PGA2310 and BS2 help

Xlrator

I have a PGA2310 Stereo Audio Volume Control socketed on a perfboard and connected to my HomeworkBoard according to the datasheet, but I still cannot get any response from it. With the code below I am trying to send straight binary to it. 16 bits, the first 8 for Right channel and last 8 for Left channel. I also tried the sending the 8 bits seperately.

volume_1 = %00011001 'channels step #25
LOW 7
PAUSE 10
SHIFTOUT 6, 5, MSBFIRST, [noparse][[/noparse]volume_1\8,volume_1\8]
PAUSE 10
HIGH 7

Should it work this way or am I misunderstanding something? Or do I need to check my perfboard for the 50th time?

The datasheet can be found here: focus.ti.com/docs/prod/folders/print/pga2310.html#technicaldocuments

' {$STAMP BS2}
' {$PBASIC 2.5}

volume_1    VAR    Word
volume_2    VAR    Word
volume_3    VAR    Word

DIRL = %11100000

DO
    volume_1 = %0001100100011001    'both channels step #25
    LOW 7
    PAUSE 10
    SHIFTOUT 6, 5, MSBFIRST, [noparse][[/noparse]volume_1\16]
    PAUSE 10
    HIGH 7
    PAUSE 2000

    volume_2 = %0100101101001011    'both channels step #75
    LOW 7
    PAUSE 10
    SHIFTOUT 6, 5, MSBFIRST, [noparse][[/noparse]volume_2\16]
    PAUSE 10
    HIGH 7
    PAUSE 2000

    volume_3 = %0110010001100100    'both channels step #100
    LOW 7
    PAUSE 10
    SHIFTOUT 6, 5, MSBFIRST, [noparse][[/noparse]volume_3\16]
    PAUSE 10
    HIGH 7
    PAUSE 2000

LOOP

Chris Savage

I have one of these audio chips but have not yet had time to mess around with it.· If you do not find an answer by this weekend reply again and I will hook it up and see what I can come up with.

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Chris Savage
Parallax Tech Support
csavage@parallax.com

bjhamltn

I've used this chip before, your code looks correct, the problem may be the circuit.
Do you have the chip in upside down? And how are you connectiong the +VA and -VA of the chip?
And if you are uisng electrolitic capacitors make sure they aren't in backwards.

Heres is some code that I used

'{$STAMP BS2e}
'{$PBASIC 2.5}
'{$PORT COM1}
'------------------Constants--------------------
   ZCEN         PIN      15          'zero crossing active high
   CS           PIN      14          'chip select active low
   SDI          PIN      13          'serial data input
   SCLK         PIN      10          'serial clock input
   Mute         PIN      8           'mute active low
   zero         CON      0
   '----------------Variables----------------------
   Channel      VAR      Word
   right        VAR      channel.HIGHBYTE
   left         VAR      channel.LOWBYTE
   '-----------------PROGRAM-----------------------
Startup:
HIGH ZCEN
HIGH MUTE
HIGH CS
   DEBUG CLS,
   "ch_R>>.........        ", CR,
   "ch_L>>.........        ", CR
    '-----------------PROGRAM-----------------------
Main:
   LOW CS
   right= 6     'can be set from 0 TO 255
   left=  6     'can be set from 0 TO 255
   SHIFTOUT SDI, SCLK, MSBFIRST,[noparse][[/noparse]Channel/16]
   HIGH CS
   DEBUG CRSRXY, 15, 3,
   DEC right, CLREOL,
   CRSRXY, 15, 4,
   DEC left, CLREOL, CRSRX ,0

Xlrator

Thanks for confirming the code. That helped me locate the loose pad on the perfboard that shorted out when the board & wires were pressed in it's housing.

Now it's time to work with the rotary encoder!!

Chris Savage

Rotary Encoder code examples were listed in the following thread.· Take care.

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Chris Savage
Parallax Tech Support
csavage@parallax.com