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[Core/CD] improved accuracy of CDC data transfer to Main-CPU and Sub-CPU when writing to CDC data register (verified on real hardware, cf. Krikzz's mcd-verificator)

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ekeeke 2024-01-22 01:02:42 +01:00
parent 2c1a2d0def
commit 64d3e08e7d
5 changed files with 14 additions and 0 deletions
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7
core/cd_hw/scd.c
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@ -1405,6 +1405,13 @@ static void scd_write_word(unsigned int address, unsigned int data)
return; return;
} }
case 0x08: /* CDC host data */
{
/* CDC data is also read (although unused) on write access (verified on real hardware, cf. Krikzz's mcd-verificator) */
cdc_host_r(CDC_SUB_CPU_ACCESS);
return;
}
case 0x0c: /* Stopwatch (word access only) */ case 0x0c: /* Stopwatch (word access only) */
{ {
/* synchronize the counter with SUB-CPU */ /* synchronize the counter with SUB-CPU */

7
core/mem68k.c
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@ -1261,6 +1261,13 @@ void ctrl_io_write_word(unsigned int address, unsigned int data)
return; return;
} }
case 0x08: /* CDC host data */
{
/* CDC data is also read (although unused) on write access (verified on real hardware, cf. Krikzz's mcd-verificator) */
cdc_host_r(CDC_MAIN_CPU_ACCESS);
return;
}
case 0x0e: /* CPU communication flags */ case 0x0e: /* CPU communication flags */
{ {
m68k_poll_sync(1<<0x0e); m68k_poll_sync(1<<0x0e);