Omega3/RTC.cpp at main · h5n1xp/Omega3 · GitHub

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//
//  RTC.cpp
//  SDL3Test
//
//  Created by Matt Parsons on 24/03/2026.
//

#include "RTC.hpp"


void RTC::Init(uint32_t bas, uint8_t* dat, int siz){
}


uint32_t RTC::Read8(uint32_t address){
    return ReadBatClock(address);
}
uint32_t RTC::Read16(uint32_t address){
    return ReadBatClock(address);
}
uint32_t RTC::Read32(uint32_t address){
    return 0;
}


void RTC::Write8(uint32_t address, uint32_t value){
    SetBatClock(address, value);
    return;
}
void RTC::Write16(uint32_t address, uint32_t value){
    return;
}
void RTC::Write32(uint32_t address, uint32_t value){
    return;
}


int RTC::BCDLower(int value){
    int tens = value / 10;
    return value - (tens * 10);
}

int RTC::BCDUpper(int value){
    return value / 10;
}

void RTC::SetBatClock(uint32_t address,uint8_t value){
    //printf("Write: %d - Battery RTC (Reg: 0x%X): 0x%X : %d\n", size,(address & 0x3F) >> 2 , address, value);


    int index = address >> 2;
    index &=0xF;

    if(index==0xd){

        //Snapshot clock
        if(value & 1){
            time(&batClockRawtime);
            batClockInfo = localtime(&batClockRawtime);
            batClockInfo->tm_mon += 1;

            RTC[0] = BCDLower(batClockInfo->tm_sec);
            RTC[1] =  BCDUpper(batClockInfo->tm_sec);
            RTC[2] =  BCDLower(batClockInfo->tm_min);
            RTC[3] =  BCDUpper(batClockInfo->tm_min);
            RTC[4] =  BCDLower(batClockInfo->tm_hour);
            RTC[5] =  BCDUpper(batClockInfo->tm_hour);
            RTC[6] =  BCDLower(batClockInfo->tm_mday);
            RTC[7] =  BCDUpper(batClockInfo->tm_mday);
            RTC[8] =  BCDLower(batClockInfo->tm_mon);
            RTC[9] =  BCDUpper(batClockInfo->tm_mon);
            RTC[10] =  BCDLower(batClockInfo->tm_year);
            RTC[11] =  BCDUpper(batClockInfo->tm_year);
            RTC[12] =  batClockInfo->tm_wday;
        }


    }


    RTC[index] = value;


}

int RTC::ReadBatClock(uint32_t address){
    //printf("Read: %d - Battery RTC (Reg: 0x%X): 0x%X :: %d\n", size, (address & 0x3F) >> 2  ,address, RAM24bit[address]);


    int index = address >> 2;
    index &=0xF;

    if(RTC[0xD] & 1){
        return RTC[index];
    }

    time(&batClockRawtime);
    batClockInfo = localtime(&batClockRawtime);
    batClockInfo->tm_mon += 1;


    switch(index){
        case 0:
            return BCDLower(batClockInfo->tm_sec);
            break;
        case 1:
            return BCDUpper(batClockInfo->tm_sec);
            break;
        case 2:
            return BCDLower(batClockInfo->tm_min);
            break;
        case 3:
            return BCDUpper(batClockInfo->tm_min);
            break;
        case 4:
            return BCDLower(batClockInfo->tm_hour);
            break;
        case 5:
            return BCDUpper(batClockInfo->tm_hour);
            break;
        case 6:
            return BCDLower(batClockInfo->tm_mday);
            break;
        case 7:
            return BCDUpper(batClockInfo->tm_mday);
            break;
        case 8:
            return BCDLower(batClockInfo->tm_mon);
            break;
        case 9:
            return BCDUpper(batClockInfo->tm_mon);
            break;
        case 10:
            return BCDLower(batClockInfo->tm_year);
            break;
        case 11:
            return BCDUpper(batClockInfo->tm_year);
            break;
        case 12:
            return batClockInfo->tm_wday;
            break;
        case 13:
            return RTC[13];
            break;
        case 14:
            return RTC[14];
            break;
        case 15:
            return RTC[15];
            break;
    }
    return 0;

}