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Hi Dana
I try to use usbfs_audio example project
I didn't hear any voice in my speaker (I try the speaker in another project and the speaker works well)
I use a speaker with 8 ohm impadence and psoc 3.0 creator
How can I make it work?
second question: what is the best option to stream audio file from computer to Psoc -5 and to back to pc?
Thanks
Solved! Go to Solution.
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PSoC 5LP
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PSOC cannot drive a 3.2 ohm speaker directly, your output, if
you get any, would be severly distorted at minimum. If you place
a series R of a few hundred ohms between speaker and PGA out
you might be able to hear something. I would also recommend you
clamp pin to its rails with somethinmg that looks like this -
There is a possibility you damaged the PSOC GPIO pin, PGA,
due to L effects from speaker by a direct connection to it. Disconnect
speaker and look at PGA output to see if audio looks "OK".
Better yet get a power amp to drive speaker, here are a zillion possi-
bilities -
The venerable LM386 – http://www.ti.com/product/lm386
http://www.ti.com/lsds/ti/audio-ic/audio-operational-amplifier-product.page?familyAliasId=1200585
Regards, Dana.
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PSOC cannot drive a 3.2 ohm speaker directly, your output, if
you get any, would be severly distorted at minimum. If you place
a series R of a few hundred ohms between speaker and PGA out
you might be able to hear something. I would also recommend you
clamp pin to its rails with somethinmg that looks like this -
There is a possibility you damaged the PSOC GPIO pin, PGA,
due to L effects from speaker by a direct connection to it. Disconnect
speaker and look at PGA output to see if audio looks "OK".
Better yet get a power amp to drive speaker, here are a zillion possi-
bilities -
The venerable LM386 – http://www.ti.com/product/lm386
http://www.ti.com/lsds/ti/audio-ic/audio-operational-amplifier-product.page?familyAliasId=1200585
Regards, Dana.
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Thanks a lit Dana!!
I wil try it 🙂
The goal of my project is to stream a recorded file to the psoc then to filter it with the psoc and to get back the filtered file to the computer then to analyse it.
Do you know a way to pass a audio file using usb isochronous transfer and ( I tried example usbfs) and I cant figure out how much packets can i pass between the pc and psoc5 total?
I saw that i can pass txt files (64bytes)and it works well but not in the Isochronous transfer( which i think i need) it passes only part of the information of the file(half or less) what can I do in order to pass 10-20MB .wav file?
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I will try what you suggestet , Thanks a lot!
I tried to connect the V_ref to gnd, 3.3( external) and Vss internal, but with no success...
By the way What do you suggest about passing the audio file from the PC to psoc and back?
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Not sure if these would help -
http://www.cypress.com/?rID=70131 AN82072 - PSoC® 3 and PSoC 5LP USB General Data Transfer with Standard HID Drivers
http://www.cypress.com/?rID=39553 AN56377 - PSoC® 3 and PSoC 5LP - Introduction to Implementing USB Data Transfers
http://www.cypress.com/?rID=39404 AN57473 - USB HID Basics with PSoC® 3 and PSoC 5LP
http://www.cypress.com/?rID=39327 AN57294 - USB 101: An Introduction to Universal Serial Bus 2.0
http://www.cypress.com/?rID=40103 AN58726 - PSoC® 3 / PSoC 5LP USB HID Intermediate (with Keyboard and Composite Device)
Regards, Dana.
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Speaker drive like this -
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Try this project. It has a lot of excess - part can be removed.
To test you can probably use the generators, creation for the sound cards.
A lot of them on the Internet. I use my, he is on this page.
But note that in most cases the signal my be be distorted integrated filter PC.
Pay attention to the draft Project # 102 - USB Audio using the PSoC 5L
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You can test your speaker by using wavedac component, just sub it for your
VDAC -
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Just noticed: in your project is not PGA_1_Start();
)))))
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Hi Dana,
thanks a lot:)
I am not sure I did it well
I connectred the components as you said and did Start() to the components( Opamp_1_Start();
PGA_Inv_1_Start();
WaveDAC8_1_Start();)
but it tells me 7 Errors -- M0012 mismatching type
attaches schematic of the project
whatwould you suggest me?
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To post a complete project use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.
The API names for the components start with the component names, so in your case it is PGA_1_Start() and not
PGA_Inv_1_Start().
Bob
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The Wavedac of course gets replaced by your VDAC8 after you have
tested your speaker lashup.
The differential drive to speaker yields 4 X the drive power of single ended
speaker drive.
Regards, Dana.
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Thanks!
No errors at all but unfortunately it still doesnt work for me...
i followed the instructions to connect to p1[7] and Gnd but in the USBFS_AUDIO.cydwrfile I see Speaker_1 -p0[0] and Speaker_2- p0[1]
I tried to connect to those pins but didnt work as well
shoud I change the output pins there?
Best regards,
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Nothing wrong perhaps you have little experience.
You can set the desired contacts if you open the file USBFS_AUDIO01.cydwr and click on
the arrow to the right of column "port".
Note: in your example uses P0.0 And P0.1
In the project I suggested above, I am using P3.6 And P3.7
By the way, an opamp and PGA_Inv have very different output parameters. I suggest using the same - an opamp.
It is possible in Windows, you will need to announce your device as the default device.
In this case, you can use the audio player PC.
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Hyorica!! It work.
Thanks!!
I connected the speaker to P0[0] and vadj and play with the R11 and it's work well
Thanks a lot!!
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"By the way, an opamp and PGA_Inv have very different output parameters. I suggest using the same - an opamp."
Yes and no. They both use the same basic OpAmp with its attendant phase and magnitude
response. They will exhibit different GBW closed loop for same G, and different Rin, Rout. However
at G = 1, - 1, the effects on Rout relative to load virtually irrelevant for this application for todays high
Aol devices. Same for GBW.
Zocl ~= Zool / Ab, so for both cases essentially closed loop output Zocl is = open loop output Zool / loop
gain.
Any good text book has this analysis of Inv vs Ninv response and how they effectively degenerate
to equivalent closed loop performance at low G, this type of application being considered. The foundation
book is Burr Brown, Graeme, Toby, and Huelsman. Analog devices, LTC have ap notes delving into
these basic topics.
"They both use the same basic OpAmp", my statement above, that may not be the case,
I am filing an inquiry with Cypress to determine that.
Regards, Dana.
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In this project I am only interested in the output current.
For Opamp i see:
DC and AC Electrical Characteristics for PSoC 5LP:
IOUT =10mA
for PGA it does not have.
In any case, I would prefer a symmetry with respect to the speaker.
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"In any case, I would prefer a symmetry with respect to the speaker."
Are you concerned with Cass A operation of the speaker ?
There is an issue I missed, the OpAmps in the SC blocks may not be the same
as in the PGA, although when they are operated at unity G they should be OK for
driving Speaker differentially.
I am going to file a CASE to see just how different they are in terms of GBW, Aol,
Slew, and Ro / Drive.
In the worst case just use 2 OpAmps or 2 PGA's to be absolutely sure speaker
drive becomes true differential. That way you will get 4X the power out of the speaker.
If yoiu could care less about speaker volume, drive it single ended, save 1 OpAmp or PGA.
Regards, Dana.
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Hi,
someone knows how to connect a microphone for the ADC_Filter_DAC example?should I amplify it physically or it is enough to use the internal opamp?
Best regards,
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It depends on type of mic it is, ceramic, magnetic, capacitive,
and whether or not it has internal signal conditioning already built
in.
You most certainly can use internal OpAmp / PGA for that. But you have
to bias properly for each of the types.
Regards, Dana.
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Previous circuit does not show any of the necessary biasing, and
its gain fairly low. Just Google "electret microphone circuit opamp"
and you will get plenty of hits, like this one -
You probably do not need the output cap C3, and replace R2, R3 with Creator
reference Vdd/2 in analog component section. The LM358 becomes internal
OpAmp. You could possibly use the PGA to do this, getting rid of R4, R5 as well.
Regards, Dana.
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Thanks Dana.
I trying to do it, hope it will work.
Best regards