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barcrest/mpu4.cpp: Fixed regression for games using sampled sound. [James Wallace]

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This commit is contained in:
Vas Crabb 2022-11-29 16:09:59 +11:00
parent 78599e367c
commit 7f1fa1f226
2 changed files with 26 additions and 26 deletions
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24
src/mame/barcrest/mpu4.cpp
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@ -225,6 +225,8 @@ To change between them, follow these instructions:
#include "mpu4.lh" #include "mpu4.lh"
#include "mpu4ext.lh" #include "mpu4ext.lh"
#include <cmath>
/* /*
LED Segments related to pins (5 is not connected): LED Segments related to pins (5 is not connected):
@ -302,10 +304,10 @@ void mpu4_state::lamp_extend_large(uint8_t data, uint8_t column, bool active)
} }
} }
void mpu4_state::led_write_extender(uint8_t latch, uint8_t data, uint8_t starting_column) void mpu4_state::led_write_extender(uint8_t latch, uint8_t data, uint8_t column)
{ {
const uint8_t diff = (latch ^ m_last_latch) & latch; const uint8_t diff = (latch ^ m_last_latch) & latch;
const uint8_t ext_strobe = (7 - starting_column) * 8; const uint8_t ext_strobe = (7 - column) * 8;
data = ~data;//invert drive lines data = ~data;//invert drive lines
for (int i = 0; i < 5; i++) for (int i = 0; i < 5; i++)
@ -383,7 +385,7 @@ void mpu4_state::update_meters()
break; break;
} }
m_meters->update(7, (data & 0x80)); m_meters->update(7, data & 0x80);
for (int meter = 0; meter < 4; meter++) for (int meter = 0; meter < 4; meter++)
{ {
@ -817,7 +819,6 @@ void mpu4_state::pia_ic5_porta_w(uint8_t data)
{ {
m_mpu4leds[((m_input_strobe | 8) << 3) | i] = BIT(data, i); m_mpu4leds[((m_input_strobe | 8) << 3) | i] = BIT(data, i);
} }
// m_digits[m_input_strobe | 8] = data;
} }
break; break;
@ -1023,7 +1024,7 @@ void mpu4_state::pia_ic6_porta_w(uint8_t data)
if (m_ay8913.found()) if (m_ay8913.found())
{ {
m_ay_data = data; m_ay_data = data;
update_ay();// update_ay();
} }
} }
@ -1035,7 +1036,7 @@ WRITE_LINE_MEMBER(mpu4_state::pia_ic6_ca2_w)
{ {
if ( state ) m_ay8913_address |= 0x01; if ( state ) m_ay8913_address |= 0x01;
else m_ay8913_address &= ~0x01; else m_ay8913_address &= ~0x01;
update_ay();// update_ay();
} }
} }
@ -1104,7 +1105,7 @@ uint8_t mpu4_state::pia_ic7_portb_r()
all eight meters are driven from this port, giving the 8 line driver chip all eight meters are driven from this port, giving the 8 line driver chip
9 connections in total. */ 9 connections in total. */
//This may be overkill, but the meter sensing is VERY picky //This may be overkill, but the meter sensing is VERY picky.
uint8_t combined_meter = m_meters->get_activity(0) | m_meters->get_activity(1) | uint8_t combined_meter = m_meters->get_activity(0) | m_meters->get_activity(1) |
m_meters->get_activity(2) | m_meters->get_activity(3) | m_meters->get_activity(2) | m_meters->get_activity(3) |
@ -1244,7 +1245,7 @@ uint8_t mpu4_state::pia_gb_portb_r()
if ( m_msm6376->busy_r() ) data |= 0x40; if ( m_msm6376->busy_r() ) data |= 0x40;
else data &= ~0x40; else data &= ~0x40;
return ( data | m_expansion_latch ); return data | m_expansion_latch;
} }
WRITE_LINE_MEMBER(mpu4_state::pia_gb_ca2_w) WRITE_LINE_MEMBER(mpu4_state::pia_gb_ca2_w)
@ -1299,11 +1300,10 @@ void mpu4_state::ic3ss_w(offs_t offset, uint8_t data)
m_t3l = data; m_t3l = data;
} }
float num = (1720000/((m_t3l + 1)*(m_t3h + 1))); float const num = float(1'720'000) / ((m_t3l + 1) * (m_t3h + 1));
float denom1 = ((m_t3h *(m_t3l + 1)+ 1)/(2*(m_t1 + 1))); float const denom = std::ceil(float(m_t3h * (m_t3l + 1) + 1) / (2 * (m_t1 + 1))); //need to round up, this gives same precision as chip
uint8_t denom2 = denom1 + 0.5f;//need to round up, this gives same precision as chip int const freq = int(num * denom);
uint8_t freq=num*denom2;
if (freq) if (freq)
{ {