Texas DSP 2812 and McBSP

Digital Signal Processing

    Sponsored Links

    Next

  • 1. How to change the greyscale intensities to the prescribled mean and standard deviation?
    Hello all, Hope this would be the stupidest question you have ever read. I am very new in image processing. Now I have many 8-bit greyscale images, and I want to set the mean and standard deviation to 0.25 for further processing linearly. Could anyone tell me how to do that? Thanks in advance.
  • 2. Help Understanding - Decimation, Anti-Alias and Accuracy !
    Hi, I have a problem, I have a oversampled (OSR =16) Digital Signal, prior to downsampling a filter is used, a 16 Tap BandpassFIR filter wich also have a Window. 1. Is there a document or approch how to calculate mathematically the resolution / Accuracy after the Filter, the Window and after the Decimation. (Filterquantisation ?) What errrors come from the Window ?? What role does the Window play (The FIR BAndpass is used to fit the signals frequncy to allow downsampling I suppose) But for what use a window ? I would be happy about some help ! Thaks Sascha
  • 3. ADSP 21160M 64 bit DMA to external memory
    Hi I would like to do a DMA to external memory from an ADSP 21160M using all 64 bits of the External Port (ie. nWrh and nWrl should be asserted together). I'm running the EP in asynchronous mode and have set bit 5 of the DMAC register to '0' (to select 32/64 bit data type) and bits 8-6 to "000" (to select no packing). However, only the nWrh strobe seems to be asserted. I don't know whether the DSP is capable of doing 64 bit DMA to external memory, but I can make it do 64 bit reads and writes using the LW mnemonic, as shown in the example below: dm(0x20800010)=r14(LW); (This is despite the following text on pg 5-45 of the Hardware Reference: "External memory space accesses using Normal word addressing and the LW mnemonic perform a 32-bit accesses, not a 64-bit access.") The following text on page 5-46 is rather discouraging... "When looking at Table 5-8, it is important to note that Long and Short word addressing may not target multiprocessor memory space or external memory space." However, I suspect that it just might be possible to do 64 bit DMA's... I just can't figure out how! Any help is much appreciated. Many thanks Sam --
  • 4. Iterative decoding with viterbi decoder
    Hi , i'm trying to do iterative decoding using vitdec from matlab, i would like to know how can i get the metrics of the bits to intruce them in the demodulator again, using the function vitdec. The output of this function is the final sequence , but i just want the metrics of the bits. Thank you TA

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
or informations about c++ input methods that i can call to flash dsp.

A last question, does it exist an industrial method to flash more fastly
several dsp.

thank you for your help.
Laurence




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
improve it ?
Thanks a lot

Laurence

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
the flash. The resistors are set up in such a way that it boots from
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

6. Matlab GUI for coupling TI 2812 DSP with Simulink RTW

7. ADC using 2812

8. flash and external ram timing on TI 2812



Return to Digital Signal Processing

 

Who is online

Users browsing this forum: No registered users and 22 guest