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> I will take a look at the dsPIC family, I need it for audio stuff so
> that is probably the way to go

Currently using this

http://home.clear.net.nz/pages/joecolquitt/DAC_amp_schematic.gif

http://home.clear.net.nz/pages/joecolquitt/DAC_amp_pcb.gif

with 44100Hz data from an SDHC card

Very happy with the sound quality (using the mute function
of the TDA1905 would prevent the odd pop and click)

Set-up

;16.000000 xtal /17 *144 /2 =3D> 33.882352

           mov     #0b0000000000001111,w0
;                     0                     ROI
;                      000                  DOZE
;                         0                 DOZEN
;                          000              FRCDIV (/1)
;                             00            PLLPOST (N2) =3D /2 =3D> 135.52=
9344=20
=3D> 67.764672MHz Fosc
;                               x=20
=3D  33.882336MHz Fcy
;                                01111      PLLPRE (N1) =3D /17, 16MHz =3D>=
=20
0.941176MHz
;                                           FREF input frequency to PFD
           mov     w0,CLKDIV

           mov     #142,w0
;                     xxxxxxxx
;                             mmmmmmmm      PLLDIV =3D (142 + 2) =3D 144 *=
=20
0.941176MHz =3D> 135.529411MHz
           mov     w0,PLLFBD               ;PLL multiplier (M)

           mov     #0b1000000100000000,w0
;                     1                     DACEN (DAC on)
;                      x
;                       0                   DACSIDL
;                        0                  AMPON
;                         xxx
;                            1              FORM (=3D1, signed)
;                             x
;                              -------      DACFDIV

           mov     #12,w1                  ;DACFDIV divider
           dec     w1,w1
           add     w1,w0,w0                ;135.529344MHz / 12 =3D 44117 * =
256
           mov     w0,DAC1CON

;Timer1 interrupt

tosc      =3D 33882336
pload     =3D tosc/44100       ;Timer1 count (668.74) for 44.1kHz 16-bit=20
stereo
                             ;668 =3D 0.1% fast, 669 =3D 0.04% slow

           mov     #pload,w0               ;22.676us interrupt (0.1% fast)
           mov     w0,PR1

During each Timer1 IRQ, 16 bytes are fetch from the card into a 512-
byte buffer ( [W7++] ) and 4 bytes are extracted from another 512-byte
buffer ( [W8++] ). When 512 [W7] DAC bytes have been used, W7
and W8 are swapped

load_dac:  mov     [w8++],w0               ;send 2 words to DAC
           mov     w0,DAC1LDAT
           mov     [w8++],w0
           mov     w0,DAC1RDAT

           dec     ch_cnt                  ;until block of 512 sent
           bra     nz,tst_cmd              ;does CMD17 need to be sent ?

           mov     #128,w0                 ;reset DAC byte counter (128 * 4=
)
           mov     w0,ch_cnt

                                           ;reset buffer addresses
           mov     #ram1,w7                ;RAM1 =3D 0900
           mov     #ram2,w8                ;RAM2 =3D 0b00

           btsc    flags3,#ram_block       ;swap or not
           bra     toggle
           exch    w7,w8                   ;RAM1 =3D 0b00, RAM2 =3D 0900

Attached shows the sequence. Bytes are fetched from the card faster
than the DAC uses them so there are no breaks in playback

Joe=20

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