AD9833

[Chipsi]

Zdravim,

nejak jsem asi vypadl ze seznamu prispevatelu, ci co ?

0x000FC00 => 0000 0000 0000 1111 1100 0000 0000

MSB                 00 0000 0011 1111
LSB                  00 0000 0000 0000
Celé                  0000 0000 1111 1100 0000 0000 0000
Takze bych si tipl, ze to je priklad pro 0x00FC000

našel jsem příklad, takže jednoduše, asi je to v manuálu BLBĚ.

#define    MCLK        16384000L        // DDS master clock
#define FDELTA        MCLK/(65536L*4096)    // Frequency increment 
(Master clock / 228)
#define    FREQ_HZ        1048576L * 256 / MCLK    // Phase increment 
corresponding to the f(Hz) frequency

// ** SetFreq    -- the function calculates the phase value
//        corresponding to the specified frequency.
//
unsigned long SetFreq(unsigned f)
    {
    unsigned long    ul = f * (unsigned long)ScaleFct;
    return FREQ_HZ * ul;
    }
//
// ** PutFreq    -- the function loads selected AD9833 frequency register
//        with the appropriate value (Freq0 or Freq1 locations)
//
void PutFreq(char rg)
    {
    unsigned     n;
    unsigned    f;
    unsigned long    p;

    if (rg)        // FREG1 is selected
        {
        n = FREG1_ADR;
        f = Freq1;
        }
    else    {    // FREG0 is selected
        n = FREG0_ADR;
        f = Freq0;
        }
    p = SetFreq(f);                // Convert frequency
    Out9833 (n | (p & 0x3FFF));        // Write LSB half stuff
    Out9833 (n | ((p>>14) & 0x3FFF));    // Write MSB half stuff
    }

Hezky vikend

Chipsi


Šula Miloš napsal(a):
> Zdravim,
> muzete mi nekdo poradit, jak soudruzi v analogu pocitaji 14bit LSB a 14bit MSB z 28bitove hodnoty ?
>
> http://www.analog.com/UploadedFiles/Data_Sheets/AD9833.pdf
> strana 12 tabulka 5.
>
> 28bit hodnotu 0x000FC00 tam prevadi na 14bit LSB 0x0000 a 14bit MSB 0x003F ???
>
> Milos
>   
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