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Initial ESCC emulation.

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This commit is contained in:
Maxim Poliakovski 2021-10-25 22:18:02 +02:00
parent 3f20d0a700
commit cb946e41b5
2 changed files with 223 additions and 0 deletions
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122
devices/serial/escc.cpp Normal file
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/*
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);
}
}
uint8_t EsccController::read_compat(uint8_t reg_offset)
{
switch(reg_offset) {
case Compat::EsccReg::Port_B_Cmd:
LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
this->reg_ptr = 0;
break;
case Compat::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_compat(uint8_t reg_offset, uint8_t value)
{
switch(reg_offset) {
case Compat::EsccReg::Port_B_Cmd:
this->write_internal(this->ch_b.get(), value);
break;
case Compat::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);
}

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/*
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) definitions. */
#ifndef ESCC_H
#define ESCC_H
#include <cinttypes>
#include <memory>
#include <string>
/** ESCC compatible (aka Macintosh legacy) register addressing */
namespace Compat {
enum EsccReg : uint8_t {
Port_B_Cmd = 0,
Port_A_Cmd = 1,
Port_B_Data = 2,
Port_A_Data = 3,
Enh_Reg_B = 4,
Enh_Reg_A = 5,
};
};
/** ESCC MacRISC style register addressing */
enum EsccReg : uint8_t {
Port_B_Cmd = 0,
Port_B_Data = 1,
Port_A_Cmd = 2,
Port_A_Data = 3,
Enh_Reg_B = 4,
Enh_Reg_A = 5,
};
/** LocalTalk registers (same in both addressing schemes) */
enum LocalTalkReg : uint8_t {
Rec_Count = 8,
Start_A = 9,
Start_B = 0xA,
Detect_AB = 0xB,
};
enum WR0Cmd : uint8_t {
Point_High = 1,
};
/** ESCC Channel class. */
class EsccChannel {
public:
EsccChannel(std::string name) { this->name = name; };
~EsccChannel() = default;
void write_reg(int reg_num, uint8_t value);
private:
std::string name;
uint8_t write_regs[16];
};
/** ESCC Controller class. */
class EsccController {
public:
EsccController();
~EsccController() = default;
// ESCC MacRISC registers access
uint8_t read(uint8_t reg_offset);
void write(uint8_t reg_offset, uint8_t value);
// ESCC compatible registers access
uint8_t read_compat(uint8_t reg_offset);
void write_compat(uint8_t reg_offset, uint8_t value);
private:
void write_internal(EsccChannel* ch, uint8_t value);
std::unique_ptr<EsccChannel> ch_a;
std::unique_ptr<EsccChannel> ch_b;
int reg_ptr; // register pointer for reading/writing (same for both channels)
};
#endif // ESCC_H