dingusppc/macioserial.cpp

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//DingusPPC - Prototype 5bf2
//Written by divingkatae
//(c)2018-20 (theweirdo)
//Please ask for permission
//if you want to distribute this.
//(divingkatae#1017 on Discord)
//Functionality for the Serial Ports
// Based on the Zilog Z8530 SCC chip
#include <iostream>
#include <cinttypes>
#include "macioserial.h"
#include "ppcemumain.h"
uint32_t mac_serial_address;
uint8_t serial_write_byte;
uint8_t serial_read_byte;
bool w7_prime;
void mac_serial_init(){
machine_iocontrolmem_mem[0x3013004] = 0x04;
machine_iocontrolmem_mem[0x3013009] = 0xC0;
machine_iocontrolmem_mem[0x301300B] = 0x08;
machine_iocontrolmem_mem[0x301300E] = 0x30;
machine_iocontrolmem_mem[0x301300F] = 0xF8;
machine_iocontrolmem_mem[0x3013010] = 0x44;
machine_iocontrolmem_mem[0x3013011] = 0x06;
}
void mac_serial_read(){
if (mac_serial_address >=0x3013020){
mac_serial_address -= 0x20;
}
if (w7_prime){
if (((machine_iocontrolmem_mem[0x301301F] >> 2) & 0x1) & ((machine_iocontrolmem_mem[0x3013007] >> 6) & 0x1)){
switch(mac_serial_address){
case 0x14: case 0x15:
serial_read_byte = machine_iocontrolmem_mem[(mac_serial_address - 0x10)];
break;
case 0x19:
serial_read_byte = machine_iocontrolmem_mem[0x3];
break;
case 0x1B:
serial_read_byte = machine_iocontrolmem_mem[0x10];
break;
case 0x1E:
serial_read_byte = machine_iocontrolmem_mem[0x07];
break;
default:
serial_read_byte = machine_iocontrolmem_mem[mac_serial_address];
break;
}
}
}
else{
if ((machine_iocontrolmem_mem[0x301300F] >> 2) & 0x1){
switch(mac_serial_address){
case 0x14: case 0x15:
serial_read_byte = machine_iocontrolmem_mem[(mac_serial_address - 4)];
break;
case 0x19: case 0x1B:
serial_read_byte = machine_iocontrolmem_mem[(mac_serial_address + 4)];
break;
default:
serial_read_byte = machine_iocontrolmem_mem[mac_serial_address];
break;
}
}
else {
switch(mac_serial_address){
case 0x14: case 0x15: case 0x16: case 0x17:
serial_read_byte = machine_iocontrolmem_mem[(mac_serial_address - 4)];
case 0x19: case 0x1B:
serial_read_byte = machine_iocontrolmem_mem[(mac_serial_address + 4)];
break;
default:
serial_read_byte = machine_iocontrolmem_mem[mac_serial_address];
break;
}
}
}
}
void mac_serial_write(){
if (mac_serial_address >=0x3013020){
mac_serial_address -= 0x20;
}
machine_iocontrolmem_mem[mac_serial_address] = serial_write_byte;
if ((machine_iocontrolmem_mem[0x0F]) & 0x1){
w7_prime = true;
}
else{
w7_prime = false;
}
machine_iocontrolmem_mem[(mac_serial_address + 0x10)] = machine_iocontrolmem_mem[mac_serial_address];
}