Datum und Uhrzeit aus CMOS auslesen


  • Mod

    PrettyOS liest nun testweise auch Datum und Uhrzeit via CMOS. Modul: cmos.c

    void cmos_time()
    {
        // sourcecode of "Cuervo" and "ehenkes", PrettyOS team
    
        uint8_t seconds    = PackedBCD2Decimal(cmos_read(0x00));
        uint8_t minutes    = PackedBCD2Decimal(cmos_read(0x02));
        uint8_t hour       = PackedBCD2Decimal(cmos_read(0x04));
        uint8_t weekday    = PackedBCD2Decimal(cmos_read(0x06));
        uint8_t dayofmonth = PackedBCD2Decimal(cmos_read(0x07));
        uint8_t month      = PackedBCD2Decimal(cmos_read(0x08));
        uint8_t year       = PackedBCD2Decimal(cmos_read(0x09));
    
        // weekday
        switch (weekday)
        {
            case 1:
                printformat("Sunday, ");
            break;
            case 2:
                printformat("Monday, ");
            break;
            case 3:
                printformat("Tuesday, ");
            break;
            case 4:
                printformat("Wednesday, ");
            break;
            case 5:
                printformat("Thursday, ");
            break;
            case 6:
                printformat("Friday, ");
            break;
            case 7:
                printformat("Saturday, ");
            break;
            default:
                printformat("Unknown Day: %d!",weekday);
        }
    
        // month
        switch (month)
        {
            case 1:
                printformat("January ");
            break;
            case 2:
                printformat("February ");
            break;
            case 3:
                printformat("March ");
            break;
            case 4:
                printformat("April ");
            break;
            case 5:
                printformat("May ");
            break;
            case 6:
                printformat("June ");
            break;
            case 7:
                printformat("July ");
            break;
            case 8:
                printformat("August ");
            break;
            case 9:
                printformat("September ");
            break;
            case 10:
                printformat("October ");
            break;
            case 11:
                printformat("November ");
            break;
            case 12:
                printformat("December ");
            break;
            default:
                printformat("Unknown month: %d",month);
        }
    
        // day
        if(dayofmonth<10)
        {
            printformat("0%d, ",dayofmonth);
        }
        else
        {
            printformat("%d, ",dayofmonth);
        }
    
        // year
        if(year>69)
        {
            printformat("19%d ",year);
        }
        else
        {
            if(year<10)
            {
                printformat("200%d ",year);
            }
            else
            {
                printformat("20%d ",year);
            }
        }
    
        // time
        if(hour<10)
        {
            printformat("0%d:",hour);
        }
        else
        {
            printformat("%d:",hour);
        }
        if(minutes<10)
        {
            printformat("0%d:",minutes);
        }
        else
        {
            printformat("%d:",minutes);
        }
        if(seconds<10)
        {
            printformat("0%d ",seconds);
        }
        else
        {
            printformat("%d ",seconds);
        }
    }
    

    Stand Rev. 25


  • Mod

    uint8_t PackedBCD2Decimal(uint8_t PackedBCDVal)
    {
         return ((PackedBCDVal >> 4) * 10 + (PackedBCDVal & 0xF));
    }
    

    Umwandlung von gepacktem BCD (2 Nibbles) in 8-Bit-Unsigned-Integer


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