void bitbanger_device::set_input_line(UINT8 line)
{
/* normalize */
line = line ? ASSERT_LINE : CLEAR_LINE;
/* only act when the state changes */
if (m_current_input != line)
{
m_current_input = line;
if (!m_input_callback.isnull())
{
m_input_callback(line ? ASSERT_LINE : CLEAR_LINE);
}
}
}
UINT8 adc083x_device::conversion()
{
int result;
int positive_channel = ADC083X_AGND;
int negative_channel = ADC083X_AGND;
double positive = 0;
double negative = 0;
double gnd = m_input_callback( this, ADC083X_AGND );
double vref = m_input_callback( this, ADC083X_VREF );
if( type() == ADC0831 )
{
positive_channel = ADC083X_CH0;
negative_channel = ADC083X_CH1;
}
else if( type() == ADC0832 )
{
positive_channel = ADC083X_CH0 + m_odd;
if( m_sgl == 0 )
{
negative_channel = positive_channel ^ 1;
}
else
{
negative_channel = ADC083X_AGND;
}
}
else if( type() == ADC0834 )
{
positive_channel = ADC083X_CH0 + m_odd + ( m_sel1 * 2 );
if( m_sgl == 0 )
{
negative_channel = positive_channel ^ 1;
}
else
{
negative_channel = ADC083X_AGND;
}
}
else if( type() == ADC0838 )
{
positive_channel = ADC083X_CH0 + m_odd + ( m_sel0 * 2 ) + ( m_sel1 * 4 );
if( m_sgl == 0 )
{
negative_channel = positive_channel ^ 1;
}
else
{
negative_channel = ADC083X_COM;
}
}
if( positive_channel != ADC083X_AGND )
{
positive = m_input_callback( this, positive_channel ) - gnd;
}
if( negative_channel != ADC083X_AGND )
{
negative = m_input_callback( this, negative_channel ) - gnd;
}
result = (int) ( ( ( positive - negative ) * 255 ) / vref );
if( result < 0 )
{
result = 0;
}
else if( result > 255 )
{
result = 255;
}
return result;
}
