dingusppc/devices/serial/escc.cpp
2022-02-26 10:57:13 +01:00

91 lines
2.5 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file Enhanced Serial Communications Controller (ESCC) emulation. */
#include "escc.h"
#include <loguru.hpp>
#include <cinttypes>
#include <memory>
EsccController::EsccController()
{
this->ch_a = std::unique_ptr<EsccChannel> (new EsccChannel("A"));
this->ch_b = std::unique_ptr<EsccChannel> (new EsccChannel("B"));
this->reg_ptr = 0;
}
uint8_t EsccController::read(uint8_t reg_offset)
{
switch(reg_offset) {
case EsccReg::Port_B_Cmd:
LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
this->reg_ptr = 0;
break;
case EsccReg::Port_A_Cmd:
LOG_F(9, "ESCC: reading Port A register RR%d", this->reg_ptr);
this->reg_ptr = 0;
break;
default:
LOG_F(INFO, "ESCC: reading register %d", reg_offset);
}
return 0;
}
void EsccController::write(uint8_t reg_offset, uint8_t value)
{
switch(reg_offset) {
case EsccReg::Port_B_Cmd:
this->write_internal(this->ch_b.get(), value);
break;
case EsccReg::Port_A_Cmd:
this->write_internal(this->ch_a.get(), value);
break;
default:
LOG_F(INFO, "ESCC: writing 0x%X to register %d", value, reg_offset);
}
}
void EsccController::write_internal(EsccChannel *ch, uint8_t value)
{
if (this->reg_ptr) {
ch->write_reg(this->reg_ptr, value);
this->reg_ptr = 0;
} else {
this->reg_ptr = value & 7;
switch(value >> 3) {
case WR0Cmd::Point_High:
this->reg_ptr |= 8;
break;
}
}
}
void EsccChannel::write_reg(int reg_num, uint8_t value)
{
this->write_regs[reg_num] = value;
LOG_F(9, "ESCC: writing 0x%X to Channel %s WR%d", value, this->name.c_str(),
reg_num);
}