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PS SPI Pmod JE7 Hardware system

Former Member

Hello everyone,

I'm in the process of interfacing my Avnet CC3000-Pmod Compatible Wi-Fi Adapter to the ZedBoard via the JE7 Pmod header, which is connected to the PS.

At first I thought this should be a simple thing, since creating a hardware system that includes SPI was so simple, but ...

When I try to use the SPI device (via the SpiPs device driver), I am stuck in the XSpiPs_PolledTransfer() function, waiting for the status register flag that indicates the transmission has finished (XSPIPS_IXR_TXOW_MASK). The reason that the flag never comes, is that I read nonsense values from the register (a 0x2 in this case).
Then I added the XSpiPs_SelfTest() function, which failed at the very first register read. So I'm guessing there is something wrong with my hardware design.

I got the Zynq IP setup & configured as follows:

  +--------------------------------+
  |         ZYNQ               DDR +-----> DDR
  |                       FIXED_IO +-----> FIXED_IO
  |                       USBIND_0 +-
-+ TTC0_CLK0_IN         M_AXI_GP0 +-
-+ TTC0_CLK1_IN    TTC0_WAVE0_OUT +-
-+ TTC0_CLK2_IN    TTC0_WAVE1_OUT +-
+-+ M_AXI_GP0_ACLK  TTC0_WAVE2_OUT +-
| |                      FCLK_CLK0 +--+
| |                  FCLK_RESET0_N +- |
| +--------------------------------+  |
+-------------------------------------+

SPI 1: MIO 10 .. 15
SS[1] IO MIO 14
SPI 1 MIO 10 mosi
SPI 1 MIO 11 miso
SPI 1 MIO 12 sclk
SPI 1 MIO 14 ss[1]

The clock is set to ca. 16MHz, which is the maximum the CC3000 can take.

Has anybody had any experience with the CC3000 Adapter, Pmod or SPI on the ZedBoard? I'd be very glad for any help, since I'm pretty much stuck here.

With best regards,
Darius

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    When looking at several Pmods I have with the Maxim peripheral kit, I was surprised to see no standard for the SPI pins (or I2C pins) on the PMODs. The only pins that seem to be standard are power (Vcc on pins 6 and 12) and ground (pins 5 and 11)

    As such, I took a quick look at the pins and matching them between the FPGA and schematics for the JE Pmod, the only one that connects directly to the PS through the MIO.

    From the MIO pin SPI pin links, schematic for the FPGA on the Zedboard, and schematic for the CC3000-Pmod, I get the following:

    CC3000 Pmod pin; JE pin; FPGA pin; MIO Pin using SP1
      SPI_CS  ; JE1  ; A6  ; PS_MIO13 ; ss0
      SPI_DI  ; JE2  ; G7  ; PS_MIO10 ; mosi
      SPI_DO  ; JE3  ; B4  ; PS_MIO11 ; miso
      SPI_CLK ; JE4  ; C5  ; PS_MIO12 ; ck
      SPI_IRQ ; JE7  ; G6  ; PS_MIO0  ; ???

    So it looks like the IRQ needs to be connected to PS_MIO0, which isn't a normal SPI pin, and only listed as a cs1. I see in XPS that MIO0 can be mapped as a GPIO, and maybe it can connect that way? Or maybe you can find another way to map it to the IRQ directly in the MIO setup.

    Personally, I'd use one of the PL Pmods that I can wire the way I want using the EMIO. But maybe you can figure out this last pin?

    -Larry

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  • 0

    When looking at several Pmods I have with the Maxim peripheral kit, I was surprised to see no standard for the SPI pins (or I2C pins) on the PMODs. The only pins that seem to be standard are power (Vcc on pins 6 and 12) and ground (pins 5 and 11)

    As such, I took a quick look at the pins and matching them between the FPGA and schematics for the JE Pmod, the only one that connects directly to the PS through the MIO.

    From the MIO pin SPI pin links, schematic for the FPGA on the Zedboard, and schematic for the CC3000-Pmod, I get the following:

    CC3000 Pmod pin; JE pin; FPGA pin; MIO Pin using SP1
      SPI_CS  ; JE1  ; A6  ; PS_MIO13 ; ss0
      SPI_DI  ; JE2  ; G7  ; PS_MIO10 ; mosi
      SPI_DO  ; JE3  ; B4  ; PS_MIO11 ; miso
      SPI_CLK ; JE4  ; C5  ; PS_MIO12 ; ck
      SPI_IRQ ; JE7  ; G6  ; PS_MIO0  ; ???

    So it looks like the IRQ needs to be connected to PS_MIO0, which isn't a normal SPI pin, and only listed as a cs1. I see in XPS that MIO0 can be mapped as a GPIO, and maybe it can connect that way? Or maybe you can find another way to map it to the IRQ directly in the MIO setup.

    Personally, I'd use one of the PL Pmods that I can wire the way I want using the EMIO. But maybe you can figure out this last pin?

    -Larry

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