I need a 'float' because I have to display a voltage for example of =
41.5V.

The following part of my program show=B4s the A/D- conversion and the
mathematic operations that I need (a voltage range  of 0-5V form the =
A/D-
result is conform to voltage range of 0-50V)


void ermittleDigitalenWert()
{
        digitalwert =3D 0;=20
        digitaleAnzeige =3D 0;
        spannungsZehner =3D 0;
        spannungsEiner =3D 0;
        spannungsKomma =3D 0;
        stromZehner =3D 0;
        stromEiner =3D 0;
        stromKomma =3D 0;
        anzeigeSpannung =3D 0;
        anzeigeStrom =3D 0;
=09
        digitalwert =3D ADRESH;
        digitalwert |=3D (digitalwert << 8);
        digitalwert |=3D ADRESL;
        digitaleAnzeige =3D (float)(digitalwert * 5 / 1023.0);  =09
        ADRESH =3D 0;
        ADRESL =3D 0;
}


void main(void)
{
        init();
        InitLCD();
=09
        while(1)
        {
                if(anzeigeAD =3D=3D TRUE)
                {
                        /************************A/D- Wandlung auf Kanal
0********************/
                        /*********************Spannung der ersten
Halbbruecke*****************/
                        ADCON0 =3D 0b10000001;
                        ADGO =3D 1;
                        while(ADGO =3D=3D 1);
                        ermittleDigitalenWert();

                        spannung_HB1 =3D (digitaleAnzeige * 60.94) / 6.04;
                        DelayS(1);
                =09
                        /************************A/D- Wandlung auf Kanal
1********************/
                        /********************Spannung der zweiten
Halbbruecke*****************/
                        ADCON0 =3D 0b10001001;
                        ADGO =3D 1;
                        while(ADGO =3D=3D 1);
                        ermittleDigitalenWert();
                        spannung_HB2 =3D (digitaleAnzeige * 60.94) / 6.04;
                =09
                        if(spannung_HB2 > spannung_HB1)
                        {
                                anzeigeSpannung =3D spannung_HB2 -
spannung_HB1;
                                spannungPositiv =3D FALSE;
                        }
                        else
                        {=09
                                anzeigeSpannung =3D spannung_HB1 -
spannung_HB2;
                                spannungPositiv =3D TRUE;
                        }
                        anzeigeSpannung =3D spannung_HB1;
                        spannungsZehner =3D (unsigned char)(anzeigeSpannung /
10);
                        spannungsEiner =3D (unsigned char)(anzeigeSpannung -
(spannungsZehner * 10));
                        spannungsKomma =3D (unsigned char)((anzeigeSpannung -
(spannungsZehner * 10)
=09
- spannungsEiner) * 10);
        =09
=09
/****************************Spannungsanzeige*************************/
                        WriteInstrToLCD(Set_DDRAM_Address + 0x42);
                        WriteCharToLCD(' ');
                =09
                        if(spannungPositiv =3D=3D TRUE)
                        {
                                WriteCharToLCD('+');
                        }
                        else
                        {
                                WriteCharToLCD('-');
                        }

                        WriteCharToLCD(0x30 + spannungsZehner);
                        WriteCharToLCD(0x30 + spannungsEiner);
                        WriteCharToLCD('.');
                        WriteCharToLCD(0x30 + spannungsKomma);
                        spannung_HB1 =3D 0;
                        spannung_HB2 =3D 0;
                        DelayS(1);
                                        =09

-----Urspr=FCngliche Nachricht-----
Von: Rick Regan [mailto:rdrdr2k@YAHOO.COM]
Gesendet: Donnerstag, 8. Mai 2003 17:09
An: PICLIST@MITVMA.MIT.EDU
Betreff: Re: AW: AW: [PIC]:Floating point


> No, that4s not the problem.....after the A/D-
> conversion I make a type cast
> from "integer" to "float". And if I try to show at
> first the value of the
> variable "voltage_HB1" on the display and then the
> value of "voltage_HB2",
> then I get the right values for both A/D- channels.

Since A/D results are integer, could you explain
why you need to make them 'float' to compare
and display them?


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