Texas DSP 2812 and McBSP

Digital Signal Processing

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  • 1. Motion estimation in MATLAB
    Dear all, I want to test my motion estimation algorithm againest other popularly known ME algos. I have my algorithm code in MATLAB. How can I get the other ME algorithms in MATLAB. If you know any links...please send to me. Thanks in advance, Regards, Ramya.
  • 2. New Question (was GPS Navigation for Ship - Single Receiver or Multiple Receivers?)
    Actually it is a DOA and beamforming problem. We already have a geostationary satellite with exactly known position. This satellite is broadcasting a beacon signal. We need to receive the beacon using an antenna array installed on board. Due to the GPS resolution limitation as well as the ship's minor displacement from the GPS measured position, we need to search the satellite beacon within a very small region. My question is: 1) Is a DOA estimation necessary in this case? Since the searching region should be very small, maybe +/-0.5degree, I don't know whether the existed subspace-based DOA methods, such as MUSIC and ESPRIT, can have such a super resolution and achieve a good estimation of the beacon coming direction. 2) If we do adaptive beamforming directly without DOA process, how to get the true location of the signal source? Thanks. XXXX@XXXXX.COM (Yan.L) wrote in message news:< XXXX@XXXXX.COM >... > Is one GPS receiver enough to get the precise position? Or we need to > use multiple GPS receivers, for instance, four GPS receivers installed > on bow, tail, port and starboard, respectively? > > If we use four GPS receivers, how to manipulate the GPS information > collected by these four receivers to get the precise position of the > ship?
  • 3. old paper, smith .j.i
    Hello, Did a search on newsgroup and websearch and nothing turned up. And the closest newgroup that showed some discussion was this. I am looking for the paper Smith, J.I., "A Computer Generated Multipath fading simulator for mobile radio", IEEE Transactions on Vehicular Technology, Vol. VT-24, No.3, pp 39-40, August 1975 And wondering where I can get it, or which book does refer to this paper. Thanks roger
  • 4. testing
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    I'm attempting to create a FIR pre-emphasis filter. Here's the criteria: sampling frequency = ~100KHz pre-emphasis curve = 75uS from 0 to 15KHz. As little gain as possible from 15KHz above. I think the application is obvious ;) I have a FIR filter design on my desk which does an excellent job of pre-emphasis as well as attenuation after 15kHz - however, the filter was designed for a different sampling frequency (75KHz) and it was designed using an obscure filter design program by someone I have no contact information for. So I know it's possible, but I don't know how. Methods I've tried so far to replicate this design include.. - ifft+window; the preemphasis curve is distorted too much unless I use an obscene # of taps. - using Matlab's remez() function, called with a bunch of segments calculated from the ideal pre-emphasis curve. Hours of playing with segment weights still produces results that aren't that great. Really, the shape of the pre-emphasis curve isn't *that* different from an inverse sinc (CIC compensation) filter so I'm hoping the same kind of techniques can be used to design them; however I'm struggling to find any good online literature on the design of these. Any hints/suggestions/other ideas from anyone? Thanks! - Gary Marsh, XXXX@XXXXX.COM

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
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I can see that my ISRs are working if I set the interrupt flags in PIEIFR6
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I use the internal sample rate generator, and I can see the frame and clock
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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
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I am traceing the C of the example "sw_prioritized_interrupts"
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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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