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hankin.c : redo volume control code

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This commit is contained in:
Robbbert 2014-08-25 09:25:43 +00:00
parent d6a7cff49d
commit a9be44fa8a
1 changed files with 13 additions and 3 deletions
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16
src/mame/drivers/hankin.c
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@ -430,7 +430,7 @@ TIMER_DEVICE_CALLBACK_MEMBER( hankin_state::timer_s )
{
m_timer_s[2]++;
offs_t offs = (m_timer_s[2] & 31) | (m_ic2a << 5);
m_dac->write_unsigned8(m_p_prom[offs]<< m_vol);
m_dac->write_unsigned8(m_p_prom[offs]<< 4);
}
else
m_timer_s[2] = 0;
@ -441,6 +441,7 @@ TIMER_DEVICE_CALLBACK_MEMBER( hankin_state::timer_s )
void hankin_state::machine_reset()
{
m_p_prom = memregion("roms")->base() + 0x1800;
m_vol = 0;
}
// PA0-3 = sound data from main cpu
@ -454,7 +455,7 @@ WRITE8_MEMBER( hankin_state::ic2_a_w )
{
m_ic2a = data >> 4;
offs_t offs = (m_timer_s[2] & 31) | (m_ic2a << 5);
m_dac->write_unsigned8(m_p_prom[offs]<< m_vol);
m_dac->write_unsigned8(m_p_prom[offs]<< 4);
}
// PB0-3 = preset on 74LS161
@ -462,7 +463,16 @@ WRITE8_MEMBER( hankin_state::ic2_a_w )
WRITE8_MEMBER( hankin_state::ic2_b_w )
{
m_ic2b = data;
m_vol = (m_ic2b & 0xf0) / 50; // 0 to 4
data >>= 4;
if (data != m_vol)
{
m_vol = data;
float vol = m_vol/16.666+0.1;
m_dac->set_output_gain(0, vol);
}
}
// low to divide 555 by 2