Texas DSP 2812 and McBSP

Digital Signal Processing

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  • 1. RS decoding
    I m in the process to implement the RS decoder. I implemented syndrome calculation, berlekamp massey algorithm, chien search and forney algorithms. However, in my code the number of error locations from the chien searc is always less than the degree of the error location polynomial obtaine using berlekamp massey algorithm. They are never equal. I found a metho of testing the berlekamp massey algorithm. It is available in IEE transactions on consumer electronics. The title of the paper i 'architecture of a high speed reed solomon decoder by tetsuo lwaki. I implemented the method in this paper, the output of the berlekam massey algorithm is the same as the output from the method is this paper. Fro this comparison I assumed that the berlekamp massey is working fine However, the degree of the error locator polynomial is always greater tha the number of error locations obtained by chien search. Please guide m whether this is normal. If not then what should I do. I am using chie search for (204,188,8) rs decoder with generator polynomial (x+lambda^0)(x+lambda^1).......(x+lambda^15) and primitive poynomial x^ + x^4 +x^3 +x^2 +1 Regards, Zahid
  • 2. do you use any software for managing DSP courses and interaction among students - like moodle or similar ?
    Hi, I'd be happy to hear any experiences (success/failure stories) about using SW to manage DSP courses (for instance moodle or similar)... What features are particularly desired to ease commuincation with students, exposing educational materials, etc... ? Also if you have online course, where I could learn from, please let us know... Thanks in advance, regards, Rob.
  • 3. Acoustic Beamformer
    Hello, I need to find an acoustic sensor (microphone) array layout with th following properties: [- digital signal processing] - steerable to any directions (azimuth angle, elevation angle) with th help of complex weighting, - frequency invariant between 16 Hz and 20 kHz or at least 500 Hz to 1 kHz, - it should include the sensor directivity. Questions: ---------- 1. Which literature or sites can be recommended to solve this task? 2. Which algorithm should be used to get a mostly frecuency invarian beampattern? -> band-pass filter + compensate the delays of sensors? 3. How many frequency bins should I use for this frequency band and wha are the frequency band sizes for each bin? -> Eeach octave? 4. Which sensor layout has the best performance, without getting symetri mirroring of main lobes? -> Spherical? I am thankfull for every help. Ragards Patrick
  • 4. ADC card for 70 MHz IF
    Hi all I want to receive 70 MHz PM+BPSK modulated signal. Video bandwidth:138 kHz Modulation index for PM: 1.2 radian Subcarrier frequency of BPSK:65536 Hz. I have been using Matlab /Simulink and TMS320C6713 DSK. 1. I need suitable ADC daughtercard for C6713 DSK. 2. What is the sampling rate according to this spec.s? How can I calculate? I want to proof my calculation method. 3. These spec.s are for "satellite telemetry receiver". And also, I want to design "telecommand transmitter" for various spec.s of them: wider bandwidth higer data rates etc. Would you like to suggest me a set (DSK,ADC card, EVM...) which can be useful for all types of applications?
  • 5. A question about filtering
    I want to apply some FIR filter, causal or noncausal to a time series. The begining and ending of the time series cannot be filtered. For example, if I use a symmetric noncausal FIR filter with length 21, then the first 10 samples and last 10 samples is not filtered. For my application, These un-filtered samples cannot be deleted and I want their statistics to be the same as the filtered samples. Is there any solution?

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
Examples".

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
Bell

3.own api flashing dsp 2812

Hello,
I work on  a 2812 dsp board, I make a c# application to test it and now 
want to flash it.

On this board i have four Dsp (not interconnected), i use SDFlash wit
four com port and four sdp project.

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
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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
enslavment of a signal.
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
there's a lot of noise on it.
Can someone explain me why this measure is so noisy and how i coul
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5.DSP-2812: Calling SCI_BOOT from the program

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
a way that it ignores the hardware and boots from SCI_BOOT anyway.

Kind regards, Frank

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7. ADC using 2812

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