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upd7810: remove code duplication in ETIMER

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This commit is contained in:
Ramiro Polla 2014-10-30 16:13:19 +01:00
parent 2d4007980d
commit 6f8a6d85be
1 changed files with 30 additions and 104 deletions
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134
src/emu/cpu/upd7810/upd7810.c
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@ -1315,117 +1315,43 @@ void upd7810_device::handle_timers(int cycles)
ECNT = 0; ECNT = 0;
break; break;
} }
switch (ETMM & 0x30) /* Conditions When ECNT Causes a CO0 Output Change */
if (((0x00 == (ETMM & 0x30)) && (ETM0 == ECNT)) || /* set CO0 if ECNT == ETM0 */
/* ((0x10 == (ETMM & 0x30)) prohibited */
((0x20 == (ETMM & 0x30)) && (ETM0 == ECNT)) || /* set CO0 if ECNT == ETM0 or at falling CI input */
((0x30 == (ETMM & 0x30)) && (ETM0 == ECNT || ETM1 == ECNT))) /* latch CO0 if ECNT == ETM0 or ECNT == ETM1 */
{ {
case 0x00: /* set CO0 if ECNT == ETM0 */ switch (EOM & 0x0e)
if (ETM0 == ECNT)
{ {
switch (EOM & 0x0e) case 0x02: /* toggle CO0 */
{ CO0 = (CO0 >> 1) | ((CO0 ^ 2) & 2);
case 0x02: /* toggle CO0 */ break;
CO0 = (CO0 >> 1) | ((CO0 ^ 2) & 2); case 0x04: /* reset CO0 */
break; CO0 = 0;
case 0x04: /* reset CO0 */ break;
CO0 = 0; case 0x08: /* set CO0 */
break; CO0 = 1;
case 0x08: /* set CO0 */ break;
CO0 = 1;
break;
}
} }
break;
case 0x10: /* prohibited */
break;
case 0x20: /* set CO0 if ECNT == ETM0 or at falling CI input */
if (ETM0 == ECNT)
{
switch (EOM & 0x0e)
{
case 0x02: /* toggle CO0 */
CO0 = (CO0 >> 1) | ((CO0 ^ 2) & 2);
break;
case 0x04: /* reset CO0 */
CO0 = 0;
break;
case 0x08: /* set CO0 */
CO0 = 1;
break;
}
}
break;
case 0x30: /* latch CO0 if ECNT == ETM0 or ECNT == ETM1 */
if (ETM0 == ECNT || ETM1 == ECNT)
{
switch (EOM & 0x0e)
{
case 0x02: /* toggle CO0 */
CO0 = (CO0 >> 1) | ((CO0 ^ 2) & 2);
break;
case 0x04: /* reset CO0 */
CO0 = 0;
break;
case 0x08: /* set CO0 */
CO0 = 1;
break;
}
}
break;
} }
switch (ETMM & 0xc0) /* Conditions When ECNT Causes a CO1 Output Change */
if (((0x00 == (ETMM & 0xc0)) && (ETM0 == ECNT)) || /* set CO1 if ECNT == ETM0 */
/* ((0x40 == (ETMM & 0xc0)) prohibited */
((0x80 == (ETMM & 0xc0)) && (ETM0 == ECNT)) || /* set CO1 if ECNT == ETM0 or at falling CI input */
((0xc0 == (ETMM & 0xc0)) && (ETM0 == ECNT || ETM1 == ECNT))) /* latch CO1 if ECNT == ETM0 or ECNT == ETM1 */
{ {
case 0x00: /* lacth CO1 if ECNT == ETM1 */ switch (EOM & 0xe0)
if (ETM1 == ECNT)
{ {
switch (EOM & 0xe0) case 0x20: /* toggle CO1 */
{ CO1 = (CO1 >> 1) | ((CO1 ^ 2) & 2);
case 0x20: /* toggle CO1 */ break;
CO1 = (CO1 >> 1) | ((CO1 ^ 2) & 2); case 0x40: /* reset CO1 */
break; CO1 = 0;
case 0x40: /* reset CO1 */ break;
CO1 = 0; case 0x80: /* set CO1 */
break; CO1 = 1;
case 0x80: /* set CO1 */ break;
CO1 = 1;
break;
}
} }
break;
case 0x40: /* prohibited */
break;
case 0x80: /* latch CO1 if ECNT == ETM1 or falling edge of CI input */
if (ETM1 == ECNT)
{
switch (EOM & 0xe0)
{
case 0x20: /* toggle CO1 */
CO1 = (CO1 >> 1) | ((CO1 ^ 2) & 2);
break;
case 0x40: /* reset CO1 */
CO1 = 0;
break;
case 0x80: /* set CO1 */
CO1 = 1;
break;
}
}
break;
case 0xc0: /* latch CO1 if ECNT == ETM0 or ECNT == ETM1 */
if (ETM0 == ECNT || ETM1 == ECNT)
{
switch (EOM & 0xe0)
{
case 0x20: /* toggle CO1 */
CO1 = (CO1 >> 1) | ((CO1 ^ 2) & 2);
break;
case 0x40: /* reset CO1 */
CO1 = 0;
break;
case 0x80: /* set CO1 */
CO1 = 1;
break;
}
}
break;
} }
} }
} }