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luligar

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  1. Like
    luligar got a reaction from mgh in Tiva TM4C GPIO pins with "two logic-high states"   
    Hi mgh,
     
    It is indeed an amazing board, specially for the price! Shortly before your reply, I was sifting through these forums and I saw a thread about the 0 Ohm resistors you mentioned. I went back to the flyer and they show the pin pairs that are shorted in the signals diagram, but the resistors themselves, as R9, R10, were not mentioned. Sure enough, I took them out and one of my boards had its PD1 pin taken out , I guess after I tried using the stronger current drivers . On my second board, to my surprise, all 4 pins were fine!
     
    I don't see how to close an issue, if that is even intented in this forum. But I consider it closed and solved. Thanks for your quick and kind reply!
     
    Regards,
    Luis
  2. Like
    luligar reacted to L.R.A in Noob question: enabling interrupts with TivaWare APIs?   
    Fun fact:
    If you do GPIOIntRegister (or other PeripheralIntRegister I belive) it also does
            //     // Enable the GPIO interrupt.     //     IntEnable(ui32Int);


    So it actually enables the interrupt

    I always used GPIOIntRegister instead of default handlers and saw other codes using the IntEnable. But I never needed and didn't know why  
    This is why
  3. Like
    luligar reacted to mgh in Tiva TM4C GPIO pins with "two logic-high states"   
    It's a great little board, isn't it!  :-)
     
    In the little flyer that came with the board, on the spread that shows the header pin functions, you'll find that PD0 and PB6 are connected together. Similarly, PD1 and PB7 are also connected together. It's my understanding that this was done for backward compatibility with the older 43oh booster boards (or something like that). So, we can't drive both pins of those pairs at the same time.
     
    The user guide for the board is spmu296.pdf, full title "Tiva C Series TM4C123G LaunchPad Evaluation Board User's Guide".
    The schematic is in the back, and shows those pins connected together.
     
    Valvano's site has a video showing the removal of the two zero-ohm resistors; it was easy to do.
    This is his video link page:  http://users.ece.utexas.edu/%7Evalvano/Volume1/E-Book/VideoLinks.htm
    Here's one link http://youtu.be/MWIX7wgS9PM
    And the other: https://s3.amazonaws.com/edx-course-videos/ut-embedsys/UTXUT601T114-G018400_100.mp4
     
    Have fun!
  4. Like
    luligar got a reaction from roadrunner84 in Tiva TM4C GPIO pins with "two logic-high states"   
    Hi mgh,
     
    It is indeed an amazing board, specially for the price! Shortly before your reply, I was sifting through these forums and I saw a thread about the 0 Ohm resistors you mentioned. I went back to the flyer and they show the pin pairs that are shorted in the signals diagram, but the resistors themselves, as R9, R10, were not mentioned. Sure enough, I took them out and one of my boards had its PD1 pin taken out , I guess after I tried using the stronger current drivers . On my second board, to my surprise, all 4 pins were fine!
     
    I don't see how to close an issue, if that is even intented in this forum. But I consider it closed and solved. Thanks for your quick and kind reply!
     
    Regards,
    Luis
  5. Like
    luligar got a reaction from bluehash in Tiva TM4C GPIO pins with "two logic-high states"   
    Hi mgh,
     
    It is indeed an amazing board, specially for the price! Shortly before your reply, I was sifting through these forums and I saw a thread about the 0 Ohm resistors you mentioned. I went back to the flyer and they show the pin pairs that are shorted in the signals diagram, but the resistors themselves, as R9, R10, were not mentioned. Sure enough, I took them out and one of my boards had its PD1 pin taken out , I guess after I tried using the stronger current drivers . On my second board, to my surprise, all 4 pins were fine!
     
    I don't see how to close an issue, if that is even intented in this forum. But I consider it closed and solved. Thanks for your quick and kind reply!
     
    Regards,
    Luis
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