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mcs51 (i8051), add random number stuff to ds5002fp [Haze]

This commit is contained in:
dinkc64 2021-12-14 20:17:55 -05:00
parent 052c818327
commit ba8dfe8bb7
1 changed files with 26 additions and 3 deletions
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29
src/cpu/i8051/mcs51.cpp
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@ -297,6 +297,7 @@ struct _mcs51_state_t
UINT8 previous_ta; /* Previous Timed Access value */
UINT8 ta_window; /* Limed Access window */
UINT8 range; /* Memory Range */
INT32 rnr_delay; /* delay before new random number available */
ds5002fp_config config; /* Bootstrap Configuration */
} ds5002fp;
@ -2071,9 +2072,13 @@ INT32 mcs51Run(int cycles) // divide cycles by 12! -dink
burn_cycles(mcs51_state->inst_cycles);
/* decrement the timed access window */
if (mcs51_state->features & FEATURE_DS5002FP)
if (mcs51_state->features & FEATURE_DS5002FP) {
mcs51_state->ds5002fp.ta_window = (mcs51_state->ds5002fp.ta_window ? (mcs51_state->ds5002fp.ta_window - 1) : 0x00);
if (mcs51_state->ds5002fp.rnr_delay > 0)
mcs51_state->ds5002fp.rnr_delay-=mcs51_state->inst_cycles;
}
/* If the chip entered in idle mode, end the loop */
if ((mcs51_state->features & FEATURE_CMOS) && GET_IDL)
goto endit;
@ -2123,6 +2128,10 @@ void mcs51_scan(INT32 nAction)
ba.nLen = STRUCT_SIZE_HELPER(struct _mcs51_state_t, ds5002fp);
ba.szName = "i8051 Regs";
BurnAcb(&ba);
if (mcs51_state_store[i].features & FEATURE_DS5002FP) {
BurnRandomScan(nAction); // ds5002fp
}
}
}
}
@ -2341,6 +2350,7 @@ void mcs51_reset (void)
mcs51_state->ds5002fp.previous_ta = 0;
mcs51_state->ds5002fp.ta_window = 0;
mcs51_state->ds5002fp.range = (GET_RG1 << 1) | GET_RG0;
mcs51_state->ds5002fp.rnr_delay = 160;
}
}
@ -2410,6 +2420,17 @@ static void ds5002fp_sfr_write(INT32 offset, UINT8 data)
//mcs51_state->data->write_byte((INT32) offset | 0x100, data);
}
static UINT8 ds5002fp_handle_rnr()
{
if (mcs51_state->ds5002fp.rnr_delay <= 0)
{
mcs51_state->ds5002fp.rnr_delay = 160; // delay before another random number can be read
return BurnRandom();
}
else
return 0x00;
}
static UINT8 ds5002fp_sfr_read(INT32 offset)
{
switch (offset)
@ -2419,8 +2440,10 @@ static UINT8 ds5002fp_sfr_read(INT32 offset)
case ADDR_CRCH: DS5_LOGR(CRCH, data); break;
case ADDR_MCON: DS5_LOGR(MCON, data); break;
case ADDR_TA: DS5_LOGR(TA, data); break;
case ADDR_RNR: DS5_LOGR(RNR, data); break;
case ADDR_RPCTL: DS5_LOGR(RPCTL, data); return 0x80; break; // 7/17/17 fix touchgo
case ADDR_RNR: DS5_LOGR(RNR, data);
return ds5002fp_handle_rnr();
case ADDR_RPCTL: DS5_LOGR(RPCTL, data);
return (mcs51_state->ds5002fp.rnr_delay <= 0) ? 0x80 : 0x00;
case ADDR_RPS: DS5_LOGR(RPS, data); break;
case ADDR_PCON:
SET_PFW(0); /* reset PFW flag */