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ARM Equivalents To C2000

Jacob Putz
Intellectual 665 points
Other Parts Discussed in Thread: TMS320F28335, TMS320C28346, ADS62P25

Are there any equivalent MCUs for the TMS320C28346 and/or TMS320F28335 in the ARM series?

I am attempting to interface with the following in as near real time as possible:

Sample an ADS62P25 at as near full speed as possible
Output 24 Bits of data to a 480X272 TFT LCD at 9.2MHz

The following will also need to be interfaced with but on an as needed basis:

Store sampled values to FLASH memory via SPI
Control frequency output of Clock Generator (initial configuration at startup)
Control frequency output of Waveform generator (Analog AD9853) via SPI
Control amplitude of waveform generator by digital potentiometer (Maxim MAX5481) via SPI
Configure ADS62P25 via SPI
Control Scaling and Coupling of Analog Front End (Solid State Relays and 2:4 Multiplexers)
Sample battery voltage

Please note, inorder to get multiple SPI devices on one bus, I am utilizing a 1:8 Multiplexer as well for the chip select.

  • 0
    TI__Mastermind 22025 points

    Enforcer,

    Sounds like you're building a software defined radio of some sort...

    To achieve the speeds you are talking about with the ADC you'll need something beefier than a C2000.  I would recommend you take a look at the Sitara devices  if you are set on ARM or C6000 if you are OK with using a proprietary core.  These should have the speed and interfaces you need to talk to the ADC and DAC.  I'm not really an expert on those so I can't really comment beyond that.  I would recommend you ask in their forums about your application.

    Regards,

    Trey

  • 0 in reply to Trey German289
    Intellectual 665 points


    Sounds like you're building a software defined radio of some sort...

    Haha, actually an oscilloscope.

    I was thinking I would need to use a Sitara device and started looking at some.  Thank  you for the help.

    Enforcer

  • 0 in reply to Jacob Putz
    TI__Mastermind 22025 points

    That was actually my first guess, but the fact you were also driving a QPSK DAC made me think SDR.  Good luck with the project!  Curious if this is personal or commercial?  I've thought about doing an android USB scope for a while, but never had the stones to actually undertake the project.  I think it'd be super cool to be able to pinch zoom on a waveform...

  • 0 in reply to Trey German289
    Intellectual 665 points

    I can't take all the credit.  I am merely doing a redesign of an existing product on ebay by removing the FPGA (never understood their use), upgrading the processor, upgrading the ADC, upgrading to an external DAC vice internal MCU DAC, and some additional tweaks (bigger LCD) to both make it interface properly and use more comercially available parts.  The AFE is the same up to the final amplifier that gives me a differential signal at the ADC and most of the power supply is the same.

    When I find a schematic of something online I am interested in, I like to figure out how it works, and then if I can think of an improvement, start redesigning the schematic around the improvement.

    I actually thought about implementing a touchscreen but as I dug deeper, I discovered I didn't understand it as well, so I discarded it.  With that interest, I may consider doing so again.

    I was actually doing it as a personal project but if I got enough interest, and after checking for international patents and other varied legal issues, may offer it up as a DIY kit with some of the more difficult parts already on the circuit board at cost for the chips, board manufacture, and part placing.

  • 0 in reply to Jacob Putz
    TI__Mastermind 22025 points

    That sounds like a really cool project.  When I looked at doing a scope the AFE was one of the things that scared me off.  Kudos to your for finding a schematic.  Which scope were you able to find schematics of?

    My big idea was to simply build the data acquisition part of a scope and transfer data over high speed USB to an android host of some sort (phone or tablet) and let android take care of the heavy lifting when it comes to displaying the data.  This cuts hardware costs and gives you the power of well proven UI platform.  While there are some "toy" scopes like this for the iPad they are nothing close to a professional scope like you'd get from Tek or Agilient.  Can't wait for someone to actually productize this concept.

    FYI, TI Deals has one of the Sitara eval kits for half off:

    http://www.tideals.com/

    Good Luck with your endeavour!

  • 0 in reply to Trey German289
    Intellectual 665 points

    The DSO203, click below.  It is made in china by some unknown firm, as far as I know.

    http://www.ebay.com/itm/160709683320?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

    In concept it looks like it should work and the reviews of it are pretty good.  For $200, I'll try it out.  Can always return it if it doesn't work.

    Your idea shouldn't be too hard to do either, just remove LCD, run the ADC slower so it doesn't overload the USB link, will still need an MCU to packetize the data, though. In concept my project has all the building blocks, which means all it would need is a firmware change and an app to interpret the data.  Developing that app, however, is not something I would know how to do.  Programming the firmware for an integrated system is going to be hard enough for me as it is (this one not exactly a programmer).  I could design hardware all day but ask me to develope some piece of complex code and I am a fish out of water. :)