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Is this data rate realistic?

Michael57009
Prodigy 20 points
Other Parts Discussed in Thread: MSP430F2274, TUSB3410

Hi all,

Before I get too invested in the ez430-rf2500 platform, I'd like to determine if it will handle my application.  I'd like to have an end device which samples three analog channels at about 1kHz and reads two digital channels at about the same rate.  I'd like this to be transmitted to my access point and read over the usb-serial emulator.

The msp430f2274 is clocked at 16MHz, so I assume the sampling and digital I/O won't be a problem, but from what I gather the platform only supports 9600 baud, which at 1.2kB/s is going to choke.

Am I wrong on the maximum data rate of 9600 baud?  Should I put two end devices in parallel to get the throughput I want?  Basically, is there anything I have missed in my considerations, and do you think my application is possible on this platform?

Thanks much,

Michael

  • 0
    TI__Mastermind 24315 points

    Hi Michael,

    Yes, the baud rate of the EZ430U is limited to 9600 baud. See this thread for the discussion.

  • 0 in reply to Brandon08
    Prodigy 20 points

    Brandon,

    Thanks for the good link.

    At this early stage of my project's development, it seems that I can get around this limitation most easily by using a commercial rs232-to-usb converter cable or module. On the thread you linked, Brandon Azbell (a different account of yours, by any chance?) mentioned that the UART signals from target board to ez430u are on pins 1 and 6, which I verified in the ez430-rf2500 docs.  Does the use of a commercial converter from rs232 to usb, utilizing only the TX, RX, and GND connections on the rs232 side, make sense as a development-stage workaround of this 9600 baud limitation?  For the finished product something like the TUSB3410 could be used, but I'd like to start working on the application as soon as possible.

    Thanks,

    Michael

  • 0 in reply to Michael57009
    Guru 17650 points

    Hi Michael,

    add an TUSB3410 or an FTDI chip (i.e. FT232x) to your design and you're done! No 9.6kBaud limitation anymore!

    If you need an 'off the shelf solution' for prototyping buy one one these tiny little breakouts: http://www.sparkfun.com/commerce/product_info.php?products_id=718

    Rgds
    aBUGSworstnightmare

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