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Altera_Forum's avatar
Altera_Forum
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11 years ago

HSMC GPIO Daughter card.

I have a question regarding the gpio-hstc card (http://www.terasic.com.tw/cgi-bin/page/archive.pl?language=english&categoryno=67&no=322&partno=1). I'd like to use this board to expand the gpio of my DE2-115 dev. board. In the documentation it states that the HSMC connector pins are connected to GPIO pins. Am I correct in thinking that there is no need for a driver in my design? Meaning I can just map a HSMC pin as if it is a GPIO pin, or do I need to do something more.

If you have any tips regarding the use of the board, I'd like to hear them as well.

18 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    Yes, you are correct. This adapter map HSMC pins only. Not need to have special driver

  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    thank you. I'll try to remember to post any tips I might think of when I have finished this project.

  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    Well I had a lot of other stuff to get working before I managed to do something with this adapter. But found that I had trouble when using the HSMC_TX_D_P[9?]. This is assigned to the same pin as nCEO. I remember reading something about this but I could not remember the solution. After about 30 minutes I remembered having a similar problem with another board once (I beleve it was the DE2-70) where a pin was configured as a programming pin.

    So for others who encounter this and immediately search this forum:

    1. Go to Assignments->Device->Device and Pin Options...

    2. Open menu Dual-Purpose Pins

    3. Set nCEO from "Use as programming pin" to "Use as regular I/O".
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    For others who would like to use this adapter, I will give my pin assignments file and the pinout I got from Terasic. I still have one problem, the HSMC_RX_D_N(15) is always high. If I have figured out why, I will post this as well.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    Hi there,

    Thanks for sharing the tips with others. I had the same problem when I built a new project from scratch for the first time.

    Could you upload your project or send it to our support mail at support@terasic.com ? We'd like to take a look and see what's going on here.

    David from Terasic
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    @David, I will send you a mail in a couple of days. Is there other info you will need?

    [edit]

    Do you also need all the VHDL files, or is just the project enough?

    If you want the vhdl code I can setup an example.
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    Hi there,

    If it's alright with you, a complete project would be nice.

    I would like to get started by compiling the project here. I'll keep you posted if we need any other info.

    Thanks,

    David from Terasic
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    I have setup a quick test which has the same problem. It is always 2.12/2.11 volts whithout attaching any load, just a multimeter. Attached is the project and the sof file for a DE2-115 board with the Daughter card. I know the coding might not be as it should, but it is something I have quickly set up.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    I am beginningn to think we need to start a new thread about the pin voltage. I just found out that HSMC_TX_D_p(16) gives 2,38V when high, and HSMC_RX_D_p(15) provides 2,42V. This seems to be a small difference, but I use these two pins (among other pairs with similar problems) to control a motor[controller], and then it transmits a PWM signal, and the difference becomes a problem. The motor does turn one way, but not the other. Any suggestions? Should I change the jumper to select another IO standard, this might make the difference proportionally smaller, but the main problem still exists.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    @David, Do you know some workaround? I have done all other things on my project for now, and really need the extra IO in order to continue.