PGA2310 and Basic Stamp not responding

[Xlrator]

I have a PGA2310 Stereo Audio Volume Control socketed on a perfboard and connected to my Basic Stamp 2 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 this method:

volume_1 = %00011001 'channels step #25
LOW 7
PAUSE 10
SHIFTOUT 6, 5, MSBFIRST, [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.

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, [volume_1\16]
PAUSE 10
HIGH 7
PAUSE 2000

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

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

LOOP

[paulb]

Can you get access to a digital scope? It's always nice to see the bits coming out.

[Xlrator]

I don't have a scope, but is there PC software that can do that?

[Xlrator]

I had a bad pad on cheap RatShack board. Those things get loose with the slightest amount of heat. It was shorting out when it was in it's housing. It is working alright, now. Just have to figure out to get it to step with my rotary encoder.

BTW, I am interested if anyone has a reccomendation for a DIY PC oscilliscope.

[ALBQ]

Xlrator,
At a glance, the code segments and timing look correct. My first though would be to make sure you have everything connected correctly. You can do this by eye and by extending the delay times in your code, you can check the signals using a meter. See attached thread for a working example. If still problems, private mail me and I will help.
Good luck -ALBQ

DIY Remote Control for Everyone

gillespie147 (at) comcast (dot) net

[jackinnj]

one thing which the Stamp (or the BX24, or PICs like the PIC 16F84) likes is to NOT allowing any of the data pins to float, and for noise reasons, it is wise to decouple the data lines (Clock, Chip Enable and SDO) with resistors. I have used 10k resistor arrays for this.

Instead of the value MSBFIRST try using the numeric 1.

Have you used the deboogger to look at the data lines -- interesting D*E*B*U*G is a prohibo in DIYAUDIOLAND

since you don't have a scope, you can attach a 270R resistor to a LED on each of the data lines and make sure that they are doing what they are supposed to be doing -- just insert PAUSE 250 statements.

also -- devices like ADC's DAC's and digital pots can be a bit squirrely on wiring and deocupling and groundplanes -- make sure that the power pins on the PGA2310 are decoupled with 100nF ceramic caps.