• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 361 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.

TM4C gpio mode configuration Problem

Krishnan G Nair
Expert 1235 points

Hello,

I am attaching two files ,one of GPIO configuration and 2nd one an image on oscilloscope after address and data.

Why two read enable signals are coming and address is coming with delay,is it problem in configuration or some other thing please replay,

Our actual requirement is  to read 1500 bytes in 250 us... from FPGA.....is it possible in gpmode with out dma.

Regards,

KrishnanCTI_NODE1_4_EPI.C

  • 0
    Guru 20670 points
    Hi Krishnan,

    I have no idea what I am looking at. What are the sources of the signals I'm seeing on the scope? (remember to tell me which color is which).
    Could you also provide more information about what you are trying to achieve in this test?

    1500bytes in 250ns? You know at 120Mhz, 250ns is just about 31 cycles? Even if you get 32bits at a time that's like 46 transfers. I doubt that you can get more than 1 transfer per clock cycle so I doubt you can even achieve your requirement with DMA.
  • 0 in reply to Luis Afonso
    Guru 47900 points

    Luis Afonso said:
    have no idea what I am looking at.

    Indeed - poster sets no records for clarity and/or great detail in posting.

    I'd hazard the (bit) educated guess that the top (blue) trace is his, "Read Enable" (as it blips twice - which he mentions.)

    Suspect the bottom (yellow) represents "address" although it may be an address latch and/or control signal.

    Posters inclusion of "FPGA" and exclusion of most other (helpful - perhaps necessary) "other" data confounds...