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escc: Implement RR8 and WR8.

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Normally, the Port_B_Data or Port_A_Data address is used to directly access RR8 or WR8, but setting the register pointer in Port_B_Cmd or Port_A_Cmd to RR8/WR8 is another option.
Update write_regs[WR8] and read_regs[RR8] for possible debugging purposes.
This commit is contained in:
joevt 2024-04-26 20:26:47 -07:00 committed by dingusdev
parent b60d3061b7
commit 941a405cf8
1 changed files with 8 additions and 0 deletions
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8
devices/serial/escc.cpp
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@ -283,6 +283,9 @@ void EsccChannel::write_reg(int reg_num, uint8_t value)
return;
}
break;
case WR8:
this->send_byte(value);
return;
case WR14:
switch (value & WR14_DPLL_COMMAND_BITS) {
case WR14_DPLL_NULL_COMMAND:
@ -330,6 +333,9 @@ uint8_t EsccChannel::read_reg(int reg_num)
if (this->chario->rcv_char_available()) {
this->read_regs[RR0] |= RR0_RX_CHARACTER_AVAILABLE;
}
break;
case RR8:
return this->receive_byte();
}
return this->read_regs[reg_num];
}
@ -338,6 +344,7 @@ void EsccChannel::send_byte(uint8_t value)
{
// TODO: put one byte into the Data FIFO
this->write_regs[WR8] = value;
this->chario->xmit_char(value);
}
@ -353,6 +360,7 @@ uint8_t EsccChannel::receive_byte()
c = 0;
}
this->read_regs[RR0] &= ~RR0_RX_CHARACTER_AVAILABLE;
this->read_regs[RR8] = c;
return c;
}