Texas DSP 2812 and McBSP

Digital Signal Processing

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  • 1. fastest cyclic convolution algorithm
    Hello everyone: First of all, thanks to all those who have posted before and for savin the archives. As you know this is my first post here. I searched th archives by terms and by circular convolution but did not find anything hope I didn't miss a post. You see, I'm trying to implement a paralle cyclic convolution algorithm and was wondering if someone can point ou the fastest cyclic convolution algorithm available for a composite length that is N=R*S where both R and S can also be composite integers. I know w can use the FFT as: x cconv h =invFFT{ FFT(x) .* FFT(h) } but is there anything else. I'm planning to use typical lengths but wil increase it as much as I can. Any help will be appreciated, thanks Ivan
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    Hello, I have no idea how to interpret my results of Amplitude Spectrum calculation correctly: Here is what I have done: I read in AudioSamples from Mono 16Bit 22050Hz File and normalize it to [-1,1] Then I use fftw to make a forward realFFT and calculate the Amplitude Spectrum with sqrt(re * re + im * im); Or should it be "sqrt(re * re + im * im) / number FFT points;" ? What is more, I do not know what is the possible minimum and maximum value which could be expected when calculating the amplitude spectrum (I want to plot the spectrogram and therefore I need to find the proper min/max values for the axis). Due to the function written above I achieve values like 0.182323 and I do not know how to interpret that result. The power spectrum shows power at each frequency line. Which value stands for minimal power and which for maximum power? Converting to Logarithmic Units: You use the formula 20* log10( Amp/AmpReference ) to convert Amplitude Spectrum to decibel ratio. Which value does AmpReference have? Thanks in advance, Michael
  • 3. About spectrum of speech and fax transmission
    hi all, Someone please tell me why the spectrum of speech rolls off towards the higher frequencies ?????? I am a newbie to DSP so, simple terms please as far as possible. I am hoping to use this fact to distinguish it from other data transmissions such as fax. (this was suggested to me by Mr.Vladimir Vassilevsky on Comp.DSP only) Yes Mr. John I am thankful to u also for ur reply. I am trying to read about ITU-T T.30 protocol but could not find a good enough source online Mr.John had suggested using the two tone (frequency) handshake between tw fax machines as a way of identifying fax transmissions. All ideas are welcome and appreciated.
  • 4. Cell Processor
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  • 5. I'm new here and need an important advice
    Hello, I'm looking for a DSP card with following features: -price below 1000 USD -input bitrate about 1Mbit/s -at least 200Mflops -support for floating point math Can somebody help me? Thank you!

Texas DSP 2812 and McBSP

Postby Torgeir Jakobsen » Thu, 02 Dec 2004 02:40:47 GMT

Hi all DSP experts :-)

I have a problem with the McBSP receive interrupt on the 2812 DSP from
Texas. Do anyone have working code on this DSP ?
I have done much the same as on the 5510 DSP where I did not have this
problem, so I do not understand why it is not working here ?

Thanks in advance.

Torgeir



Re: Texas DSP 2812 and McBSP

Postby Brad Griffis » Thu, 02 Dec 2004 10:44:32 GMT

There are more things you need to enable to get interrupts on the 2812 than 
there are on the 5510.  Are you sure that you have enabled the PIE, set the 
proper bit in the PIEIER for the McBSP interrupt, acknowledged the PIE 
(PIEACK), set the corresponding IER bit, and cleared the INTM bit?

Also, are you sure that you have configured the McBSP to generate a receive 
interrupt?  Are you seeing the RRDY flag which indicates there is data in 
the McBSP to be read?

Brad








Re: Texas DSP 2812 and McBSP

Postby Torgeir Jakobsen » Thu, 02 Dec 2004 18:55:30 GMT

Thank you Brad,

I have done the things you describe:
- Enabled PIE
- Set PIEIER for McBSP receive interrupt
- Acknowledged the PIE
- Set IER
- Cleared INTM.

First it looked like RRDY was not set, but now the RRDY is set. I have also
enabled the transmit interrupt to see if this was working better.  I can see
that RRDY and XRDY is set but the PIEIFR register (and PIEACK) does not flag
any interrupt, even if McBSP is set to generate interrupt on RRDY and XRDY
and the PIEIER is set to enable both interrupts.
I am using the sample rate generator, and the clock and frame signals are
generated correctly (measured with oscilloscope).

Any suggestions ?






than
the
receive






Similar Threads:

1.McBSP interrupts on Texas 2812

I have problems with the receive and transmit interrupts on this DSP. I have
set the McBSP to generate interrupts on RRDY and XRDY, and I can see that
these bits are set when I emulate the program on my hardware (using XDS510PP
Plus and CCS). This should also have activated the corresponding interrupt
flags in the PIEIFR6 regsiter (bit 5 and 6), but this does not happen.
I can see that my ISRs are working if I set the interrupt flags in PIEIFR6
manually, so the problem is the connection between the McBSP and the PIEIFR6
register. What do I have to do to make the McBSP RRDY and XRDY activate the
flags in PIEIFR6 ?
I use the internal sample rate generator, and I can see the frame and clock
signals with my oscilloscope.

Thank you in advance.

2.hwo to set up interrupt in dsp 2812

Hi everyone!
I am new in using dsp 2812.

I want to make an T3PINT interrupt.

I just read "TMS320x281x DSP System Control and Interrupts Reference
Guide"(spru078e) and
"TMS320x281x DSP Event Manager (EV) Reference Guide"(spru065e),

On page 84 in spru065e,and on page 122 in spru078e,
what's mentioned in the priority field seems different.
Why?

I am traceing the C of the example "sw_prioritized_interrupts"
mentioned in the document "C281x C/C++ Header Files and Peripheral
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It seems that cpu branchs to ISR to setup priority.Is this the way it
does? Or Is my understanding wrong?
(FILE:   DSP281x_SWPiroritizedPieVect.c)

If priority can be set in code,why priority are mentioned in these
document?

Dose someone know how to accomplish this task?

Thanks a lot for your answers
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3.own api flashing dsp 2812

Hello,
I work on  a 2812 dsp board, I make a c# application to test it and now 
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On this board i have four Dsp (not interconnected), i use SDFlash wit
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I can create a process which will launch four SDFlash.
Does SdFlash can take arguments in a command line, like this ?
\SdFlash clientprjCom1.sdp
...
\SdFlash clientprjCom4.sdp

An other idea is to create my own window working like SDFlash.
In this case, do you know if it's possible to have SDFlash source code
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A last question, does it exist an industrial method to flash more fastly
several dsp.

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4.ADC's noise on DSP 2812

Hi everybody !!!

Can someone help me to solve the following problem ?
I need to use an external signal in my program in order to make a goo
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So what, i want to get a very accurate value of my external signal.
I use the ADC module of the DSP 2812 but when I look a the value returne
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Can someone explain me why this measure is so noisy and how i coul
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Hi All,

I want to call SCI_BOOT in my program in order to use SDFlash to update
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flash and I don't want to change that. Or can the DSP-resetted in such
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Kind regards, Frank

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