know if something breaks (nw)

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This commit is contained in:
Olivier Galibert 2020-02-24 22:27:45 +01:00
parent 16ec14f580
commit 91c2cf74d9
1 changed files with 14 additions and 1 deletions
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15
src/devices/machine/i2cmem.cpp
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@ -344,7 +344,13 @@ WRITE_LINE_MEMBER( i2cmem_device::write_scl )
switch( m_state ) switch( m_state )
{ {
case STATE_DEVSEL: case STATE_DEVSEL:
m_devsel = m_shift; if( m_shift & 1 )
{
verboselog( this, 1, "switching to read\n");
m_devsel &= 0x0e;
m_devsel |= (m_shift & 0xf1);
}
else m_devsel = m_shift;
if( !select_device() ) if( !select_device() )
{ {
@ -507,6 +513,13 @@ int i2cmem_device::select_device()
int device = ( m_slave_address & 0xf0 ) | ( m_e2 << 3 ) | ( m_e1 << 2 ) | ( m_e0 << 1 ); int device = ( m_slave_address & 0xf0 ) | ( m_e2 << 3 ) | ( m_e1 << 2 ) | ( m_e0 << 1 );
int mask = DEVSEL_ADDRESS & ~( address_mask() >> 7 ); int mask = DEVSEL_ADDRESS & ~( address_mask() >> 7 );
if( m_devsel == 0 )
{
verboselog( this, 2, "acknowledging global call\n");
m_sdar = 0;
return 1;
}
if( ( m_devsel & mask ) == ( device & mask ) ) if( ( m_devsel & mask ) == ( device & mask ) )
{ {
return 1; return 1;