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Fix upd7810 serial input failing to detect the start bit of the next byte if there are zero serial idle state bits sent between the serial bytes to the upd7810 receive line. [Lord Nightmare]

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This commit is contained in:
Lord-Nightmare 2023-02-02 16:36:23 -05:00
parent 43e30203bd
commit c056522aab
1 changed files with 14 additions and 1 deletions
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15
src/devices/cpu/upd7810/upd7810.cpp
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@ -1113,6 +1113,7 @@ void upd7810_device::upd7810_sio_input()
case 0x48: /* 7bits, no parity, 1 stop bit */
case 0x68: /* 7bits, no parity, 1 stop bit (parity select = 1 but parity is off) */
m_rxs >>= 16 - 9;
m_rxs |= ~0 << 9;
RXB = (m_rxs >> 1) & 0x7f;
if ((1 << 8) != (m_rxs & (1 | (1 << 8))))
IRR |= INTER; /* framing error */
@ -1120,12 +1121,14 @@ void upd7810_device::upd7810_sio_input()
case 0x4c: /* 8bits, no parity, 1 stop bit */
case 0x6c: /* 8bits, no parity, 1 stop bit (parity select = 1 but parity is off) */
m_rxs >>= 16 - 10;
m_rxs |= ~0 << 10;
RXB = (m_rxs >> 1) & 0xff;
if ((1 << 9) != (m_rxs & (1 | (1 << 9))))
IRR |= INTER; /* framing error */
break;
case 0x58: /* 7bits, odd parity, 1 stop bit */
m_rxs >>= 16 - 10;
m_rxs |= ~0 << 10;
RXB = (m_rxs >> 1) & 0x7f;
if ((1 << 9) != (m_rxs & (1 | (1 << 9))))
IRR |= INTER; /* framing error */
@ -1134,6 +1137,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0x5c: /* 8bits, odd parity, 1 stop bit */
m_rxs >>= 16 - 11;
m_rxs |= ~0 << 11;
RXB = (m_rxs >> 1) & 0xff;
if ((1 << 10) != (m_rxs & (1 | (1 << 10))))
IRR |= INTER; /* framing error */
@ -1142,6 +1146,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0x78: /* 7bits, even parity, 1 stop bit */
m_rxs >>= 16 - 10;
m_rxs |= ~0 << 10;
RXB = (m_rxs >> 1) & 0x7f;
if ((1 << 9) != (m_rxs & (1 | (1 << 9))))
IRR |= INTER; /* framing error */
@ -1150,6 +1155,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0x7c: /* 8bits, even parity, 1 stop bit */
m_rxs >>= 16 - 11;
m_rxs |= ~0 << 11;
RXB = (m_rxs >> 1) & 0xff;
if ((1 << 10) != (m_rxs & (1 | (1 << 10))))
IRR |= INTER; /* framing error */
@ -1159,6 +1165,7 @@ void upd7810_device::upd7810_sio_input()
case 0xc8: /* 7bits, no parity, 2 stop bits */
case 0xe8: /* 7bits, no parity, 2 stop bits (parity select = 1 but parity is off) */
m_rxs >>= 16 - 10;
m_rxs |= ~0 << 10;
RXB = (m_rxs >> 1) & 0x7f;
if ((3 << 9) != (m_rxs & (1 | (3 << 9))))
IRR |= INTER; /* framing error */
@ -1168,6 +1175,7 @@ void upd7810_device::upd7810_sio_input()
case 0xcc: /* 8bits, no parity, 2 stop bits */
case 0xec: /* 8bits, no parity, 2 stop bits (parity select = 1 but parity is off) */
m_rxs >>= 16 - 11;
m_rxs |= ~0 << 11;
RXB = (m_rxs >> 1) & 0xff;
if ((3 << 10) != (m_rxs & (1 | (3 << 10))))
IRR |= INTER; /* framing error */
@ -1176,6 +1184,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0xd8: /* 7bits, odd parity, 2 stop bits */
m_rxs >>= 16 - 11;
m_rxs |= ~0 << 11;
RXB = (m_rxs >> 1) & 0x7f;
if ((3 << 10) != (m_rxs & (1 | (3 << 10))))
IRR |= INTER; /* framing error */
@ -1184,6 +1193,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0xdc: /* 8bits, odd parity, 2 stop bits */
m_rxs >>= 16 - 12;
m_rxs |= ~0 << 12;
RXB = (m_rxs >> 1) & 0xff;
if ((3 << 11) != (m_rxs & (1 | (3 << 11))))
IRR |= INTER; /* framing error */
@ -1192,6 +1202,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0xf8: /* 7bits, even parity, 2 stop bits */
m_rxs >>= 16 - 11;
m_rxs |= ~0 << 11;
RXB = (m_rxs >> 1) & 0x7f;
if ((3 << 10) != (m_rxs & (1 | (3 << 10))))
IRR |= INTER; /* framing error */
@ -1200,6 +1211,7 @@ void upd7810_device::upd7810_sio_input()
break;
case 0xfc: /* 8bits, even parity, 2 stop bits */
m_rxs >>= 16 - 12;
m_rxs |= ~0 << 12;
RXB = (m_rxs >> 1) & 0xff;
if ((3 << 11) != (m_rxs & (1 | (3 << 11))))
IRR |= INTER; /* framing error */
@ -1211,6 +1223,7 @@ void upd7810_device::upd7810_sio_input()
else
{
m_rxs >>= 16 - 8;
m_rxs |= ~0 << 8;
RXB = m_rxs;
// m_rxcnt = 8;
}
@ -1870,7 +1883,7 @@ void upd7810_device::device_reset()
m_int2 = 1; // physical (inverted) INT2 line state
m_txs = 0;
m_rxs = 0;
m_rxs = ~0;
m_txcnt = 0;
m_rxcnt = 0;
m_txbuf = 0;