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z80scc: implement local loopback

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This commit is contained in:
Patrick Mackinlay 2021-05-24 12:30:06 +07:00
parent 646938cf96
commit 8a2de2875a
1 changed files with 7 additions and 0 deletions
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7
src/devices/machine/z80scc.cpp
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@ -1243,6 +1243,9 @@ void z80scc_channel::tra_callback()
LOGTX("%s: transmit data bit %d m_wr5:%02x\n", FUNCNAME, db, m_wr5); LOGTX("%s: transmit data bit %d m_wr5:%02x\n", FUNCNAME, db, m_wr5);
// transmit data // transmit data
out_txd_cb(db); out_txd_cb(db);
if (m_wr14 & WR14_LOCAL_LOOPBACK)
write_rx(db);
} }
else else
{ {
@ -2298,6 +2301,10 @@ void z80scc_channel::do_sccreg_wr14(uint8_t data)
m_brg_counter = 0; m_brg_counter = 0;
#endif #endif
} }
if (!(m_wr14 & WR14_LOCAL_LOOPBACK) && (data & WR14_LOCAL_LOOPBACK))
receive_register_reset();
// TODO: Add info on the other bits of this register // TODO: Add info on the other bits of this register
m_wr14 = data; m_wr14 = data;
update_serial(); update_serial();