• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 82 subscribers
  • Views 706 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SPI TMS320F240 bit stream length

Maria Perdomo
Prodigy 230 points


Hallo,

Im using a the SPI  of the TMS320F240 as slave. I use it as slave and i would like to read the bit stream that a external Master sends to the TMS320F240

As a Test Pattern, the external Master sends 0x123456789ABCDEF. This is a bit stream of 60Bits (15 Bytes7.5 Bytes), at 1.14MBitps, After each bit stream there is a small Pause of ca 9microseconds.

The bit stream, looks like this (with zoom for each 12 Bites):

123

456

789

ABC

DEF

Should it be a problem for the SPI TMS320F240  to read this stream, as it is an 8 Bit Peripheral? Is it possible to receive this string? and then with software distribute in 8 Bit Variables?

Thank you for your Help!

  • 0 in reply to Maria Perdomo
    TI__Genius 15260 points

    Maria,

    There aren't many people who are still familiar with this device as it is very old and is being discontinued.  

    I am very familiar with our SPI which followed this one.  Based on that, I would not expect there to be any problems.  My thought is you would just have to read the data after each 8 bits to prevent it from being lost.  However, I do not have any experience with this peripheral.  I would recommend giving it a try as this will probably be faster than waiting on an answer from us.

    Kris

  • 0 in reply to Kris Parrent
    Prodigy 230 points

    Thank you Kris,

    Yes, I've been traying for a while.  The TMS320F240 is part of a development board, which didnt give to much information about it. As the only acces is through funtions developed specifically for this development board and a I got recurrent errors, since im beginner, i just wanted to understand the meaning of "8 Bit Peripheral" and discard the possibility that the error were due to the lenght of the transmision (60 bits much more than 8 Bits). For  a moment i thought there should be a pause every 8 Bits, but as i read your post. I see the master the transmition can be this long (60 bits without pause) and the information will be received as long as it is read every 8 Bits. so the Pause is not necessary and i can focus to search an other causes of the errors.

    Thank you

    Maria

  • 0 in reply to Maria Perdomo
    TI__Genius 15260 points

    Maria,

    If you haven't looked at this already, I would recommend checking out the documentation we have available for the F240 SPI:

    http://www.ti.com/lit/ug/spru161d/spru161d.pdf

    Good luck!

    Kris