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DChau5's avatar
DChau5
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7 years ago

I2C connecting

Hi everyone, I am a newbie in FPGA-SoC field so forgive me if I ask a silly question. So, after successfully programming first bare-metal application ( just blink the LEDs, not much ) on my Atlas-S...
  • DChau5's avatar
    DChau5
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    7 years ago

    Hi el.ign,

    Thanks for you reply. I see that we can route them to FPGA domain. But I also want to know if can we access directly HPS pins without going to FPGA? As I check the schematic of Atlas-SoC board, the I2C1 is connect to LTC header while I2C0 is connected to Accelerometer and no way to access I2C0 externally. That's why I try to access I2C1 by modifying it in Qsys and connect it with jumper on LTC header.

    Can I do it as I said? Do I miss something or do I understand things in a wrong way? Or else, I will try to route it to FPGA at the end but I would like to if there is any others ways ( I'm learning ).

    By the way, thank you for the answer Mr. el.ign. You have answered almost every questions I made and I really appreciate that.

    • EBERLAZARE_I_Intel's avatar
      EBERLAZARE_I_Intel
      Icon for Regular Contributor rankRegular Contributor
      7 years ago

      Hi,

      You mention about the Intel pinout file, can you share to me which is it?

      I'm pretty sure according to the Atlas-SoC user manual the HPS I2C0 for SCL and SDA are as C18 and A19 respectively. Have you tried to assign this before you changing them to C19 and B16?

    • DChau5's avatar
      DChau5
      Icon for New Contributor rankNew Contributor
      7 years ago

      Hi,

      Here is the pinout file I use:

      https://www.intel.com/content/dam/altera-www/global/en_US/pdfs/literature/dp/cyclone-v/5csema4.pdf

      Now I'm trying to use I2C1, this is in my Pin Planner:

      According to the provided schematic from manufacturer, I use I2C1 because it is out to LTC header and from there I can connect it with jumper:

      Those pins in circle are I2C1_SDA and I2C1_SCL on LTC header:

      And for your question, I tried with C18 and A19 then I found out that they are connected to Accelerometer and I don't think I can connect to external slave device using jumper. Therefore, I changed to I2C1 because, yeah, it's connected to LTC header.

    • DChau5's avatar
      DChau5
      Icon for New Contributor rankNew Contributor
      7 years ago

      Ok, after making above description, I think I realize that I made dumb things. I will try to figure out it first and comeback.

      My apology.