## is there someone having 2812's UCOS SOURCE CODE?

Digital Signal Processing

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• 1. UART on EMIF ? (C6000)
Hi, I would like to know if it's possible to interface an UART on TMS320C6713 EMIF port. The UART has 8-bits address and 8-bit data. (It's a 8-channels UART) The EMIF port is for external memory, but UART could be maybe assimilable. Thanks Max
• 2. Solving 4x4 linear system using fixed-point math
I have to solve a 4x4 linear system of equations using fixed-point math. Does anyone one know the most efficient way to do this? Straight matrix inversion obviously isn't the way to go. I stumbled on the following quote in an old Group post... "What is the size of the matrix u are trying to invert. If it is less than 5, we can hardcode all the adjoints in terms of 2 X 2 determinants. If the matrix size of more than 4, i won't recommend Gaussian Elimination. Try some LU or LDU or QR, which will be better in fixed point." ...but I need more information, and I can't track down the gentleman who wrote it. Thanks in advance, Seward
• 3. ADSP-218x SPORT0 Tx trouble
Hello, I have a setup where an ADSP-2188N is connected to an audio codec which acts as master (the codec), generating bclk0, tfs0, rfs0, and of course dr0. These signals seem to be ok with an o'scope. I configured SPORT0 as follows: - multichannel disabled. - tfs and rfs required. - tfs and rfs external. - 16 bit data. - external clock. - normal framing. - non-inverted framing. I set IMASK to 0x020 to enable SPORT0 Rx interrupts and SYSCON = SYSCON | 0x1000 to enable SPORT0. I also set an ISR for SPORT0 Rx interrupt servicing. On it, I just do this: toggle fl1; ax0 = rx0; tx0 = ax0; rti; So, this is a very simple talktrough program. With an o'scope, I can see the fl1 pin toggling at the same rate as the rfs0 signal as expected, which indicates that the interrupt is being serviced. tfs0 is the same signal as rfs0, and is being generated by the codec. however, I see no data at all coming out the dt0 pin, still see data in the dr0 pin... I also changd to: toggle fl1; ax0 = rx0; tx0 = 0x7F; rti; expecting to see some signals out the dt0 pin, but still the same: nothing. Something weird is the fact that while the program is not runnig, the framing signals rise upto 3.3V as normal, but when the program runs, that signal preserves its shape and timing but with amplitude of around 0.8V. Why? Has anyone experienced problems like mine? Any hints are very appreciated. Regards, JaaC
• 4. Help with flashburn utility
Hi, I need some help using the flash burn utility for DSK6713. I've followed all steps upto creating a .cdd file. After that I eraze flash and burn it. When I close CCS and disconnect the USB from the board and press reset, it doent run. Any suggestions? Also could anyone tell me how to find out the memory used for my project/program. Thanks in advance! Manasa

### is there someone having 2812's UCOS SOURCE CODE?

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```Hi,

I was asked to do some research on this "hamming code" and compare its
efficiency with huffman coding? But i remember from my class and
context
book, hamming code is some kind of error correction channel coding
scheme.
As I right? if yes, how can I compare the efficiency of a channel
coding to source coding? I have already thrown away all my knowledge
from classroom.

Thanks
```

```Hi,
I am trying to setup a 2812 to take A to D readings. I have the ADC
and to branch to the ADC interrupt at the EOS (end of sequence). When
the program branches to the interrupt routine, I read and store the
result registers to variables. My problem is that the result registers
never change their value even when I vary the applied signal between 0V
and 3V. Any suggestions? Also, I have the ADC set to suspend mode0
where an emulation suspend is ignored (i.e. the ADC continues to sample
even when I hit a breakpoint?). Would this have anything to do with it?
Alex

```

```Hello !
Would someone be able to explain me how to calculate the execution time o
a
NOP instruction when it is executed into flash and into external ram of
DSP
TI 2812?
Is it normal to have a time more important (2*) into ram than into flas
?
Is it normal to see that a change into the configuration of XINTF doesn'

change the execution time ?

```

```Hi all,

This is regarding flashing a code in 2812 processor from TI. I tried
flashing a sample code from spectrum digital using the SDFlash
utility. I was able to flash it a couple of times, but after that it
was consistently showing errors in flashing. Actually the probelm was
with locking and unlocking the device using CSM.

The important point to be noted as far as flashing is concerned is
that the device has to be reset once ( soft reset thru the SDFlash
utility ) and then flashed, but not the reverse. In case u accidently
reset the device after flashing, it places 0000 in all the password
locations and locks the device permanently and after that ur device
cannot be debugged or reprogrammed. In case u r using an eZDSP kit
continue working with onchip and off chip RAM, but secure RAM